Glide 3.x設定圓角圖檔

 Glide 加載圖檔非常友善，但是有時候需要加載一些圓角圖檔，這就需要自定義一下BitmapTransformation ，然後在使用時引用就可以了：

package com.zhiyou.aifeng.mehooh.utils;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;

/**
 * com.zhiyou.aifeng.mehooh.utils
 * love
 * 11:52
 **/
public class GlideRoundTransform extends BitmapTransformation {

    private static float radius = 0f;

    public GlideRoundTransform(Context context) {
        this(context, 0);
    }

    public GlideRoundTransform(Context context, int dp) {
        super(context);
        this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return roundCrop(pool, toTransform);
    }

    private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {
        if (source == null) {
            return null;
        }
        Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return result;
    }

    @Override
    public String getId() {
        return getClass().getName() + Math.round(radius);
    }
}
           

 使用方法：

Glide.with(App.getContext()).load(bean.getHeadImage())
                .dontAnimate()
                .placeholder(R.drawable.default_image)
                .error(R.drawable.default_image)
                .transform(new CenterCrop(App.getContext()),new GlideRoundTransform(App.getContext(),10))
                .into(headIv);
           

可以發現我将CenterCrop放到transform（）裡面了，這個是因為，如果放在外面的話，就隻能實作一種效果，即如果是圓角在後面的話就隻會實作圓角，而中間裁剪就會被覆寫掉，這樣做就能避免ccenterCrop的效果被覆寫。