如何在应用程序从后台被杀死时清除本地通知

Question

我想在后台滑动关闭应用时清除本地通知。我尝试使用 isAppIsInBackground 方法，但它不起作用。下面是我的代码：-

public static boolean isAppIsInBackground(Context context) {
        boolean isInBackground = true;
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT_WATCH) {
            List<ActivityManager.RunningAppProcessInfo> runningProcesses = am.getRunningAppProcesses();
            for (ActivityManager.RunningAppProcessInfo processInfo : runningProcesses) {
                if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                    for (String activeProcess : processInfo.pkgList) {
                        if (activeProcess.equals(context.getPackageName())) {
                            isInBackground = false;
                        }
                    }
                }
            }
        } else {
            List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
            ComponentName componentInfo = taskInfo.get(0).topActivity;
            if (componentInfo.getPackageName().equals(context.getPackageName())) {
                isInBackground = false;
            }
        }

        return isInBackground;
    }

提前致谢。

Answer 1

要检查您的应用是否在后台运行，请按以下步骤操作。

首先，请确保您有一个扩展 class android.app.Application 的 class XXApplication，如果没有，则创建一个。

其次，创建一个classLifeCycleCallback

class LifeCycleCallback implements ActivityLifecycleCallbacks{

   @Override
   public void onActivityCreated(Activity activity, Bundle savedInstanceState) {

   }
   @SuppressLint("CheckResult")
   @Override
   public void onActivityStarted(Activity activity) {
       isBackground = false;           
   }

   @Override
   public void onActivityResumed(Activity activity) {

   }

   @Override
   public void onActivityPaused(Activity activity) {

   }

   @Override
   public void onActivityStopped(Activity activity) {
       isBackground = true;
   }

   @Override
   public void onActivitySaveInstanceState(Activity activity, Bundle outState) {

   }

   @Override
   public void onActivityDestroyed(Activity activity) {

   }
}

第三，在XXApplicationclass

中添加一个变量isBackground

最后，在 XXApplication 中调用 registerActivityLifecycleCallbacks(new LifeCycleCallback());

好了，现在你可以通过变量isBackground.

判断你的应用是否处于后台

有任何问题请联系我

如何在应用程序从后台被杀死时清除本地通知

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