此文是自己学习bindService的笔记
模拟一个进度条

先贴代码

定义接口， 需要和Activity传递数据
public interface  IService {   
  int getProgress();
}

定义服务
public class MyService extends Service implements IService {    
    MyBinder myBinder = new MyBinder();    ;  
    private int progress;    
   class MyBinder extends Binder implements IService {        
      @Override       
     public int getProgress() {        
      return progress;      
      }  
    }    
@Override    
public IBinder onBind(Intent intent) {        
    return myBinder;     
  }    
    @Override    
   public void onCreate() {      
       super.onCreate();       
       new Thread() {            
           @Override           
           public void run() {                
              super.run();               
                while (true) {                    
                    try {                        
                      Thread.sleep(100);                   
                    } catch (InterruptedException e) {                        
                       e.printStackTrace();                    
                    }                   
                   progress++;                    
                   updateView();               //更新数据，通知Activity刷新， 此处通过Handler进行通知
                 }            
              }        
         }.start();    
   }   
   private void updateView() {       
        MainActivity.getMyHandler().sendEmptyMessage(1);    
   }    
   @Override    
   public int onStartCommand(Intent intent, int flags, int startId) {        
       return super.onStartCommand(intent, flags, Service.START_REDELIVER_INTENT);    
   }    
   @Override    
   public void onDestroy() {
           super.onDestroy();   
   }
    @Override    
   public boolean onUnbind(Intent intent) {       
       return super.onUnbind(intent);  
   }    
   @Override    
   public int getProgress() {        
      return progress;    
   }
}

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button mOpen, mClose;
    static ProgressBar myProgress;
    static IService mIservice;
    int i = 0;
    static MyHandle mmyhandler;
    MyService.MyBinder mMyBinder;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mOpen = (Button) findViewById(R.id.open);
        mOpen.setOnClickListener(this);
        mClose = (Button) findViewById(R.id.close);
        mClose.setOnClickListener(this);
        myProgress = (ProgressBar) findViewById(R.id.pb);
        mmyhandler = MyHandle.getInstance();

    }

    public ServiceConnection mServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mIservice = (IService) service; //通过BindService      使mServiceConnection和MyService有连联系  此处 service==MyBinder 因为mMyBinder实现了IService接口 所以可以强行转换为IService，并且也就获得了IServiced的实现。
           // mMyBinder= (MyService.MyBinder) service;
            Toast.makeText(MainActivity.this, "连接成功", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {  //此方法是Service异常销毁时候才会调用的
            Toast.makeText(MainActivity.this, "断开连接", Toast.LENGTH_SHORT).show();
            mServiceConnection = null;

        }
    };

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.open:
                Intent it = new Intent(this, MyService.class);
                bindService(it, mServiceConnection, Service.BIND_AUTO_CREATE);
                break;
            case R.id.close:
                unbindService(mServiceConnection);
                break;
            default:
                break;
        }
    }
 
public static MyHandle getMyHandler() {   //静态方法，为Service和Activity获取同一个Hanlder
        return mmyhandler;
    }
    public static class MyHandle extends Handler {  //使用单例模式

        private static MyHandle myHandler;        

        public static MyHandle getInstance() { 
            if (myHandler == null) {
                myHandler = new MyHandle();
            }
            return myHandler;
        }

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 1) {
                myProgress.setProgress(mIservice.getProgress());
            }
        }
    }

XML
    
    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     android:orientation="vertical"
    tools:context="com.example.administrator.bindservice.MainActivity">

    <ProgressBar
        android:id="@+id/pb"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="0"
        style="?android:attr/progressBarStyleHorizontal"
        />
    <Button
        android:id="@+id/open"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/open" />

    <Button
        android:id="@+id/close"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/close" />
</LinearLayout>