android service跟activity的通讯

android service和activity的通讯

我们需要用以下方式来启动service:

</pre><pre name="code" class="java"><span style="white-space:pre">		</span>Intent intent = new Intent();		intent.setClass(MainActivity.this, MyService.class);		<strong>bindService(intent,conn,BIND_AUTO_CREATE);</strong>

	ServiceConnection conn = new ServiceConnection() {				@Override		public void onServiceDisconnected(ComponentName name) {		}				@Override		public void onServiceConnected(ComponentName name, IBinder service) {			mService = ((MyService.MyBinder)service).getService();  		}	};	

这时service会执行:onCreate和onBind

然后

我们去执行一些任务:

	ImageView item_image = (ImageView)findViewById(R.id.item_image);		item_image.setOnClickListener(new View.OnClickListener() {						@Override			public void onClick(View v) {				<strong>mService.setHandler(mHandler);			   mService.startCheckIfUpgrade();</strong>			}		});	private Handler mHandler = new Handler() {		@Override		public void handleMessage(Message msg) {			switch (msg.what) {			case GET_UPGRADE_INFORMATION_COMPLETE:				System.out.println("=======notify need upgrade");				AlertDialog dialog = getCustomDialog();				dialog.show();			default:				break;			}		}	};

Service的代码是:

public class MyService extends Service {	/** thread to execute background task*/	private Thread mThread = null;		/** flag indicates if the service has been stopped*/	private boolean mStopFlag = false;		private static final int GET_UPGRADE_INFORMATION_COMPLETE = 202;		/** Handler to get notify from thread*/	private Handler mHandler = null;		public void setHandler(Handler handler) {		this.mHandler = handler;	}			@Override	public boolean onUnbind(Intent intent) {		System.out.println("====service onUnbind");		return super.onUnbind(intent);	}	public class MyBinder extends Binder {		/**		 * 获取当前Service的实例		 * 		 * @return		 */		public MyService getService() {			return MyService.this;		}	}		public void startCheckIfUpgrade() {		if(mThread == null){			mThread = new UpgradeThread();			mThread.start();		}	}	   	@Override	public IBinder onBind(Intent arg0) {		System.out.println("====service onBind");				return new MyBinder();	}		/**	 * @see android.app.Service#onCreate()	 */	@Override	public void onCreate() {		super.onCreate();		System.out.println("====service onCreate");	}	private class UpgradeThread extends Thread{		/**		 * @see java.lang.Thread#run()		 */		@Override		public void run() {			super.run();			//在这里写去服务端查看是否需要升级的逻辑			try {				Thread.sleep(3000);			} catch (InterruptedException e) {				e.printStackTrace();			}			boolean ret = true;			if(ret && !mStopFlag){				Message msg = new Message();				msg.what = GET_UPGRADE_INFORMATION_COMPLETE;				mHandler.sendMessage(msg);			}		}			}		/* (non-Javadoc)	 * @see android.app.Service#onDestroy()	 */	@Override	public void onDestroy() {		System.out.println("====ondestroy");		mStopFlag = true;		try {			if (null != mThread && mThread.isAlive()) {				try				{					mThread.stop();				}				catch (Exception e)				{				}			}			mThread = null;		}		catch (Exception e) {			e.printStackTrace();		}		super.onDestroy();		System.gc();	}}

当activity销毁后Service会执行:

onUnbind和onDestroy

这个说明这个service的生命周期和activity是一致的