Service启动，绑定与交互

1. Service的启动方式有startServcie和bindService两种。

startService时，会经历onCreate—onStartCommand—onDestroy生命周期，

bindService时，会经历onCreate—onBind—onUnbind—onDestroy生命周期。

2. Service与Activity之间交互时，可以通过bindService获取Service的连接的Binder，进而可以获取Service的引用，这样就可以与Service进行交互了。示例中，通过Service每秒更新TextView一次。

ICounterCallback接口

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package com.fxb.servicetest;   public interface ICounterCallback {     public void count(int val); }

CountService类

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package com.fxb.servicetest;   import android.app.Service; import android.content.Intent; import android.os.AsyncTask; import android.os.Binder; import android.os.IBinder; import android.support.annotation.Nullable; import android.util.Log;   public class CountService extends Service{       private volatile boolean isRunning = true;     private CounterBinder counterBinder = new CounterBinder();       @Nullable     @Override     public IBinder onBind(Intent intent) {         Log.i(MainActivity.TAG, "on bind!");         return counterBinder;     }       public void startCounter(final int value, final ICounterCallback callback){         isRunning = true;         new AsyncTask<Integer, Integer, Void>() {             @Override             protected Void doInBackground(Integer... params) {                 int count = params[0];                 while(isRunning){                     try {                         Thread.sleep(1000);                         count++;                         Log.i(MainActivity.TAG, Integer.toString(count));                         publishProgress(count);                     } catch (InterruptedException e) {                         e.printStackTrace();                     }                 }                 return null;             }               @Override             protected void onProgressUpdate(Integer... values) {                 super.onProgressUpdate(values);                 callback.count(values[0]);             }         }.execute(0);     }       public void stopCounter(){         isRunning = false;     }       @Override     public void onCreate() {         super.onCreate();         Log.i(MainActivity.TAG, "on create!");     }       @Override     public int onStartCommand(Intent intent, int flags, int startId) {         Log.i(MainActivity.TAG, "on start command!");         return super.onStartCommand(intent, flags, startId);     }       @Override     public boolean onUnbind(Intent intent) {         Log.i(MainActivity.TAG, "on unbind servcie!");         return super.onUnbind(intent);     }       @Override     public void onDestroy() {         isRunning = false;         Log.i(MainActivity.TAG, "on destroy service");         super.onDestroy();     }       @Override     public boolean stopService(Intent name) {         Log.i(MainActivity.TAG, "on stop service!");         return super.stopService(name);     }       public class CounterBinder extends Binder{         public CountService getService(){             return CountService.this;         }     } }

MainActivity类

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package com.fxb.servicetest;   import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView;   public class MainActivity extends Activity implements View.OnClickListener, ICounterCallback{       public static final String TAG = "ServiceTest";       private TextView tvShow;     private Button btnStartServie, btnStopService;     private Button btnBindService, btnUnbindService;     private Button btnStartCounter, btnStopCounter;     private CountService countService;       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         initView();     }       private void initView(){         tvShow = (TextView)findViewById(R.id.tvShow);         btnStartServie = (Button)findViewById(R.id.btnStartService);         btnStopService = (Button)findViewById(R.id.btnStopService);         btnBindService = (Button)findViewById(R.id.btnBindService);         btnUnbindService = (Button)findViewById(R.id.btnUnbindService);         btnStartCounter = (Button)findViewById(R.id.btnStartCount);         btnStopCounter = (Button)findViewById(R.id.btnStopCount);           btnStartServie.setOnClickListener(this);         btnStopService.setOnClickListener(this);         btnBindService.setOnClickListener(this);         btnUnbindService.setOnClickListener(this);         btnStartCounter.setOnClickListener(this);         btnStopCounter.setOnClickListener(this);     }       private void startCountService(){         Intent intent = new Intent(MainActivity.this, CountService.class);         startService(intent);     }       private void stopCountService(){         Intent intent = new Intent(MainActivity.this, CountService.class);         stopService(intent);     }       private void myBindService(){         Intent intent = new Intent(MainActivity.this, CountService.class);         bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);     }       private void myUnbindService(){         unbindService(serviceConnection);     }       @Override     public void onClick(View v) {         if(v == btnStartServie){             Log.i(TAG, "start click");             startCountService();         }         else if(v == btnStopService){             stopCountService();         }         else if(v == btnBindService){             myBindService();         }         else if(v == btnUnbindService){             myUnbindService();         }         else if(v == btnStartCounter){             if(countService != null){                 countService.startCounter(0, this);             }         }         else if(v == btnStopCounter){             if(v == btnStopCounter){                 countService.stopCounter();             }         }     }       @Override     public void count(int val) {         tvShow.setText("count:"+val);     }       private ServiceConnection serviceConnection = new ServiceConnection() {         @Override         public void onServiceConnected(ComponentName name, IBinder service) {             Log.i(MainActivity.TAG, "service connected!");             CountService.CounterBinder binder = (CountService.CounterBinder)service;             countService = binder.getService();         }           @Override         public void onServiceDisconnected(ComponentName name) {             Log.i(MainActivity.TAG, "service disconnected!");         }     };   }

在bindService之后，点击startCount后，tvShow每隔1s更新一次，点击stopCount后停止更新。