Android判斷當前應用程序處於前臺仍是後臺的兩種方法

一、經過RunningTaskInfo類判斷（須要額外權限）：

複製代碼代碼以下:

/**
     *判斷當前應用程序處於前臺仍是後臺
     */
    public static boolean isApplicationBroughtToBackground(final Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> tasks = am.getRunningTasks(1);
        if (!tasks.isEmpty()) {
            ComponentName topActivity = tasks.get(0).topActivity;
            if (!topActivity.getPackageName().equals(context.getPackageName())) {
                return true;
            }
        }
        return false;

    }

須要在AndroidMenitfest.xml文件中添加如下權限

複製代碼代碼以下:

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

二、經過RunningAppProcessInfo類判斷（不須要額外權限）： 

複製代碼代碼以下:

public static boolean isBackground(Context context) {

    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);    List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();    for (RunningAppProcessInfo appProcess : appProcesses) {         if (appProcess.processName.equals(context.getPackageName())) {                if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {                          Log.i("後臺", appProcess.processName);                          return true;                }else{                          Log.i("前臺", appProcess.processName);                          return false;                }           }    }    return false;}