android广播接收器检测应用程序在后台更改

Question

Is there anyway to capture when other application goes into background? Any broadcast receiver we can register to receive that event?

Answer 1

出于明显的隐私原因，没有关于前往或离开前台的活动的广播Intent 。

Answer 2

You can write a backgroung service that periodically monitors the running services and if a new service comes up raises a flag. Use this to get the list of running services:

    public List<String> getRunningServices(Context context){
        ActivityManager activityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningServiceInfo> serviceList = activityManager
                .getRunningServices(Integer.MAX_VALUE);
        List<String> rServices = new ArrayList<String>();
        for (int i = 0; i < serviceList.size(); i++) {
            RunningServiceInfo serviceInfo = serviceList.get(i);
            ComponentName serviceName = serviceInfo.service;            
            rServices.add(serviceName.getClassName());      
        }
        return rServices;
   }