安卓开发_计时器（Chronometer）的简单使用

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6     
 7 
 8     <Chronometer 
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:textSize="20dp"
12         android:text="已用时间:0:00"
13         android:layout_gravity="center"
14         android:id="@+id/id_jishiqi"/>
15 
16     <Button
17         android:id="@+id/btn_jishi_1"
18         android:layout_width="wrap_content"
19         android:layout_height="wrap_content"
20         android:text="开始计时" />
21 
22     <Button
23         android:id="@+id/btn_jishi_2"
24         android:layout_width="wrap_content"
25         android:layout_height="wrap_content"
26         android:text="暂停计时" />
27 
28     <Button
29         android:id="@+id/btn_jishi_3"
30         android:layout_width="wrap_content"
31         android:layout_height="wrap_content"
32         android:text="复位" />
33 
34 </LinearLayout>

 1 package base_ui;
 2 
 3 import com.example.allcode.R;
 4 
 5 import android.app.Activity;
 6 import android.os.Bundle;
 7 import android.os.SystemClock;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 import android.widget.Chronometer;
12 import android.widget.Chronometer.OnChronometerTickListener;
13 
14 public class Ui_Jishiqi extends Activity implements OnClickListener{
15     private Chronometer jishiqi;
16     private Button btn_jishi_1;
17     private Button btn_jishi_2;
18     private Button btn_jishi_3;
19     
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         // TODO Auto-generated method stub
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.base_ui_jishiqi);
25         
26         jishiqi = (Chronometer) findViewById(R.id.id_jishiqi);
27         btn_jishi_1 = (Button) findViewById(R.id.btn_jishi_1);
28         btn_jishi_2 = (Button) findViewById(R.id.btn_jishi_2);
29         btn_jishi_3 = (Button) findViewById(R.id.btn_jishi_3);
30         
31         jishiqi.setBase(SystemClock.elapsedRealtime());  //设置起始时间 ，这里是从0开始
32         jishiqi.setFormat("已用时间:%s");
33         
34         btn_jishi_1.setOnClickListener(this);
35         btn_jishi_2.setOnClickListener(this);
36         btn_jishi_3.setOnClickListener(this);
37         //这里是计时器的监听器，可以在里面添加比如计时到多少事件提示什么文本等事件
38         jishiqi.setOnChronometerTickListener(new OnChronometerTickListener() {
39             
40             @Override
41             public void onChronometerTick(Chronometer chronometer) {
42                 // TODO Auto-generated method stub
43                 
44             }
45         });
46         
47         
48     }
49 　　//三个按钮的响应事件
50     @Override
51     public void onClick(View v) {
52         // TODO Auto-generated method stub
53         switch(v.getId())
54         {
55         case R.id.btn_jishi_1:
56             jishiqi.start();   //开始计时
57             break;
58         case R.id.btn_jishi_2:
59             jishiqi.stop();    //暂停计时
60             break;
61         case R.id.btn_jishi_3:
62             jishiqi.setBase(SystemClock.elapsedRealtime());  //复位
63             break;
64         }
65     }
66 
67 }