以下是ativity_main.xml:
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:orientation="vertical">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="点击这里开始绑定service"/>
<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
以下是服务的java代码：
package com.example.test_service_messenger;
import android.app.Service;
import android.os.Handler;
import android.os.Message;
import android.os.Messenger;
import android.os.IBinder;
import android.content.Intent;
public class SelfService extends Service
{
class SelfHandler extends Handler
{
public void handleMessage(Message msg)
{
if(msg.what==101)
{ System.out.println("收到了客户端发来的消息");
Message msgReply=Message.obtain(msg);
msgReply.what=102;
try{
msg.replyTo.send(msgReply);
System.out.println("已发送");}
catch(Exception e){
e.printStackTrace();
}
}
}
}
Messenger messenger=new Messenger(new SelfHandler());
public IBinder onBind(Intent intent)
{
return messenger.getBinder();
}
}
以下是客户端mainActivity.java的代码：
package com.example.test_service_messenger;
import android.os.Bundle;
import android.widget.*;
import android.app.Activity;
import android.view.Menu;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.Handler;
import android.os.Message;
import android.os.Messenger;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.ComponentName;
import android.os.IBinder;
import android.content.Intent;
import android.content.Context;
public class MainActivity extends Activity {
Intent intent=new Intent();
Button but=null;
TextView textview=null;
Messenger messenger=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intent.setClass(MainActivity.this,SelfService.class);
but=(Button)super.findViewById(R.id.button);
textview=(TextView)super.findViewById(R.id.textview);
but.setOnClickListener(new OnClickListenerimpl());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
ServiceConnection connection=new ServiceConnection()
{
public void onServiceConnected(ComponentName arg1,IBinder binder)
{
messenger=new Messenger(binder);
}
public void onServiceDisconnected(ComponentName arg1)
{
}
};
Handler handler=new Handler()
{
public void handleMessage(Message msg)
{
if(msg.what==102)
{
System.out.println("接收到了服务传回来的消息");
MainActivity.this.textview.setText("接收到了服务传回的消息");
}
}
};
Messenger messenger1 =new Messenger(handler);
class OnClickListenerimpl implements OnClickListener
{
public void onClick(View v)
{
bindService(intent,connection,Context.BIND_AUTO_CREATE);
Message message=Message.obtain();
message.what=101;
message.replyTo=messenger;
try{messenger.send(message);}
catch(Exception e)
{
e.printStackTrace();
}
}
}
}
以下是logcat:
从logcat中可看出，服务已接收到了客户端发来的消息，并已经发回了消息，但是服务那边收不到服务发回来的消息？请问这个应该怎么解决？
另外我还想问问，多个线程或进程间互发消息，线程或进程发消息是怎样设定发往哪里的？又是怎样知道是发给自己的？是广播，然后让what相等的其他线程，进程知道是发给自己的，还是怎样？顺便希望大家能指导指导一下这个问题。
