Merge "Add a deletion helper view for clearing space." into nyc-mr1-dev

am: 179103258e

* commit '179103258e4e664fbdd76b8440aff3edae86b093':
  Add a deletion helper view for clearing space.

Change-Id: If02b00b3e35e717508ae69894a36ac71a1c3c30f

AndroidManifest.xml

@@ -81,6 +81,7 @@
     <uses-permission android:name="android.permission.CHANGE_APP_IDLE_STATE" />
     <uses-permission android:name="android.permission.PEERS_MAC_ADDRESS"/>
     <uses-permission android:name="android.permission.MANAGE_NOTIFICATIONS"/>
+    <uses-permission android:name="android.permission.DELETE_PACKAGES"/>
 
     <application android:label="@string/settings_label"
             android:icon="@mipmap/ic_launcher_settings"

res/layout/app_item.xml

@@ -60,6 +60,14 @@
         android:textColor="?android:attr/textColorSecondary"
         android:duplicateParentState="true" />
 
+    <Switch
+            android:id="@android:id/switch_widget"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_alignParentRight="true"
+            android:background="@null"
+            android:visibility="gone"/>
+
     <FrameLayout
         android:id="@android:id/widget_frame"
         android:layout_width="wrap_content"

res/menu/storage_volume.xml

@@ -30,4 +30,7 @@
     <item
         android:id="@+id/storage_migrate"
         android:title="@string/storage_menu_migrate" />
+    <item
+        android:id="@+id/storage_free"
+        android:title="@string/storage_menu_free" />
 </menu>

res/values/strings.xml

@@ -2441,6 +2441,8 @@
     <string name="storage_menu_set_up">Set up</string>
     <!-- Storage setting.  Menu option for exploring a storage device [CHAR LIMIT=30]-->
     <string name="storage_menu_explore">Explore</string>
+    <!-- Storage setting. Menu option for using the deletion helper. [CHAR LIMIT=30] -->
+    <string name="storage_menu_free">Free up space</string>
 
     <!-- Storage setting.  Title for USB transfer settings [CHAR LIMIT=30]-->
     <string name="storage_title_usb">USB computer connection</string>

res/xml/deletion_helper_list.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2016 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.
+-->
+
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+                  android:title="@string/deletion_helper_title">
+
+    <PreferenceCategory
+            android:key="apps_group"
+            android:title="@string/deletion_helper_apps_title" />
+
+</PreferenceScreen>

src/com/android/settings/deletionhelper/AppDeletionPreference.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2016 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.settings.deletionhelper;
+
+import android.content.Context;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.text.format.Formatter;
+import android.view.View;
+import android.widget.Switch;
+import android.widget.TextView;
+import com.android.settings.R;
+
+import com.android.settingslib.applications.ApplicationsState;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+
+/**
+ * Preference item for an app with a switch to signify if it should be uninstalled.
+ * This shows the name and icon of the app along with the days since its last use.
+ */
+public class AppDeletionPreference extends SwitchPreference {
+    private AppEntry mEntry;
+    private Context mContext;
+
+    public AppDeletionPreference(Context context, AppEntry item, ApplicationsState state) {
+        super(context);
+        mEntry = item;
+        mContext = context;
+        setLayoutResource(com.android.settings.R.layout.preference_app);
+        setWidgetLayoutResource(R.layout.widget_text_views);
+
+        synchronized (item) {
+            state.ensureIcon(item);
+            if (item.icon != null)
+                setIcon(item.icon);
+            if (item.label != null)
+                setTitle(item.label);
+        }
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        Switch switchWidget = (Switch) holder.findViewById(com.android.internal.R.id.switch_widget);
+        switchWidget.setVisibility(View.VISIBLE);
+
+        TextView summary = (TextView) holder.findViewById(R.id.widget_text1);
+        updateSummaryText(summary);
+    }
+
+    public String getPackageName() {
+        return mEntry.label;
+    }
+
+    private void updateSummaryText(TextView summary) {
+        if (mEntry.extraInfo == null) return;
+        if (mEntry.size == ApplicationsState.SIZE_UNKNOWN ||
+                mEntry.size == ApplicationsState.SIZE_INVALID) {
+            return;
+        }
+
+        long daysSinceLastUse = (long) mEntry.extraInfo;
+        String fileSize = Formatter.formatFileSize(mContext, mEntry.size);
+        if (daysSinceLastUse == AppStateUsageStatsBridge.NEVER_USED) {
+            summary.setText(mContext.getString(R.string.deletion_helper_app_summary_never_used,
+                    fileSize));
+        } else if (daysSinceLastUse == AppStateUsageStatsBridge.UNKNOWN_LAST_USE) {
+            summary.setText(mContext.getString(R.string.deletion_helper_app_summary_unknown_used,
+                    fileSize));
+        } else {
+            summary.setText(mContext.getString(R.string.deletion_helper_app_summary,
+                    fileSize,
+                    daysSinceLastUse));
+        }
+    }
+
+}

