Rounded corners support, off by default.

Test: runtest systemui
Bug: 33208650
Change-Id: I63e11e36268e277cc1c5e70651fa5248aa8b3fc0

packages/SystemUI/res/drawable/rounded.xml

@@ -0,0 +1,24 @@
+<!--
+    Copyright (C) 2016 The Android Open Source Project
+
+    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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="8dp"
+    android:height="8dp"
+    android:viewportWidth="8"
+    android:viewportHeight="8">
+
+    <path
+        android:fillColor="#000000"
+        android:pathData="M8,0H0v8C0,3.6,3.6,0,8,0z" />
+
+</vector>

packages/SystemUI/res/layout/rounded_corners.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+** Copyright 2012, 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.
+-->
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <ImageView
+        android:id="@+id/left"
+        android:layout_width="12dp"
+        android:layout_height="12dp"
+        android:tint="#ff000000"
+        android:src="@drawable/rounded" />
+    <ImageView
+        android:id="@+id/right"
+        android:layout_width="12dp"
+        android:layout_height="12dp"
+        android:tint="#ff000000"
+        android:layout_gravity="end"
+        android:src="@drawable/rounded" />
+</FrameLayout>

packages/SystemUI/res/values/dimens.xml

@@ -792,4 +792,8 @@
     <dimen name="top_padding">0dp</dimen>
     <dimen name="bottom_padding">48dp</dimen>
     <dimen name="edge_margin">16dp</dimen>
+
+    <dimen name="rounded_corner_radius">0dp</dimen>
+    <dimen name="rounded_corner_content_padding">0dp</dimen>
+
 </resources>

packages/SystemUI/src/com/android/systemui/Dependency.java

@@ -77,6 +77,8 @@ import com.android.systemui.statusbar.policy.UserInfoControllerImpl;
 import com.android.systemui.statusbar.policy.UserSwitcherController;
 import com.android.systemui.statusbar.policy.ZenModeController;
 import com.android.systemui.statusbar.policy.ZenModeControllerImpl;
+import com.android.systemui.tuner.TunablePadding;
+import com.android.systemui.tuner.TunablePadding.TunablePaddingService;
 import com.android.systemui.tuner.TunerService;
 import com.android.systemui.tuner.TunerServiceImpl;
 import com.android.systemui.util.leak.GarbageMonitor;
@@ -268,6 +270,8 @@ public class Dependency extends SystemUI {
 
         mProviders.put(ColorExtractor.class, () -> new ColorExtractor(mContext));
 
+        mProviders.put(TunablePaddingService.class, () -> new TunablePaddingService());
+
         // Put all dependencies above here so the factory can override them if it wants.
         SystemUIFactory.getInstance().injectDependencies(mProviders, mContext);
     }

