Android-做个性化的进度条

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2.准备素材

  

                                        

progress1.png(78*78)              progress2.png(78*78)

3.原理

采用一张图片作为ProgressBar的背景图片(一般采用颜色比较浅的)。另一张是进度条的图片(一般采用颜色比较深的图片)。进度在滚动时：进度图片逐步显示，背景图片逐步隐藏，达到上面的效果。

4.灵感来自Android控件提供的源码

4.1 默认带进度的进度条，如下图

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1. <ProgressBar  
2.    android:id="@+id/progressBar2"  
3.    style="@android:style/Widget.ProgressBar.Horizontal"  
4.    android:layout_width="268dp"  
5.     android:layout_height="wrap_content"  
6.    android:progress="45" />   

 <ProgressBar
    android:id="@+id/progressBar2"
    style="@android:style/Widget.ProgressBar.Horizontal"
    android:layout_width="268dp"
     android:layout_height="wrap_content"
    android:progress="45" /> 

注意：关键是style属性在起作用

4.2 找到样式定义的位置

     鼠标放在style属性值上，按下Ctrl键，出现超链接，点击超链接跳转到样式的定义位置

         

     样式定义的内容如下         

重点研究：

android:progressDrawable：进度条的样式

@android:drawable/progress_horizontal：样式定义的文件

在android-sdk-windows\platforms\android-14\data\res目下搜索progress_horizontal.xml文件，搜索结果如下：

   

打开progress_horizontal.xml文件，内容如下

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1. <layer-listxmlns:androidlayer-listxmlns:android="http://schemas.android.com/apk/res/android">     
2.      <itemandroid:iditemandroid:id="@android:id/background">  
3.         <shape>  
4.              <cornersandroid:radiuscornersandroid:radius="5dip"/>  
5.              <gradient  
6.                      android:startColor="#ff9d9e9d"  
7.                      android:centerColor="#ff5a5d5a"  
8.                      android:centerY="0.75"  
9.                     android:endColor="#ff747674"  
10.                      android:angle="270"  
11.             />  
12.          </shape>  
13.     </item>     
14.      <itemandroid:iditemandroid:id="@android:id/secondaryProgress">  
15.          <clip>  
16.              <shape>  
17.                  <cornersandroid:radiuscornersandroid:radius="5dip"/>  
18.                  <gradient  
19.                          android:startColor="#80ffd300"  
20.                         android:centerColor="#80ffb600"  
21.                          android:centerY="0.75"  
22.                         android:endColor="#a0ffcb00"  
23.                          android:angle="270"  
24.                  />  
25.             </shape>  
26.         </clip>  
27.     </item>     
28.     <itemandroid:iditemandroid:id="@android:id/progress">  
29.          <clip>  
30.              <shape>  
31.                  <cornersandroid:radiuscornersandroid:radius="5dip"/>  
32.                  <gradient  
33.                          android:startColor="#ffffd300"  
34.                          android:centerColor="#ffffb600"  
35.                          android:centerY="0.75"  
36.                         android:endColor="#ffffcb00"  
37.                          android:angle="270"  
38.                  />  
39.              </shape>  
40.          </clip>  
41.      </item>  
42.  </layer-list>  

<layer-listxmlns:android="http://schemas.android.com/apk/res/android">   
     <itemandroid:id="@android:id/background">
        <shape>
             <cornersandroid:radius="5dip"/>
             <gradient
                     android:startColor="#ff9d9e9d"
                     android:centerColor="#ff5a5d5a"
                     android:centerY="0.75"
                    android:endColor="#ff747674"
                     android:angle="270"
            />
         </shape>
    </item>   
     <itemandroid:id="@android:id/secondaryProgress">
         <clip>
             <shape>
                 <cornersandroid:radius="5dip"/>
                 <gradient
                         android:startColor="#80ffd300"
                        android:centerColor="#80ffb600"
                         android:centerY="0.75"
                        android:endColor="#a0ffcb00"
                         android:angle="270"
                 />
            </shape>
        </clip>
    </item>   
    <itemandroid:id="@android:id/progress">
         <clip>
             <shape>
                 <cornersandroid:radius="5dip"/>
                 <gradient
                         android:startColor="#ffffd300"
                         android:centerColor="#ffffb600"
                         android:centerY="0.75"
                        android:endColor="#ffffcb00"
                         android:angle="270"
                 />
             </shape>
         </clip>
     </item>
 </layer-list>

释义：

     <item android:id="@android:id/background">：定义进度条的背景样式

     <item android:id="@android:id/secondaryProgress">：辅助进度条的样式

    <item android:id="@android:id/progress">：进度条的样式

思考：如果我想做垂直进度条，怎么办了？

关键在clip元素的属性上做修改

<clip
    android:clipOrientation="vertical"    定义滚动的方向 vertical为垂直方向
    android:drawable="@drawable/progress1"  定义进度的图片
    android:gravity="bottom" >  定义进度的开始位置
</clip>

 

