Add default AppListModel filter and getSummary

To simply some simple usage case and unit test.

Also add Flow<List<T>>.mapItem(), we could use mapItem() instead of
asyncMapItem() when async is not need.

Bug: 260660819
Test: Make Settings
Change-Id: I958aeaeb8c0e98ee0873b39a958a5ef5158dd76a

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

@@ -26,6 +26,13 @@ import kotlinx.coroutines.flow.distinctUntilChangedBy
 import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.map
 
+/**
+ * Returns a [Flow] whose values are a list which containing the results of applying the given
+ * [transform] function to each element in the original flow's list.
+ */
+inline fun <T, R> Flow<List<T>>.mapItem(crossinline transform: (T) -> R): Flow<List<R>> =
+    map { list -> list.map(transform) }
+
 /**
  * Returns a [Flow] whose values are a list which containing the results of asynchronously applying
  * the given [transform] function to each element in the original flow's list.

packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/AppListModel.kt

@@ -33,7 +33,8 @@ interface AppListModel<T : AppRecord> {
      *
      * @return the [AppRecord] list which will be displayed.
      */
-    fun filter(userIdFlow: Flow<Int>, option: Int, recordListFlow: Flow<List<T>>): Flow<List<T>>
+    fun filter(userIdFlow: Flow<Int>, option: Int, recordListFlow: Flow<List<T>>): Flow<List<T>> =
+        recordListFlow
 
     /**
      * This function is called when the App List's loading is finished and displayed to the user.
@@ -67,5 +68,5 @@ interface AppListModel<T : AppRecord> {
      * @return null if no summary should be displayed.
      */
     @Composable
-    fun getSummary(option: Int, record: T): State<String>?
+    fun getSummary(option: Int, record: T): State<String>? = null
 }

packages/SettingsLib/SpaPrivileged/tests/src/com/android/settingslib/spaprivileged/model/app/AppListViewModelTest.kt

@@ -21,7 +21,7 @@ import android.content.pm.ApplicationInfo
 import androidx.compose.runtime.Composable
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.android.settingslib.spa.framework.compose.stateOf
-import com.android.settingslib.spa.framework.util.asyncMapItem
+import com.android.settingslib.spa.framework.util.mapItem
 import com.android.settingslib.spa.testutils.waitUntil
 import com.google.common.truth.Truth.assertThat
 import kotlinx.coroutines.ExperimentalCoroutinesApi
@@ -116,16 +116,7 @@ private class TestAppListModel : AppListModel<TestAppRecord> {
     var onFirstLoadedCalled = false
 
     override fun transform(userIdFlow: Flow<Int>, appListFlow: Flow<List<ApplicationInfo>>) =
-        appListFlow.asyncMapItem { TestAppRecord(it) }
-
-    @Composable
-    override fun getSummary(option: Int, record: TestAppRecord) = null
-
-    override fun filter(
-        userIdFlow: Flow<Int>,
-        option: Int,
-        recordListFlow: Flow<List<TestAppRecord>>,
-    ) = recordListFlow
+        appListFlow.mapItem(::TestAppRecord)
 
     override suspend fun onFirstLoaded(recordList: List<TestAppRecord>) {
         onFirstLoadedCalled = true

packages/SettingsLib/SpaPrivileged/tests/src/com/android/settingslib/spaprivileged/tests/testutils/TestAppListModel.kt

@@ -17,8 +17,7 @@
 package com.android.settingslib.spaprivileged.tests.testutils
 
 import android.content.pm.ApplicationInfo
-import androidx.compose.runtime.Composable
-import com.android.settingslib.spa.framework.util.asyncMapItem
+import com.android.settingslib.spa.framework.util.mapItem
 import com.android.settingslib.spaprivileged.model.app.AppListModel
 import com.android.settingslib.spaprivileged.model.app.AppRecord
 import kotlinx.coroutines.flow.Flow
@@ -35,16 +34,7 @@ class TestAppListModel(
     override fun getSpinnerOptions() = options
 
     override fun transform(userIdFlow: Flow<Int>, appListFlow: Flow<List<ApplicationInfo>>) =
-        appListFlow.asyncMapItem { TestAppRecord(it) }
-
-    @Composable
-    override fun getSummary(option: Int, record: TestAppRecord) = null
-
-    override fun filter(
-        userIdFlow: Flow<Int>,
-        option: Int,
-        recordListFlow: Flow<List<TestAppRecord>>,
-    ) = recordListFlow
+        appListFlow.mapItem(::TestAppRecord)
 
     override fun getGroupTitle(option: Int, record: TestAppRecord) =
         if (enableGrouping) record.group else null