packages/SystemUI/src/com/android/systemui/RoundedCorners.java

@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2017 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.systemui;
+
+import static com.android.systemui.tuner.TunablePadding.FLAG_START;
+import static com.android.systemui.tuner.TunablePadding.FLAG_END;
+
+import android.app.Fragment;
+import android.graphics.PixelFormat;
+import android.support.annotation.VisibleForTesting;
+import android.util.DisplayMetrics;
+import android.view.Gravity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewGroup.LayoutParams;
+import android.view.WindowManager;
+
+import com.android.systemui.R.id;
+import com.android.systemui.fragments.FragmentHostManager;
+import com.android.systemui.fragments.FragmentHostManager.FragmentListener;
+import com.android.systemui.plugins.qs.QS;
+import com.android.systemui.statusbar.phone.CollapsedStatusBarFragment;
+import com.android.systemui.statusbar.phone.NavigationBarFragment;
+import com.android.systemui.statusbar.phone.StatusBar;
+import com.android.systemui.tuner.TunablePadding;
+import com.android.systemui.tuner.TunerService;
+import com.android.systemui.tuner.TunerService.Tunable;
+
+public class RoundedCorners extends SystemUI implements Tunable {
+    public static final String SIZE = "sysui_rounded_size";
+    public static final String PADDING = "sysui_rounded_content_padding";
+
+    private int mRoundedDefault;
+    private View mOverlay;
+    private View mBottomOverlay;
+    private float mDensity;
+    private TunablePadding mQsPadding;
+    private TunablePadding mStatusBarPadding;
+    private TunablePadding mNavBarPadding;
+
+    @Override
+    public void start() {
+        mRoundedDefault = mContext.getResources().getDimensionPixelSize(
+                R.dimen.rounded_corner_radius);
+        if (mRoundedDefault == 0) {
+            // No rounded corners on this device.
+            return;
+        }
+
+        mOverlay = LayoutInflater.from(mContext)
+                .inflate(R.layout.rounded_corners, null);
+        mOverlay.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
+        mOverlay.findViewById(R.id.right).setRotation(90);
+
+        mContext.getSystemService(WindowManager.class)
+                .addView(mOverlay, getWindowLayoutParams());
+        mBottomOverlay = LayoutInflater.from(mContext)
+                .inflate(R.layout.rounded_corners, null);
+        mBottomOverlay.findViewById(R.id.right).setRotation(180);
+        mBottomOverlay.findViewById(R.id.left).setRotation(270);
+        WindowManager.LayoutParams layoutParams = getWindowLayoutParams();
+        layoutParams.gravity = Gravity.BOTTOM;
+        mContext.getSystemService(WindowManager.class)
+                .addView(mBottomOverlay, layoutParams);
+
+        DisplayMetrics metrics = new DisplayMetrics();
+        mContext.getSystemService(WindowManager.class)
+                .getDefaultDisplay().getMetrics(metrics);
+        mDensity = metrics.density;
+
+        Dependency.get(TunerService.class).addTunable(this, SIZE);
+
+        // Add some padding to all the content near the edge of the screen.
+        int padding = mContext.getResources().getDimensionPixelSize(
+                R.dimen.rounded_corner_content_padding);
+        StatusBar sb = getComponent(StatusBar.class);
+        View statusBar = sb.getStatusBarWindow();
+
+        TunablePadding.addTunablePadding(statusBar.findViewById(R.id.keyguard_header), PADDING,
+                padding, FLAG_END);
+
+        FragmentHostManager.get(sb.getNavigationBarWindow()).addTagListener(
+                NavigationBarFragment.TAG,
+                new TunablePaddingTagListener(padding, 0));
+
+        FragmentHostManager fragmentHostManager = FragmentHostManager.get(statusBar);
+        fragmentHostManager.addTagListener(CollapsedStatusBarFragment.TAG,
+                new TunablePaddingTagListener(padding, R.id.status_bar));
+        fragmentHostManager.addTagListener(QS.TAG,
+                new TunablePaddingTagListener(padding, R.id.header));
+    }
+
+    private WindowManager.LayoutParams getWindowLayoutParams() {
+        final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT,
+                LayoutParams.WRAP_CONTENT,
+                WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL,
+                0
+                    | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
+                    | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
+                    | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
+                    | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH
+                    | WindowManager.LayoutParams.FLAG_SLIPPERY
+                    | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
+                    | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
+                ,
+                PixelFormat.TRANSLUCENT);
+        lp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
+        lp.setTitle("RoundedOverlay");
+        lp.gravity = Gravity.TOP;
+        return lp;
+    }
+
+
+    @Override
+    public void onTuningChanged(String key, String newValue) {
+        if (mOverlay == null) return;
+        if (SIZE.equals(key)) {
+            int size = mRoundedDefault;
+            try {
+                size = (int) (Integer.parseInt(newValue) * mDensity);
+            } catch (Exception e) {
+            }
+            setSize(mOverlay.findViewById(R.id.left), size);
+            setSize(mOverlay.findViewById(R.id.right), size);
+            setSize(mBottomOverlay.findViewById(R.id.left), size);
+            setSize(mBottomOverlay.findViewById(R.id.right), size);
+        }
+    }
+
+    private void setSize(View view, int pixelSize) {
+        LayoutParams params = view.getLayoutParams();
+        params.width = pixelSize;
+        params.height = pixelSize;
+        view.setLayoutParams(params);
+    }
+
+    @VisibleForTesting
+    static class TunablePaddingTagListener implements FragmentListener {
+
+        private final int mPadding;
+        private final int mId;
+        private TunablePadding mTunablePadding;
+
+        public TunablePaddingTagListener(int padding, int id) {
+            mPadding = padding;
+            mId = id;
+        }
+
+        @Override
+        public void onFragmentViewCreated(String tag, Fragment fragment) {
+            if (mTunablePadding != null) {
+                mTunablePadding.destroy();
+            }
+            View view = fragment.getView();
+            if (mId != 0) {
+                view = view.findViewById(mId);
+            }
+            mTunablePadding = TunablePadding.addTunablePadding(view, PADDING, mPadding,
+                    FLAG_START | FLAG_END);
+        }
+    }
+}

packages/SystemUI/src/com/android/systemui/SystemUIApplication.java

@@ -87,6 +87,7 @@ public class SystemUIApplication extends Application implements SysUiServiceProv
             GarbageMonitor.Service.class,
             LatencyTester.class,
             GlobalActionsComponent.class,
+            RoundedCorners.class,
     };
 
