Android 判断app是否在前台运行

<!-- 前台还是后台 -->

<uses-permission android:name="android.permission.GET_TASKS" />

 1 private boolean isForeground(Context context) {

 2         ActivityManager am = (ActivityManager) context

 3                 .getSystemService(Context.ACTIVITY_SERVICE);

 4         ComponentName cn = am.getRunningTasks(1).get(0).topActivity;

 5         String currentPackageName = cn.getPackageName();

 6         if (!TextUtils.isEmpty(currentPackageName)

 7                 && currentPackageName.equals(context.getPackageName())) {

 8             Log.i("yy", "处于前台");

 9             return true;

10         }

11         Log.i("yy", "处于后台");

12         return false;

13     }