ProgressBar的使用

简单的使用下ProgressBar...

1.设置进度条的可见性通过setVisibility(int v)方法.注意v的取值.如下描述:

View 的setVisibility有三个值可以设置：
VISIBLE--->可见
INVISIBLE--->不可见，但这个View在ViewGroupt中仍保留它的位置，不重新layout
GONE---->不可见，但这个View在ViewGroupt中不保留位置，重新layout,那后面的view就会取代他的位置。

2.设置进度条长度通过setProgress()方法.

创建项目步骤:

step1:新建android工程，命名为ProgressBarTest。

step2:设置布局文件main.xml

main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent"
 5     android:orientation="vertical" >
 6 
 7     <TextView
 8         android:layout_width="fill_parent"
 9         android:layout_height="wrap_content"
10         android:text="@string/hello" />
11 <!--
12     设置水平的进度条 style="?android:attr/progressBarStyleHorizontal" 
13     设置转圈的进度条style="?android:attr/progressBarStyle"
14 -->    
15     <ProgressBar 
16         android:id="@+id/firstprogress"
17         style="?android:attr/progressBarStyleHorizontal"
18         android:layout_width="200dp"
19         android:layout_height="wrap_content"
20         android:visibility="gone"/>
21     
22     <ProgressBar 
23         android:id="@+id/secondprogress"
24         style="?android:attr/progressBarStyle"
25         android:layout_width="200dp"
26         android:layout_height="wrap_content"
27         android:visibility="gone"/>
28     
29     <Button 
30         android:id="@+id/button"
31         android:layout_width="wrap_content"
32         android:layout_height="wrap_content"
33         android:text="确定"/>
34 
35 </LinearLayout>

step3:设计主类ProgressBarTest.java

ProgressBarTest

 1 package com.cb.progressbar;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.view.View.OnClickListener;
 7 import android.widget.Button;
 8 import android.widget.ProgressBar;
 9 
10 public class ProgressBarTest extends Activity {
11     private ProgressBar mProgressBar1;
12     private ProgressBar mProgressBar2;
13     private Button mButton;
14     
15     private int i = 0;
16     
17     @Override
18     public void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.main);
21         
22         mProgressBar1 = (ProgressBar)findViewById(R.id.firstprogress);
23         mProgressBar2 = (ProgressBar)findViewById(R.id.secondprogress);
24         mButton = (Button)findViewById(R.id.button);
25         
26         mButton.setOnClickListener(new OnClickListener() {
27             
28             @Override
29             public void onClick(View v) {
30                 if (i==0) {
31                     //设置进度条可见
32                     mProgressBar1.setVisibility(View.VISIBLE);
33                     mProgressBar2.setVisibility(View.VISIBLE);
34                 }
35                 else if (i < mProgressBar1.getMax()) {
36                     //设置点击进度条时，进度条进度增加
37                     mProgressBar1.setProgress(i);
38                     //设置第二进度条(浅色的那条)
39                     mProgressBar1.setSecondaryProgress(i+10);
40                     mProgressBar2.setProgress(i);
41                 }
42                 else {
43                     //当进度条走完时，设置进度条不可见
44                     mProgressBar1.setVisibility(View.GONE);
45                     mProgressBar2.setVisibility(View.GONE);
46                 }
47                 i = i+10;
48             }
49         });
50         
51     }
52 }

step4:执行结果如下