Android判断App是否在前台运行

Android开发中，有时候需要判断App是否在前台运行。

代码实现如下：

private boolean isRunningForeground (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(getPackageName()))    {        return true ;    }     return false ;}

注意： AndroidManifest.xml中需增加 < uses-permission android:name = “android.permission.GET_TASKS” />

protected static boolean isTopActivity(Activity activity){
       String packageName = "xxxxx";
       ActivityManager activityManager = (ActivityManager) activity.getSystemService(Context.ACTIVITY_SERVICE);
        List tasksInfo = activityManager.getRunningTasks(1);
        if(tasksInfo.size() > 0){
           System.out.println("---------------包名-----------"+tasksInfo.get(0).topActivity.getPackageName());
            //应用程序位于堆栈的顶层
            if(packageName.equals(tasksInfo.get(0).topActivity.getPackageName())){
                return true;
            }
        }
       return false;
   }
需要添加android.permission.GET_TASKS权限

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