Android Service简单实例

package com.test; import android.app.Service; import android.os.IBinder; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.os.Process; import android.os.HandlerThread; import android.content.Intent; import android.util.Log; public class BaseServiceImpl extends Service { private static final String TAG = "skywang-->IntentServiceTest"; private Looper mServiceLooper; private ServiceHandler mServiceHandler; private class ServiceHandler extends Handler { public ServiceHandler(Looper looper) { super(looper); } // 服务的消息处理函数：将数值翻倍；然后，终止服务。 @Override public void handleMessage(Message msg) { Log.d(TAG, "hand msg="+msg); doubleNumber(msg.arg2); stopSelf(); } } // 将数字的值x2 private synchronized void doubleNumber(int val) { int num = val * 2; Log.d(TAG, "num="+num); } @Override public void onCreate() { Log.d(TAG, "on create"); // 新建一个线程来运行服务，线程的优先级是10 HandlerThread thread = new HandlerThread("BaseServiceImpl", Process.THREAD_PRIORITY_BACKGROUND); // 在使用HandlerThread的getLooper()方法之前，必须先调用该类的start()开启线程 thread.start(); // 获取线程对应的looper mServiceLooper = thread.getLooper(); // 新建handler来处理looper中的消息 mServiceHandler = new ServiceHandler(mServiceLooper); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.d(TAG, "start command: intent="+intent); // 获取一个消息对象msg Message msg = mServiceHandler.obtainMessage(); // 设置msg的arg1和arg2(都为int类型) msg.arg1 = startId; msg.arg2 = intent.getIntExtra("number", 0); // 将消息发送到消息队列，系统会自动调用handleMessage进行消息处理。 mServiceHandler.sendMessage(msg); return START_STICKY; } @Override public IBinder onBind(Intent intent) { Log.d(TAG, "on bind"); return null; } @Override public void onDestroy() { Log.d(TAG, "on destroy"); } }