Android：使用Picasso创建圆形图像

Question

这个问题已经被问过了，并且已经为我正在使用的Picasso版本做出了承诺：如何使用Picasso将圆形位图发送到ImageView？我是Picasso的新手，唯一使用过的东西是

Picasso.with(context).load(url).resize(w, h).into(imageview);

我已经找到了https://gist.github.com/julianshen/5829333，但我不确定如何以不尴尬的方式将它与上一行结合起来。

- Katedral Pillon

---

你提供的链接已经足以回答你自己的问题了。而且你只需要应用Picasso.with(activity).load(mayorShipImageLink).transform(new CircleTransform()).into(ImageView); - lagos

Answer 1

在查找答案之前，稍微进行一些研究。无论如何，请遵循此链接并仔细阅读以了解如何使用它。

尝试这个：

import com.squareup.picasso.Transformation;

public class CircleTransform 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,
                Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        paint.setShader(shader);
        paint.setAntiAlias(true);

        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);

        squaredBitmap.recycle();
        return bitmap;
    }

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

然后就像这样应用它：

Picasso.with(activity).load(mayorShipImageLink).transform(new CircleTransform()).into(ImageView);

- Anirudh Sharma

---

请确保添加以下导入：import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Canvas; import android.graphics.Paint;import com.squareup.picasso.Transformation; - AG1

@全体成员：如果您在处理gif图片时遇到了空指针异常，请参考这里。 - Cerlin

同样在 Kotlin 中也能像魔法一样运行。对于现有的 API，只有一个更改：BitmapShader.TileMode.CLAMP 不再存在了，我已经更新了答案。 - sud007

无法工作！_潜在致命信号6（SIGBART）_，这意味着bitmap.recycle()实际上正在从内存中删除引用并导致signal 6 (SIGABRT)，code -6 (SI_TKILL)，fault addr --------11-12 00:03:47.941 29091 29091 F DEBUG：Abort message：'Error，cannot access an invalid/free'd bitmap here!' -> **Abort message: 'Error, cannot access an invalid/free'd bitmap here!**因为它被垃圾回收器从内存中清除。我理解bitmap.recycle是用于旧版Android设备的。 - Haroun Hajem

Answer 2

这里有一些由support-v4库提供的东西！看看RoundedBitmapDrawable。无需自己开发：

Picasso.with(context).load(url)
                        .resize(w, h)
                        .into(myImageView, new Callback() {
                            @Override
                            public void onSuccess() {
                                Bitmap imageBitmap = ((BitmapDrawable) myImageView.getDrawable()).getBitmap();
                                RoundedBitmapDrawable imageDrawable = RoundedBitmapDrawableFactory.create(getResources(), imageBitmap);
                                imageDrawable.setCircular(true);
                                imageDrawable.setCornerRadius(Math.max(imageBitmap.getWidth(), imageBitmap.getHeight()) / 2.0f);
                                myImageView.setImageDrawable(imageDrawable);
                            }
                            @Override
                            public void onError() {
                                myImageView.setImageResource(R.drawable.default_image);
                            }
                        });

注意：Picasso 还有一个 .transform(customTransformation) 调用，理论上您可以使用它，但是我在使用时遇到了问题。上面的代码可以正常工作，祝好运！

- goodKode

---

这将完美地适用于正方形图像。对于任何图像，在角半径中使用Math.min。imageDrawable.setCornerRadius(Math.min(imageBitmap.getWidth(), imageBitmap.getHeight()) / 2.0f); - Xplosive

我们不应该在OnSuccess()中创建单独的线程吗？因为从原始位图创建圆形位图可能是一个耗时的任务。 - HasaDev

Answer 3

有一个适用于Picasso的转换库。

只需添加Gradle依赖项即可。

implementation 'jp.wasabeef:picasso-transformations:2.4.0'

使用结束

Picasso.with(context)
       .load(url)
       .resize(w, h)
       .transform(new CropCircleTransformation())
       .into(imageview);

维基: Picasso Transformations

- Nikolay Krasilnikov

---

这真的是这个问题的完美答案，为什么票数这么少呢？ - DDisciple

Answer 4

我发现的另一个选择是这位开发者的库。它可以独立使用，也可以与 Picasso 结合使用。我选择了 Picasso 的路线，如下所示：

https://github.com/vinc3m1/RoundedImageView

Transformation transformation = new RoundedTransformationBuilder()
          .borderColor(Color.BLACK)
          .borderWidthDp(3)
          .cornerRadiusDp(30)
          .oval(false)
          .build();

Picasso.with(context)
    .load(url)
    .fit()
    .transform(transformation)
    .into(imageView);

对我很有帮助！

- Breeno

Answer 5

我已尝试上述所有解决方案，但没有一个可以在不裁剪图片的情况下给出圆形转换。那些解决方案仅适用于具有相同宽度和高度的图像。这是我的解决方案：

Picasso.with(getActivity())
            .load(url)
            .error(R.drawable.image2)
            .placeholder(R.drawable.ic_drawer)
            .resize(200, 200)
            .transform(new ImageTrans_CircleTransform())
            .into(imageView1);

那么就这样做 --------

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Shader.TileMode;

import com.squareup.picasso.Transformation;
public class ImageTrans_CircleTransform implements Transformation {
 @Override
    public Bitmap transform(Bitmap source) {
 if (source == null || source.isRecycled()) {
                return null;
            }

            final int width = source.getWidth() + borderwidth;
            final int height = source.getHeight() + borderwidth;

