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Commit 795b7db8 authored by Treehugger Robot's avatar Treehugger Robot Committed by Android (Google) Code Review
Browse files

Merge changes Ib1303387,I51e93597 into main 

* changes:
  Fix: Invalidate Icon's Resources cache on configuration change
  ApplicationPackageManager: use display aware Configuration for Resources
parents 788876db c547e9fb

core/java/android/app/ApplicationPackageManager.java

+10 −1
Original line number Diff line number Diff line
@@ -128,6 +128,7 @@ import android.util.LauncherIcons; 
import android.util.Log;

import android.util.Slog;

import android.util.Xml;

import android.window.DesktopExperienceFlags;



import com.android.internal.annotations.GuardedBy;

import com.android.internal.annotations.VisibleForTesting;
@@ -2162,8 +2163,16 @@ public class ApplicationPackageManager extends PackageManager { 
    @Override

    public Resources getResourcesForApplication(@NonNull ApplicationInfo app)

            throws NameNotFoundException {

        if (DesktopExperienceFlags.USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS.isTrue()) {

            // To support multiple displays, we need to use the Configuration of the Resources

            // associated with the Display of the current Context.

            // Otherwise, we will be using wrong resource qualifiers due to different display

            // configurations.

            return getResourcesForApplication(app, mContext.getResources().getConfiguration());

        } else {

            return getResourcesForApplication(app, null);

        }

    }



    @Override

    public Resources getResourcesForApplication(@NonNull ApplicationInfo app,

core/tests/coretests/src/android/app/ApplicationPackageManagerTest.java

+139 −0
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ import static android.content.pm.PackageManager.MATCH_DIRECT_BOOT_UNAWARE; 
import static android.os.storage.VolumeInfo.STATE_MOUNTED;

import static android.os.storage.VolumeInfo.STATE_UNMOUNTED;



import static com.android.graphics.flags.Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS;



import static com.google.common.truth.Truth.assertThat;



import static org.mockito.ArgumentMatchers.any;
@@ -47,21 +49,35 @@ import android.content.pm.PackageInfo; 
import android.content.pm.PackageItemInfo;

import android.content.pm.PackageManager.ResolveInfoFlags;

import android.content.pm.ResolveInfo;

import android.content.res.Configuration;

import android.content.res.Resources;

import android.content.res.TypedArray;

import android.content.res.XmlResourceParser;

import android.hardware.display.DisplayManagerGlobal;

import android.os.Bundle;

import android.os.storage.StorageManager;

import android.os.storage.VolumeInfo;

import android.platform.test.annotations.DisableFlags;

import android.platform.test.annotations.EnableFlags;

import android.platform.test.annotations.Presubmit;

import android.platform.test.flag.junit.SetFlagsRule;

import android.util.DisplayMetrics;

import android.view.Display;

import android.view.DisplayInfo;



import androidx.annotation.NonNull;

import androidx.test.ext.junit.runners.AndroidJUnit4;

import androidx.test.filters.LargeTest;

import androidx.test.platform.app.InstrumentationRegistry;



import com.android.internal.annotations.VisibleForTesting;



import junit.framework.TestCase;



import org.junit.ClassRule;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.ArgumentMatcher;

import org.mockito.Mockito;

import org.xmlpull.v1.XmlPullParser;
@@ -73,7 +89,13 @@ import java.util.List; 


@Presubmit

@LargeTest

@RunWith(AndroidJUnit4.class)

public class ApplicationPackageManagerTest extends TestCase {



    @ClassRule public static final SetFlagsRule.ClassRule mClassRule = new SetFlagsRule.ClassRule(

            com.android.graphics.flags.Flags.class);

    @Rule public final SetFlagsRule mSetFlagsRule = mClassRule.createSetFlagsRule();



    private static final String sInternalVolPath = "/data";

    private static final String sAdoptedVolPath = "/mnt/expand/123";

    private static final String sPublicVolPath = "/emulated";
@@ -204,6 +226,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
        }

    }



    @Test

    public void testGetCandidateVolumes_systemApp() throws Exception {

        ApplicationInfo sysAppInfo = new ApplicationInfo();

        sysAppInfo.flags = ApplicationInfo.FLAG_SYSTEM;
@@ -235,6 +258,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
        verifyReturnedVolumes(candidates, sInternalVol);

