Create an overlay to add a photo and video deletion helper service.

This overlay defines a checkbox preference in the deletion helper for
facilitating the deletion of photos and videos. The service which
provides deletion clearing can be overridden and used to create a
custom photo and video deletion helper.

Bug: 28554187
Bug: 28560856

Change-Id: Id5d9671a307aaac0d1331f055b8f2ab7aa67977c

res/values/strings.xml

@@ -7576,4 +7576,11 @@
 
     <!-- Message for telling the user the kind of BT device being displayed in list. -->
     <string name="bluetooth_talkback_bluetooth">Bluetooth</string>
+
+    <!-- Preference group title for the photos and videos deletion service. [CHAR LIMIT=40]-->
+    <string name="deletion_helper_photos_title">Photos &amp; Videos (<xliff:g id="num_items">%1$d</xliff:g>)</string>
+
+    <!-- Summary of how much backed up storage that photos and videos service can clear from the local device. [CHAR LIMIT=NONE]-->
+    <string name="deletion_helper_photos_summary"><xliff:g id="used" example="1.2GB">%1$s</xliff:g>, older than <xliff:g id="days">%2$d</xliff:g> days</string>
+
 </resources>

res/xml/deletion_helper_list.xml

@@ -17,6 +17,9 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
                   android:title="@string/deletion_helper_title">
 
+    <com.android.settings.PhotosDeletionPreference
+        android:key="delete_photos" />
+
     <PreferenceCategory
             android:key="apps_group"
             android:title="@string/deletion_helper_apps_title" />

src/com/android/settings/PhotosDeletionPreference.java

@@ -0,0 +1,143 @@
+/*
+ * 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;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.drawable.Drawable;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.Preference.OnPreferenceChangeListener;
+import android.support.v7.preference.CheckBoxPreference;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.util.AttributeSet;
+import android.util.TypedValue;
+import android.text.format.Formatter;
+import android.widget.TextView;
+import com.android.settings.deletionhelper.DeletionType;
+
+/**
+ * Preference to handle the deletion of photos and videos in the Deletion Helper.
+ */
+public class PhotosDeletionPreference extends CheckBoxPreference implements
+        DeletionType.FreeableChangedListener, OnPreferenceChangeListener {
+    // TODO(b/28560570): Remove this dummy value.
+    private static final int FAKE_DAYS_TO_KEEP = 30;
+    private DeletionType.FreeableChangedListener mListener;
+    private boolean mChecked;
+    private long mFreeableBytes;
+    private int mFreeableItems;
+    private DeletionType mDeletionService;
+
+    public PhotosDeletionPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setIcon(getIcon(context));
+        updatePreferenceText();
+        setOnPreferenceChangeListener(this);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        final TextView titleView = (TextView) holder.findViewById(android.R.id.title);
+        if (titleView != null) {
+            titleView.setTextColor(getTintColor(getContext()));
+        }
+    }
+
+    /**
+     * Get the tint color for the preference's icon and text.
+     * @param context UI context to get the theme.
+     * @return The tint color.
+     */
+    public int getTintColor(Context context) {
+        TypedValue value = new TypedValue();
+        context.getTheme().resolveAttribute(android.R.attr.colorAccent, value, true);
+        return context.getColor(value.resourceId);
+    }
+
+    /**
+     * Updates the title and summary of the preference with fresh information.
+     */
+    public void updatePreferenceText() {
+        Context context = getContext();
+        setTitle(context.getString(R.string.deletion_helper_photos_title,
+                mFreeableItems));
+        setSummary(context.getString(R.string.deletion_helper_photos_summary,
+                Formatter.formatFileSize(context, mFreeableBytes), FAKE_DAYS_TO_KEEP));
+    }
+
+    /**
+     * Returns the number of bytes which can be cleared by the deletion service.
+     * @return The number of bytes.
+     */
+    public long getFreeableBytes() {
+        return mChecked ? mFreeableBytes : 0;
+    }
+
+    /**
+     * Register a listener to be called back on when the freeable bytes have changed.
+     * @param listener The callback listener.
+     */
+    public void registerFreeableChangedListener(DeletionType.FreeableChangedListener listener) {
+        mListener = listener;
+    }
+
+    /**
+     * Registers a deletion service to update the preference's information.
+     * @param deletionService A photo/video deletion service.
+     */
+    public void registerDeletionService(DeletionType deletionService) {
+        mDeletionService = deletionService;
+        if (mDeletionService != null) {
+            mDeletionService.registerFreeableChangedListener(this);
+        }
+    }
+
+    @Override
+    public void onFreeableChanged(int numItems, long freeableBytes) {
+        mFreeableItems = numItems;
+        mFreeableBytes = freeableBytes;
+        updatePreferenceText();
+        maybeUpdateListener();
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        mChecked = (boolean) newValue;
+        maybeUpdateListener();
+        return true;
+    }
+
+    private Drawable getIcon(Context context) {
+        final Drawable iconDrawable;
+        try {
+            Resources resources = context.getResources();
+            final int resId = resources.getIdentifier("ic_photos_black_24", "drawable",
+                    context.getPackageName());
+            iconDrawable = context.getDrawable(resId);
+        } catch (Resources.NotFoundException e) {
+            return null;
+        }
+        return iconDrawable;
+    }
+
+    private void maybeUpdateListener() {
+        if (mListener != null) {
+            mListener.onFreeableChanged(mFreeableItems, getFreeableBytes());
+        }
+    }
+}

