looper prepare循环中Looper.loop;之后，代码不能运行，是怎么回事

循环中Looper.loop;之后，代码不能运行，是怎么回事

import .db.DownDatasTask; import .db.OnDownDatasListener; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; import android.os.Looper; import android.os.Message; import android.provider.Settings.Secure; import android.util.Log; public class MessageService extends Service { private static final String ITEM_MESSAGE = "message"; private static final String ITEM_TITLE = "title"; private static final String ITEM_TIME = "addtime"; //获取消息线程 private Thread mThread = null; //点击查看 //private Intent msgIntent = null; private PendingIntent msgPendingIntent = null; //通知栏消息 private int msgNotificationid = 1000; private Notification msgNotification = null; private NotificationManager msgNotificatiomanager = null; @Override public IBinder onBind(Intent intent) { return null; } @Override public void onStart(Intent intent, int startId) { //初始化 msgNotification = new Notification(); msgNotification.icon = R.drawable.icon1; msgNotification.tickerText = "新消息"; msgNotification.defaults = Notification.DEFAULT_SOUND; msgNotification.flags = Notification.FLAG_AUTO_CANCEL; msgNotificatiomanager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE); //开启线程 MsgThread thread=new MsgThread(); mThread=new Thread(thread); mThread.start(); } // @Override // public void onDestroy() { //// System.exit(0); // super.onDestroy(); // } class MsgThread implements Runnable{ public boolean isrunning = true; public void run() { while(isrunning){ try { //休息1分钟 Thread.sleep(60000); //获取服务器消息 Looper.prepare(); Log.v("测试1", "测试1"); loadPushMessage(); Looper.loop(); Log.v("测试2", "测试2"); } catch (InterruptedException e) { e.printStackTrace(); } } } } private void loadPushMessage(){ String mobileid = Secure.getString(getBaseContext().getContentResolver(), Secure.ANDROID_ID); String string_url = Client3Application.url_getData + getResources().getString(R.string.url_push_msg, mobileid); final DownDatasTask down_datas_task_ = new DownDatasTask(); down_datas_task_.execute(string_url); down_datas_task_.setOnDownDatasListener(new OnDownDatasListener() { @Override public void onDownData() { int count = down_datas_task_.getDataCount(); if (count > 0) { Message msg=new Message(); msg.what=1; String string_msg = down_datas_task_.getData(0, ITEM_MESSAGE).toString(); String string_title = down_datas_task_.getData(0, ITEM_TITLE).toString(); String string_time = down_datas_task_.getData(0, ITEM_TIME).toString(); Bundle data = new Bundle(); data.putString("message", string_msg); data.putString("time", string_time); data.putString("title", string_title); msg.setData(data); mHandler.sendMessage(msg); Log.v("测试3", "测试3"); } down_datas_task_.cancel(true); down_datas_task_.clearData(); } }); } private Handler mHandler=new Handler(){ public void handleMessage(Message msg) { int i = msg.what; if(i > 0){ Bundle data = msg.getData(); String string_msg = data.getString("message"); String string_time = data.getString("time"); String string_title = data.getString("title"); Bundle bundle = new Bundle(); Intent msgIntent = new Intent(); bundle.putString("message", string_msg); bundle.putString("time", string_time); bundle.putString("title", string_title); msgIntent.putExtras(bundle); msgIntent.setClass(MessageService.this, MessageActivity.class); msgPendingIntent = PendingIntent.getActivity(MessageService.this,0,msgIntent,0); //更新通知栏 msgNotification.setLatestEventInfo(MessageService.this,"新消息",string_title,msgPendingIntent); msgNotificatiomanager.notify(msgNotificationid, msgNotification); //每次通知完，通知id递增一下，避免消息覆盖掉 msgNotificationid++; } } }; }