Glide 繪制邊框

圓形Glide 內部已經實現蝴罪。但描邊效果需要我們自己繪制具壮。在項目當中使用 CircleImageView 實現該效果之碗，但是Glide 與 CircleImageView 組合使用重現種種問題坦刀，雖說網上有相關解決方案虽填，但是想想還是從根源上解決吞彤，為此我們需要 繼承BitmapTransformation 我衬，重寫 transform 實現前述所說效果。直接看實現：
效果圖如下：

這里寫圖片描述

圓形描邊效果實現饰恕。

代碼：

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;

import java.security.MessageDigest;

import jp.wasabeef.glide.transformations.BitmapTransformation;

/**
 * Glide 的圖形變換可參考Glide 示例源碼
 * {@link com.bumptech.glide.load.resource.bitmap.CenterCrop}
 * {@link com.bumptech.glide.load.resource.bitmap.BitmapTransformation}
 *
 */

public class GlideCircleBorderTransform extends BitmapTransformation {
    private final String ID = getClass().getName();
    private Paint mBorderPaint;
    private float borderWidth;
    private int borderColor;


    public GlideCircleBorderTransform(float borderWidth, int borderColor) {
        this.borderWidth = borderWidth;
        this.borderColor = borderColor;
        mBorderPaint = new Paint();
        mBorderPaint.setColor(borderColor);
        mBorderPaint.setStyle(Paint.Style.STROKE);
        mBorderPaint.setAntiAlias(true);
        mBorderPaint.setStrokeWidth(borderWidth);
        mBorderPaint.setDither(true);

    }

    @Override
    protected Bitmap transform(Context context, BitmapPool bitmapPool, Bitmap bitmap, int i, int i1) {
        return circleCrop(bitmapPool, bitmap);
    }

    private Bitmap circleCrop(BitmapPool bitmapPool, Bitmap source) {
        
        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;
        Bitmap square = Bitmap.createBitmap(source, x, y, size, size);
        Bitmap result = bitmapPool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }

        //畫圖
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        //設置 Shader
        paint.setShader(new BitmapShader(square, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float radius = size / 2f;
        //繪制一個圓
        canvas.drawCircle(radius, radius, radius, paint);


        /************************描邊*********************/
        //注意：避免出現描邊被屏幕邊緣裁掉
        float borderRadius = radius - (borderWidth / 2);
        //畫邊框
        canvas.drawCircle(radius, radius, borderRadius, mBorderPaint);
        return result;
    }

    @Override
    public void updateDiskCacheKey(MessageDigest messageDigest) {
        messageDigest.update(ID.getBytes(CHARSET));
    }

    @Override
    public boolean equals(Object o) {
        return o instanceof GlideCircleBorderTransform;
    }

    @Override
    public int hashCode() {
        return ID.hashCode();
    }
}

使用：

    /**
     * 加載圖片-- 圓形+描邊展示---不展示漸進動畫
     * @param glideContextWrapper
     * @param imageView
     * @param url
     * @param borderWidth
     * @param borderColor
     * @param placeholder
     */
    public static void loadCircle(GlideContextWrapper glideContextWrapper, ImageView imageView, String url, float borderWidth, int borderColor,@IdRes int placeholder) {
        RequestOptions options = new RequestOptions()
                .placeholder(placeholder)
                .fallback(placeholder)
                .centerCrop()
                .bitmapTransform(new GlideCircleBorderTransform(borderWidth, borderColor))
                .diskCacheStrategy(DiskCacheStrategy.DATA);
        ImageLoader.getRequestManager(glideContextWrapper)
                .load(url)
                .apply(options)
                .into(imageView);
    }

詳情見：https://blog.csdn.net/wlytctw/article/details/81740915