src/com/android/settings/deletionhelper/AppStateUsageStatsBridge.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2016 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.settings.deletionhelper;
+
+import android.app.usage.UsageStats;
+import android.app.usage.UsageStatsManager;
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+
+import com.android.settings.applications.AppStateBaseBridge;
+import com.android.settingslib.applications.ApplicationsState;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+import com.android.settingslib.applications.ApplicationsState.AppFilter;
+
+import java.util.ArrayList;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Connects data from the UsageStatsManager to the ApplicationsState.
+ */
+public class AppStateUsageStatsBridge extends AppStateBaseBridge {
+    private UsageStatsManager mUsageStatsManager;
+    public static final long NEVER_USED = -1;
+    public static final long UNKNOWN_LAST_USE = -2;
+
+    public AppStateUsageStatsBridge(Context context, ApplicationsState appState,
+                                    Callback callback) {
+        super(appState, callback);
+        mUsageStatsManager =
+                (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
+    }
+
+    @Override
+    protected void loadAllExtraInfo() {
+        ArrayList<AppEntry> apps = mAppSession.getAllApps();
+        if (apps == null) return;
+
+        final Map<String, UsageStats> map = mUsageStatsManager.queryAndAggregateUsageStats(0,
+                System.currentTimeMillis());
+        for (AppEntry entry : apps) {
+            UsageStats usageStats = map.get(entry.info.packageName);
+            entry.extraInfo = getDaysSinceLastUse(usageStats);
+        }
+    }
+
+    @Override
+    protected void updateExtraInfo(AppEntry app, String pkg, int uid) {
+        Map<String, UsageStats> map = mUsageStatsManager.queryAndAggregateUsageStats(0,
+                System.currentTimeMillis());
+        UsageStats usageStats = map.get(app.info.packageName);
+        app.extraInfo = getDaysSinceLastUse(usageStats);
+    }
+
+    private long getDaysSinceLastUse(UsageStats stats) {
+        if (stats == null) {
+            return NEVER_USED;
+        }
+        long lastUsed = stats.getLastTimeUsed();
+        // Sometimes, a usage is recorded without a time and we don't know when the use was.
+        if (lastUsed == 0) {
+            return UNKNOWN_LAST_USE;
+        }
+        return TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis() - lastUsed);
+
+    }
+
+    /**
+     * Filters only non-system apps which haven't been used in the last 60 days. If an app's last
+     * usage is unknown, it is skipped.
+     */
+    public static final AppFilter FILTER_USAGE_STATS = new AppFilter() {
+        private long UNUSED_DAYS_DELETION_THRESHOLD = 60;
+
+        @Override
+        public void init() {
+        }
+
+        @Override
+        public boolean filterApp(AppEntry info) {
+            if (info == null) return false;
+            boolean isBundled = (info.info.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
+            return isExtraInfoValid(info.extraInfo) && !isBundled;
+        }
+
+        private boolean isExtraInfoValid(Object extraInfo) {
+            if (extraInfo == null || !(extraInfo instanceof Long)) {
+                return false;
+            }
+
+            long daysSinceLastUse = (long) extraInfo;
+            return daysSinceLastUse >= UNUSED_DAYS_DELETION_THRESHOLD ||
+                    daysSinceLastUse == NEVER_USED;
+        }
+    };
+}

src/com/android/settings/deletionhelper/DeletionHelperFragment.java

@@ -0,0 +1,262 @@
+package com.android.settings.deletionhelper;
+
+import android.os.Bundle;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceGroup;
+import android.text.format.Formatter;
+import android.util.ArraySet;
+import android.util.Log;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.CompoundButton;
+import android.widget.LinearLayout;
+import android.widget.RelativeLayout;
+import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.R;
+import com.android.internal.logging.MetricsProto.MetricsEvent;
+import com.android.settings.applications.AppStateBaseBridge;
+import com.android.settings.deletionhelper.AppStateUsageStatsBridge;
+import com.android.settings.deletionhelper.AppDeletionPreference;
+import com.android.settingslib.applications.ApplicationsState;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+import com.android.settingslib.applications.ApplicationsState.Callbacks;
+import com.android.settingslib.applications.ApplicationsState.Session;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashSet;
+
+/**
+ * Settings screen for the deletion helper, which manually removes data which is not recently used.
+ */
+public class DeletionHelperFragment extends SettingsPreferenceFragment implements
+        ApplicationsState.Callbacks, AppStateBaseBridge.Callback, Preference.OnPreferenceChangeListener {
+    private static final String TAG = "DeletionHelperFragment";
+
+    private static final String EXTRA_HAS_BRIDGE = "hasBridge";
+    private static final String EXTRA_HAS_SIZES = "hasSizes";
+    private static final String EXTRA_CHECKED_SET = "checkedSet";
+
+    private static final String KEY_APPS_GROUP = "apps_group";
+
+    private Button mCancel, mFree;
+    private PreferenceGroup mApps;
+
+    private ApplicationsState mState;
+    private Session mSession;
+    private HashSet<String> mUncheckedApplications;
+    private AppStateUsageStatsBridge mDataUsageBridge;
+    private ArrayList<AppEntry> mAppEntries;
+    private boolean mHasReceivedAppEntries, mHasReceivedBridgeCallback, mFinishedLoading;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mState = ApplicationsState.getInstance(getActivity().getApplication());
+        mSession = mState.newSession(this);
+        mUncheckedApplications = new HashSet<>();
+        mDataUsageBridge = new AppStateUsageStatsBridge(getActivity(), mState, this);
+
+        addPreferencesFromResource(R.xml.deletion_helper_list);
+        mApps = (PreferenceGroup) findPreference(KEY_APPS_GROUP);
+
+        if (savedInstanceState != null) {
+            mHasReceivedAppEntries =
+                    savedInstanceState.getBoolean(EXTRA_HAS_SIZES, false);
+            mHasReceivedBridgeCallback =
+                    savedInstanceState.getBoolean(EXTRA_HAS_BRIDGE, false);
+            mUncheckedApplications =
+                    (HashSet<String>) savedInstanceState.getSerializable(EXTRA_CHECKED_SET);
+        }
+    }
+
+    private void initializeButtons(View v) {
+        mCancel = (Button) v.findViewById(R.id.back_button);
+        mCancel.setText(R.string.cancel);
+        mCancel.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finishFragment();
+            }
+        });
+
+        mFree = (Button) v.findViewById(R.id.next_button);
+        mFree.setText(R.string.storage_menu_free);
+        mFree.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                ArraySet<String> apps = new ArraySet<>();
+                for (AppEntry entry : mAppEntries) {
+                    if (!mUncheckedApplications.contains(entry.label)) {
+                        synchronized (entry) {
+                            apps.add(entry.info.packageName);
+                        }
+                    }
+                }
+                // TODO: If needed, add an action on the callback.
+                PackageDeletionTask task = new PackageDeletionTask(
+                        getActivity().getPackageManager(), apps,
+                        new PackageDeletionTask.Callback() {
+                            @Override
+                            public void onSuccess() {
+                            }
+
+                            @Override
+                            public void onError() {
+                                Log.e(TAG, "An error occurred while uninstalling packages.");
+                            }
+                        });
