Merge "Add first widget Preference for SPA"

packages/SettingsLib/Spa/.gitignore

@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

packages/SettingsLib/Spa/OWNERS

@@ -0,0 +1,6 @@
+chaohuiw@google.com
+hanxu@google.com
+kellyz@google.com
+pierreqian@google.com
+
+per-file *.xml = set noparent

packages/SettingsLib/Spa/TEST_MAPPING

@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "SpaLibTests"
+    }
+  ]
+}

packages/SettingsLib/Spa/build.gradle

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+buildscript {
+    ext {
+        minSdk_version = 31
+        compose_version = '1.2.0-alpha04'
+        compose_material3_version = '1.0.0-alpha06'
+    }
+}
+plugins {
+    id 'com.android.application' version '7.3.0-beta04' apply false
+    id 'com.android.library' version '7.3.0-beta04' apply false
+    id 'org.jetbrains.kotlin.android' version '1.6.10' apply false
+}

packages/SettingsLib/Spa/codelab/Android.bp

@@ -0,0 +1,33 @@
+//
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package {
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+android_app {
+    name: "SpaLibCodelab",
+
+    srcs: ["src/**/*.kt"],
+
+    static_libs: [
+        "SpaLib",
+        "androidx.compose.runtime_runtime",
+    ],
+    kotlincflags: ["-Xjvm-default=all"],
+    platform_apis: true,
+    min_sdk_version: "31",
+}

packages/SettingsLib/Spa/codelab/AndroidManifest.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2022 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.settingslib.spa.codelab">
+
+    <application
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.SettingsLib.Compose.DayNight">
+        <activity
+            android:name="com.android.settingslib.spa.codelab.MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

packages/SettingsLib/Spa/codelab/build.gradle

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+}
+
+android {
+    namespace 'com.android.settingslib.spa.codelab'
+    compileSdk 33
+
+    defaultConfig {
+        applicationId "com.android.settingslib.spa.codelab"
+        minSdk minSdk_version
+        targetSdk 33
+        versionCode 1
+        versionName "1.0"
+    }
+
+    sourceSets {
+        main {
+            kotlin {
+                srcDir "src"
+            }
+            res.srcDirs = ["res"]
+            manifest.srcFile "AndroidManifest.xml"
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+        freeCompilerArgs = ["-Xjvm-default=all"]
+    }
+    buildFeatures {
+        compose true
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion compose_version
+    }
+    packagingOptions {
+        resources {
+            excludes += '/META-INF/{AL2.0,LGPL2.1}'
+        }
+    }
+}
+
+dependencies {
+    implementation(project(":spa"))
+}

packages/SettingsLib/Spa/codelab/res/values/strings.xml

@@ -0,0 +1,19 @@
+<!--
+  Copyright (C) 2022 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+<resources>
+    <!-- Codelab App name. [DO NOT TRANSLATE] -->
+    <string name="app_name" translatable="false">SpaLib Codelab</string>
+</resources>

packages/SettingsLib/Spa/codelab/src/com/android/settingslib/spa/codelab/HomeScreen.kt

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.codelab
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
+import com.android.settingslib.spa.framework.onClickNavigateTo
+import com.android.settingslib.spa.theme.SettingsDimension
+import com.android.settingslib.spa.theme.SettingsTheme
+import com.android.settingslib.spa.widget.preference.Preference
+import com.android.settingslib.spa.widget.preference.PreferenceModel
+
+@Composable
+fun HomeScreen() {
+    Column {
+        Text(
+            text = stringResource(R.string.app_name),
+            modifier = Modifier.padding(SettingsDimension.itemPadding),
+            color = MaterialTheme.colorScheme.onSurface,
+            style = MaterialTheme.typography.headlineMedium,
+        )
+
+        Preference(object : PreferenceModel {
+            override val title = "Preference"
+            override val onClick: (() -> Unit) = onClickNavigateTo(Destinations.Preference)
+        })
+    }
+}
+
+@Preview(showBackground = true)
+@Composable
+private fun HomeScreenPreview() {
+    SettingsTheme {
+        HomeScreen()
+    }
+}

packages/SettingsLib/Spa/codelab/src/com/android/settingslib/spa/codelab/MainActivity.kt

