Java Android应用程序自动进入前台

在我的应用程序中，在asyntask结束时调用FirstActivity Asynctask，将打开secondactivity

当asyntask运行时应用程序处于后台时 异步任务完成后，应用程序自动进入前台，无需任何用户交互

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如何避免它？

在启动第二个活动之前，请使用以下方法检查您的应用程序是否处于前台：

public static boolean isApplicationSentToBackground(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;
}

ActivityManager activityManager = (ActivityManager) getApplicationContext()
.getSystemService(Activity.ACTIVITY_SERVICE);
String className = activityManager.getRunningTasks(1).get(0).topActivity
.getClassName();

if (className.equals("your activity class name with package")) {
//ToDO
}

公共静态布尔值isApplicationSentToBackground（最终上下文）{
ActivityManager am=（ActivityManager）context.getSystemService（context.ACTIVITY_服务）；
列表任务=am.getRunningTasks（1）；
如果（！tasks.isEmpty（））{
ComponentName topActivity=tasks.get（0）.topActivity；
如果（！topActivity.getPackageName（）.equals（context.getPackageName（）））{
返回true；
}
}
返回false；
}

检查是否打开了任何活动

    /***
     * Checking Whether any Activity of Application is running or not
     * @param context
     * @return
     */
    public boolean isForeground(Context context) {

        // Get the Activity Manager
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

        // Get a list of running tasks, we are only interested in the last one, 
        // the top most so we give a 1 as parameter so we only get the topmost.
        List< ActivityManager.RunningTaskInfo > task = manager.getRunningTasks(1); 

        // Get the info we need for comparison.
        ComponentName componentInfo = task.get(0).topActivity;

        // Check if it matches our package name.
        if(componentInfo.getPackageName().equals(context.getPackageName())) 
            return true;

        // If not then our app is not on the foreground.
        return false;
    }

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在android中，我们可以发现应用程序位于前台或后台，如下所示：

public static boolean isApplicationSentToBackground(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;
}

ActivityManager activityManager = (ActivityManager) getApplicationContext()
.getSystemService(Activity.ACTIVITY_SERVICE);
String className = activityManager.getRunningTasks(1).get(0).topActivity
.getClassName();

if (className.equals("your activity class name with package")) {
//ToDO
}