    }



    @Test

    public void testGetCandidateVolumes_3rdParty_internalOnly() throws Exception {

        ApplicationInfo appInfo = new ApplicationInfo();

        StorageManager storageManager = getMockedStorageManager();
@@ -264,6 +288,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
        }

    }



    @Test

    public void testGetCandidateVolumes_3rdParty_auto() throws Exception {

        ApplicationInfo appInfo = new ApplicationInfo();

        StorageManager storageManager = getMockedStorageManager();
@@ -302,12 +327,14 @@ public class ApplicationPackageManagerTest extends TestCase { 
        }

    }



    @Test

    public void testExtractPackageItemInfoAttributes_noServiceInfo() {

        final MockedApplicationPackageManager appPkgMgr = new MockedApplicationPackageManager();

        assertThat(appPkgMgr.extractPackageItemInfoAttributes(null, null, null,

                new int[]{})).isNull();

    }



    @Test

    public void testExtractPackageItemInfoAttributes_noMetaData() {

        final MockedApplicationPackageManager appPkgMgr = new MockedApplicationPackageManager();

        final PackageItemInfo packageItemInfo = mock(PackageItemInfo.class);
@@ -315,6 +342,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
                new int[]{})).isNull();

    }



    @Test

    public void testExtractPackageItemInfoAttributes_noParser() {

        final MockedApplicationPackageManager appPkgMgr = new MockedApplicationPackageManager();

        final PackageItemInfo packageItemInfo = mock(PackageItemInfo.class);
@@ -324,6 +352,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
                new int[]{})).isNull();

    }



    @Test

    public void testExtractPackageItemInfoAttributes_noMetaDataXml() {

        final MockedApplicationPackageManager appPkgMgr = new MockedApplicationPackageManager();

        final PackageItemInfo packageItemInfo = mock(PackageItemInfo.class);
@@ -334,6 +363,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
                new int[]{})).isNull();

    }



    @Test

    public void testExtractPackageItemInfoAttributes_nonMatchingRootTag() throws Exception {

        final String rootTag = "rootTag";

        final MockedApplicationPackageManager appPkgMgr = new MockedApplicationPackageManager();
@@ -350,6 +380,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
                new int[]{})).isNull();

    }



    @Test

    public void testExtractPackageItemInfoAttributes_successfulExtraction() throws Exception {

        final String rootTag = "rootTag";

        final MockedApplicationPackageManager appPkgMgr = new MockedApplicationPackageManager();
@@ -371,6 +402,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
                new int[]{})).isEqualTo(attributes);

    }



    @Test

    public void testGetLaunchIntentForPackage_categoryInfoActivity_returnsIt() throws Exception {

        String pkg = "com.some.package";

        int userId = 42;
@@ -406,6 +438,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
                eq(userId));

    }



    @Test

    public void testGetLaunchIntentForPackage_categoryLauncherActivity_returnsIt() {

        String pkg = "com.some.package";

        int userId = 42;
@@ -441,6 +474,7 @@ public class ApplicationPackageManagerTest extends TestCase { 
        assertThat(intent.getFlags()).isEqualTo(FLAG_ACTIVITY_NEW_TASK);

    }



    @Test

    public void testGetLaunchIntentForPackage_noSuitableActivity_returnsNull() throws Exception {

        String pkg = "com.some.package";

        int userId = 42;
@@ -458,6 +492,111 @@ public class ApplicationPackageManagerTest extends TestCase { 
        assertThat(intent).isNull();

    }



    @DisableFlags(FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void getResourcesForApplication_flagDisabled_nonSystemPackage_returnsDefaultResources()

            throws Exception {

        ApplicationInfo appInfo = createApplicationInfoForPackage("com.example");

        Context defaultDisplayContext = InstrumentationRegistry.getInstrumentation().getContext();

        int defaultDisplayDensityDpi =

                defaultDisplayContext.getResources().getConfiguration().densityDpi;

        Context newDisplayContext =

                defaultDisplayContext.createDisplayContext(createSecondaryDisplay());



        ApplicationPackageManager packageManager =

                (ApplicationPackageManager) newDisplayContext.getPackageManager();



        Resources resourcesForApplication = packageManager.getResourcesForApplication(appInfo);



        assertThat(resourcesForApplication.getConfiguration().densityDpi)

                .isEqualTo(defaultDisplayDensityDpi);

