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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.app;
     18 
     19 import android.content.Context;
     20 import android.os.Handler;
     21 import android.os.Looper;
     22 import android.os.Message;
     23 import android.os.RemoteException;
     24 import android.util.SparseArray;
     25 import android.util.SparseIntArray;
     26 
     27 import java.util.List;
     28 
     29 /**
     30  * Helper for monitoring the current importance of applications.
     31  * @hide
     32  */
     33 public class AppImportanceMonitor {
     34     final Context mContext;
     35 
     36     final SparseArray<AppEntry> mApps = new SparseArray<>();
     37 
     38     static class AppEntry {
     39         final int uid;
     40         final SparseArray<Integer> procs = new SparseArray<>(1);
     41         int importance = ActivityManager.RunningAppProcessInfo.IMPORTANCE_GONE;
     42 
     43         AppEntry(int _uid) {
     44             uid = _uid;
     45         }
     46     }
     47 
     48     final IProcessObserver mProcessObserver = new IProcessObserver.Stub() {
     49         @Override
     50         public void onForegroundActivitiesChanged(int pid, int uid, boolean foregroundActivities) {
     51         }
     52 
     53         @Override
     54         public void onProcessStateChanged(int pid, int uid, int procState) {
     55             synchronized (mApps) {
     56                 updateImportanceLocked(pid, uid,
     57                         ActivityManager.RunningAppProcessInfo.procStateToImportance(procState),
     58                         true);
     59             }
     60         }
     61 
     62         @Override
     63         public void onProcessDied(int pid, int uid) {
     64             synchronized (mApps) {
     65                 updateImportanceLocked(pid, uid,
     66                         ActivityManager.RunningAppProcessInfo.IMPORTANCE_GONE, true);
     67             }
     68         }
     69     };
     70 
     71     static final int MSG_UPDATE = 1;
     72 
     73     final Handler mHandler;
     74 
     75     public AppImportanceMonitor(Context context, Looper looper) {
     76         mContext = context;
     77         mHandler = new Handler(looper) {
     78             @Override
     79             public void handleMessage(Message msg) {
     80                 switch (msg.what) {
     81                     case MSG_UPDATE:
     82                         onImportanceChanged(msg.arg1, msg.arg2&0xffff, msg.arg2>>16);
     83                         break;
     84                     default:
     85                         super.handleMessage(msg);
     86                 }
     87             }
     88         };
     89         ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
     90         try {
     91             ActivityManagerNative.getDefault().registerProcessObserver(mProcessObserver);
     92         } catch (RemoteException e) {
     93         }
     94         List<ActivityManager.RunningAppProcessInfo> apps = am.getRunningAppProcesses();
     95         if (apps != null) {
     96             for (int i=0; i<apps.size(); i++) {
     97                 ActivityManager.RunningAppProcessInfo app = apps.get(i);
     98                 updateImportanceLocked(app.uid, app.pid, app.importance, false);
     99             }
    100         }
    101     }
    102 
    103     public int getImportance(int uid) {
    104         AppEntry ent = mApps.get(uid);
    105         if (ent == null) {
    106             return ActivityManager.RunningAppProcessInfo.IMPORTANCE_GONE;
    107         }
    108         return ent.importance;
    109     }
    110 
    111     /**
    112      * Report when an app's importance changed. Called on looper given to constructor.
    113      */
    114     public void onImportanceChanged(int uid, int importance, int oldImportance) {
    115     }
    116 
    117     void updateImportanceLocked(int uid, int pid, int importance, boolean repChange) {
    118         AppEntry ent = mApps.get(uid);
    119         if (ent == null) {
    120             ent = new AppEntry(uid);
    121             mApps.put(uid, ent);
    122         }
    123         if (importance >= ActivityManager.RunningAppProcessInfo.IMPORTANCE_GONE) {
    124             ent.procs.remove(pid);
    125         } else {
    126             ent.procs.put(pid, importance);
    127         }
    128         updateImportanceLocked(ent, repChange);
    129     }
    130 
    131     void updateImportanceLocked(AppEntry ent, boolean repChange) {
    132         int appImp = ActivityManager.RunningAppProcessInfo.IMPORTANCE_GONE;
    133         for (int i=0; i<ent.procs.size(); i++) {
    134             int procImp = ent.procs.valueAt(i);
    135             if (procImp < appImp) {
    136                 appImp = procImp;
    137             }
    138         }
    139         if (appImp != ent.importance) {
    140             int impCode = appImp | (ent.importance<<16);
    141             ent.importance = appImp;
    142             if (appImp >= ActivityManager.RunningAppProcessInfo.IMPORTANCE_GONE) {
    143                 mApps.remove(ent.uid);
    144             }
    145             if (repChange) {
    146                 mHandler.obtainMessage(MSG_UPDATE, ent.uid, impCode).sendToTarget();
    147             }
    148         }
    149     }
    150 }
    151