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.codelab
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import androidx.navigation.compose.rememberNavController
+import com.android.settingslib.spa.framework.localNavController
+import com.android.settingslib.spa.theme.SettingsTheme
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContent {
+            MainContent()
+        }
+    }
+}
+
+object Destinations {
+    const val Home = "Home"
+    const val Preference = "Preference"
+}
+
+@Composable
+private fun MainContent() {
+    SettingsTheme {
+        val navController = rememberNavController()
+        CompositionLocalProvider(navController.localNavController()) {
+            NavHost(
+                navController = navController,
+                startDestination = Destinations.Home,
+            ) {
+                composable(Destinations.Home) { HomeScreen() }
+                composable(Destinations.Preference) { PreferenceCodelab() }
+            }
+        }
+    }
+}

packages/SettingsLib/Spa/codelab/src/com/android/settingslib/spa/codelab/PreferenceCodelab.kt

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.codelab
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
+import com.android.settingslib.spa.framework.toState
+import com.android.settingslib.spa.theme.SettingsTheme
+import com.android.settingslib.spa.widget.preference.Preference
+import com.android.settingslib.spa.widget.preference.PreferenceModel
+import kotlinx.coroutines.delay
+
+@Composable
+fun PreferenceCodelab() {
+    Column(Modifier.verticalScroll(rememberScrollState())) {
+        Preference(object : PreferenceModel {
+            override val title = "Preference"
+        })
+
+        Preference(object : PreferenceModel {
+            override val title = "Preference"
+            override val summary = "With summary".toState()
+        })
+
+        Preference(object : PreferenceModel {
+            override val title = "Preference"
+            override val summary = produceState(initialValue = " ") {
+                delay(1000L)
+                value = "Async summary"
+            }
+        })
+
+        var count by remember { mutableStateOf(0) }
+        Preference(object : PreferenceModel {
+            override val title = "Click me"
+            override val summary = derivedStateOf { count.toString() }
+            override val onClick: (() -> Unit) = { count++ }
+        })
+
+        var ticks by remember { mutableStateOf(0) }
+        LaunchedEffect(ticks) {
+            delay(1000L)
+            ticks++
+        }
+        Preference(object : PreferenceModel {
+            override val title = "Ticker"
+            override val summary = derivedStateOf { ticks.toString() }
+        })
+
+        Preference(object : PreferenceModel {
+            override val title = "Disabled"
+            override val summary = "Disabled".toState()
+            override val enabled = false.toState()
+        })
+    }
+}
+
+@Preview(showBackground = true)
+@Composable
+private fun PreferenceCodelabPreview() {
+    SettingsTheme {
+        PreferenceCodelab()
+    }
+}

packages/SettingsLib/Spa/gradle.properties

@@ -0,0 +1,39 @@
+#
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true

packages/SettingsLib/Spa/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,22 @@
+#
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+#Thu Jul 14 10:36:06 CST 2022
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME

packages/SettingsLib/Spa/gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

packages/SettingsLib/Spa/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

packages/SettingsLib/Spa/settings.gradle

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+rootProject.name = "SpaLib"
+include ':spa'
+include ':codelab'
+include ':tests'

packages/SettingsLib/Spa/spa/Android.bp

@@ -0,0 +1,36 @@
+//
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package {
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+android_library {
+    name: "SpaLib",
+
+    srcs: ["src/**/*.kt"],
+
+    static_libs: [
+        "androidx.compose.material3_material3",
+        "androidx.compose.material_material-icons-extended",
+        "androidx.compose.runtime_runtime",
+        "androidx.compose.ui_ui-tooling-preview",
+        "androidx.navigation_navigation-compose",
+        "com.google.android.material_material",
+    ],
+    kotlincflags: ["-Xjvm-default=all"],
+    min_sdk_version: "31",
+}

packages/SettingsLib/Spa/spa/AndroidManifest.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  Copyright (C) 2022 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<manifest package="com.android.settingslib.spa" />

