Android自定义Drawable实现圆形和圆角
本文实例为大家分享了自定义Drawable实现圆形和圆角的具体代码，供大家参考，具体内容如下
圆形
packagecom.customview.widget;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapShader;
importandroid.graphics.Canvas;
importandroid.graphics.ColorFilter;
importandroid.graphics.Paint;
importandroid.graphics.PixelFormat;
importandroid.graphics.Shader;
importandroid.graphics.drawable.Drawable;
importandroid.support.annotation.IntRange;
importandroid.support.annotation.NonNull;
importandroid.support.annotation.Nullable;
/**
*自定义Drawable实现圆形图片
*Createdbyhust_twjon2017/9/26.
*/
publicclassCircleDrawableextendsDrawable{
privatePaintmPaint;
privateintmWidth;//宽/高，直径
privateBitmapmBitmap;
publicCircleDrawable(Bitmapbitmap){
this.mBitmap=bitmap;
BitmapShaderbitmapShader=newBitmapShader(mBitmap,Shader.TileMode.CLAMP,Shader.TileMode.CLAMP);//着色器水平和竖直都需要填充满
mPaint=newPaint();
mPaint.setAntiAlias(true);
mPaint.setShader(bitmapShader);
mWidth=Math.min(mBitmap.getWidth(),mBitmap.getHeight());//宽高的最小值作为直径
}
@Override
publicvoiddraw(@NonNullCanvascanvas){
canvas.drawCircle(mWidth/2,mWidth/2,mWidth/2,mPaint);//绘制圆形
}
@Override
publicvoidsetAlpha(@IntRange(from=0,to=255)inti){
mPaint.setAlpha(i);
}
@Override
publicvoidsetColorFilter(@NullableColorFiltercolorFilter){
mPaint.setColorFilter(colorFilter);
}
@Override
publicintgetOpacity(){
returnPixelFormat.TRANSLUCENT;//设置系统默认，让drawable支持和窗口一样的透明度
}
//还需要从重写以下2个方法，返回drawable实际宽高
@Override
publicintgetIntrinsicWidth(){
returnmWidth;
}
@Override
publicintgetIntrinsicHeight(){
returnmWidth;
}
}
圆角：
packagecom.customview.widget;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapShader;
importandroid.graphics.Canvas;
importandroid.graphics.ColorFilter;
importandroid.graphics.Paint;
importandroid.graphics.PixelFormat;
importandroid.graphics.RectF;
importandroid.graphics.Shader;
importandroid.graphics.drawable.Drawable;
importandroid.support.annotation.IntRange;
importandroid.support.annotation.NonNull;
importandroid.support.annotation.Nullable;
/**
*自定义Drawable实现圆角图片
*Createdbyhust_twjon2017/9/26.
*/
publicclassRoundCornerDrawableextendsDrawable{
privatePaintmPaint;
privateRectFrectF;//定义矩形区域
privateBitmapmBitmap;
publicRoundCornerDrawable(Bitmapbitmap){
this.mBitmap=bitmap;
BitmapShaderbitmapShader=newBitmapShader(mBitmap,Shader.TileMode.CLAMP,Shader.TileMode.CLAMP);//着色器水平和竖直都需要填充满
mPaint=newPaint();
mPaint.setAntiAlias(true);
mPaint.setShader(bitmapShader);
//rectF=newRectF(0,0,bitmap.getWidth(),bitmap.getHeight());
}
@Override
publicvoiddraw(@NonNullCanvascanvas){
//RectF:圆角矩形区域
canvas.drawRoundRect(newRectF(0,0,mBitmap.getWidth(),mBitmap.getHeight()),100,100,mPaint);//rx：x方向上的圆角半径;ry：y方向上的圆角半径。
}
/*@Override
publicvoidsetBounds(intleft,inttop,intright,intbottom){
super.setBounds(left,top,right,bottom);
rectF=newRectF(left,top,right,bottom);
}*/
@Override
publicvoidsetAlpha(@IntRange(from=0,to=255)inti){
mPaint.setAlpha(i);
}
@Override
publicvoidsetColorFilter(@NullableColorFiltercolorFilter){
mPaint.setColorFilter(colorFilter);
}
@Override
publicintgetOpacity(){
returnPixelFormat.TRANSLUCENT;//设置系统默认，让drawable支持和窗口一样的透明度
}
//还需要从重写以下2个方法，返回drawable实际宽高
@Override
publicintgetIntrinsicWidth(){
returnmBitmap.getWidth();
}
@Override
publicintgetIntrinsicHeight(){
returnmBitmap.getHeight();
}
}
MainActivity中：
Bitmapbitmap=BitmapFactory.decodeResource(getResources(),R.drawable.XXX); imageView.setImageDrawable(newRoundCornerDrawable(bitmap));
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。