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

@@ -1,5 +1,22 @@
+/*
+ * 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.Application;
 import android.os.Bundle;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceGroup;
@@ -7,31 +24,28 @@ 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.PhotosDeletionPreference;
 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.settings.overlay.DeletionHelperFeatureProvider;
+import com.android.settings.overlay.FeatureFactory;
 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 {
+        ApplicationsState.Callbacks, AppStateBaseBridge.Callback,
+        Preference.OnPreferenceChangeListener, DeletionType.FreeableChangedListener {
     private static final String TAG = "DeletionHelperFragment";
 
     private static final String EXTRA_HAS_BRIDGE = "hasBridge";
@@ -39,9 +53,11 @@ public class DeletionHelperFragment extends SettingsPreferenceFragment implement
     private static final String EXTRA_CHECKED_SET = "checkedSet";
 
     private static final String KEY_APPS_GROUP = "apps_group";
+    private static final String KEY_PHOTOS_VIDEOS_PREFERENCE = "delete_photos";
 
     private Button mCancel, mFree;
     private PreferenceGroup mApps;
+    private PhotosDeletionPreference mPhotoPreference;
 
     private ApplicationsState mState;
     private Session mSession;
@@ -49,17 +65,26 @@ public class DeletionHelperFragment extends SettingsPreferenceFragment implement
     private AppStateUsageStatsBridge mDataUsageBridge;
     private ArrayList<AppEntry> mAppEntries;
     private boolean mHasReceivedAppEntries, mHasReceivedBridgeCallback, mFinishedLoading;
+    private DeletionHelperFeatureProvider mProvider;
+    private DeletionType mPhotoVideoDeletion;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        mState = ApplicationsState.getInstance(getActivity().getApplication());
+        Application app = getActivity().getApplication();
+        mState = ApplicationsState.getInstance(app);
         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);
+        mPhotoPreference = (PhotosDeletionPreference) findPreference(KEY_PHOTOS_VIDEOS_PREFERENCE);
+        mProvider =
+                FeatureFactory.getFactory(app).getDeletionHelperFeatureProvider();
+        if (mProvider != null) {
+            mPhotoVideoDeletion = mProvider.createPhotoVideoDeletionType();
+        }
 
         if (savedInstanceState != null) {
             mHasReceivedAppEntries =
@@ -86,6 +111,13 @@ public class DeletionHelperFragment extends SettingsPreferenceFragment implement
         mFree.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                // This should be fine as long as there is only one extra deletion feature.
+                // In the future, this should be done in an async queue in order to not interfere
+                // with the simultaneous PackageDeletionTask.
+                if (mPhotoPreference != null && mPhotoPreference.isChecked()) {
+                    mPhotoVideoDeletion.clearFreeableData();
+                }
+
                 ArraySet<String> apps = new ArraySet<>();
                 for (AppEntry entry : mAppEntries) {
                     if (!mUncheckedApplications.contains(entry.label)) {
@@ -113,10 +145,21 @@ public class DeletionHelperFragment extends SettingsPreferenceFragment implement
         });
     }
 
+    private void initializeDeletionPreferences() {
+        if (mProvider == null) {
+            getPreferenceScreen().removePreference(mPhotoPreference);
+            mPhotoPreference = null;
+        } else {
+            mPhotoPreference.registerFreeableChangedListener(this);
+            mPhotoPreference.registerDeletionService(mPhotoVideoDeletion);
+        }
+    }
+
     @Override
     public void onViewCreated(View v, Bundle savedInstanceState) {
         super.onViewCreated(v, savedInstanceState);
         initializeButtons(v);
+        initializeDeletionPreferences();
         setLoading(true, false);
     }
 
