Android-做个性化的进度条

 1.案例效果图

progress[1]

2.准备素材

   image

          progress1                               progress2

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

  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" /> 

image

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

          image

     样式定义的内容如下         

image

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-windowsplatformsandroid-14data es目下搜索progress_horizontal.xml文件,搜索结果如下:

    image

打开progress_horizontal.xml文件,内容如下

  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

image

progress_vertical.xml文件代码如下

  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 

  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

  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>
}

 

原文地址:https://www.cnblogs.com/hudabing/p/4571113.html