6
,handleMessage(消息msg)将在新线程上运行,但是当我使用Handler.sendMessage( msg),handleMessage(Message msg)将在主线程上运行,谁可以告诉我它们之间的区别。当我使用Handler.dispatchMessage(msg)时,Handler.dispatchMessage(msg)和Handler.sendMessage(msg)之间的区别
谢谢!
演示:
public class MainActivity extends Activity
{
private String TAG = "MainActivity";
private Handler mHandler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
Log.i(TAG, "Handler:" + Thread.currentThread().getId() + "&arg1=" + msg.arg1);
super.handleMessage(msg);
}
};
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.i(TAG, "Main:" + Thread.currentThread().getId());
testMethod();
}
private void testMethod()
{
Thread thread = new Thread()
{
@Override
public void run()
{
Log.i(TAG, "Thread:" + Thread.currentThread().getId());
Message msg = mHandler.obtainMessage();
msg.arg1 = 1;
mHandler.dispatchMessage(msg);
Message msg2 = mHandler.obtainMessage();
msg2.arg1 = 2;
mHandler.sendMessage(msg2);
}
};
thread.start();
}
}
输出:
04-19 11:32:10.452: INFO/MainActivity(774): Main:1 04-19 11:32:10.488: INFO/MainActivity(774): Thread:8 04-19 11:32:10.492: INFO/MainActivity(774): Handler:8&arg1=1 04-19 11:32:10.635: INFO/MainActivity(774): Handler:1&arg1=2
哪里对象**“消息”**来自上面的代码? – waqaslam 2012-04-19 13:46:01
@Waqas from your code'mHandler.dispatchMessage(msg)' - 它是'Handler.dispatchMessage'的源代码(稍微简化) – zapl 2012-04-19 13:52:11
是的,但是* dispatchMessage(消息味精)*说** msg **,但是在代码中它也是使用**消息**这是谁我关于 – waqaslam 2012-04-19 13:58:04