绑定形式Service

主界面：

未绑定Service单击获取Service数据效果：

绑定Service后单击获取Service数据效果

下面看HelloBindService代码：

package com.luohaibotestdemo12;

import android.app.Service;
import android.os.Binder;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;

public class HelloBindService extends Service {
    
    private final IBinder mBinder = new LocalBinder();
    private String BOOKNAME = "Android开发入门与实战第二版";
    
    public class LocalBinder extends Binder{
        //提供一个getService方法，返回当前Service的上下文
        HelloBindService getService(){
            return HelloBindService.this;
        }
    }

    public HelloBindService() {
        // TODO Auto-generated constructor stub
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        //重写onBind方法，使用Toast方法显示成功绑定的信息，并返回Binder对象
        Toast.makeText(this, "成功绑定Service", 1000).show();
        return mBinder;
    }
    @Override
    public boolean onUnbind(Intent intent) {
        // TODO Auto-generated method stub
        //重写onUnbind方法，使用Toast方法显示取消绑定信息
        Toast.makeText(this, "成功取消绑定Service", 1000).show();
        return false;
    }
    public String getBookName(){
        return BOOKNAME;
    }

}

MainActivity代码如下：

package com.luohaibotestdemo12;

import com.luohaibotestdemo12.R.id;








import android.os.Bundle;
import android.os.IBinder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
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 HelloBindService bindService;
    private boolean isBind = false;
    private EditText editText;
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText)findViewById(R.id.editText);
        
        //绑定Service
        Button button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub`
                //如果当前没有绑定，则实例化一个Intent对象，调用bindService方法进行绑定
                //为了让组件和Service建立连接，我们必须提供一个ServiceConnction对象即mConnection
                if (!isBind) {
                    Intent serviceIntent = new Intent(MainActivity.this, HelloBindService.class);
                    bindService(serviceIntent,mConnection,Context.BIND_AUTO_CREATE);
                    isBind = true;
                    
                }
                
            }
        });
        //取消绑定Service
        Button button2 = (Button)findViewById(R.id.button2);
        button2.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (isBind) {
                    isBind = false;
                    //取消绑定
                    unbindService(mConnection);
                    bindService = null;
                }
                
            }
        });
        
        //获取Service数据
        Button button3 = (Button)findViewById(R.id.button3);
        button3.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (bindService == null) {
                    editText.setText("请先绑定服务");
                    return;
                    
                }
                editText.setText(bindService.getBookName());
                
                
            }
        });
        
    }
    
    private ServiceConnection mConnection = new ServiceConnection() {
        
        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub
            bindService = null;
            
        }
        
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // TODO Auto-generated method stub
            //通过IBinder对象得到HelloBinderService对象，得到HelloBInderService之后
            //我们就可以对该类中的进行调用了
            bindService = ((HelloBindService.LocalBinder)service).getService();
            
        }
    };

    @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;
    }

}

布局文件代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="绑定Service"/>
    
    <Button android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="取消绑定Service"/>
    
    <Button android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="获取Service数据"/>
    
    <EditText
        android:id="@+id/editText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

最后要记得在AndroidManifest文件中申明Service

 <service android:name="com.luohaibotestdemo12.HelloBindService"></service>