android BroadcastReceiver 广播 onReceive（）执行多次

功能：下载listView中点击的item数据，

ListView的activity中代码：

@Override

protected void onListItemClick(ListView l, View v, int position, long id) {

Mp3Info mp3Info = this.mp3Infos.get(position);

Intent intent = new Intent();

intent.putExtra("mp3Info", mp3Info);

intent.setClass(this, DownLoadService.class);

this.startService(intent);

receiver=new MyReceiver();

IntentFilter filter=new IntentFilter();

filter.addAction(ConstantVariable.DOWNLOADACTION);

Mp3ListActivity.this.registerReceiver(receiver,filter);

super.onListItemClick(l, v, position, id);

}

class MyReceiver extends BroadcastReceiver {

public MyReceiver(){}

//点几次listview，这里会执行几次

@Override

public void onReceive(Context arg0, Intent intent) {

Bundle bundle=intent.getExtras();

String resultString = bundle.getString("resultString");

System.out.println(resultString);

}

}

service的代码：

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

Mp3Info mp3Info = (Mp3Info) intent.getSerializableExtra("mp3Info");

DownLoadThread downLoadThread = new DownLoadThread(mp3Info);

Thread thread = new Thread(downLoadThread);

thread.start();

return super.onStartCommand(intent, flags, startId);

}

class DownLoadThread implements Runnable {

Mp3Info mp3Info = null;

public DownLoadThread(Mp3Info mp3Info) {

this.mp3Info = mp3Info;

}

@Override

public void run() {

String mp3Url = "";

try {

mp3Url = ConstantVariable.SERVER_URL

+ URLEncoder.encode(mp3Info.getMp3Name(), "UTF-8");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

HttpDownloader httpDownloader = new HttpDownloader();

int result = httpDownloader.downFile(mp3Url, "mp3/",

mp3Info.getMp3Name());

String resultsString = mp3Info.getMp3Name();

if (result == -1) {

resultsString += ",下载失败.";

} else if (result == 0) {

resultsString += ",下载成功.";

} else if (result == 1){

resultsString += ",文件已存在.";

}

Intent intent=new Intent();

intent.putExtra("resultString", resultsString);

intent.setAction(ConstantVariable.DOWNLOADACTION);

sendBroadcast(intent);

}

}

androidmanifest.xml注册service

<service android:name="com.nic.service.DownLoadService"></service>

其他的辅助类就不贴代码了。大家知道为什么会这样吗？

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经过排查发现原因了：

1、不应该在onListItemClick方法里注册receiver，应该在onCreat方法里注册

2、在onListItemClick方法里启动service

2、在onDestroy方法里，注销receiver。