学步园

原理图：

步骤：

调用服务里面的方法：
1 设计一个接口：IStudentQueryService   Student queryStudent(int no);
2 在activity里面进行绑定操作：
  bindService(intent,conn,flag);
3 写一个连接实现类：
    private final class MyServiceConnection implements ServiceConnection{

public void onServiceConnected(ComponentName name, IBinder service) {
// TODO Auto-generated method stub
ibinder = (IStudnetQueryService) service;
}

public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub
conn = null;
ibinder = null;
}
   
    }
4 在activity里面用IStudentQueryService 来接收onServiceConnected(ComponentName name, IBinder service)
  返回过来的IBinder对象。

5 写一个StudentService  extends  Service  ,重写onBind()
  编译一个内部类StudentBinder extends Binder  implements IStudnetQueryService

6  创建StudentBinder的对象，通过onBind()方法返回。
7  在activity通过onBind()返回的对象调用服务里面的方法。

代码如下：

1、main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="学号"
        />
    
    <EditText 
        android:id="@+id/et_no"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        />
    
    <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查询"
        android:onClick="query1"
        />
    
    <TextView  
        android:id="@+id/tv_info"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
    
</LinearLayout>

2、MainActivity

package com.njupt.studentquery1;

import android.os.Bundle;
import android.os.IBinder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

	private EditText et_no;
	private TextView tv_info;
	private MyServiceConnection conn;
	private IStudentQueryService ibinder;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	    
		et_no = (EditText) findViewById(R.id.et_no);
		tv_info = (TextView) findViewById(R.id.tv_info);
		conn = new MyServiceConnection();
		
		Intent intent = new Intent(this,StudentService.class);
		bindService(intent,conn,BIND_AUTO_CREATE);
	}

	private class MyServiceConnection implements ServiceConnection{
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			ibinder = (IStudentQueryService) service;
		}
		
		@Override
		public void onServiceDisconnected(ComponentName name) {
			ibinder = null;
			conn = null;
		}
	}
	
	@Override
	protected void onDestroy() {
		super.onDestroy();
	    
		unbindService(conn);
	}
	
	public void query1(View v){
		String no = et_no.getText().toString();
		Student student = ibinder.queryStudent(Integer.parseInt(no));
		tv_info.setText(student.toString());
		
	}
	@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;
	}

}

3、StudentService

package com.njupt.studentquery1;

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

public class StudentService extends Service {

	private StudentBinder ibinder = new StudentBinder();
	private Student[] students = new Student[]{
		new Student(1,"章泽天",21),
		new Student(2,"刘诗诗",22),
		new Student(3,"allen",21)
	};
	
	@Override
	public IBinder onBind(Intent intent) {
		return ibinder;
	}
	
	private class StudentBinder extends Binder implements IStudentQueryService{
		public Student queryStudent(int no){
			return query(no);
		}
	}

	public Student query(int no){
		return students[no - 1];
	}
	
}

4、IStudentQueryService

package com.njupt.studentquery1;

public interface IStudentQueryService {

	public Student queryStudent(int no);
}

5、Student

package com.njupt.studentquery1;

public class Student {

	private int id;
	private String name;
	private int age;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Student(int id, String name, int age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	public Student() {
		super();
	}
	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
	
	
}

6、AndroidManifest.xml

记得在清单文件中吧service 给注册上去

<service android:name="com.njupt.studentquery1.StudentService"/>