Add high power whitelist for apps

- Strings not final!
 - New UX for power usage details (more preferency)
 - Add high power apps list shows on/off and screen to
   change (when possible)
 - Link from power usage summary to high power list
 - Link from advanced apps to high power list

Bug: 19991702
Change-Id: I97c927ed82d3b89041e4429b427508545763d66c

src/com/android/settings/fuelgauge/PowerWhitelistBackend.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2015 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.fuelgauge;
+
+import android.os.IDeviceIdleController;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.util.ArraySet;
+import android.util.Log;
+
+
+/**
+ * Handles getting/changing the whitelist for the exceptions to battery saving features.
+ */
+public class PowerWhitelistBackend {
+
+    private static final String TAG = "PowerWhitelistBackend";
+
+    private static final String DEVICE_IDLE_SERVICE = "deviceidle";
+
+    private static final PowerWhitelistBackend INSTANCE = new PowerWhitelistBackend();
+
+    private final IDeviceIdleController mDeviceIdleService;
+    private final ArraySet<String> mWhitelistedApps = new ArraySet<>();
+    private final ArraySet<String> mSysWhitelistedApps = new ArraySet<>();
+
+    public PowerWhitelistBackend() {
+        mDeviceIdleService = IDeviceIdleController.Stub.asInterface(
+                ServiceManager.getService(DEVICE_IDLE_SERVICE));
+        refreshList();
+    }
+
+    public int getWhitelistSize() {
+        return mWhitelistedApps.size();
+    }
+
+    public boolean isSysWhitelisted(String pkg) {
+        return mSysWhitelistedApps.contains(pkg);
+    }
+
+    public boolean isWhitelisted(String pkg) {
+        return mWhitelistedApps.contains(pkg);
+    }
+
+    public void addApp(String pkg) {
+        try {
+            mDeviceIdleService.addPowerSaveWhitelistApp(pkg);
+            mWhitelistedApps.add(pkg);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Unable to reach IDeviceIdleController", e);
+        }
+    }
+
+    public void removeApp(String pkg) {
+        try {
+            mDeviceIdleService.removePowerSaveWhitelistApp(pkg);
+            mWhitelistedApps.remove(pkg);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Unable to reach IDeviceIdleController", e);
+        }
+    }
+
+    private void refreshList() {
+        mSysWhitelistedApps.clear();
+        mWhitelistedApps.clear();
+        try {
+            String[] whitelistedApps = mDeviceIdleService.getFullPowerWhitelist();
+            for (String app : whitelistedApps) {
+                mWhitelistedApps.add(app);
+            }
+            String[] sysWhitelistedApps = mDeviceIdleService.getSystemPowerWhitelist();
+            for (String app : sysWhitelistedApps) {
+                mSysWhitelistedApps.add(app);
+            }
+        } catch (RemoteException e) {
+            Log.w(TAG, "Unable to reach IDeviceIdleController", e);
+        }
+    }
+
+    public static PowerWhitelistBackend getInstance() {
+        return INSTANCE;
+    }
+
+}