Android自定义圆角ImageView控件

2024-02-24 08:15:06 162

目前一些比较火的图片加载库虽然支持圆角加载,若你是接的别人作了一半的项目,刚好别人用的图片加载库刚好不支持圆角加载,那么这颗控件你值得拥有.(支持网络图片的加载)

1.创建CustomImageView类在你的项目中(源码如下)

importandroid.content.Context;
importandroid.content.res.TypedArray;
importandroid.graphics.Bitmap;
importandroid.graphics.Bitmap.Config;
importandroid.graphics.BitmapFactory;
importandroid.graphics.Canvas;
importandroid.graphics.Matrix;
importandroid.graphics.Paint;
importandroid.graphics.PorterDuff;
importandroid.graphics.PorterDuffXfermode;
importandroid.graphics.RectF;
importandroid.graphics.drawable.BitmapDrawable;
importandroid.graphics.drawable.Drawable;
importandroid.util.AttributeSet;
importandroid.widget.ImageView;

importcom.towatt.charge.towatt.R;

/**
*@authorMr.lynn
*@version1.0

*图片圆角实现
*/
publicclassCustomImageViewextendsandroid.support.v7.widget.AppCompatImageView{
privatePaintpaint;
privatePaintpaintBorder;
privateBitmapmSrcBitmap;
/**
*圆角的弧度
*/
privatefloatmRadius;
privatebooleanmIsCircle;

publicCustomImageView(finalContextcontext){
this(context,null);
}

publicCustomImageView(Contextcontext,AttributeSetattrs){
this(context,attrs,R.attr.customImageViewStyle);
}

publicCustomImageView(Contextcontext,AttributeSetattrs,intdefStyle){
super(context,attrs,defStyle);
TypedArrayta=context.obtainStyledAttributes(attrs,
R.styleable.CustomImageView,defStyle,0);
mRadius=ta.getDimension(R.styleable.CustomImageView_radius,0);
mIsCircle=ta.getBoolean(R.styleable.CustomImageView_circle,false);
intsrcResource=attrs.getAttributeResourceValue(
"http://schemas.android.com/apk/res/android","src",0);
if(srcResource!=0)
mSrcBitmap=BitmapFactory.decodeResource(getResources(),
srcResource);
ta.recycle();
paint=newPaint();
paint.setAntiAlias(true);
paintBorder=newPaint();
paintBorder.setAntiAlias(true);
}

@Override
publicvoidonDraw(Canvascanvas){
intwidth=canvas.getWidth()-getPaddingLeft()-getPaddingRight();
intheight=canvas.getHeight()-getPaddingTop()-getPaddingBottom();
Bitmapimage=drawableToBitmap(getDrawable());
if(mIsCircle){
BitmapreSizeImage=reSizeImageC(image,width,height);
canvas.drawBitmap(createCircleImage(reSizeImage,width,height),
getPaddingLeft(),getPaddingTop(),null);

}else{

BitmapreSizeImage=reSizeImage(image,width,height);
canvas.drawBitmap(createRoundImage(reSizeImage,width,height),
getPaddingLeft(),getPaddingTop(),null);
}
}

/**
*画圆角
*
*@paramsource
*@paramwidth
*@paramheight
*@return
*/
privateBitmapcreateRoundImage(Bitmapsource,intwidth,intheight){
Paintpaint=newPaint();
paint.setAntiAlias(true);
Bitmaptarget=Bitmap.createBitmap(width,height,Config.ARGB_8888);
Canvascanvas=newCanvas(target);
RectFrect=newRectF(0,0,width,height);
canvas.drawRoundRect(rect,mRadius,mRadius,paint);
//核心代码取两个图片的交集部分
paint.setXfermode(newPorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source,0,0,paint);
returntarget;
}

/**
*画圆
*
*@paramsource
*@paramwidth
*@paramheight
*@return
*/
privateBitmapcreateCircleImage(Bitmapsource,intwidth,intheight){

Paintpaint=newPaint();
paint.setAntiAlias(true);
Bitmaptarget=Bitmap.createBitmap(width,height,Config.ARGB_8888);
Canvascanvas=newCanvas(target);
canvas.drawCircle(width/2,height/2,Math.min(width,height)/2,
paint);
//核心代码取两个图片的交集部分
paint.setXfermode(newPorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source,(width-source.getWidth())/2,
(height-source.getHeight())/2,paint);
returntarget;

}

@Override
protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){
intwidth=MeasureSpec.getSize(widthMeasureSpec);
intheight=MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(width,height);
}

/**
*drawable转bitmap
*
*@paramdrawable
*@return
*/
privateBitmapdrawableToBitmap(Drawabledrawable){
if(drawable==null){
if(mSrcBitmap!=null){
returnmSrcBitmap;
}else{
returnnull;
}
}elseif(drawableinstanceofBitmapDrawable){
return((BitmapDrawable)drawable).getBitmap();
}
Bitmapbitmap=Bitmap.createBitmap(drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),Bitmap.Config.ARGB_8888);
Canvascanvas=newCanvas(bitmap);
drawable.setBounds(0,0,canvas.getWidth(),canvas.getHeight());
drawable.draw(canvas);
returnbitmap;
}

/**
*重设Bitmap的宽高
*
*@parambitmap
*@paramnewWidth
*@paramnewHeight
*@return
*/
privateBitmapreSizeImage(Bitmapbitmap,intnewWidth,intnewHeight){
intwidth=bitmap.getWidth();
intheight=bitmap.getHeight();
//计算出缩放比
floatscaleWidth=((float)newWidth)/width;
floatscaleHeight=((float)newHeight)/height;
//矩阵缩放bitmap
Matrixmatrix=newMatrix();

matrix.postScale(scaleWidth,scaleHeight);
returnBitmap.createBitmap(bitmap,0,0,width,height,matrix,true);
}

/**
*重设Bitmap的宽高
*
*@parambitmap
*@paramnewWidth
*@paramnewHeight
*@return
*/
privateBitmapreSizeImageC(Bitmapbitmap,intnewWidth,intnewHeight){
intwidth=bitmap.getWidth();
intheight=bitmap.getHeight();
intx=(newWidth-width)/2;
inty=(newHeight-height)/2;
if(x>0&&y>0){
returnBitmap.createBitmap(bitmap,0,0,width,height,null,true);
}

floatscale=1;

if(width>height){
//按照宽度进行等比缩放
scale=((float)newWidth)/width;

}else{
//按照高度进行等比缩放
//计算出缩放比
scale=((float)newHeight)/height;
}
Matrixmatrix=newMatrix();
matrix.postScale(scale,scale);
returnBitmap.createBitmap(bitmap,0,0,width,height,matrix,true);
}
}

2.在values目录下创建attrs.xml(若是已存在该文件)直接复制如下代码既可

3.正确的使用方式(在布局文件中)

注意此路径是你控件所在包

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

Android自定义圆角ImageView控件

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