packages/SettingsLib/Spa/spa/build.gradle

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+    id 'com.android.library'
+    id 'kotlin-android'
+}
+
+android {
+    namespace 'com.android.settingslib.spa'
+    compileSdk 33
+
+    defaultConfig {
+        minSdk minSdk_version
+        targetSdk 33
+    }
+
+    sourceSets {
+        main {
+            kotlin {
+                srcDir "src"
+            }
+            res.srcDirs = ["res"]
+            manifest.srcFile "AndroidManifest.xml"
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+        freeCompilerArgs = ["-Xjvm-default=all"]
+    }
+    buildFeatures {
+        compose true
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion compose_version
+    }
+    packagingOptions {
+        resources {
+            excludes += '/META-INF/{AL2.0,LGPL2.1}'
+        }
+    }
+}
+
+dependencies {
+    api "androidx.compose.material3:material3:$compose_material3_version"
+    api "androidx.compose.material:material-icons-extended:$compose_version"
+    api "androidx.compose.runtime:runtime-livedata:$compose_version"
+    api "androidx.compose.ui:ui-tooling-preview:$compose_version"
+    api 'androidx.navigation:navigation-compose:2.5.0'
+    api 'com.google.android.material:material:1.6.1'
+    debugApi "androidx.compose.ui:ui-tooling:$compose_version"
+}

packages/SettingsLib/Spa/spa/res/values-night/themes.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2022 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+<resources>
+
+    <style name="Theme.SettingsLib.Compose.DayNight" />
+</resources>

packages/SettingsLib/Spa/spa/res/values/themes.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2022 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+<resources>
+
+    <style name="Theme.SettingsLib.Compose" parent="Theme.Material3.DayNight.NoActionBar">
+        <item name="android:statusBarColor">@android:color/transparent</item>
+        <item name="android:navigationBarColor">@android:color/transparent</item>
+    </style>
+
+    <style name="Theme.SettingsLib.Compose.DayNight">
+        <item name="android:windowLightStatusBar">true</item>
+    </style>
+</resources>

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/framework/NavControllerWrapper.kt

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.framework
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.compositionLocalOf
+import androidx.compose.runtime.remember
+import androidx.navigation.NavHostController
+
+interface NavControllerWrapper {
+    fun navigate(route: String)
+    fun navigateUp()
+}
+
+@Composable
+fun NavHostController.localNavController() =
+    LocalNavController provides remember { NavControllerWrapperImpl(this) }
+
+val LocalNavController = compositionLocalOf<NavControllerWrapper> {
+    object : NavControllerWrapper {
+        override fun navigate(route: String) {}
+
+        override fun navigateUp() {}
+    }
+}
+
+@Composable
+fun onClickNavigateTo(route: String): () -> Unit {
+    val navController = LocalNavController.current
+    return { navController.navigate(route) }
+}
+
+internal class NavControllerWrapperImpl(
+    private val navController: NavHostController,
+) : NavControllerWrapper {
+    override fun navigate(route: String) {
+        navController.navigate(route)
+    }
+
+    override fun navigateUp() {
+        navController.navigateUp()
+    }
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/framework/RuntimeUtils.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.framework
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.remember
+
+/**
+ * Remember the [State] initialized with the [this].
+ */
+@Composable
+fun <T> T.toState(): State<T> = remember { stateOf(this) }
+
+/**
+ * Return a new [State] initialized with the passed in [value].
+ */
+fun <T> stateOf(value: T) = object : State<T> {
+    override val value = value
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/theme/MaterialColors.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.theme
+
+import androidx.compose.material3.ColorScheme
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.platform.LocalContext
+
+@Composable
+internal fun materialColorScheme(isDarkTheme: Boolean): ColorScheme {
+    val context = LocalContext.current
+    return remember(isDarkTheme) {
+        when {
+            isDarkTheme -> dynamicDarkColorScheme(context)
+            else -> dynamicLightColorScheme(context)
+        }
+    }
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/theme/SettingsDimension.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.theme
+
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.ui.unit.dp
+
+object SettingsDimension {
+    val itemIconContainerSize = 72.dp
+    val itemPaddingStart = 24.dp
+    val itemPaddingEnd = 16.dp
+    val itemPaddingVertical = 16.dp
+    val itemPadding = PaddingValues(
+        start = itemPaddingStart,
+        top = itemPaddingVertical,
+        end = itemPaddingEnd,
+        bottom = itemPaddingVertical,
+    )
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/theme/SettingsOpacity.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.theme
+
+object SettingsOpacity {
+    const val Full = 1f
+    const val Disabled = 0.38f
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/theme/SettingsTheme.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.theme
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+
+/**
+ * The Material 3 Theme for Settings.
+ */
+@Composable
+fun SettingsTheme(content: @Composable () -> Unit) {
+    val isDarkTheme = isSystemInDarkTheme()
+    val colorScheme = materialColorScheme(isDarkTheme)
+
+    MaterialTheme(colorScheme = colorScheme) {
+        content()
+    }
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/widget/preference/BasePreference.kt

@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.widget.preference
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.BatteryChargingFull
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.Dp
+import com.android.settingslib.spa.framework.toState
+import com.android.settingslib.spa.theme.SettingsDimension
+import com.android.settingslib.spa.theme.SettingsOpacity
+import com.android.settingslib.spa.theme.SettingsTheme
+
+@Composable
+internal fun BasePreference(
+    title: String,
+    summary: State<String>,
+    modifier: Modifier = Modifier,
+    icon: (@Composable () -> Unit)? = null,
+    enabled: State<Boolean> = true.toState(),
+    paddingStart: Dp = SettingsDimension.itemPaddingStart,
+    paddingEnd: Dp = SettingsDimension.itemPaddingEnd,
+    paddingVertical: Dp = SettingsDimension.itemPaddingVertical,
+    widget: @Composable () -> Unit = {},
+) {
+    Row(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(end = paddingEnd),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        val alphaModifier =
+            Modifier.alpha(if (enabled.value) SettingsOpacity.Full else SettingsOpacity.Disabled)
+        if (icon != null) {
+            Box(
+                modifier = alphaModifier.size(SettingsDimension.itemIconContainerSize),
+                contentAlignment = Alignment.Center,
+            ) {
+                icon()
+            }
+        } else {
+            Spacer(modifier = Modifier.width(width = paddingStart))
+        }
+        TitleAndSummary(
+            title = title,
+            summary = summary,
+            modifier = alphaModifier
+                .weight(1f)
+                .padding(vertical = paddingVertical),
+        )
+        widget()
+    }
+}
+
+// Extracts a scope to avoid frequent recompose outside scope.
+@Composable
+private fun TitleAndSummary(title: String, summary: State<String>, modifier: Modifier) {
+    Column(modifier) {
+        Text(
+            text = title,
+            color = MaterialTheme.colorScheme.onSurface,
+            style = MaterialTheme.typography.titleMedium,
+        )
+        if (summary.value.isNotEmpty()) {
+            Text(
+                text = summary.value,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                style = MaterialTheme.typography.bodyMedium,
+            )
+        }
+    }
+}
+
+@Preview
+@Composable
+private fun BasePreferencePreview() {
+    SettingsTheme {
+        BasePreference(
+            title = "Screen Saver",
+            summary = "Clock".toState(),
+        )
+    }
+}
+
+@Preview
+@Composable
+private fun BasePreferenceIconPreview() {
+    SettingsTheme {
+        BasePreference(
+            title = "Screen Saver",
+            summary = "Clock".toState(),
+            icon = {
+                Icon(imageVector = Icons.Outlined.BatteryChargingFull, contentDescription = null)
+            },
+        )
+    }
+}

packages/SettingsLib/Spa/spa/src/com/android/settingslib/spa/widget/preference/Preference.kt

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.widget.preference
+
+import androidx.compose.foundation.clickable
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.ui.Modifier
+import com.android.settingslib.spa.framework.stateOf
+
+/**
+ * The widget model for [Preference] widget.
+ */
+interface PreferenceModel {
+    /**
+     * The title of this [Preference].
+     */
+    val title: String
+
+    /**
+     * The summary of this [Preference].
+     */
+    val summary: State<String>
+        get() = stateOf("")
+
+    /**
+     * Indicates whether this [Preference] is enabled.
+     *
+     * Disabled [Preference] will be displayed in disabled style.
+     */
+    val enabled: State<Boolean>
+        get() = stateOf(true)
+
+    /**
+     * The on click handler of this [Preference].
+     *
+     * This also indicates whether this [Preference] is clickable.
+     */
+    val onClick: (() -> Unit)?
+        get() = null
+}
+
+/**
+ * Preference widget.
+ *
+ * Data is provided through [PreferenceModel].
+ */
+@Composable
+fun Preference(model: PreferenceModel) {
+    val modifier = model.onClick?.let { onClick ->
+        Modifier.clickable(enabled = model.enabled.value) { onClick() }
+    } ?: Modifier
+    BasePreference(
+        title = model.title,
+        summary = model.summary,
+        modifier = modifier,
+        enabled = model.enabled,
+    )
+}

