<!-- 前台还是后台 -->

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

 private boolean isForeground(Context context) {

         ActivityManager am = (ActivityManager) context

                 .getSystemService(Context.ACTIVITY_SERVICE);

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

         String currentPackageName = cn.getPackageName();

         if (!TextUtils.isEmpty(currentPackageName)

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

             Log.i("yy", "处于前台");

             return true;

         }

         Log.i("yy", "处于后台");

         return false;

     }