+                finishFragment();
+                task.run();
+            }
+        });
+    }
+
+    @Override
+    public void onViewCreated(View v, Bundle savedInstanceState) {
+        super.onViewCreated(v, savedInstanceState);
+        initializeButtons(v);
+        setLoading(true, false);
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mSession.resume();
+        mDataUsageBridge.resume();
+    }
+
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putBoolean(EXTRA_HAS_SIZES, mHasReceivedAppEntries);
+        outState.putBoolean(EXTRA_HAS_BRIDGE, mHasReceivedBridgeCallback);
+        outState.putSerializable(EXTRA_CHECKED_SET, mUncheckedApplications);
+    }
+
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mDataUsageBridge.pause();
+        mSession.pause();
+    }
+
+    private void rebuild() {
+        // Only rebuild if we have the packages and their usage stats.
+        if (!mHasReceivedBridgeCallback || !mHasReceivedAppEntries) {
+            return;
+        }
+
+        final ArrayList<AppEntry> apps =
+                mSession.rebuild(AppStateUsageStatsBridge.FILTER_USAGE_STATS,
+                        ApplicationsState.SIZE_COMPARATOR);
+        mAppEntries = apps;
+        cacheRemoveAllPrefs(mApps);
+        int entryCount = apps.size();
+        for (int i = 0; i < entryCount; i++) {
+            AppEntry entry = apps.get(i);
+            final String packageName = entry.label;
+            AppDeletionPreference preference = (AppDeletionPreference) getCachedPreference(entry.label);
+            if (preference == null) {
+                preference = new AppDeletionPreference(getActivity(), entry,
+                        mState);
+                preference.setKey(packageName);
+                preference.setChecked(!mUncheckedApplications.contains(packageName));
+                preference.setOnPreferenceChangeListener(this);
+                mApps.addPreference(preference);
+            }
+            preference.setOrder(i);
+        }
+        removeCachedPrefs(mApps);
+
+        // All applications should be filled in if we've received the sizes.
+        // setLoading being called multiple times causes flickering, so we only do it once.
+        if (mHasReceivedAppEntries && !mFinishedLoading) {
+            mFinishedLoading = true;
+            setLoading(false, true);
+            getButtonBar().setVisibility(View.VISIBLE);
+        }
+        updateFreeButtonText();
+    }
+
+    private void updateFreeButtonText() {
+        mFree.setText(String.format(getActivity().getString(R.string.deletion_helper_free_button),
+                Formatter.formatFileSize(getActivity(), getTotalFreeableSpace())));
+    }
+
+    @Override
+    public void onRunningStateChanged(boolean running) {
+        // No-op.
+    }
+
+    @Override
+    public void onPackageListChanged() {
+        rebuild();
+    }
+
+    @Override
+    public void onRebuildComplete(ArrayList<AppEntry> apps) {
+    }
+
+    @Override
+    public void onPackageIconChanged() {
+    }
+
+    @Override
+    public void onPackageSizeChanged(String packageName) {
+        rebuild();
+    }
+
+    @Override
+    public void onAllSizesComputed() {
+        rebuild();
+    }
+
+    @Override
+    public void onLauncherInfoChanged() {
+    }
+
+    @Override
+    public void onLoadEntriesCompleted() {
+        mHasReceivedAppEntries = true;
+        rebuild();
+    }
+
+    @Override
+    public void onExtraInfoUpdated() {
+        mHasReceivedBridgeCallback = true;
+        rebuild();
+    }
+
+    @Override
+    protected int getMetricsCategory() {
+        return MetricsEvent.DEVICEINFO_STORAGE;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        boolean checked = (boolean) newValue;
+        String packageName = ((AppDeletionPreference) preference).getPackageName();
+        if (checked) {
+            mUncheckedApplications.remove(packageName);
+        } else {
+            mUncheckedApplications.add(packageName);
+        }
+        updateFreeButtonText();
+        return true;
+    }
+
+    private long getTotalFreeableSpace() {
+        long freeableSpace = 0;
+        for (int i = 0; i < mAppEntries.size(); i++) {
+            final AppEntry entry = mAppEntries.get(i);
+            if (!mUncheckedApplications.contains(entry.label)) {
+                freeableSpace += mAppEntries.get(i).size;
+            }
+        }
+        return freeableSpace;
+    }
+}