    }



    @DisableFlags(FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void getResourcesForApplication_flagDisabled_systemPackage_returnsDefaultResources()

            throws Exception {

        ApplicationInfo appInfo = createApplicationInfoForPackage("system");

        Context defaultDisplayContext = InstrumentationRegistry.getInstrumentation().getContext();

        int defaultDisplayDensityDpi =

                defaultDisplayContext.getResources().getConfiguration().densityDpi;

        Context newDisplayContext =

                defaultDisplayContext.createDisplayContext(createSecondaryDisplay());



        ApplicationPackageManager packageManager =

                (ApplicationPackageManager) newDisplayContext.getPackageManager();



        Resources resourcesForApplication = packageManager.getResourcesForApplication(appInfo);



        assertThat(resourcesForApplication.getConfiguration().densityDpi)

                .isEqualTo(defaultDisplayDensityDpi);

    }



    @EnableFlags(FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void getResourcesForApplication_flagEnabled_nonSystemPackage_returnsNewDisplayResources()

            throws Exception {

        ApplicationInfo appInfo = createApplicationInfoForPackage("com.example");

        Context defaultDisplayContext = InstrumentationRegistry.getInstrumentation().getContext();

        Context newDisplayContext =

                defaultDisplayContext.createDisplayContext(createSecondaryDisplay());

        int newDisplayDensityDpi = newDisplayContext.getResources().getConfiguration().densityDpi;



        final ApplicationPackageManager pm =

                (ApplicationPackageManager) newDisplayContext.getPackageManager();



        Resources resourcesForApplication = pm.getResourcesForApplication(appInfo);

        assertThat(resourcesForApplication.getConfiguration().densityDpi)

                .isEqualTo(newDisplayDensityDpi);

    }



    @EnableFlags(FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void getResourcesForApplication_flagEnabled_systemPackage_returnsNewDisplayResources()

            throws Exception {

        ApplicationInfo appInfo = createApplicationInfoForPackage("system");

        Context defaultDisplayContext = InstrumentationRegistry.getInstrumentation().getContext();

        Context newDisplayContext =

                defaultDisplayContext.createDisplayContext(createSecondaryDisplay());

        int newDisplayDensityDpi = newDisplayContext.getResources().getConfiguration().densityDpi;



        final ApplicationPackageManager pm =

                (ApplicationPackageManager) newDisplayContext.getPackageManager();



        Resources resourcesForApplication = pm.getResourcesForApplication(appInfo);

        assertThat(resourcesForApplication.getConfiguration().densityDpi)

                .isEqualTo(newDisplayDensityDpi);

    }



    private static ApplicationInfo createApplicationInfoForPackage(String packageName) {

        final ApplicationInfo appInfo = new ApplicationInfo();

        appInfo.packageName = packageName;

        return appInfo;

    }



    /**

     * Creates a new {@link Display} object representing a secondary display.

     *

     * <p>The returned display has a different density than the default display.

     */

    private Display createSecondaryDisplay() {

        Context context = InstrumentationRegistry.getInstrumentation().getContext();

        Resources resources = context.getResources();

        DisplayMetrics displayMetrics = new DisplayMetrics();

        displayMetrics.densityDpi = resources.getConfiguration().densityDpi + 100;

        Configuration configuration = new Configuration();

        configuration.densityDpi = displayMetrics.densityDpi;

        Resources newResources =

                new Resources(context.getAssets(), displayMetrics, configuration);

        DisplayInfo displayInfo = new DisplayInfo();

        displayInfo.displayId = context.getDisplayId() + 1;

        return new Display(

                DisplayManagerGlobal.getInstance(),

                displayInfo.displayId,

                displayInfo,

                newResources);

    }



    /** Equality check for intents -- ignoring extras */

    private static Intent eqIntent(Intent wanted) {

        return argThat(

core/tests/coretests/src/android/graphics/drawable/IconTest.java

+179 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ import android.content.ContentProvider; 
import android.content.Context;

import android.content.Intent;

import android.content.pm.ParceledListSlice;

import android.content.res.Configuration;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.RecordingCanvas;
@@ -37,16 +39,22 @@ import android.os.HandlerThread; 
import android.os.IBinder;

import android.os.Parcel;

import android.os.RemoteException;

import android.platform.test.annotations.DisableFlags;

import android.platform.test.annotations.EnableFlags;

import android.platform.test.flag.junit.SetFlagsRule;

import android.util.Log;



import androidx.test.core.app.ApplicationProvider;



import com.android.frameworks.coretests.R;

import com.android.graphics.flags.Flags;



import com.google.testing.junit.testparameterinjector.TestParameter;

import com.google.testing.junit.testparameterinjector.TestParameterInjector;



import org.junit.Before;

import org.junit.ClassRule;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;
@@ -60,6 +68,11 @@ import java.util.Arrays; 
@RunWith(TestParameterInjector.class)

public class IconTest {

    public static final String TAG = IconTest.class.getSimpleName();



