Android判断程序前后台状态
16lz
2021-01-26
public class AppStatusService extends Service { private static final String TAG = "AppStatusService"; private ActivityManager activityManager; private String packageName; @Override public IBinder onBind(Intent intent) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { activityManager = (ActivityManager) this.getSystemService(Context.ACTIVITY_SERVICE); packageName = this.getPackageName(); new Thread() { public void run() { try { while (true) { Thread.sleep(1000); if (isAppOnForeground()) { Log.i(TAG, "true"); } else { Log.i(TAG, "false"); } } } catch (Exception e) { e.printStackTrace(); } } }.start(); return super.onStartCommand(intent, flags, startId); } private boolean isAppOnForeground() { // Returns a list of application processes that are running on the device List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses(); if (appProcesses == null) return false; for (RunningAppProcessInfo appProcess : appProcesses) { // importance: // The relative importance level that the system places // on this process. // May be one of IMPORTANCE_FOREGROUND, IMPORTANCE_VISIBLE, // IMPORTANCE_SERVICE, IMPORTANCE_BACKGROUND, or IMPORTANCE_EMPTY. // These constants are numbered so that "more important" values are // always smaller than "less important" values. // processName: // The name of the process that this object is associated with. if (appProcess.processName.equals(packageName) && appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) { return true; } } return false; } }
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