绑定本地Service并与之通信

绑定Service需要调用

public boolean bindService (Intent service, ServiceConnection conn, int flags)；

传入一个ServiceConnection 对象，该对象是一个接口，实例化时需要实现该接口，它的作用就是获得Service的IBinder对象，通过IBinder对象可以实现与Service的通信。

Service的的代码：

 package com.example.servicetest;

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

 public class BindServiceTest extends Service {
     private int count = 0;
     private boolean quit = false;
     private MyBinder mBinder = new MyBinder();

     public class MyBinder extends Binder {
         public int count() {
             return count;
         }
     }

     @Override
     public IBinder onBind(Intent arg0) {
         Log.i("csx", "onBind");
         return mBinder;
     }

     @Override
     public void onCreate() {

         super.onCreate();
         Log.i("csx", "onCreate");
         new Thread() {

             @Override
             public void run() {
                 while (!quit) {
                     try {
                         Thread.sleep(1000);
                     } catch (InterruptedException e) {

                         e.printStackTrace();
                     }
                     count++;

                 }

             }

         }.start();
     }

     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         Log.i("csx", "onStartCommand");
         return START_STICKY;
     }

     @Override
     public boolean onUnbind(Intent intent) {
         Log.i("csx", "onUnbind");
         return true;
     }

     @Override
     public void onDestroy() {
         super.onDestroy();
         this.quit = true;
         Log.i("csx", "onDestroy");
     }

 }

组件的代码：

 package com.example.servicetest;

 import com.example.servicetest.BindServiceTest.MyBinder;

 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.support.v7.app.ActionBarActivity;
 import android.util.Log;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.Toast;

 public class MainActivity extends ActionBarActivity {
     public static final String SERVICE_ACTION = "com.example.servicetest.BindServiceTest";
     Button bindButton, unbindButton, stateButton;
     ServiceConnection conn;
     BindServiceTest.MyBinder mBinder;
     boolean isBind = false;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         bindButton = (Button) findViewById(R.id.button_bind);
         unbindButton = (Button) findViewById(R.id.button_unbind);
         stateButton = (Button) findViewById(R.id.button_get_state);

         conn = new ServiceConnection() {

             @Override
             public void onServiceConnected(ComponentName name, IBinder service) {
                 Log.i("csx", "onServiceConnected");
                 mBinder = (MyBinder) service; // 连接service之后将service中实现的Binder返回给本地声明的Binder

             }

             @Override
             public void onServiceDisconnected(ComponentName name) {
                 Log.i("csx", "onServiceDisconnected");// 意外断开连接会调用该函数

             }

         };

         bindButton.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 Intent service = new Intent();
                 service.setAction(SERVICE_ACTION);
                 bindService(service, conn, BIND_AUTO_CREATE);// 绑定服务
                 isBind = true;

             }
         });

         unbindButton.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 if (!isBind) {
                     Toast.makeText(MainActivity.this, "请先绑定服务", Toast.LENGTH_SHORT).show();
                     return;

                 }

                 unbindService(conn);// 解除绑定服务
                 isBind = false;

             }
         });

         stateButton.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 if (!isBind) {
                     Toast.makeText(MainActivity.this, "请先绑定服务", Toast.LENGTH_SHORT).show();
                     return;

                 }
                 Toast.makeText(MainActivity.this, "" + mBinder.count(), Toast.LENGTH_SHORT).show();// 通过mBinder获取service内部的数据

             }
         });

     }
 }