5.定义样式文件progress_vertical.xml

progress_vertical.xml文件代码如下

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1. <?xmlversionxmlversion="1.0"encoding="utf-8"?>  
2. <layer-listxmlns:androidlayer-listxmlns:android="http://schemas.android.com/apk/res/android">  
3.      <itemandroid:iditemandroid:id="@android:id/progress">  
4.         <clip  
5.             android:clipOrientation="vertical"  
6.         android:drawable="@drawable/progress1"  
7.          android:gravity="bottom">  
8.       </clip>  
9.  </item>  
10. </layer-list>  

<?xmlversion="1.0"encoding="utf-8"?>
<layer-listxmlns:android="http://schemas.android.com/apk/res/android">
     <itemandroid:id="@android:id/progress">
        <clip
            android:clipOrientation="vertical"
        android:drawable="@drawable/progress1"
         android:gravity="bottom">
      </clip>
 </item>
</layer-list>

 

 

6.应用自定义的样式 

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1. <Button  
2.         android:id="@+id/btStart"  
3.         android:layout_width="fill_parent"  
4.         android:layout_height="wrap_content"  
5.         android:layout_marginTop="150dp"  
6.         android:text="开始"/>  
7.    
8.     <ProgressBar  
9.         android:id="@+id/pbPic"  
10.         style="@android:style/Widget.ProgressBar.Horizontal"  
11.         android:layout_width="50dp"  
12.         android:layout_height="68dp"  
13.         android:background="@drawable/progress2"  
14.         android:max="100"  
15.         android:progress="0"  
16.         android:progressDrawable="@drawable/progress_vertical" />    <!-- 在此属性上应用 -->  
17.    
18.     <TextView  
19.         android:id="@+id/txtProgress"  
20.         android:layout_width="wrap_content"  
21.         android:layout_height="wrap_content"/>  

<Button
        android:id="@+id/btStart"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="150dp"
        android:text="开始"/>
 
    <ProgressBar
        android:id="@+id/pbPic"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="50dp"
        android:layout_height="68dp"
        android:background="@drawable/progress2"
        android:max="100"
        android:progress="0"
        android:progressDrawable="@drawable/progress_vertical" />    <!-- 在此属性上应用 -->
 
    <TextView
        android:id="@+id/txtProgress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

7.点击按钮模拟进度滚动的效果

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1. <span style="color:#333333;">public class  ProgressActivity extends Activity {       
2.       ProgressBar pb = null;  
3.       TextView txtProgress;  
4.       Handler handler = new Handler();  
5.       @Override  
6.       publicvoid onCreate(Bundle savedInstanceState) {  
7.            super.onCreate(savedInstanceState);  
8.            setContentView(R.layout.main);  
9.            System.out.println("主题=" + getTheme() + "");  
10.            pb = (ProgressBar) findViewById(R.id.pbPic);  
11.            Button btnStart = (Button) findViewById(R.id.btStart);//按钮  
12.            txtProgress = (TextView) findViewById(R.id.txtProgress);//显示进度  
13.            btnStart.setOnClickListener(new OnClickListener() {//按钮点击事件  
14.                  publicvoid onClick(View v) {  
15.                       new Thread(new Runnable() {//创建并启动线程，使用线程执行模拟的任务  
16.                                        publicvoid run() {  
17.                                              for (inti = 0; i < 100; i++) { //循环100遍  
18.                                                   try {  
19.                                                         handler.post(new Runnable() { //更新界面的数据  
20.                                                               publicvoid run() {  
21.                                                                    pb.incrementProgressBy(1);//增加进度  
22.                                                                    txtProgress.setText(pb.getProgress() + "%");//显示完成的进度  
23.                                                               }  
24.                                                         });  
25.                                                         Thread.sleep(100);  
26.                                                   } catch (InterruptedException e) {  
27.    
28.                                                   }  
29.                                              }  
30.                                        }  
31.                                   }).start();  
32.                  }  
33.            });  
34.       }</span>  
35. }  

<span style="color:#333333;">public class  ProgressActivity extends Activity {     
      ProgressBar pb = null;
      TextView txtProgress;
      Handler handler = new Handler();
      @Override
      publicvoid onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.main);
           System.out.println("主题=" + getTheme() + "");
           pb = (ProgressBar) findViewById(R.id.pbPic);
           Button btnStart = (Button) findViewById(R.id.btStart);//按钮
           txtProgress = (TextView) findViewById(R.id.txtProgress);//显示进度
           btnStart.setOnClickListener(new OnClickListener() {//按钮点击事件
                 publicvoid onClick(View v) {
                      new Thread(new Runnable() {//创建并启动线程，使用线程执行模拟的任务
                                       publicvoid run() {
                                             for (inti = 0; i < 100; i++) { //循环100遍
                                                  try {
                                                        handler.post(new Runnable() { //更新界面的数据
                                                              publicvoid run() {
                                                                   pb.incrementProgressBy(1);//增加进度
                                                                   txtProgress.setText(pb.getProgress() + "%");//显示完成的进度
                                                              }
                                                        });
                                                        Thread.sleep(100);
                                                  } catch (InterruptedException e) {
 
                                                  }
                                             }
                                       }
                                  }).start();
                 }
           });
      }</span>
}