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Android那些事儿之自定义进度条

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 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:

<ProgressBar 
            android:id="@+id/progressBar" 
            style="?android:attr/progressBarStyleHorizontal" 
            android:layout_width="match_parent" 
            android:layout_height="wrap_content" 
            android:layout_margin="5dip" 
            android:layout_toRightOf="@+id/progressBarV" 
            android:indeterminate="false" 
            android:padding="2dip" 
            android:progress="50" /> 

 

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

<style name="Widget.ProgressBar.Horizontal"> 
        <item name="android:indeterminateOnly">false</item> 
        <item name="android:progressDrawable">@android:drawable/progress_horizontal</item> 
        <item name="android:indeterminateDrawable">@android:drawable/progress_indeterminate_horizontal</item> 
        <item name="android:minHeight">20dip</item> 
        <item name="android:maxHeight">20dip</item> 
    </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:

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

<?xml version="1.0" encoding="utf-8"?> 
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"> 
     
    <item android:id="@android:id/progress" android:drawable="@drawable/progressbar" /> 
     
</layer-list> 

 

在android:drawable中指定你处理好的图片

然后回到布局中

<ProgressBar 
            android:id="@+id/progressBar1" 
            android:layout_width="match_parent" 
            android:layout_height="wrap_content" 
            android:layout_below="@+id/progressBar" 
            android:layout_margin="5dip" 
            android:layout_toRightOf="@+id/progressBarV" 
            android:background="@drawable/progress_bg" 
            android:indeterminate="false" 
            android:indeterminateOnly="false" 
            android:maxHeight="20dip" 
            android:minHeight="20dip" 
            android:padding="2dip" 
            android:progress="50" 
            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

<item android:id="@android:id/progress"> 
        <clip> 
            <shape> 
                <corners android:radius="5dip" /> 
                <gradient 
                        android:startColor="#ffffd300" 
                        android:centerColor="#ffffb600" 
                        android:centerY="0.75" 
                        android:endColor="#ffffcb00" 
                        android:angle="270" 
                /> 
            </shape> 
        </clip> 
    </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

<?xml version="1.0" encoding="utf-8"?> 
<clip 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:drawable="@drawable/drawable_resource" 
    android:clipOrientation=["horizontal" | "vertical"] 
    android:gravity=["top" | "bottom" | "left" | "right" | "center_vertical" | 
                     "fill_vertical" | "center_horizontal" | "fill_horizontal" | 
                     "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

 

<item android:id="@android:id/progress"> 
        <clip 
            android:clipOrientation="vertical" 
            android:gravity = "bottom"> 
            <shape> 
                <corners android:radius="5dip" /> 
                <gradient 
                        android:startColor="#ffffd300" 
                        android:centerColor="#ffffb600" 
                        android:centerX="0.75" 
                        android:endColor="#ffffcb00" 
                        android:angle="90" 
                /> 
            </shape> 
        </clip> 
    </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 {   
        private Paint mArcPaint;   
        private Paint mArcBGPaint;   
       
        private RectF mOval;   
        private float mSweep = 0;   
        private int mSpeedMax = 200; 
        private int mThreshold = 100; 
        private int mIncSpeedValue = http://www.mamicode.com/0; 
        private int mCurrentSpeedValue = http://www.mamicode.com/0;  
        private float mCenterX;   
        private float mCenterY;   
        private float mSpeedArcWidth;   
      
        private final float SPEED_VALUE_INC = 2;  
      
        ..........  
      
    }  

     

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); 
            mArcPaint.setStyle(Paint.Style.STROKE); 
            mArcPaint.setStrokeWidth(mSpeedArcWidth); 
    //        mPaint.setStrokeCap(Paint.Cap.ROUND); 
            mArcPaint.setColor(0xff81ccd6); 
            BlurMaskFilter mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.INNER); 
            mArcPaint.setMaskFilter(mBlur); 
             
            mArcBGPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
            mArcBGPaint.setStyle(Paint.Style.STROKE); 
            mArcBGPaint.setStrokeWidth(mSpeedArcWidth+8); 
            mArcBGPaint.setColor(0xff171717); 
             
            BlurMaskFilter mBGBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.INNER); 
          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 
    protected void onSizeChanged(int w, int h, int ow, int oh) { 
            super.onSizeChanged(w, h, ow, oh); 
            Log.i("onSizeChanged w", w+""); 
            Log.i("onSizeChanged h", h+""); 
            mCenterX = w * 0.5f;  // remember the center of the screen 
            mCenterY = h - mSpeedArcWidth; 
            mOval = new RectF(mCenterX - mCenterY, mSpeedArcWidth, mCenterX + mCenterY, mCenterY * 2); 
        } 

     

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   
        protected void onDraw(Canvas canvas) {  
            drawSpeed(canvas);  
            calcSpeed();  
        }  
      
    private void drawSpeed(Canvas canvas) {  
            canvas.drawArc(mOval, 179, 181, false, mArcBGPaint);  
      
            mSweep = (float) mIncSpeedValue / mSpeedMax * 180;  
            if (mIncSpeedValue > mThreshold) {  
                mArcPaint.setColor(0xFFFF0000);  
            }  
            else {  
                mArcPaint.setColor(0xFF00B0F0);  
            }  
              
            canvas.drawArc(mOval, 180, mSweep, false, mArcPaint);          
        }  
      
    private void calcSpeed() {  
            if (mIncSpeedValue < mCurrentSpeedValue) {  
                mIncSpeedValue += SPEED_VALUE_INC;  
                if (mIncSpeedValue > mCurrentSpeedValue) {  
                    mIncSpeedValue = mCurrentSpeedValue;  
                }  
                invalidate();  
            }  
            else if (mIncSpeedValue > mCurrentSpeedValue) {  
                mIncSpeedValue -= SPEED_VALUE_INC;  
                if (mIncSpeedValue < mCurrentSpeedValue) {  
                    mIncSpeedValue = mCurrentSpeedValue;  
                }  
                invalidate();  
            }  
        }  

     

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

 

 
原文:http://winwyf.blog.51cto.com/4561999/857867