@@ -125,6 +168,10 @@ public class DeletionHelperFragment extends SettingsPreferenceFragment implement
         super.onResume();
         mSession.resume();
         mDataUsageBridge.resume();
+
+        if (mPhotoVideoDeletion != null) {
+            mPhotoVideoDeletion.onResume();
+        }
     }
 
 
@@ -142,6 +189,10 @@ public class DeletionHelperFragment extends SettingsPreferenceFragment implement
         super.onPause();
         mDataUsageBridge.pause();
         mSession.pause();
+
+        if (mPhotoVideoDeletion != null) {
+            mPhotoVideoDeletion.onPause();
+        }
     }
 
     private void rebuild() {
@@ -250,16 +301,27 @@ public class DeletionHelperFragment extends SettingsPreferenceFragment implement
         return true;
     }
 
+    @Override
+    public void onFreeableChanged(int numItems, long freeableBytes) {
+        updateFreeButtonText();
+    }
+
     private long getTotalFreeableSpace() {
         long freeableSpace = 0;
-        for (int i = 0; i < mAppEntries.size(); i++) {
-            final AppEntry entry = mAppEntries.get(i);
-            long entrySize = mAppEntries.get(i).size;
-            // If the entrySize is negative, it is either an unknown size or an error occurred.
-            if (!mUncheckedApplications.contains(entry.label) && entrySize > 0) {
-                freeableSpace += entrySize;
+        if (mAppEntries != null) {
+
+            for (int i = 0; i < mAppEntries.size(); i++) {
+                final AppEntry entry = mAppEntries.get(i);
+                long entrySize = mAppEntries.get(i).size;
+                // If the entrySize is negative, it is either an unknown size or an error occurred.
+                if (!mUncheckedApplications.contains(entry.label) && entrySize > 0) {
+                    freeableSpace += entrySize;
+                }
             }
         }
+        if (mPhotoPreference != null) {
+            freeableSpace += mPhotoPreference.getFreeableBytes();
+        }
         return freeableSpace;
     }
 }

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

@@ -0,0 +1,55 @@
+/*
+ * 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.v7.preference.PreferenceGroup;
+import android.support.v7.preference.Preference;
+
+/**
+ * Helper for the Deletion Helper which can query, clear out, and visualize deletable data.
+ * This could represent a helper for deleting photos, downloads, movies, etc.
+ */
+public interface DeletionType {
+    /**
+     * Registers a callback to call when the amount of freeable space is updated.
+     * @param listener A callback.
+     */
+    void registerFreeableChangedListener(FreeableChangedListener listener);
+
+    /**
+     * Resumes an operation, intended to be called when the deletion fragment resumes.
+     */
+    void onResume();
+
+    /**
+     * Pauses the feature's operations, intended to be called when the deletion fragment is paused.
+     */
+    void onPause();
+
+    /**
+     * Asynchronously free up the freeable information for the feature.
+     */
+    void clearFreeableData();
+
+    /**
+     * Callback interface to listen for when a deletion feature's amount of freeable space updates.
+     */
+    interface FreeableChangedListener {
+        void onFreeableChanged(int numItems, long bytesFreeable);
+    }
+}

src/com/android/settings/overlay/DeletionHelperFeatureProvider.java

@@ -0,0 +1,30 @@
+/*
+ * 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.overlay;
+
+import android.support.v7.preference.PreferenceGroup;
+import com.android.settings.deletionhelper.DeletionType;
+
+/**
+ * Feature provider for the manual deletion helper Settings page.
+ */
+public interface DeletionHelperFeatureProvider {
+    /**
+     * Creates a {@link DeletionType} for clearing out stored photos and videos on the device.
+     */
+    DeletionType createPhotoVideoDeletionType();
+}

src/com/android/settings/overlay/FeatureFactory.java

@@ -61,6 +61,11 @@ public abstract class FeatureFactory {
 
     public abstract SupportFeatureProvider getSupportFeatureProvider(Context context);
 
+    /**
+     * Return a provider which adds additional deletion services to the Deletion Helper.
+     */
+    public abstract DeletionHelperFeatureProvider getDeletionHelperFeatureProvider();
+
     public static final class FactoryNotFoundException extends RuntimeException {
         public FactoryNotFoundException(Throwable throwable) {
             super("Unable to create factory. Did you misconfigure Proguard?", throwable);

src/com/android/settings/overlay/FeatureFactoryImpl.java

@@ -28,4 +28,9 @@ public final class FeatureFactoryImpl extends FeatureFactory {
         return null;
     }
 
+    @Override
+    public DeletionHelperFeatureProvider getDeletionHelperFeatureProvider() {
+        return null;
+    }
+
 }