Android中当前时间的动态显示

//主要使用子线程发送消息 使用Handler更新显示import java.text.SimpleDateFormat;import java.util.Date;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.widget.TextView;public class MainActivity extends Activity  implements Runnable{private Handler handler;private TextView textView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        textView=(TextView) findViewById(R.id.time);            handler = new Handler() {                public void handleMessage(Message msg) {                    textView.setText((String)msg.obj);                }            };                    new Thread(this).start();    }    @Override    public void run() {        // TODO Auto-generated method stub        try {            while(true){                SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日   HH:mm:ss");                String str=sdf.format(new Date());                handler.sendMessage(handler.obtainMessage(100,str));                Thread.sleep(1000);            }        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}
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