Android自学之路——Service与Activity通信

Posted 2020-06-30

A）MainActivity 类的代码 
1 package com.example.cms.service;
 2 
 3 import android.app.Service;
 4 import android.content.ComponentName;
 5 import android.content.Intent;
 6 import android.content.ServiceConnection;
 7 import android.os.IBinder;
 8 import android.support.v7.app.AppCompatActivity;
 9 import android.os.Bundle;
10 import android.view.View;
11 import android.widget.Button;
12 import android.widget.Toast;
13 
14 public class MainActivity extends AppCompatActivity {
15     private Button bind,unBind,getServiceStatus;
16     BindService.MyBinder binder;
17     private ServiceConnection conn=new ServiceConnection() {
18         @Override
19         public void onServiceConnected(ComponentName name, IBinder service) {//service为Service中的onBinder()方法返回的
20             System.out.println("----Service Connected-----");
21             binder= (BindService.MyBinder) service;
22         }
23         @Override
24         public void onServiceDisconnected(ComponentName name) {
25             System.out.println("----Service Disconnted----");
26         }
27     };
28 
29     @Override
30     protected void onCreate(Bundle savedInstanceState) {
31         super.onCreate(savedInstanceState);
32         setContentView(R.layout.activity_main);
33         bind= (Button) findViewById(R.id.bind);
34         unBind= (Button) findViewById(R.id.unBind);
35         getServiceStatus= (Button) findViewById(R.id.getServiceStatus);
36         final Intent intent=new Intent(this,BindService.class);
37         bind.setOnClickListener(new View.OnClickListener() {
38             @Override
39             public void onClick(View v) {
40                 //绑定指定Service
41                 bindService(intent,conn, Service.BIND_AUTO_CREATE);
42             }
43         });
44         unBind.setOnClickListener(new View.OnClickListener() {
45             @Override
46             public void onClick(View v) {
47                 //接触绑定
48                 unbindService(conn);
49             }
50         });
51         getServiceStatus.setOnClickListener(new View.OnClickListener() {
52             @Override
53             public void onClick(View v) {
54                 Toast.makeText(MainActivity.this,"Service 的 count值为："+binder.getCount(),Toast.LENGTH_SHORT).show();
55             }
56         });
57     }
58 
59 }

B）Service类代码

package com.example.cms.service;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.support.annotation.Nullable;

/**
 * Created by CMS on 2016/3/28.
 */
public class BindService extends Service {
    private int count;
    private boolean quit=false;
    private MyBinder binder=new MyBinder();

    class MyBinder extends Binder{
        public int getCount(){
            return count;
        }
    }
    @Override
    public IBinder onBind(Intent intent) {
        System.out.print("Service is Binded");
        return binder;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        System.out.print("Service is Created");
        new Thread(){
            public void run(){
                while(!quit){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    count++;
                }
            }
        }.start();
    }
    @Override
    public boolean onUnbind(Intent intent) {
        System.out.println("Service is Unbinded");
        return true;
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        this.quit=true;
        System.out.println("Service id Destroyed");
    }
}