     /**

packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java

@@ -94,7 +94,7 @@ import java.util.Locale;
  */
 public class NavigationBarFragment extends Fragment implements Callbacks {
 
-    private static final String TAG = "NavigationBar";
+    public static final String TAG = "NavigationBar";
     private static final boolean DEBUG = false;
     private static final String EXTRA_DISABLE_STATE = "disabled_state";
 

packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

@@ -4632,6 +4632,10 @@ public class StatusBar extends SystemUI implements DemoMode,
         return (mNavigationBar != null ? (NavigationBarView) mNavigationBar.getView() : null);
     }
 
+    public View getNavigationBarWindow() {
+        return mNavigationBarView;
+    }
+
     public KeyguardBottomAreaView getKeyguardBottomAreaView() {
         return mKeyguardBottomArea;
     }

packages/SystemUI/src/com/android/systemui/tuner/TunablePadding.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2017 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.systemui.tuner;
+
+import android.util.DisplayMetrics;
+import android.view.View;
+import android.view.WindowManager;
+
+import com.android.systemui.Dependency;
+import com.android.systemui.tuner.TunerService.Tunable;
+
+/**
+ * Version of Space that can be resized by a tunable setting.
+ */
+public class TunablePadding implements Tunable {
+
+    public static final int FLAG_START = 1;
+    public static final int FLAG_END = 2;
+    public static final int FLAG_TOP = 4;
+    public static final int FLAG_BOTTOM = 8;
+
+    private final int mFlags;
+    private final View mView;
+    private final int mDefaultSize;
+    private final float mDensity;
+
+    private TunablePadding(String key, int def, int flags, View view) {
+        mDefaultSize = def;
+        mFlags = flags;
+        mView = view;
+        DisplayMetrics metrics = new DisplayMetrics();
+        view.getContext().getSystemService(WindowManager.class)
+                .getDefaultDisplay().getMetrics(metrics);
+        mDensity = metrics.density;
+        Dependency.get(TunerService.class).addTunable(this, key);
+    }
+
+    @Override
+    public void onTuningChanged(String key, String newValue) {
+        int dimen = mDefaultSize;
+        if (newValue != null) {
+            dimen = (int) (Integer.parseInt(newValue) * mDensity);
+        }
+        int left = mView.isLayoutRtl() ? FLAG_END : FLAG_START;
+        int right = mView.isLayoutRtl() ? FLAG_START : FLAG_END;
+        mView.setPadding(getPadding(dimen, left), getPadding(dimen, FLAG_TOP),
+                getPadding(dimen, right), getPadding(dimen, FLAG_BOTTOM));
+    }
+
+    private int getPadding(int dimen, int flag) {
+        return ((mFlags & flag) != 0) ? dimen : 0;
+    }
+
+    public void destroy() {
+        Dependency.get(TunerService.class).removeTunable(this);
+    }
+
+    // Exists for easy injecting in tests.
+    public static class TunablePaddingService {
+        public TunablePadding add(View view, String key, int defaultSize, int flags) {
+            if (view == null) {
+                throw new IllegalArgumentException();
+            }
+            return new TunablePadding(key, defaultSize, flags, view);
+        }
+    }
+
+    public static TunablePadding addTunablePadding(View view, String key, int defaultSize,
+            int flags) {
+        return Dependency.get(TunablePaddingService.class).add(view, key, defaultSize, flags);
+    }
+}

