1.界面设计

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="绑定" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="解除绑定" />

    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="获取服务状态" />
</LinearLayout>

 2.2．创建 Service 的子类

创建一个 Service 的子类 MyService ，该类负责实现 OnBind (）方法、 onCreate (）方法 onUnbind （方法、 onDestoryO 方法。另外需要创建一个内部类继承自 Binder ，负责实现通信。

public class MyService extends Service {
    private int count;
    private boolean stop;
    private MyBinder binder=new MyBinder();
    public class MyBinder extends Binder{
        public int getCount(){
            return count;
        }
    }
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.v("MyService","绑定服务成功");
        return binder;
    }
    @Override
    public void onCreate(){
        super.onCreate();
        Log.v("MyService","服务创建成功");
        new Thread() {
            @Override
            public void run() {
                while(!stop){
                    try{
                        Thread.sleep(1000);
                    }catch (Exception e){
                        e.printStackTrace();
                    }
                    count++;
                }
            }
        }.start();
    }
    @Override
    public boolean onUnbind(Intent intent){
        Log.v("MyService","服务解除绑定");
        return true;
    }
    @Override
    public void onDestroy(){
        super.onDestroy();
        this.stop=true;
        Log.v("MyService","服务解除");
    }
}

3.编写界面交互代码（MainActivity）

public class MainActivity extends Activity  implements View.OnClickListener{
    private Button btn,btn2,btn3;
    private MyService.MyBinder myBinder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout);
        init();
    }

    private void init() {
        btn=(Button)findViewById(R.id.button);
        btn2=(Button)findViewById(R.id.button2);
        btn3=(Button)findViewById(R.id.button3);
        btn.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
    }

    private ServiceConnection connection=new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder iBinder) {
            Log.v("MainActivity","服务连接成功");
            myBinder=(MyService.MyBinder)iBinder;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.v("MainActivity","服务断开连接");
        }
    };
    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.button:
                Intent intent=new Intent(this,MyService.class);
                bindService(intent,connection,BIND_AUTO_CREATE);
                //Toast.makeText(this,"绑定成功",Toast.LENGTH_SHORT).show();
                break;
            case R.id.button2:
                unbindService(connection);
                //Toast.makeText(this,"解除绑定成功",Toast.LENGTH_SHORT).show();
                break;
            case R.id.button3:
                Toast.makeText(this,"获取服务状态成功"+myBinder.getCount(),Toast.LENGTH_SHORT).show();
                break;
            default:
                break;
        }
    }
}

4.注册Service

 <service android:name=".MyService"/>

5.结果展示

             

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