Android判斷當前應用程式處於前台還是後台

1、通過RunningTaskInfo類判斷（需要額外許可權）：

/**     *判斷當前應用程式處於前台還是後台     */    public static boolean isApplicationBroughtToBackground(final Context context) {        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List tasks = am.getRunningTasks(1);        if (!tasks.isEmpty()) {            ComponentName topActivity = tasks.get(0).topActivity;            if (!topActivity.getPackageName().equals(context.getPackageName())) {                return true;            }        }        return false;    }

需要在AndroidMenitfest.xml檔案中添加以下許可權

2、通過RunningAppProcessInfo類判斷（不需要額外許可權）：

public static boolean isBackground(Context context) {    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);    List appProcesses = activityManager.getRunningAppProcesses();    for (RunningAppProcessInfo appProcess : appProcesses) {         if (appProcess.processName.equals(context.getPackageName())) {                if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {                          Log.i("後台", appProcess.processName);                          return true;                }else{                          Log.i("前台", appProcess.processName);                          return false;                }           }    }    return false;}