hander_sy1.rar_android

package android.handler; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class hander_sy1 extends Activity implements OnClickListener{ private Button button = null; private TextView text = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button = (Button)findViewById(R.id.btn); button.setOnClickListener(this); text = (TextView)findViewById(R.id.text); } public void onClick(View v) { switch (v.getId()) { case R.id.btn: Looper looper = Looper.myLooper();//取得当前主线程里的looper MyHandler mHandler = new MyHandler(looper);//构造一个handler使之可与looper通信 //buton等组件可以由mHandler将消息传给looper后,再放入messageQueue中,同时mHandler也可以接受来自looper消息 mHandler.removeMessages(0); String msgStr = "主线程不同组件通信:消息来自button"; Message m = mHandler.obtainMessage(1, 2, 3, msgStr);//构造要传递的消息 mHandler.sendMessage(m);//发送消息:系统会自动调用handleMessage方法来处理消息 break; } } private class MyHandler extends Handler{ public MyHandler(Looper looper){ super(looper); } @Override public void handleMessage(Message msg) {//处理消息 text.setText(msg.obj.toString()+" "+msg.what+msg.arg1+msg.arg2); } } }