簡單的 Android 計時器(Chronometer)

android.widget.Chronometer 是一個實現簡單計時器的類.

範例:

package com.SimpleTimer;

import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;

public class SimpleTimer extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       Button Start = (Button)findViewById(R.id.start);
       Button Stop = (Button)findViewById(R.id.stop);
       Button Reset = (Button)findViewById(R.id.reset);
       final Chronometer timer = (Chronometer)findViewById(R.id.timer);
      
       Start.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    timer.start();
   }});
      
       Stop.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    timer.stop();
   }});
      
       Reset.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    timer.setBase(SystemClock.elapsedRealtime());
   }});
      
   }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<Button
   android:id="@+id/start"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Start"
   />
<Button
   android:id="@+id/stop"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Stop"
   />
<Button
   android:id="@+id/reset"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Reset"
   />
<Chronometer
   android:id="@+id/timer"
   android:layout_gravity="center_horizontal"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   />
</LinearLayout>