    @ClassRule public static final SetFlagsRule.ClassRule mClassRule = new SetFlagsRule.ClassRule(

            com.android.graphics.flags.Flags.class);

    @Rule public final SetFlagsRule mSetFlagsRule = mClassRule.createSetFlagsRule();



    private Context mContext;



    public static void L(String s, Object... parts) {
@@ -610,6 +623,172 @@ public class IconTest { 
        assertThat(loadedDrawable).isNull();

    }



    @EnableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void testLoadDrawable_withConfigurationChange_flagEnabled_invalidatesCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawable(mContext);

        final int initialDpi = icon.getResources().getConfiguration().densityDpi;



        // Create a new context with a different configuration

        final Configuration newConfig =

                new Configuration(mContext.getResources().getConfiguration());

        final int newDpi = initialDpi + 100;

        newConfig.densityDpi = newDpi;

        final Context newContext = mContext.createConfigurationContext(newConfig);



        // Load again with the new context

        icon.loadDrawable(newContext);



        // Verify that the cached resources have been updated to the new configuration

        assertThat(icon.getResources().getConfiguration().densityDpi).isEqualTo(newDpi);

    }



    @DisableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void testLoadDrawable_withConfigurationChange_flagDisabled_doesNotInvalidateCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawable(mContext);

        final int initialDpi = icon.getResources().getConfiguration().densityDpi;



        // Create a new context with a different configuration

        final Configuration newConfig =

                new Configuration(mContext.getResources().getConfiguration());

        final int newDpi = initialDpi + 100;

        newConfig.densityDpi = newDpi;

        final Context newContext = mContext.createConfigurationContext(newConfig);



        // Load again with the new context

        icon.loadDrawable(newContext);



        // Verify that the cached resources have NOT been updated, as the flag is off

        assertThat(icon.getResources().getConfiguration().densityDpi).isEqualTo(initialDpi);

    }



    @EnableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void testLoadDrawableAsUser_withConfigurationChange_flagEnabled_invalidatesCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawableAsUser(mContext, mContext.getUserId());

        final int initialDpi = icon.getResources().getConfiguration().densityDpi;



        // Create a new context with a different configuration

        final Configuration newConfig =

                new Configuration(mContext.getResources().getConfiguration());

        final int newDpi = initialDpi + 100;

        newConfig.densityDpi = newDpi;

        final Context newContext = mContext.createConfigurationContext(newConfig);



        // Load again with the new context

        icon.loadDrawableAsUser(newContext, newContext.getUserId());



        // Verify that the cached resources have been updated to the new configuration

        assertThat(icon.getResources().getConfiguration().densityDpi).isEqualTo(newDpi);

    }



    @DisableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void

            testLoadDrawableAsUser_withConfigurationChange_flagDisabled_doesNotInvalidateCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawableAsUser(mContext, mContext.getUserId());

        final int initialDpi = icon.getResources().getConfiguration().densityDpi;



        // Create a new context with a different configuration

        final Configuration newConfig =

                new Configuration(mContext.getResources().getConfiguration());

        final int newDpi = initialDpi + 100;

        newConfig.densityDpi = newDpi;

        final Context newContext = mContext.createConfigurationContext(newConfig);



        // Load again with the new context

        icon.loadDrawableAsUser(newContext, newContext.getUserId());



        // Verify that the cached resources have NOT been updated, as the flag is off

        assertThat(icon.getResources().getConfiguration().densityDpi).isEqualTo(initialDpi);

    }



    @EnableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void testLoadDrawable_withNoConfigurationChange_flagEnabled_doesNotInvalidateCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawable(mContext);

        final Resources initialResources = icon.getResources();



        // Load again with the same context

        icon.loadDrawable(mContext);



