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Android自定义进度条

2014-11-17 17:03 260 查看
Android原生控件只有横向进度条一种,而且没法变换样式,比如原生rom的样子



很丑是吧,当伟大的产品设计要求更换前背景,甚至纵向,甚至圆弧状的,咋办,比如



ok,我们开始吧:
 
一)变换前背景
 

先来看看progressbar的属性:

1. <ProgressBar

2.             android:id="@+id/progressBar"

3.             style="?android:attr/progressBarStyleHorizontal"

4.             android:layout_width="match_parent"

5.             android:layout_height="wrap_content"

6.             android:layout_margin="5dip"

7.             android:layout_toRightOf="@+id/progressBarV"

8.             android:indeterminate="false"

9.             android:padding="2dip"

10.             android:progress="50" />

根据style="?android:attr/progressBarStyleHorizontal",我们找到源码中的style.xml

1. <style name="Widget.ProgressBar.Horizontal">

2.         <item name="android:indeterminateOnly">false</item>

3.         <item name="android:progressDrawable">@android:drawable/progress_horizontal</item>

4.         <item name="android:indeterminateDrawable">@android:drawable/progress_indeterminate_horizontal</item>

5.         <item name="android:minHeight">20dip</item>

6.         <item name="android:maxHeight">20dip</item>

7.     </style>

看到

<item name="android:progressDrawable">@android:drawable/progress_horizontal</item>

木有,继续发掘源码,找到drawable下面的progress_horizontal.xml,这就是我们今天的主角了:

1. <layer-list xmlns:android="http://schemas.android.com/apk/res/android">

2.     

3.     <item android:id="@android:id/background">

4.         <shape>

5.             <corners android:radius="5dip" />

6.             <gradient

7.                     android:startColor="#ff9d9e9d"

8.                     android:centerColor="#ff5a5d5a"

9.                     android:centerY="0.75"

10.                     android:endColor="#ff747674"

11.                     android:angle="270"

12.             />

13.         </shape>

14.     </item>

15.     

16.     <item android:id="@android:id/secondaryProgress">

17.         <clip>

18.             <shape>

19.                 <corners android:radius="5dip" />

20.                 <gradient

21.                         android:startColor="#80ffd300"

22.                         android:centerColor="#80ffb600"

23.                         android:centerY="0.75"

24.                         android:endColor="#a0ffcb00"

25.                         android:angle="270"

26.                 />

27.             </shape>

28.         </clip>

29.     </item>

30.     

31.     <item android:id="@android:id/progress">

32.         <clip>

33.             <shape>

34.                 <corners android:radius="5dip" />

35.                 <gradient

36.                         android:startColor="#ffffd300"

37.                         android:centerColor="#ffffb600"

38.                         android:centerY="0.75"

39.                         android:endColor="#ffffcb00"

40.                         android:angle="270"

41.                 />

42.             </shape>

43.         </clip>

44.     </item>

45.     

46. </layer-list>

 看到android:id="@android:id/progress"木有,看到android:id="@android:id/secondaryProgress"木有

把这个文件复制到自己工程下的drawable,就可以随心所欲的修改shape的属性,渐变,圆角等等

那么怎么放一个图片进去呢,ok,新建progress_horizontal1.xml:

1. <?xml version="1.0" encoding="utf-8"?>

2. <layer-list xmlns:android="http://schemas.android.com/apk/res/android">

3.     

4.     <item android:id="@android:id/progress" android:drawable="@drawable/progressbar" />

5.     

6. </layer-list>

在android:drawable中指定你处理好的图片

然后回到布局中

1. <ProgressBar

2.             android:id="@+id/progressBar1"

3.             android:layout_width="match_parent"

4.             android:layout_height="wrap_content"

5.             android:layout_below="@+id/progressBar"

6.             android:layout_margin="5dip"

7.             android:layout_toRightOf="@+id/progressBarV"

8.             android:background="@drawable/progress_bg"

9.             android:indeterminate="false"

10.             android:indeterminateOnly="false"

11.             android:maxHeight="20dip"

12.             android:minHeight="20dip"

13.             android:padding="2dip"

14.             android:progress="50"

15.             android:progressDrawable="@drawable/progress_horizontal1" />

android:background="@drawable/progress_bg"指定背景

  android:progressDrawable="@drawable/progress_horizontal1"前景使用上面的progress_horizontal1

ok,搞定



 注意看,四角还是有圆倒角的,貌似是系统自己加上去的,总之我的图片里面是没有做这个倒角处理的

 

二)纵向进度条

 

 

还是得从源码入手,看回progress_horizontal.xml

1. <item android:id="@android:id/progress">

2.         <clip>

3.             <shape>

4.                 <corners android:radius="5dip" />

5.                 <gradient

6.                         android:startColor="#ffffd300"

7.                         android:centerColor="#ffffb600"

8.                         android:centerY="0.75"

9.                         android:endColor="#ffffcb00"

10.                         android:angle="270"

11.                 />

12.             </shape>

13.         </clip>

14.     </item>

为什么shape外面要包一层clip呢,官方文档解释是clipdrawable是可以自我复制的,来看看定义

1. <?xml version="1.0" encoding="utf-8"?>

2. <clip

3.     xmlns:android="http://schemas.android.com/apk/res/android"

4.     android:drawable="@drawable/drawable_resource"

5.     android:clipOrientation=["horizontal" | "vertical"]

6.     android:gravity=["top" | "bottom" | "left" | "right" | "center_vertical" |

7.                      "fill_vertical" | "center_horizontal" | "fill_horizontal" |

