MyService.java
package com.jing.example.nknu_.android_service_messenger1;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.widget.Toast;
/**
* Created by nknu_ on 2016/3/11.
*/
public class MyService extends Service {
//定義Service顯示消息
public static final int MSG_SAY_HELLO=1;
private Messenger replyMessenger;//響應Client的數據，從Service發送的Message給Client端
public MyService(){
}
//處理從Client傳送過來的消息
class IncomingHandler extends Handler {
@Override
public void handleMessage(Message msg){
System.out.println("已進入handleMessage");
super.handleMessage(msg);
if(msg.what==MSG_SAY_HELLO){
Toast.makeText(getApplicationContext(), "-->>Hello world" + msg.obj, Toast.LENGTH_LONG).show();
Message message = Message.obtain();
message.obj="我拿到了消息, 告訴Client";//欲發送告知已拿到消息
replyMessenger = msg.replyTo;//取得傳進來的地點，預備傳回去
try {
replyMessenger.send(message);
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
}
//表示接收從Client發送的Message
final Messenger messenger = new Messenger(new IncomingHandler());
@Override
public IBinder onBind(Intent intent) {
System.out.println("已進入onBind");
return messenger.getBinder();
}
}
MainActivity.java
package com.jing.example.nknu_.android_service_messenger1;
import android.content.ComponentName;
import android.content.Context;
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.support.v7.app.AppCompatActivity;
import android.view.View;
public class MainActivity extends AppCompatActivity {
private boolean mBound;//判斷是否綁定
private Messenger messenger;//聲明信息，用來發送Message到Service
//表示從Service獲取的Message
private Messenger clientMessenger = new Messenger(new Handler(){
@Override
public void handleMessage(Message msg){
super.handleMessage(msg);
System.out.println("--->>獲得Service的響應結果" + msg.obj);
}
});
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
//處理點擊事件
public void sayHello(View view){
System.out.println("已進入sayHello");
if(mBound){
Message message = Message.obtain();
message.what = 1;
message.obj = "jack";
message.replyTo = clientMessenger;
try {
messenger.send(message);//向Service發送消息
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
public ServiceConnection connection = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName arg0) {
System.out.println("已進入onServiceDisconnected");
messenger = null;
mBound = false;
}
@Override
public void onServiceConnected(ComponentName arg0, IBinder binder) {
System.out.println("已進入onServiceConnected");
messenger = new Messenger(binder);
mBound = true;
}
};
@Override
protected void onStart(){
System.out.println("已進入onStart");
super.onStart();
bindService(new Intent(this, MyService.class), connection, Context.BIND_AUTO_CREATE);
}
@Override
protected void onStop(){
System.out.println("已進入onStop");
super.onStop();
if(mBound){
unbindService(connection);
mBound=false;
}
}
}
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.jing.example.nknu_.android_service_messenger1.MainActivity"
tools:showIn="@layout/activity_main">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Say Hello"
android:onClick="sayHello"
android:id="@+id/button"
android:layout_centerHorizontal="true"
android:layout_marginTop="158dp" />
</RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jing.example.nknu_.android_service_messenger1">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".MyService"></service>
</application>
</manifest>