package code.example.newcodeview;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.text.format.DateFormat;import android.widget.TextView;import android.app.Activity;public class MainActivity extends Activity {	private static final int msgKey = 1;	private TextView txtTime;	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		txtTime = (TextView) findViewById(R.id.txtSystemtime);		new TimeThread().start();	}	public class TimeThread extends Thread {		@Override		public void run() {			do {				try {					Thread.sleep(1000);					Message msg = new Message();					msg.what = msgKey;					mHandler.sendMessage(msg);				} catch (InterruptedException e) {					e.printStackTrace();				}			} while (true);		}	}	private Handler mHandler = new Handler() {		@Override		public void handleMessage(Message msg) {			super.handleMessage(msg);			switch (msg.what) {			case msgKey:				long sysTime = System.currentTimeMillis();				CharSequence sysTimeStr = DateFormat						.format("hh:mm:ss", sysTime);				txtTime.setText("北京时间：" + sysTimeStr);				break;			default:				break;			}		}	};}