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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
      5  * except in compliance with the License. You may obtain a copy of the License at
      6  *
      7  *      http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     11  * KIND, either express or implied. See the License for the specific language governing
     12  * permissions and limitations under the License.
     13  */
     14 
     15 package com.android.settings.fuelgauge;
     16 
     17 import android.app.AppOpsManager;
     18 import android.content.Context;
     19 import android.content.pm.ApplicationInfo;
     20 import android.content.pm.PackageManager;
     21 import android.os.Build;
     22 import android.support.annotation.VisibleForTesting;
     23 import android.support.v14.preference.SwitchPreference;
     24 import android.support.v7.preference.Preference;
     25 import android.util.Log;
     26 
     27 import com.android.settings.R;
     28 import com.android.settings.core.PreferenceController;
     29 
     30 /**
     31  * Controller to control whether an app can run in the background
     32  */
     33 public class BackgroundActivityPreferenceController extends PreferenceController implements
     34         Preference.OnPreferenceChangeListener {
     35 
     36     private static final String TAG = "BgActivityPrefContr";
     37     private static final String KEY_BACKGROUND_ACTIVITY = "background_activity";
     38 
     39     private final PackageManager mPackageManager;
     40     private final AppOpsManager mAppOpsManager;
     41     private final String[] mPackages;
     42     private final int mUid;
     43 
     44     private String mTargetPackage;
     45 
     46     public BackgroundActivityPreferenceController(Context context, int uid) {
     47         super(context);
     48         mPackageManager = context.getPackageManager();
     49         mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
     50         mUid = uid;
     51         mPackages = mPackageManager.getPackagesForUid(mUid);
     52     }
     53 
     54     @Override
     55     public void updateState(Preference preference) {
     56         final int mode = mAppOpsManager
     57                 .checkOpNoThrow(AppOpsManager.OP_RUN_IN_BACKGROUND, mUid, mTargetPackage);
     58         if (mode == AppOpsManager.MODE_ERRORED) {
     59             preference.setEnabled(false);
     60         } else {
     61             final boolean checked = mode != AppOpsManager.MODE_IGNORED;
     62             ((SwitchPreference) preference).setChecked(checked);
     63         }
     64 
     65         updateSummary(preference);
     66     }
     67 
     68     @Override
     69     public boolean isAvailable() {
     70         if (mPackages == null) {
     71             return false;
     72         }
     73         for (final String packageName : mPackages) {
     74             if (isLegacyApp(packageName)) {
     75                 mTargetPackage = packageName;
     76                 return true;
     77             }
     78         }
     79 
     80         return false;
     81     }
     82 
     83     @Override
     84     public String getPreferenceKey() {
     85         return KEY_BACKGROUND_ACTIVITY;
     86     }
     87 
     88     @Override
     89     public boolean onPreferenceChange(Preference preference, Object newValue) {
     90         boolean switchOn = (Boolean) newValue;
     91         mAppOpsManager.setMode(AppOpsManager.OP_RUN_IN_BACKGROUND, mUid, mTargetPackage,
     92                 switchOn ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_IGNORED);
     93 
     94         updateSummary(preference);
     95         return true;
     96     }
     97 
     98     @VisibleForTesting
     99     String getTargetPackage() {
    100         return mTargetPackage;
    101     }
    102 
    103     @VisibleForTesting
    104     boolean isLegacyApp(final String packageName) {
    105         try {
    106             ApplicationInfo info = mPackageManager.getApplicationInfo(packageName,
    107                     PackageManager.GET_META_DATA);
    108 
    109             return info.targetSdkVersion < Build.VERSION_CODES.O;
    110         } catch (PackageManager.NameNotFoundException e) {
    111             Log.e(TAG, "Cannot find package: " + packageName, e);
    112         }
    113 
    114         return false;
    115     }
    116 
    117     @VisibleForTesting
    118     void updateSummary(Preference preference) {
    119         final int mode = mAppOpsManager
    120                 .checkOpNoThrow(AppOpsManager.OP_RUN_IN_BACKGROUND, mUid, mTargetPackage);
    121 
    122         if (mode == AppOpsManager.MODE_ERRORED) {
    123             preference.setSummary(R.string.background_activity_summary_disabled);
    124         } else {
    125             final boolean checked = mode != AppOpsManager.MODE_IGNORED;
    126             preference.setSummary(checked ? R.string.background_activity_summary_on
    127                     : R.string.background_activity_summary_off);
    128         }
    129     }
    130 }
    131