Android原生控件只有横向进度条一种,并且无法变换样式,好比原生rom的样子android

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,好比canvas

ok,咱们开始吧:ide
一)变换前背景布局
先来看看progressbar的属性:spa
- <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",咱们找到源码中的style.xml设计
- <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orm
<item name="android:progressDrawable">@android:drawable/progress_horizontal</item> xml
木有,继续发掘源码,找到drawable下面的progress_horizontal.xml,这就是咱们今天的主角了:blog
- <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"木有图片
把这个文件复制到本身工程下的drawable,就能够为所欲为的修改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
而后回到布局中
- <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,四角仍是有圆倒角的,貌似是系统本身加上去的,总之个人图片里面是没有作这个倒角处理的
二)纵向进度条
仍是得从源码入手,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>
为何shape外面要包一层clip呢,官方文档解释是clipdrawable是能够自我复制的,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
那咱们试试改为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改成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,用的也很少,最多也就仪表盘用用,否则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
- 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 = 0;
- private int mCurrentSpeedValue = 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,而后是一些控制参数好比sweep圆弧扫过的角度,xy坐标等等
- mArcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
- mArcPaint.setStyle(Paint.Style.STROKE);
- mArcPaint.setStrokeWidth(mSpeedArcWidth);
- 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,能够本身尝试
- @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;
- mCenterY = h - mSpeedArcWidth;
- mOval = new RectF(mCenterX - mCenterY, mSpeedArcWidth, mCenterX + mCenterY, mCenterY * 2);
- }
重写父类View的onSizeChanged,为的是本身根据布局中的大小作居中处理
- @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
经过计算mSweep = (float) mIncSpeedValue / mSpeedMax * 180;
而后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,还能够设定不一样的 颜色:
if (mIncSpeedValue > mThreshold) {
mArcPaint.setColor(0xFFFF0000);
}
else {
mArcPaint.setColor(0xFF00B0F0);
}
calcSpeed经过一个步进来控制增量或减量,以使弧度天然过渡,减小跳跃
ok,大功告成
