Android AIDL-Service demo版

AIDL是用来定义两个进程之间的通信接口,语法简单,相当于(类似)java的接口写法:

<1> : AIDL定义接口的源代码必须以.aidl为文件扩展名;

<2> : 数据类型,除了基本类型,String,List,Map,CharSequence之外,其他的都要导入相关包;

实现这种接口的是aidl.exe,这个exe放在android SDK下.

下面给出一个demo:

先写AIDL文件:eclipse工程下直接新建一个文本ICat.aidl文件

package com.example.androidaidlserivcedemo0;

interface ICat{
    String getColor();
    double getWeight();
}

eclipse会自动生成ICat.java类,在gen文件夹下,ICat接口包含一个Stub内部类,该内部类实现了IBinder,ICat两个接口,这个Stub类将会作为远程Service的回调类,实现IBinder,因此可作为Service的onBind()方法的返回值.

Service子类如下:

package com.example.androidaidlserivcedemo0;

import java.util.Timer;
import java.util.TimerTask;

import com.example.androidaidlserivcedemo0.ICat.Stub;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;

public class AIDLSerivce extends Service{

    private final String TAG="AIDLSerivce";
    
    private CatBinder catBinder;
    Timer timer=new Timer();
    String[] colors=new String[]{
            "red",
            "yellow",
            "black"
    };
    double[] weights=new double[]{
            2.3,
            3.1,
            1.58
    };
    private String color;
    private double weight;
    
    public class CatBinder extends Stub{//此处不再是继承Binder,而是继承即实现ICat和IBinder的接口

        @Override
        public String getColor() throws RemoteException {
            // TODO Auto-generated method stub
            return color;
        }

        @Override
        public double getWeight() throws RemoteException {
            // TODO Auto-generated method stub
            return weight;
        }
        
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        /**
         * 返回catBinder对象
         * 在绑定本地Service的情况下,该catBinder对象会直接传给客户端的ServiceConnection对象
         * 的第二个参数
         * 在绑定远程Service的情况下,只将catBinder对象的代理
         * 传给客户端的ServiceConnection对象
         * 的OnServiceConnection方法的第二个参数
         */
        return catBinder;
    }
    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        catBinder=new CatBinder();
        timer.schedule(new TimerTask(){

            @Override
            public void run() {
                // TODO Auto-generated method stub
                int rand=(int)(Math.random()*3);
                color=colors[rand];
                weight=weights[rand];
                Log.i(TAG,"rand : " + rand);
            }
            
        }, 0,800);
        
        
    }
    
    
    

}

主类:

package com.example.androidaidlserivcedemo0;

import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

    private EditText mColorText,mWeightText;
    private ICat catService;
    private Button mServiceButton;
    
    private ServiceConnection conn=new ServiceConnection(){

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // TODO Auto-generated method stub
            catService=ICat.Stub.asInterface(service);
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub
            catService=null;
        }
        
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mServiceButton=(Button)findViewById(R.id.button1);
        mColorText=(EditText)findViewById(R.id.editText1);
        mWeightText=(EditText)findViewById(R.id.editText2);
        
        Intent intent=new Intent();
        intent.setAction("com.example.androidaidlserivcedemo0.AIDL_SERVICE");
        bindService(intent,conn,Service.BIND_AUTO_CREATE);
        
        mServiceButton.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                try {
                    mColorText.setText(catService.getColor());
                    mWeightText.setText(catService.getWeight()+"");
                } catch (RemoteException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
            }
            
        });
        
    }

    
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        this.unbindService(conn);
    }


    @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;
    }

}

布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_alignParentTop="true"
        android:layout_marginTop="22dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/editText1"
        android:layout_marginLeft="61dp"
        android:layout_marginTop="96dp"
        android:text="service status" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="34dp"
        android:ems="10" />

</RelativeLayout>

效果图: