使用 picasso 制作带圆角的 ImageView

Question

我知道有很多 link 可以制作 ImageView 圆角。但我正在使用 Picasso 库进行图像加载.. 我参考 link 来获得结果。但问题是我在 ListView 中使用它，对于 LIstView's 第一项 ImageView 它工作得很好，但剩下的一次转换无效。

Answer 1

我正在使用这个转换： https://gist.github.com/julianshen/5829333

Picasso.with(activity).load(url).transform(new CircleTransform()).into(imageView);

Answer 2

您可以使用 RoundedCornersTransformation class of picasso-transformations 库。

示例：

final int radius = 5;
final int margin = 5;
final Transformation transformation = new RoundedCornersTransformation(radius, margin);
Picasso.with(activity).load(url).transform(transformation).into(imageView);

Answer 3

你可以使用这个 class 来制作带有 Picasso 的圆角矩形图像视图，像这样使用它

 Picasso.with(activity).load(url).transform(new RoundedCornersTransform(this)).into(imageView);

这是 class RoundedCornersTransform。

package com.demo.picasso;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;

import com.squareup.picasso.Transformation;


public class RoundedCornersTransform implements Transformation {
@Override
public Bitmap transform(Bitmap source) {
    int size = Math.min(source.getWidth(), source.getHeight());

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

    Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
    if (squaredBitmap != source) {
        source.recycle();
    }

    Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());

    Canvas canvas = new Canvas(bitmap);
    Paint paint = new Paint();
    BitmapShader shader = new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
    paint.setShader(shader);
    paint.setAntiAlias(true);

    float r = size / 8f;
    canvas.drawRoundRect(new RectF(0, 0, source.getWidth(), source.getHeight()), r, r, paint);
    squaredBitmap.recycle();
    return bitmap;
}

@Override
public String key() {
    return "rounded_corners";
  }
}

Answer 4

我使用了 picasso-transformations 库的 RoundedCornersTransformationclass。我的列表视图中有带有视图持有者模式的自定义适配器。我在 build.gradle 中添加了以下依赖项：

dependencies {
        compile 'jp.wasabeef:picasso-transformations:2.1.0'
}

在我的 customArrayAdapter.java 中，我添加了：

Picasso.with(getContext()).load(path).transform(new RoundedCornersTransformation(10,10)).resize(175,300).into(viewHolder.ivImage);
这将同时调整大小并为您的图像提供圆角。

Answer 5

根据 and this related one，我想到了这个：

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;

import com.squareup.picasso.Transformation;


public class RoundedCornersTransform implements Transformation {
    private static Bitmap createRoundedRectBitmap(Bitmap bitmap,
                                                  float topLeftCorner, float topRightCorner,
                                                  float bottomRightCorner, float bottomLeftCorner) {
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
                Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final int color = Color.WHITE;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);
        Path path = new Path();
        float[] radii = new float[]{
                topLeftCorner, bottomLeftCorner,
                topRightCorner, topRightCorner,
                bottomRightCorner, bottomRightCorner,
                bottomLeftCorner, bottomLeftCorner
        };

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        path.addRoundRect(rectF, radii, Path.Direction.CW);
        canvas.drawPath(path, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
        return output;
    }

    @Override
    public Bitmap transform(Bitmap source) {
        int size = Math.min(source.getWidth(), source.getHeight());

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

        Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
        if (squaredBitmap != source) {
            source.recycle();
        }

        float r = size / 4f;

        Bitmap roundedBitmap = createRoundedRectBitmap(squaredBitmap, r, r, r, r);

        squaredBitmap.recycle();

        return roundedBitmap;
    }

    @Override
    public String key() {
        return "rounded_corners";
    }
}

这样使用：

Picasso.with(context).load(url).transform(new RoundedCornersTransform()).into(imageView);

虽然可能需要一些改进，所以要小心！

Answer 6

就像说 . You can use MaskTransformationclass of picasso-transformations 图书馆。

示例：

final Transformation transformation = new MaskTransformation(getContext(), R.drawable.rounded_convers_transformation);
Picasso.with(activity).load(url).transform(transformation).into(imageView);

res/drawable/rounded_convers_transformation.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
    <corners android:radius="5dp"/>
    <solid android:color="@color/black"/>
</shape>

更新：但请注意，您还应该 .resize(w,h) 图片，因为如果图片很大，则轮次将无法确定

Answer 7

基于@stevyhacker 的回答的 RoundCornerTransform 的 Kotlin 版本。

支持矩形而不是方形图像。
不需要额外的第 3 方库。

=============================================

import android.graphics.*
import com.squareup.picasso.Transformation

class RoundCornersTransform(private val radiusInPx: Float) : Transformation {

    override fun transform(source: Bitmap): Bitmap {
        val bitmap = Bitmap.createBitmap(source.width, source.height, source.config)
        val canvas = Canvas(bitmap)
        val paint = Paint(Paint.ANTI_ALIAS_FLAG or Paint.DITHER_FLAG)
        val shader = BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)
        paint.shader = shader
        val rect = RectF(0.0f, 0.0f, source.width.toFloat(), source.height.toFloat())
        canvas.drawRoundRect(rect, radiusInPx, radiusInPx, paint)
        source.recycle()

        return bitmap
    }

    override fun key(): String {
        return "round_corners"
    }

}

用法：

    Picasso.get()
        .load(imageUrl)
        .memoryPolicy(MemoryPolicy.NO_CACHE)
        .placeholder(R.drawable.image_placeholder)
        .transform(RoundCornersTransform(32.0f))
        .into(imageView, callback)

使用 picasso 制作带圆角的 ImageView

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