andriod 动态显示当前时间
<?xml version="1.0" encoding="UTF-8"?> <LinearLayout xmlns:android="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(); } } }