如何检测应用程序是否关闭

问题描述

我有一个应用程序，当我的应用程序在获取时运行时，它会从Broadcastreceiver接收以从web(json)获取新数据；一切运行良好，当应用程序关闭时，它崩溃了您的应用程序停止工作".即使以下检查我的应用程序是否在前台的商品也无法正常工作.我想要它，如果该应用程序是关闭的而不是正在运行，则调用它来打开应用程序以使其不会崩溃，那么如何检查应用程序是否已关闭?

I have an app that receives from the Broadcastreceiver to fetch new data from the web(json), when my app is running while it fetches; everything runs well, when the app is closed it crashes "Your app stopped working". Even the following good to check if my app is in the foreground doesn't work.i want it so if the app is closed, not running, to call an intent to open the app for it not to crash, so how do I check if application is closed?

我的代码；

public class UpdateReceiver extends BroadcastReceiver {

private static long alarmTime = 0;

@Override
public void onReceive(Context context, Intent intent) {



    if (isAppForground(context)){
        Toast.makeText(context, "APP IN FOREGROUND", Toast.LENGTH_LONG).show();
    } else {
        Intent intentActivity = new Intent(context, MainActivity.class);
        intentActivity.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intentActivity);
        Toast.makeText(context, "APP NOT RUNNING", Toast.LENGTH_LONG).show();
    }

    //set new alarm for next tuesday
    UpcomingFragment.getInstance().setAlarm(-1);
    //updates the current json
    UpcomingFragment.getInstance().update();


}

public static long getAlermTimeInMillis(){
    return alarmTime;
}

public boolean isAppForground(Context mContext) {

    ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
        ComponentName topActivity = tasks.get(0).topActivity;
        if (!topActivity.getPackageName().equals(mContext.getPackageName())) {
            return false;
        }
    }

    return true;
}

}

推荐答案

我遇到了完全相同的问题，并且在天时被卡住了.幸运的是，在第3天，我找到了一个可行的解决方案.

I had the exact same question , and I was stuck on it for days. Luckily, on day 3, I found a solution that works.

public void onTrimMemory(final int level) {
    if (level == ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
        //SCREEN IS NOT SHOWING
}

此onTrimMemory方法非常有用.应该使用它来优化您的内存中的应用程序，但是我们也可以像这样利用它来发挥我们的优势！

This onTrimMemory method is extremely useful. It is supposed to be used to optimize your app in memory, but we can use it to our advantage like this also!

这篇关于如何检测应用程序是否关闭的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！