Glide简单使用

• DiskCacheStrategy.NONE 什么都不缓存
• DiskCacheStrategy.SOURCE 仅仅只缓存原来的全分辨率的图像
• DiskCacheStrategy.RESULT 仅仅缓存最终的图像，即降低分辨率后的（或者是转换后的）
• DiskCacheStrategy.ALL 缓存所有版本的图像（默认行为）

仅仅缓存原来的全分辨率的图像

Glide.with(this).load(url).diskCacheStrategy(DiskCacheStrategy.SOURCE).into(imageView); 

加载圆形图片需要重写一个类

GlideRoundTransform

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;

/**
 * Created by SensYang on 2017/05/25 10:13
 */

public class GlideRoundTransform extends BitmapTransformation {

    private static float radius = 0f;

    public GlideRoundTransform(Context context) {
        this(context, 4);
    }

    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);
    }
}

调用方法：

Glide.with(mcontext).load(HttpConfig.MAIN_HOST + HttpConfig.URL_POSTER_01_GET).transform(new GlideRoundTransform(mcontext, 20)).into(holder.image);

需要更深入理解的请看大神：

http://blog.youkuaiyun.com/u013278099/article/details/50459128