Android判斷目前應用程式處于前台還是背景的兩種方法

1、通過RunningTaskInfo類判斷（需要額外權限）：

複制代碼 代碼如下:

/**
     *判斷目前應用程式處于前台還是背景
     */
    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;
    }
           

需要在AndroidMenitfest.xml檔案中添加以下權限

2、通過RunningAppProcessInfo類判斷（不需要額外權限）：

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("背景", appProcess.processName);
                          return true;
                }else{
                          Log.i("前台", appProcess.processName);
                          return false;
                }
           }
    }
    return false;
}
           

• 推送或者xmpp消息，需要判斷前台和背景運作；根據情況啟動本地推送；
• 收錄到常用工具方法中；