Android 动态显示时间

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;

			}

		}

	};

}

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