        // Verify that the cached resources have NOT been updated

        assertThat(icon.getResources()).isSameInstanceAs(initialResources);

    }



    @EnableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void

            testLoadDrawableAsUser_withNoConfigurationChange_flagEnabled_doesNotInvalidateCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawableAsUser(mContext, mContext.getUserId());

        final Resources initialResources = icon.getResources();



        // Load again with the same context

        icon.loadDrawableAsUser(mContext, mContext.getUserId());



        // Verify that the cached resources have NOT been updated

        assertThat(icon.getResources()).isSameInstanceAs(initialResources);

    }



    @DisableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void testLoadDrawable_withNoConfigurationChange_flagDisabled_doesNotInvalidateCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawable(mContext);

        final Resources initialResources = icon.getResources();



        // Load again with the same context

        icon.loadDrawable(mContext);



        // Verify that the cached resources have NOT been updated

        assertThat(icon.getResources()).isSameInstanceAs(initialResources);

    }



    @DisableFlags(Flags.FLAG_USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS)

    @Test

    public void

            testLoadDrawableAsUser_withNoConfigurationChange_flagDisabled_doesNotInvalidateCache() {

        final String resPackage = mContext.getPackageName();

        final Icon icon = Icon.createWithResource(resPackage, R.drawable.landscape);



        // Initial load with default configuration

        icon.loadDrawableAsUser(mContext, mContext.getUserId());

        final Resources initialResources = icon.getResources();



        // Load again with the same context

        icon.loadDrawableAsUser(mContext, mContext.getUserId());



        // Verify that the cached resources have NOT been updated

        assertThat(icon.getResources()).isSameInstanceAs(initialResources);

    }



    // ======== utils ========

graphics/java/android/graphics/drawable/Icon.java

+16 −0
Original line number Diff line number Diff line
@@ -485,6 +485,7 @@ public final class Icon implements Parcelable { 
                return new AdaptiveIconDrawable(null,

                    new BitmapDrawable(context.getResources(), fixMaxBitmapSize(getBitmap())));

            case TYPE_RESOURCE:

                invalidateResourcesCacheIfNeeded(context);

                if (getResources() == null) {

                    // figure out where to load resources from

                    String resPackage = getResPackage();
@@ -595,6 +596,7 @@ public final class Icon implements Parcelable { 
            if (TextUtils.isEmpty(resPackage)) {

                resPackage = context.getPackageName();

            }

            invalidateResourcesCacheIfNeeded(context);

            if (getResources() == null && !(getResPackage().equals("android"))) {

                // TODO(b/173307037): Move CONTEXT_INCLUDE_CODE to ContextImpl.createContextAsUser

                final Context userContext;
@@ -623,6 +625,20 @@ public final class Icon implements Parcelable { 
        return loadDrawable(context);

    }



    private void invalidateResourcesCacheIfNeeded(Context context) {

        if (!DesktopExperienceFlags.USE_RESOURCES_FROM_CONTEXT_TO_CREATE_DRAWABLE_ICONS.isTrue()) {

            return;

        }

        if (mType == TYPE_RESOURCE && mObj1 != null) {

            Resources cachedResources = (Resources) mObj1;

            if (cachedResources.getConfiguration().diff(context.getResources().getConfiguration())

                    != 0) {

                // Invalidate the cache if the configuration has changed.

                mObj1 = null;

            }

        }

    }



    /**

     * Load a drawable, but in the case of URI types, it will check if the passed uid has a grant

     * to load the resource. The check will be performed using the permissions of the passed uid,

packages/SystemUI/multivalentTests/src/com/android/systemui/statusbar/StatusBarIconViewTest.java

+2 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ import android.content.Context; 
import android.content.ContextWrapper;

import android.content.pm.ApplicationInfo;

import android.content.pm.PackageManager;

import android.content.res.Configuration;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.Color;
@@ -86,6 +87,7 @@ public class StatusBarIconViewTest extends SysuiTestCase { 
    public void setUp() throws Exception {

        // Set up context such that asking for "mockPackage" resources returns mMockResources.

        mMockResources = mock(Resources.class);

        doReturn(new Configuration()).when(mMockResources).getConfiguration();

        mPackageManagerSpy = spy(getContext().getPackageManager());

        doReturn(mMockResources).when(mPackageManagerSpy)

                .getResourcesForApplication(eq("mockPackage"));