使用BroadCast 使 service 和activity 信息交互

package com.su.testbroadcast;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.widget.TextView;

public class TestBroadCastActivity extends Activity {
private TextView textView;
private ChangeReceiver changeReceiver;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

textView = (TextView) findViewById(R.id.textView1);
registerBroadcast();

Intent service = new Intent(TestBroadCastActivity.this, MyService.class);
startService(service);

}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(changeReceiver);//解除接受者
}

/**
*  为BroadcastReceiver指定action，使之用于接收同action的广播
*/
private void registerBroadcast() {

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("com.su.testbroadcast");
changeReceiver = new ChangeReceiver();
registerReceiver(changeReceiver, intentFilter);
}

public class ChangeReceiver extends BroadcastReceiver {//实现接受者

@Override
public void onReceive(Context context, Intent intent) {
String title = intent.getStringExtra("msg");
textView.setText(title);

}

}

}

package com.su.testbroadcast;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service {

@Override
public void onCreate() {
super.onCreate();
//發送廣播
Intent intent = new Intent("com.su.testbroadcast");
intent.putExtra("msg", "msg from service");
sendBroadcast(intent);
}

@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}

}