packages/SettingsLib/Spa/tests/Android.bp

@@ -0,0 +1,36 @@
+//
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package {
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+android_test {
+    name: "SpaLibTests",
+    test_suites: ["device-tests"],
+
+    srcs: ["src/**/*.kt"],
+
+    static_libs: [
+        "SpaLib",
+        "androidx.test.runner",
+        "androidx.test.ext.junit",
+        "androidx.compose.runtime_runtime",
+        "androidx.compose.ui_ui-test-junit4",
+        "androidx.compose.ui_ui-test-manifest",
+    ],
+    kotlincflags: ["-Xjvm-default=all"],
+}

packages/SettingsLib/Spa/tests/AndroidManifest.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  Copyright (C) 2022 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.settingslib.spa.tests">
+
+    <application>
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <instrumentation
+        android:name="androidx.test.runner.AndroidJUnitRunner"
+        android:label="Tests for SpaLib"
+        android:targetPackage="com.android.settingslib.spa.tests">
+    </instrumentation>
+</manifest>

packages/SettingsLib/Spa/tests/build.gradle

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+    id 'com.android.library'
+    id 'kotlin-android'
+}
+
+android {
+    namespace 'com.android.settingslib.spa.tests'
+    compileSdk 33
+
+    defaultConfig {
+        minSdk minSdk_version
+        targetSdk 33
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    sourceSets {
+        androidTest {
+            kotlin {
+                srcDir "src"
+            }
+            manifest.srcFile "AndroidManifest.xml"
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+        freeCompilerArgs = ["-Xjvm-default=all"]
+    }
+    buildFeatures {
+        compose true
+    }
+    composeOptions {
+        kotlinCompilerExtensionVersion compose_version
+    }
+    packagingOptions {
+        resources {
+            excludes += '/META-INF/{AL2.0,LGPL2.1}'
+        }
+    }
+}
+
+dependencies {
+    androidTestImplementation(project(":spa"))
+    androidTestImplementation 'androidx.test.ext:junit-ktx:1.1.3'
+    androidTestImplementation("androidx.compose.ui:ui-test-junit4:$compose_version")
+    androidTestDebugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version"
+}

packages/SettingsLib/Spa/tests/src/com/android/settingslib/spa/widget/preference/PreferenceTest.kt

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settingslib.spa.widget.preference
+
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.test.assertIsDisplayed
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.test.onNodeWithText
+import androidx.compose.ui.test.performClick
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.android.settingslib.spa.framework.toState
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class PreferenceTest {
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    @Test
+    fun title_displayed() {
+        composeTestRule.setContent {
+            Preference(object : PreferenceModel {
+                override val title = "Preference"
+            })
+        }
+
+        composeTestRule.onNodeWithText("Preference").assertIsDisplayed()
+    }
+
+    @Test
+    fun click_enabled_withEffect() {
+        composeTestRule.setContent {
+            var count by remember { mutableStateOf(0) }
+            Preference(object : PreferenceModel {
+                override val title = "Preference"
+                override val summary = derivedStateOf { count.toString() }
+                override val onClick: (() -> Unit) = { count++ }
+            })
+        }
+
+        composeTestRule.onNodeWithText("Preference").performClick()
+        composeTestRule.onNodeWithText("1").assertIsDisplayed()
+    }
+
+    @Test
+    fun click_disabled_noEffect() {
+        composeTestRule.setContent {
+            var count by remember { mutableStateOf(0) }
+            Preference(object : PreferenceModel {
+                override val title = "Preference"
+                override val summary = derivedStateOf { count.toString() }
+                override val enabled = false.toState()
+                override val onClick: (() -> Unit) = { count++ }
+            })
+        }
+
+        composeTestRule.onNodeWithText("Preference").performClick()
+        composeTestRule.onNodeWithText("0").assertIsDisplayed()
+    }
+}