8.                      "center" | "fill" | "clip_vertical" | "clip_horizontal"] />

android:clipOrientation有两个属性,默认为horizontal

android:gravity有两个属性,默认为left

那我们试试改成vertical和bottom会有什么效果,新建一个progress_vertical.xml,把源码progress_horizontal.xml的内容复制过来,这里去掉了secondaryProgress,修改了clip,shape的渐变中心centerY改为centerX

1. <item android:id="@android:id/progress">

2.         <clip

3.             android:clipOrientation="vertical"

4.             android:gravity = "bottom">

5.             <shape>

6.                 <corners android:radius="5dip" />

7.                 <gradient

8.                         android:startColor="#ffffd300"

9.                         android:centerColor="#ffffb600"

10.                         android:centerX="0.75"

11.                         android:endColor="#ffffcb00"

12.                         android:angle="90"

13.                 />

14.             </shape>

15.         </clip>

16.     </item>

布局中android:progressDrawable="@drawable/progress_vertical"

  ok,搞定,就是这么简单:



 

 

三)弧形bar

 

 

这个也许算不上是进度条,用的也不多,最多也就仪表盘用用,不然谁会把进度条整成圆弧的呢。好吧这个可不是改改源码就能搞定的,看代码

1. public class Arcs extends View {  

2.     private Paint mArcPaint;  

3.     private Paint mArcBGPaint;  

4.   

5.     private RectF mOval;  

6.     private float mSweep = 0;  

7.     private int mSpeedMax = 200;

8.     private int mThreshold = 100;

9.     private int mIncSpeedValue = 0;

10.     private int mCurrentSpeedValue = 0; 

11.     private float mCenterX;  

12.     private float mCenterY;  

13.     private float mSpeedArcWidth;  

14.  

15.     private final float SPEED_VALUE_INC = 2; 

16.  

17.     .......... 

18.  

19. } 

首先是一堆成员变量,两个Paint用来画圆弧一个前景一个背景,一个RectF圆弧就画在上面,然后是一些控制参数比如sweep圆弧扫过的角度,xy坐标等等

 

1. mArcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

2.         mArcPaint.setStyle(Paint.Style.STROKE);

3.         mArcPaint.setStrokeWidth(mSpeedArcWidth);

4. //        mPaint.setStrokeCap(Paint.Cap.ROUND);

5.         mArcPaint.setColor(0xff81ccd6);

6.         BlurMaskFilter mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.INNER);

7.         mArcPaint.setMaskFilter(mBlur);

8.         

9.         mArcBGPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

10.         mArcBGPaint.setStyle(Paint.Style.STROKE);

11.         mArcBGPaint.setStrokeWidth(mSpeedArcWidth+8);

12.         mArcBGPaint.setColor(0xff171717);

13.         

14.         BlurMaskFilter mBGBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.INNER);

15.       mArcBGPaint.setMaskFilter(mBGBlur);

设置两个画笔,颜色,宽度,样式等等,BlurMaskFilter笔是边缘模糊效果,有几种,可以自己尝试

 

1. @Override

2. protected void onSizeChanged(int w, int h, int ow, int oh) {

3.         super.onSizeChanged(w, h, ow, oh);

4.         Log.i("onSizeChanged w", w+"");

5.         Log.i("onSizeChanged h", h+"");

6.         mCenterX = w * 0.5f;  // remember the center of the screen

7.         mCenterY = h - mSpeedArcWidth;

8.         mOval = new RectF(mCenterX - mCenterY, mSpeedArcWidth, mCenterX + mCenterY, mCenterY * 2);

9.     }

重写父类View的onSizeChanged,为的是自己根据布局中的大小做居中处理

 

1. @Override  

2.     protected void onDraw(Canvas canvas) { 

3.         drawSpeed(canvas); 

4.         calcSpeed(); 

5.     } 

6.  

7. private void drawSpeed(Canvas canvas) { 

8.         canvas.drawArc(mOval, 179, 181, false, mArcBGPaint); 

9.  

10.         mSweep = (float) mIncSpeedValue / mSpeedMax * 180; 

11.         if (mIncSpeedValue > mThreshold) { 

12.             mArcPaint.setColor(0xFFFF0000); 

13.         } 

14.         else { 

15.             mArcPaint.set
aacb
Color(0xFF00B0F0); 

16.         } 

17.          

18.         canvas.drawArc(mOval, 180, mSweep, false, mArcPaint);         

19.     } 

20.  

21. private void calcSpeed() { 

22.         if (mIncSpeedValue < mCurrentSpeedValue) { 

23.             mIncSpeedValue += SPEED_VALUE_INC; 

24.             if (mIncSpeedValue > mCurrentSpeedValue) { 

25.                 mIncSpeedValue = mCurrentSpeedValue; 

26.             } 

27.             invalidate(); 

28.         } 

29.         else if (mIncSpeedValue > mCurrentSpeedValue) { 

30.             mIncSpeedValue -= SPEED_VALUE_INC; 

31.             if (mIncSpeedValue < mCurrentSpeedValue) { 

32.                 mIncSpeedValue = mCurrentSpeedValue; 

33.             } 

34.             invalidate(); 

35.         } 

36.     } 

重写onDraw以便重绘canvas

drawSpeed里面

通过计算mSweep = (float) mIncSpeedValue / mSpeedMax * 180;

然后canvas.drawArc(mOval, 180, mSweep, false, mArcPaint);

会根据mSweep的变化,画出相应长度的弧度来

根据与阈值的对比,还可以设定不同的 颜色:

 

if (mIncSpeedValue > mThreshold) {

   mArcPaint.setColor(0xFFFF0000);

  }

  else {

   mArcPaint.setColor(0xFF00B0F0);

  }

 

 

calcSpeed通过一个步进来控制增量或减量,以使弧度自然过渡,减少跳跃

ok,大功告成

 

 
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