packages/SystemUI/tests/src/com/android/systemui/RoundedCornersTest.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2017 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.systemui;
+
+import static com.android.systemui.tuner.TunablePadding.FLAG_END;
+import static com.android.systemui.tuner.TunablePadding.FLAG_START;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.Fragment;
+import android.testing.AndroidTestingRunner;
+import android.view.Display;
+import android.view.View;
+import android.view.WindowManager;
+
+import com.android.systemui.R.dimen;
+import com.android.systemui.RoundedCorners.TunablePaddingTagListener;
+import com.android.systemui.fragments.FragmentHostManager;
+import com.android.systemui.fragments.FragmentService;
+import com.android.systemui.statusbar.phone.StatusBar;
+import com.android.systemui.statusbar.phone.StatusBarWindowView;
+import com.android.systemui.tuner.TunablePadding;
+import com.android.systemui.tuner.TunablePadding.TunablePaddingService;
+import com.android.systemui.tuner.TunerService;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidTestingRunner.class)
+public class RoundedCornersTest extends SysuiTestCase {
+
+    private RoundedCorners mRoundedCorners;
+    private StatusBar mStatusBar;
+    private WindowManager mWindowManager;
+    private FragmentService mFragmentService;
+    private FragmentHostManager mFragmentHostManager;
+    private TunerService mTunerService;
+    private StatusBarWindowView mView;
+    private TunablePaddingService mTunablePaddingService;
+
+    @Before
+    public void setup() {
+        mStatusBar = mock(StatusBar.class);
+        mWindowManager = mock(WindowManager.class);
+        mView = spy(new StatusBarWindowView(mContext, null));
+        when(mStatusBar.getStatusBarWindow()).thenReturn(mView);
+        mContext.putComponent(StatusBar.class, mStatusBar);
+
+        Display display = mContext.getSystemService(WindowManager.class).getDefaultDisplay();
+        when(mWindowManager.getDefaultDisplay()).thenReturn(display);
+        mContext.addMockSystemService(WindowManager.class, mWindowManager);
+
+        mFragmentService = mDependency.injectMockDependency(FragmentService.class);
+        mFragmentHostManager = mock(FragmentHostManager.class);
+        when(mFragmentService.getFragmentHostManager(any())).thenReturn(mFragmentHostManager);
+
+        mTunerService = mDependency.injectMockDependency(TunerService.class);
+
+        mRoundedCorners = new RoundedCorners();
+        mRoundedCorners.mContext = mContext;
+        mRoundedCorners.mComponents = mContext.getComponents();
+
+        mTunablePaddingService = mDependency.injectMockDependency(TunablePaddingService.class);
+    }
+
+    @Test
+    public void testNoRounding() {
+        mContext.getOrCreateTestableResources().addOverride(dimen.rounded_corner_radius, 0);
+
+        mRoundedCorners.start();
+        // No views added.
+        verify(mWindowManager, never()).addView(any(), any());
+        // No Fragments watched.
+        verify(mFragmentHostManager, never()).addTagListener(any(), any());
+        // No Tuners tuned.
+        verify(mTunerService, never()).addTunable(any(), any());
+    }
+
+    @Test
+    public void testRounding() {
+        mContext.getOrCreateTestableResources().addOverride(dimen.rounded_corner_radius, 20);
+
+        mRoundedCorners.start();
+        // Add 2 windows for rounded corners (top and bottom).
+        verify(mWindowManager, times(2)).addView(any(), any());
+
+        // Add 3 tag listeners for each of the fragments that are needed.
+        verify(mFragmentHostManager, times(3)).addTagListener(any(), any());
+        // One tunable.
+        verify(mTunerService, times(1)).addTunable(any(), any());
+        // One TunablePadding.
+        verify(mTunablePaddingService, times(1)).add(any(), anyString(), anyInt(), anyInt());
+    }
+
+    @Test
+    public void testPaddingTagListener() {
+        TunablePaddingTagListener tagListener = new TunablePaddingTagListener(14, 5);
+        View v = mock(View.class);
+        View child = mock(View.class);
+        Fragment f = mock(Fragment.class);
+        TunablePadding padding = mock(TunablePadding.class);
+
+        when(mTunablePaddingService.add(any(), anyString(), anyInt(), anyInt()))
+                .thenReturn(padding);
+        when(f.getView()).thenReturn(v);
+        when(v.findViewById(5)).thenReturn(child);
+
+        // Trigger callback and verify we get a TunablePadding created.
+        tagListener.onFragmentViewCreated(null, f);
+        verify(mTunablePaddingService).add(eq(child), eq(RoundedCorners.PADDING), eq(14),
+                eq(FLAG_START | FLAG_END));
+
+        // Call again and verify destroy is called.
+        tagListener.onFragmentViewCreated(null, f);
+        verify(padding).destroy();
+    }
+
+}

packages/SystemUI/tests/src/com/android/systemui/SysuiTestableContext.java

@@ -31,6 +31,11 @@ public class SysuiTestableContext extends TestableContext implements SysUiServic
         super(base, check);
     }
 
+    public ArrayMap<Class<?>, Object> getComponents() {
+        if (mComponents == null) mComponents = new ArrayMap<>();
+        return mComponents;
+    }
+
     @SuppressWarnings("unchecked")
     public <T> T getComponent(Class<T> interfaceType) {
         return (T) (mComponents != null ? mComponents.get(interfaceType) : null);

packages/SystemUI/tests/src/com/android/systemui/tuner/TunablePaddingTest.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2017 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.systemui.tuner;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.withSettings;
+
+import android.testing.LeakCheck.Tracker;
+import android.util.DisplayMetrics;
+import android.view.View;
+import android.view.WindowManager;
+
+import com.android.systemui.utils.leaks.LeakCheckedTest;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class TunablePaddingTest extends LeakCheckedTest {
+
+    private static final String KEY = "KEY";
+    private static final int DEFAULT = 42;
+    private View mView;
+    private TunablePadding mTunablePadding;
+    private TunerService mTunerService;
+
+    @Before
+    public void setup() {
+        injectLeakCheckedDependencies(ALL_SUPPORTED_CLASSES);
+        mView = mock(View.class, withSettings().spiedInstance(new View(mContext)));
+
+        mTunerService = mDependency.injectMockDependency(TunerService.class);
+        Tracker tracker = mLeakCheck.getTracker("tuner");
+        doAnswer(invocation -> {
+            tracker.getLeakInfo(invocation.getArguments()[0]).addAllocation(new Throwable());
+            return null;
+        }).when(mTunerService).addTunable(any(), any());
+        doAnswer(invocation -> {
+            tracker.getLeakInfo(invocation.getArguments()[0]).clearAllocations();
+            return null;
+        }).when(mTunerService).removeTunable(any());
+    }
+
+    @Test
+    public void testFlags() {
+        mTunablePadding = TunablePadding.addTunablePadding(mView, KEY, DEFAULT,
+                TunablePadding.FLAG_START);
+        mTunablePadding.onTuningChanged(null, null);
+        verify(mView).setPadding(eq(DEFAULT), eq(0), eq(0), eq(0));
+        mTunablePadding.destroy();
+
+        mTunablePadding = TunablePadding.addTunablePadding(mView, KEY, DEFAULT,
+                TunablePadding.FLAG_TOP);
+        mTunablePadding.onTuningChanged(null, null);
+        verify(mView).setPadding(eq(0), eq(DEFAULT), eq(0), eq(0));
+        mTunablePadding.destroy();
+
+        mTunablePadding = TunablePadding.addTunablePadding(mView, KEY, DEFAULT,
+                TunablePadding.FLAG_END);
+        mTunablePadding.onTuningChanged(null, null);
+        verify(mView).setPadding(eq(0), eq(0), eq(DEFAULT), eq(0));
+        mTunablePadding.destroy();
+
+        mTunablePadding = TunablePadding.addTunablePadding(mView, KEY, DEFAULT,
+                TunablePadding.FLAG_BOTTOM);
+        mTunablePadding.onTuningChanged(null, null);
+        verify(mView).setPadding(eq(0), eq(0), eq(0), eq(DEFAULT));
+        mTunablePadding.destroy();
+    }
+
+    @Test
+    public void testRtl() {
+        when(mView.isLayoutRtl()).thenReturn(true);
+
+        mTunablePadding = TunablePadding.addTunablePadding(mView, KEY, DEFAULT,
+                TunablePadding.FLAG_END);
+        mTunablePadding.onTuningChanged(null, null);
+        verify(mView).setPadding(eq(DEFAULT), eq(0), eq(0), eq(0));
+        mTunablePadding.destroy();
+
+        mTunablePadding = TunablePadding.addTunablePadding(mView, KEY, DEFAULT,
+                TunablePadding.FLAG_START);
+        mTunablePadding.onTuningChanged(null, null);
+        verify(mView).setPadding(eq(0), eq(0), eq(DEFAULT), eq(0));
+        mTunablePadding.destroy();
+    }
+
+    @Test
+    public void testTuning() {
+        int value = 3;
+        mTunablePadding = TunablePadding.addTunablePadding(mView, KEY, DEFAULT,
+                TunablePadding.FLAG_START);
+        mTunablePadding.onTuningChanged(KEY, String.valueOf(value));
+
+        DisplayMetrics metrics = new DisplayMetrics();
+        mContext.getSystemService(WindowManager.class).getDefaultDisplay().getMetrics(metrics);
+        int output = (int) (metrics.density * value);
+        verify(mView).setPadding(eq(output), eq(0), eq(0), eq(0));
+
+        mTunablePadding.destroy();
+    }
+}