如何在Kitkat(4.4)中后台识别应用程序? [英] How to identify app when it goes in background in Kitkat (4.4)?

问题描述

我试图在后台运行时检测应用程序.一切正常，但在New Android Version 4.4(Kitkat)中不起作用.我无法找到Kitkat的问题.它总是返回false.

I am trying to detect app when it goes in background. Everything works perfect but in New Android Version 4.4(Kitkat) its not working. I am unable to find out what's the issue with Kitkat. It always returns false.

public static boolean inBackground(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;
}

推荐答案

我遇到了同样的问题.解决方法是在onStop()上调用此方法.

I'm having the same problem. The solution is to call this method on onStop().

为简化起见，我将需要检测应用何时进入后台的活动"扩展到下面的类.

To simplify, I extend the Activities where I need to detect when app goes to background to class below.

public abstract class MyActivity extends Activity {

    @Override
    public void onStop() {

        super.onStop();

        if (isApplicationSentToBackground(this)){

            // handle app going into background here
        }
    }

    private 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;
    }
}

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