android简单的聊天demo

package com.dk.demo; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.util.Log; import android.view.View; import android.widget.EditText; import android.widget.TextView; public class DemoActivity extends Activity { public static final String ACTIVITYTAG="tag.of.activity"; public ChatService chatService; private TextView msg; private EditText xie ; public ServiceConnection connection=new ServiceConnection() { @Override public void onServiceDisconnected(ComponentName name) { chatService = null; System.out.println("Service disconnected to activity..."); } @Override public void onServiceConnected(ComponentName name, IBinder service) { chatService=((ChatService.ServiceBinder)service).getService(); System.out.println("Service connected to activity..."); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); msg=(TextView) findViewById(R.id.msg); xie = (EditText)findViewById(R.id.xie); Intent intent=new Intent(this, ChatService.class); bindService(intent, connection, BIND_AUTO_CREATE); registerBroadCast(); } @Override protected void onDestroy() { super.onDestroy(); unbindService(connection); } public void send(View view){ Intent intent=new Intent(ChatService.SERVICETAG); intent.putExtra("msg", xie.getText().toString()); sendBroadcast(intent); } private void registerBroadCast(){ ActivityBroadCast receiver =new ActivityBroadCast(); IntentFilter filter=new IntentFilter(); filter.addAction(ACTIVITYTAG); registerReceiver(receiver, filter); } private class ActivityBroadCast extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { if(intent.getAction().equals(ACTIVITYTAG)){ Log.v("ActivityBroadCast", "onReceive"); String temp=intent.getStringExtra("resultmsg"); msg.setText(temp); } } } }