利用BlurMaskFilter实现具有阴影效果的Imageview

来源：互联网发布：淘宝特卖网qitemei 编辑：程序博客网时间：2024/06/05 18:12

主要是BlurMaskFilter bf=new BlurMaskFilter(20,BlurMaskFilter.Blur.INNER);

设置影音大小为20，模式为Inner：解释为Blur inside the border
paint.setMaskFilter(bf);设置画笔
canvas.drawBitmap(bit.extractAlpha(paint,null),src,rect,paint);绘画影音
canvas.drawBitmap(bit,src,rect1,null);叠上原图片

import android.content.Context;import android.graphics.Bitmap;import android.graphics.BlurMaskFilter;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.support.annotation.Nullable;import android.util.AttributeSet;/** * Created by yang on 2017/8/7. */public class shadowimageview extends android.support.v7.widget.AppCompatImageView {    private Paint paint;    public shadowimageview(Context context) {        this(context,null);    }    public shadowimageview(Context context, @Nullable AttributeSet attrs) {        this(context, attrs,0);    }    public shadowimageview(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        paint=new Paint();        init();    }    private void init() {        BlurMaskFilter bf=new BlurMaskFilter(20,BlurMaskFilter.Blur.INNER);        paint.setColor(Color.GRAY);        paint.setMaskFilter(bf);    }    @Override    protected void onDraw(Canvas canvas) {        Drawable drawable=getDrawable();        Bitmap bit=((BitmapDrawable)drawable).getBitmap();        setBackgroundDrawable(null);        int x=getWidth();        int y=getHeight();        Rect rect=new Rect(20,20,x,y);        Rect rect1=new Rect(0,0,x-20,y-20);        int x2=bit.getWidth();        int y2=bit.getHeight();        Rect src=new Rect(0,0,x2,y2);        canvas.drawBitmap(bit.extractAlpha(paint,null),src,rect,paint);        canvas.drawBitmap(bit,src,rect1,null);        //super.onDraw(canvas);    }}

效果：

阅读全文

0 0