Android开发之bindService()侦听service内部状态

在Android开发之bindService()通信的基础上，实现bindService（）方法侦听service内部状态。

实现侦听service内部状态，使用的是回调机制

1.首先实现一个接口

    public static  interface CallBack{
        void onDataChange(String data);
    }

2.

    private CallBack callBack=null;
    public void setCallBack(CallBack callBack) {
        this.callBack = callBack;
    }
    public CallBack getCallBack() {
        return callBack;
    }

3.

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        running=true;
        new Thread(){
            public void run() {
                int i=0;
                while (running) {
                    i++;
                    String str=i+":"+data;
                    Log.d("learnservice", str);
                    if (callBack!=null) {      
                        callBack.onDataChange(str);           
                    }
                    try {
                        sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            };
        }.start();
    }

4.MyBinder提供方法返回BindService实例。

    public class MyBinder extends Binder{
        public void setData(String data){
            MyService.this.data=data;
        }
        public MyService getService(){
            return MyService.this;
        }
    }

5.

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // TODO Auto-generated method stub
            binder=(MyBinder) service;
            binder.getService().setCallBack(new MyService.CallBack() {
                
                @Override
                public void onDataChange(String data) {
                    // TODO Auto-generated method stub
                    Message msg=new Message();
                    Bundle bundle=new Bundle();
                    bundle.putString("data", data);
                    msg.setData(bundle);
                    handler.sendMessage(msg);
                }
            });
        }
    };

6.通过handler，把data放到UI线程，并更新UI线程

    private Handler handler=new Handler(){
        public void handleMessage(android.os.Message msg) {
            tvOut.setText(msg.getData().getString("data"));
        };
    };