访问本地服务里面的方法
2023-04-12
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
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
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