src/com/android/settings/deletionhelper/PackageDeletionTask.java

@@ -0,0 +1,58 @@
+package com.android.settings.deletionhelper;
+
+import android.content.pm.IPackageDeleteObserver;
+import android.content.pm.PackageManager;
+import android.os.UserHandle;
+
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Deletes a specified set of apps as a specified user and calls back once done.
+ */
+public class PackageDeletionTask {
+    private Set<String> mPackages;
+    private Callback mCallback;
+    private PackageManager mPm;
+    private UserHandle mUser;
+
+    public PackageDeletionTask(PackageManager pm, Set<String> packageNames, Callback callback) {
+        mPackages = packageNames;
+        mCallback = callback;
+        mPm = pm;
+        mUser = android.os.Process.myUserHandle();
+    }
+
+    public void run() {
+        PackageDeletionObserver observer = new PackageDeletionObserver(mPackages.size());
+        for (String packageName : mPackages) {
+            mPm.deletePackageAsUser(packageName, observer, 0, mUser.getIdentifier());
+        }
+    }
+
+    private class PackageDeletionObserver extends IPackageDeleteObserver.Stub {
+        private final AtomicInteger mPackagesRemaining = new AtomicInteger(0);
+
+        public PackageDeletionObserver(int packages) {
+            mPackagesRemaining.set(packages);
+        }
+
+        @Override
+        public void packageDeleted(String packageName, int returnCode) {
+            if (returnCode != PackageManager.DELETE_SUCCEEDED) {
+                mCallback.onError();
+                return;
+            }
+
+            int remaining = mPackagesRemaining.decrementAndGet();
+            if (remaining == 0) {
+                mCallback.onSuccess();
+            }
+        }
+    }
+
+    public static abstract class Callback {
+        public abstract void onSuccess();
+        public abstract void onError();
+    }
+}

src/com/android/settings/deviceinfo/PrivateVolumeSettings.java

@@ -58,6 +58,7 @@ import com.android.settings.Settings.StorageUseActivity;
 import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.Utils;
 import com.android.settings.applications.ManageApplications;
+import com.android.settings.deletionhelper.DeletionHelperFragment;
 import com.android.settings.deviceinfo.StorageSettings.MountTask;
 import com.android.settingslib.deviceinfo.StorageMeasurement;
 import com.android.settingslib.deviceinfo.StorageMeasurement.MeasurementDetails;
@@ -361,6 +362,7 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
         final MenuItem unmount = menu.findItem(R.id.storage_unmount);
         final MenuItem format = menu.findItem(R.id.storage_format);
         final MenuItem migrate = menu.findItem(R.id.storage_migrate);
+        final MenuItem manage = menu.findItem(R.id.storage_free);
 
         // Actions live in menu for non-internal private volumes; they're shown
         // as preference items for public volumes.
@@ -369,11 +371,13 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
             mount.setVisible(false);
             unmount.setVisible(false);
             format.setVisible(false);
+            manage.setVisible(true);
         } else {
             rename.setVisible(mVolume.getType() == VolumeInfo.TYPE_PRIVATE);
             mount.setVisible(mVolume.getState() == VolumeInfo.STATE_UNMOUNTED);
             unmount.setVisible(mVolume.isMountedReadable());
             format.setVisible(true);
+            manage.setVisible(false);
         }
 
         format.setTitle(R.string.storage_menu_format_public);
@@ -412,6 +416,10 @@ public class PrivateVolumeSettings extends SettingsPreferenceFragment {
                 intent.putExtra(VolumeInfo.EXTRA_VOLUME_ID, mVolume.getId());
                 startActivity(intent);
                 return true;
+            case R.id.storage_free:
+                startFragment(this, DeletionHelperFragment.class.getCanonicalName(),
+                        R.string.deletion_helper_title, 0, args);
+                return true;
         }
         return super.onOptionsItemSelected(item);
     }

tests/unit/src/com/android/settings/deletionhelper/PackageDeletionTaskTest.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2016 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.settings.deletionhelper;
+
+import android.test.AndroidTestCase;
+import android.content.pm.IPackageDeleteObserver;
+import android.content.pm.PackageManager;
+import android.os.RemoteException;
+import android.test.mock.MockPackageManager;
+import android.test.suitebuilder.annotation.SmallTest;
+
+import com.android.settings.deletionhelper.PackageDeletionTask;
+import com.android.settings.deletionhelper.PackageDeletionTask.Callback;
+
+import java.util.Set;
+import java.util.HashSet;
+
+public class PackageDeletionTaskTest extends AndroidTestCase {
+    private FakePackageManager mPackageManager;
+    private Set<String> mDeletedApps;
+
+    @Override
+    protected void setUp() throws Exception {
+        mPackageManager = new FakePackageManager();
+        mDeletedApps = new HashSet<String>();
+    }
+
+    @SmallTest
+    public void testDeleteNoApps() throws Exception {
+        runTask(new HashSet<String>(), false);
+    }
+
+    @SmallTest
+    public void testDeleteOneApp() throws Exception {
+        HashSet<String> appsToDelete = new HashSet<String>();
+        appsToDelete.add("app.test1");
+        runTask(appsToDelete, false);
+    }
+
+    @SmallTest
+    public void testDeleteManyApps() throws Exception {
+        HashSet<String> appsToDelete = new HashSet<String>();
+        appsToDelete.add("app.test1");
+        appsToDelete.add("app.test2");
+        runTask(appsToDelete, false);
+    }
+
+    @SmallTest
+    public void testDeleteFails() throws Exception {
+        HashSet<String> appsToDelete = new HashSet<String>();
+        appsToDelete.add("app.test1");
+        mPackageManager.deletionSucceeds = false;
+        runTask(appsToDelete, true);
+    }
+
+    private void runTask(HashSet<String> appsToDelete, boolean shouldFail) {
+        PackageDeletionTask task = new PackageDeletionTask(mPackageManager, appsToDelete,
+                new VerifierCallback(appsToDelete, shouldFail));
+        task.run();
+    }
+
+    class FakePackageManager extends MockPackageManager {
+        public boolean deletionSucceeds = true;
+
+        @Override
+        public void deletePackageAsUser(String packageName, IPackageDeleteObserver observer,
+                                        int flags, int userId) {
+            int resultCode;
+            if (deletionSucceeds) {
+                resultCode = PackageManager.DELETE_SUCCEEDED;
+                mDeletedApps.add(packageName);
+            } else {
+                resultCode = PackageManager.DELETE_FAILED_INTERNAL_ERROR;
+            }
+
+            try {
+                observer.packageDeleted(packageName, resultCode);
+            } catch (RemoteException e) {
+                fail(e.toString());
+            }
+        }
+    }
+
+    class VerifierCallback extends Callback {
+        private Set<String> mExpectedDeletedApps;
+        private boolean mShouldFail;
+
+        public VerifierCallback(HashSet<String> expectedDeletedApps, boolean shouldFail) {
+            mExpectedDeletedApps = expectedDeletedApps;
+            mShouldFail = shouldFail;
+        }
+
+        @Override
+        public void onSuccess() {
+            System.out.println("lol");
+            assertFalse(mShouldFail);
+            assertEquals(mExpectedDeletedApps, mDeletedApps);
+        }
+
+        @Override
+        public void onError() {
+            assertTrue(mShouldFail);
+        }
+    }
+
+}