Binder實現Service與Activity通信

Service端代碼：

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
public class PrintService extends Service {
    public PrintService() {
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
//        throw new UnsupportedOperationException("Not yet implemented");
        return myBinder;
    }
    MyThread myThread;
    @Override
    public void onCreate() {
        super.onCreate();
        myThread = new MyThread();
        myThread.start();
    }
    long sysTS,sensorTS;

    class MyThread extends Thread{
        @Override
        public void run() {
            super.run();
            while (true){
                sysTS = System.currentTimeMillis();
                try {
                    sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        }
    }

    //    Service端：
//  1. Service內 創建一個Binder子類MyBinder類，完成一些操作
//	2. Service內實例化一個MyBinder類對象 mBinder;
//  Service的方法public Ibinder onBind(Intent intent) 返回實例化的mBinder對象；
    private MyBinder myBinder = new MyBinder();
    class MyBinder extends Binder{
        public long getSysTS(){
            return sysTS;
        }
    }

}


Activity端：
public class MainActivity extends AppCompatActivity {

    boolean mFlag = true;
    TextView mTvShow ;

//	1. 聲明一個Service裏的自定義的Binder子類的變量 myBinder；
//            2. 實例化ServiceConnection對象 myServiceConnection，並重寫它的兩個方法：
//            a. onServiceDisconnected(ComponentName name){}
//		b. onServiceConnected(ComponentName name,Ibinder service){
//        myBinder = (MyService.MyBinder)service;
//        myBinder.method1();
//    }//在這裏實現對服務的方法的調用；
//	3. 在必要的地方，比如onClick,或者onStart裏bindService()
//	4. 在必要的地方，比如onPause裏unbindService()
//    bindService(bindIntent, connection, BIND_AUTO_CREATE); // 綁定服務和活動，之後活動就可以去調服務的方法了
    long sysTS;
    private PrintService.MyBinder myBinder ;
    private ServiceConnection myServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            myBinder = (PrintService.MyBinder) service;

            new Thread(new Runnable() {
                @Override
                public void run() {
                    while(true){
                        sysTS = myBinder.getSysTS();
                        //發送給handler
                        Log.d("SGR","sysTS="+sysTS);
                        mHandler.sendEmptyMessage(3);
                    }
                }
            }).start();

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTvShow = findViewById(R.id.tv_show);
    }

    @Override
    protected void onStart() {
        super.onStart();
        Intent intent = new Intent();
        intent.setClass(this,PrintService.class);
        bindService(intent,myServiceConnection,BIND_AUTO_CREATE);
    }

    @Override
    protected void onPause() {
        super.onPause();
        unbindService(myServiceConnection);
    }

    Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 3:
                    mTvShow.setText("sysTS="+sysTS);
                    break;
            }
        }
    };
    
}