Glide加载圆角、圆形图片

最新推荐文章于 2025-05-20 16:57:12 发布

原创最新推荐文章于 2025-05-20 16:57:12 发布 · 597 阅读

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#图片 #Glide #android

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本文介绍如何使用Glide加载圆形及圆角图片，通过重写BitmapTransformation实现自定义图片转换效果。包括创建圆形图片和指定圆角半径的方法。

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有时候头像需求带圆角或者是圆形头像，而Glide本身并不具备自己加载圆形图片的功能，所以需要重写BitmapTransformation来达到需求

//加载圆形图片
public class GlideGetCircle extends BitmapTransformation {
    public GlideGetCircle(Context context) {
        super(context);
    }

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

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;

        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);

        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override public String getId() {
        return getClass().getName();
    }
}

//加载带圆角的图片
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);
    }
}

//在MainActivity中加载圆形图片，主要代码如下：
private ImageView imageView;
private RequestManager glideRequest;  

imageView = (ImageView) findViewById(R.id.imageView);
glideRequest = Glide.with(this);


//加载普通图片
glideRequest.load("图片url").into(imageView);
//加载圆角图片
glideRequest.load("图片url").transform(new GlideRoundTransform(context)).into(imageView);
//指定圆角半径
glideRequest.load("图片url").transform(new GlideRoundTransform(context, 10)).into(imageView);
//加载圆形图片
glideRequest.load("图片url").transform(new GlideGetCircle(context)).into(imageView);

好啦，这样就可以干净利落的实现加载圆形或者圆角图片的需求啦