进度条ProgressBar

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     tools:context=".AndroidProgerssBarActivity" >
 7 
 8     <TextView
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:layout_centerHorizontal="true"
12         android:layout_centerVertical="true"
13         android:text="任务完成进度" />
14 
15     <ProgressBar
16         android:id="@+id/bar"
17         style="@android:style/Widget.ProgressBar.Horizontal"
18         android:layout_width="match_parent"
19         android:layout_height="wrap_content"
20         android:max="100" />
21 
22     <ProgressBar
23         android:id="@+id/bar2"
24         style="@android:style/Widget.ProgressBar.Horizontal"
25         android:layout_width="match_parent"
26         android:layout_height="wrap_content"
27         android:max="100"
28         android:progressDrawable="@drawable/ic_launcher" >
29     </ProgressBar>
30 
31     <Button
32         android:id="@+id/btn1"
33         android:layout_width="match_parent"
34         android:layout_height="wrap_content"
35         android:text="显示进度条" />
36      <Button
37         android:id="@+id/btn2"
38         android:layout_width="match_parent"
39         android:layout_height="wrap_content"
40         android:text="不显示进度条" />
41 
42 </LinearLayout>

  1 package com.example.androidprogerssbar;
  2 
  3 import android.os.Bundle;
  4 import android.os.Handler;
  5 import android.os.Message;
  6 import android.app.Activity;
  7 import android.view.Menu;
  8 import android.view.View;
  9 import android.view.View.OnClickListener;
 10 import android.view.Window;
 11 import android.widget.Button;
 12 import android.widget.ProgressBar;
 13 
 14 public class AndroidProgerssBarActivity extends Activity {
 15 
 16     // 模拟填充长度为100的数组
 17     private int[] data = new int[100];
 18     int hasData = 0;
 19     // 记录ProgressBar完成进度
 20     int status = 0;
 21 
 22     @Override
 23     protected void onCreate(Bundle savedInstanceState) {
 24         super.onCreate(savedInstanceState);
 25 
 26         //设置窗口特征，启用显示进度的进度条
 27         requestWindowFeature(Window.FEATURE_PROGRESS);
 28         //设置窗口特征，不启用显示进度的进度条
 29         requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
 30         setContentView(R.layout.activity_android_progerss_bar);
 31         Button btn1=(Button)this.findViewById(R.id.btn1);
 32         Button btn2=(Button)this.findViewById(R.id.btn2);
 33         
 34         final ProgressBar bar = (ProgressBar) this.findViewById(R.id.bar);
 35         final ProgressBar bar2 = (ProgressBar) this.findViewById(R.id.bar2);
 36 
 37         btn1.setOnClickListener(new OnClickListener() {
 38             
 39             @Override
 40             public void onClick(View arg0) {
 41                 //显示不带进度的进度条
 42                 setProgressBarIndeterminateVisibility(true);
 43                 //显示带进度的进度条
 44                 setProgressBarVisibility(true);
 45                 //设置进度条进度
 46                 setProgress(4500);
 47             }
 48         });
 49         
 50     btn2.setOnClickListener(new OnClickListener() {
 51             
 52             @Override
 53             public void onClick(View arg0) {
 54                 //显示不带进度的进度条
 55                 setProgressBarIndeterminateVisibility(false);
 56                 //显示带进度的进度条
 57                 setProgressBarVisibility(false);
 58             }
 59         });
 60     
 61         // 创建一个负责更新进度的Handler
 62         final Handler handler = new Handler() {
 63 
 64             @Override
 65             public void handleMessage(Message msg) {
 66                 // 表明消息是由该程序发送的
 67                 if (msg.what == 0x111) {
 68                     bar.setProgress(status);
 69                     bar2.setProgress(status);
 70                 }
 71             }
 72 
 73         };
 74 
 75         // 启动线程执行任务
 76         new Thread() {
 77             public void run() {
 78                 while (status < 100) {
 79                     // 获得耗时操作的完成百分比
 80                     status = doWork();
 81                     // 发送消息到Handler
 82                     Message m = new Message();
 83                     m.what = 0x111;
 84                     // 发送消息
 85                     handler.sendMessage(m);
 86                 }
 87             }
 88         }.start();
 89     }
 90 
 91     // 模拟一个耗时操作
 92     public int doWork() {
 93         data[hasData++] = (int) (Math.random() * 100);
 94         try {
 95             Thread.sleep(100);
 96         } catch (InterruptedException e) {
 97             e.printStackTrace();
 98         }
 99         return hasData;
100     }
101 
102     @Override
103     public boolean onCreateOptionsMenu(Menu menu) {
104         // Inflate the menu; this adds items to the action bar if it is present.
105         getMenuInflater().inflate(R.menu.activity_android_progerss_bar, menu);
106         return true;
107     }
108 
109 }