[带效果图]圆角矩形图片自定义控件

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效果图:

常用的属性类型:

属性类型名称属性类型color颜色boolean布尔类型string文本类型folat小数dimension尺寸类型（如100dp）reference引用类型(如@String)reference|color引用或者颜色
使用方法:

    <com.yt.utils.RoundRectImageView        android:layout_width="match_parent"        android:layout_height="match_parent"        app:chamfer="2" />

values/attrs:

    <declare-styleable name="RoundRectImageView">        <attr name="chamfer" format="integer" />    </declare-styleable>

代码:

package com.yt.utils;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;import com.miu.apps.miss.R;/** * yt * Created by Administrator on 2016/12/5. * 圆角图片 的自定义控件 */public class RoundRectImageView extends ImageView {    private Paint paint;    private int chamfer;    public RoundRectImageView(Context context) {        this(context,null);    }    public RoundRectImageView(Context context, AttributeSet attrs) {        this(context, attrs,0);    }    public RoundRectImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray typedArray = context.obtainStyledAttributes(attrs,                R.styleable.RoundRectImageView);        chamfer = typedArray.getInteger(R.styleable.RoundRectImageView_chamfer, 0);   //获取倒角幅度        paint  = new Paint();    }    /**     * 绘制圆角矩形图片     */    @Override    protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();        if (null != drawable) {            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();            Bitmap b = getRoundBitmap(bitmap, chamfer);            final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());            final Rect rectDest = new Rect(0,0,getWidth(),getHeight());            paint.reset();            canvas.drawBitmap(b, rectSrc, rectDest, paint);        } else {            super.onDraw(canvas);        }    }    /**     * 获取圆角矩形图片方法     * @param bitmap     * @param roundPx  倒角幅度     * @return Bitmap     */    private Bitmap getRoundBitmap(Bitmap bitmap, int roundPx) {        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),                bitmap.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final int color = 0xff424242;        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());        final RectF rectF = new RectF(rect);        paint.setAntiAlias(true);        canvas.drawARGB(0, 0, 0, 0);        paint.setColor(color);        int x = bitmap.getWidth();        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(bitmap, rect, rect, paint);        return output;    }}

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