Android alarmreceiver在检查当前打开或关闭的应用程序时出错

Question

这里是我的代码，我给出了错误发生的注释行（在catch异常中）。有人能帮忙吗？非常感谢。代码：

public class AlarmReceiver extends BroadcastReceiver {

    XMLRPCClient client = null;

    private DBclass db;
    int flagPass = 0;

    @Override
    public void onReceive(Context context, Intent intent) {
        // For our recurring task, we'll just display a message
        try{
            // Create an object to represent the server.
            client = new XMLRPCClient(new URL("...server.php"));

            if(intent.getStringExtra("ID").equalsIgnoreCase("ON")){
                try {
                    int flag = 0;
                    try {
                        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
                        List<ActivityManager.RunningAppProcessInfo> task = am.getRunningAppProcesses();
                        for (int i = 0; i < task.size(); i++) {
                            if (task.get(i).processName.equalsIgnoreCase("com.example.test")) {
                                flag = 1;
                                break;
                            }
                        }
                    }catch (Exception ex){
                        flag = 0;
                    }

                    if(flag == 0){
                        HashMap<String, String> params = new HashMap<String, String>();
                        params.put("COMMAND", "ACON");

                        try {
                            // update buffer
                            client.call("updateDataCommand", params);
                        } catch (XMLRPCException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }
                catch (Exception ex) {
                    // error here, always catched here
                    flagPass = 1;
                }

                if(flagPass == 1){
                    HashMap<String, String> params = new HashMap<String, String>();
                    params.put("COMMAND", "ACON");

                    // program error here (apps forced close), unfortunately...
                    try {
                        // update buffer
                        client.call("updateDataCommand", params);
                    } catch (XMLRPCException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

            }


        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}

下面是错误消息：java.lang.RuntimeException：无法在Android.app.ActivityThread.Handlereceiver（ActivityThread.java:2732)启动接收器Android.os.NetworkonMainThreadException...在android.app.activitythread.main（activitythread.java:5417)...原因：android.os.networkonmainthreadexception在android.os.strictmode$androidBlockGuardPolicy.onNetwork（strictmode.java:1273)在java.net.inetaddress.lookupHostByName（inetaddress.java:431)在java.net.inetaddress.getallbyNameImpl（inetaddress.java:252)

Answer 1

当应用程序尝试在其主线程上执行网络操作时，会引发此异常。在AsyncTask或后台线程中运行代码

@Override
public void onReceive(Context context, Intent intent) {
    new Thread(new Runnable() {
        @Override
        public void run() {
            //put your code here
        }
    }).start();
}