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[操作系统]andriod 动态显示当前时间


<??><LinearLayout  ="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical">  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="New Text"    android:id="@+id/time"    android:layout_gravity="center_horizontal" /></LinearLayout>

package com.example.yanlei.mytk;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.widget.TextView;import java.text.SimpleDateFormat;import java.util.Date;public class MainActivity extends AppCompatActivity implements Runnable {  private Handler handler;  private TextView textView;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_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();    }  }}