具體做法是,服務類需要增加接口,比如ICountService,另外,服務類需要有一個內部類,這樣可以方便訪問外部類的封裝數據,這個內部類 需要繼承Binder類並實現ICountService接口。還有,就是要實現Service的onBind方法,不能只傳回一個null了。
這是新建立的接口代碼:
public interface ICountService {
public abstract int getCount();
}
修改後的CountService代碼:
package com.easymorse;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
public class CountService extends Service implements ICountService {
private boolean threadDisable;
private int count;
private ServiceBinder serviceBinder = new ServiceBinder();
public class ServiceBinder extends Binder implements ICountService{
@Override
public int getCount() {
return count;
}
}
@Override
public IBinder onBind(Intent intent) {
return serviceBinder;
}
@Override
public void onCreate() {
super .onCreate();
new Thread( new Runnable() {
@Override
public void run() {
while ( ! threadDisable) {
try {
Thread.sleep( 1000 );
} catch (InterruptedException e) {
}
count ++ ;
Log.v( " CountService " , " Count is " + count);
}
}
}).start();
}
@Override
public void onDestroy() {
super .onDestroy();
this .threadDisable = true ;
Log.v( " CountService " , " on destroy " );
}
/* (non-Javadoc)
* @see com.easymorse.ICountService#getCount()
*/
public int getCount() {
return count;
}
}
需要通過ServiceConnection的內部類實現來連接Service和Activity。
public class LocalServiceDemoActivity extends Activity {
private ServiceConnection serviceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
countService = (ICountService) service;
Log.v( " CountService " , " on serivce connected, count is "
+ countService.getCount());
}
@Override
public void onServiceDisconnected(ComponentName name) {
countService = null ;
}
};
private ICountService countService;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
this .bindService( new Intent( " com.easymorse.CountService " ),
this .serviceConnection, BIND_AUTO_CREATE);
}
@Override
protected void onDestroy() {
this .unbindService(serviceConnection);
super .onDestroy(); //注意先後
}
}