Messenger双向通信 使用Messenger实现Service的双向通信
antimage08 人气:0想了解使用Messenger实现Service的双向通信的相关内容吗，antimage08在本文为您仔细讲解Messenger双向通信的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：Messenger,Service,双向通信，下面大家一起来学习吧。
Android体系架构中有一个解决方案：利用Android Messenger实现Service进程间双向通信。
MainActivity 类：
package com.example.messengeservicetest;
import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.text.style.IconMarginSpan;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
private Messenger sender;
private ServiceConnection conn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bind = (Button)findViewById(R.id.bind);
Button start = (Button)findViewById(R.id.start);
Button send = (Button)findViewById(R.id.send);
bind.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
getStart();
}
});
start.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, MessengerService.class);
startService(intent);
}
});
send.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sendCount();
}
});
}
// 用于启动 MessengerService
private void getStart(){
conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
sender = new Messenger(service);
}
};
Intent intent = new Intent(this, MessengerService.class);
// startService(intent);
bindService(intent, conn, Service.BIND_AUTO_CREATE);
}
// 传递数值
private void sendCount(){
Message msg = new Message();
msg.arg1 = 20;
msg.arg2 = 20;
try {
sender.send(msg);
} catch (RemoteException e) {
e.printStackTrace();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
unbindService(conn);
}
}
MessengerService.java 类：
package com.example.messengeservicetest;
import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.util.Log;
public class MessengerService extends Service {
Messenger messenger;
Handler handler;
int a, b;
int sum = 0;
@Override
public IBinder onBind(Intent intent) {
return messenger.getBinder();
}
@Override
public void onCreate() {
super.onCreate();
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
a = msg.arg1;
b = msg.arg2;
}
};
messenger = new Messenger(handler);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
int sum = subSum(a, b);
System.out.println(sum + "");
return super.onStartCommand(intent, flags, startId);
}
private int subSum(int a, int b){
int sum = a + b;
return sum;
}
}
在 AndroidManifest.xml 中注册：
<service android:name=".MessengerService"></service>
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