            Bitmap canvasBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            BitmapShader shader = new BitmapShader(source, TileMode.CLAMP, TileMode.CLAMP);
            Paint paint = new Paint();
            paint.setAntiAlias(true);
            paint.setShader(shader);

            Canvas canvas = new Canvas(canvasBitmap);
            float radius = width > height ? ((float) height) / 2f : ((float) width) / 2f;
            canvas.drawCircle(width / 2, height / 2, radius, paint);

            //border code
            paint.setShader(null);
            paint.setStyle(Paint.Style.STROKE);
            paint.setColor(bordercolor);
            paint.setStrokeWidth(borderwidth);
            canvas.drawCircle(width / 2, height / 2, radius - borderwidth / 2, paint);
            //--------------------------------------

            if (canvasBitmap != source) {
                source.recycle();
            }

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

- amit

Answer 6

使用此库来创建圆形ImageView。 要制作圆形ImageView，请将此CircularImageView库添加到您的项目中 并在您的布局XML中添加CircularImageView。

<com.pkmmte.view.CircularImageView
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:src="@drawable/image"
        app:border_color="#EEEEEE"
        app:border_width="4dp"
        app:shadow="true" />`

然后使用Picasso将所需的图像加载到此imageView中。Picasso会处理所有缓存，您不必担心它

- NIPHIN

Answer 7

使用以下代码包含类型为Layer-list的xml drawable

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/shape_status">
        <shape android:shape="oval">
            <solid android:color="@android:color/black"/>
        </shape>
    </item>
<item android:drawable="@drawable/ic_status_content"/></layer-list>

然后在Android源代码中将XML应用于您的ImageView。

 <ImageView
            android:id="@+id/iconStatus"
            android:layout_width="55dp"
            android:layout_height="55dp"
            android:layout_gravity="right"
            android:src="@drawable/ic_circle_status"
            android:layout_alignParentTop="true"
            android:layout_alignParentEnd="true"/>

- Marco Aurelio

Answer 8

@Anirudh Sharma提供了一个很好的答案。以下是他的答案翻译成Kotlin。

class CircleTransform : Transformation {
    override fun transform(source: Bitmap): Bitmap {
        val size = Math.min(source.width, source.height)
        val x = (source.width - size) / 2
        val y = (source.height - size) / 2
        val squaredBitmap = Bitmap.createBitmap(source, x, y, size, size)
        if (squaredBitmap != source) {
            source.recycle()
        }
        val bitmap = Bitmap.createBitmap(size, size, source.config)
        val canvas = Canvas(bitmap)
        val paint = Paint()
        val shader = BitmapShader(
            squaredBitmap,
            Shader.TileMode.CLAMP, Shader.TileMode.CLAMP
        )
        paint.shader = shader
        paint.isAntiAlias = true
        val r = size / 2f
        canvas.drawCircle(r, r, r, paint)
        squaredBitmap.recycle()
        return bitmap
    }

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

- Max

Answer 9

这个与当前的Picasso 3快照一起工作：

class CircleTransformation : Transformation {

  override fun transform(source: RequestHandler.Result): RequestHandler.Result {
    if (source.bitmap == null) {
      return source
    }

    var bitmap: Bitmap

    // since we cant transform hardware bitmaps create a software copy first
    if (VERSION.SDK_INT >= VERSION_CODES.O && source.bitmap!!.config == Config.HARDWARE) {
      val softwareCopy = source.bitmap!!.copy(Config.ARGB_8888, true)
      if (softwareCopy == null) {
        return source
      } else {
        bitmap = softwareCopy
        source.bitmap!!.recycle()
      }
    } else {
      bitmap = source.bitmap!!
    }

    var size = bitmap.width
    // if bitmap is non-square first create square one
    if (size != bitmap.height) {
      var sizeX = size
      var sizeY = bitmap.height
      size = Math.min(sizeY, sizeX)
      sizeX = (sizeX - size) / 2
      sizeY = (sizeY - size) / 2

      val squareSource = Bitmap.createBitmap(bitmap, sizeX, sizeY, size, size)
      bitmap.recycle()
      bitmap = squareSource
    }

    val circleBitmap = Bitmap.createBitmap(size, size, Config.ARGB_8888)
    val canvas = Canvas(circleBitmap)
    val paint = Paint()
    val shader = BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)

    paint.shader = shader
    paint.isAntiAlias = true
    val centerAndRadius = size / 2f
    canvas.drawCircle(centerAndRadius, centerAndRadius, centerAndRadius, paint)

    bitmap.recycle()
    return RequestHandler.Result(circleBitmap, source.loadedFrom, source.exifRotation)
  }

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

Picasso3 要点: https://gist.github.com/G00fY2/f3fbc468570024930c1fd9eb4cec85a1

- G00fY

Answer 10

这是我在使用Picasso v2.71828时的解决方案

class CircleTransform : Transformation {
override fun transform(source: Bitmap?): Bitmap? {
    if (source == null) {
        return source
    }

    var bitmap: Bitmap

    // since we cant transform hardware bitmaps create a software copy first
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && source.config == Bitmap.Config.HARDWARE) {
        val softwareCopy = source.copy(Bitmap.Config.ARGB_8888, true)
        if (softwareCopy == null) {
            return source
        } else {
            bitmap = softwareCopy
            source.recycle()
        }
    } else {
        bitmap = source
    }

    var size = bitmap.width
    // if bitmap is non-square first create square one
    if (size != bitmap.height) {
        var sizeX = size
        var sizeY = bitmap.height
        size = Math.min(sizeY, sizeX)
        sizeX = (sizeX - size) / 2
        sizeY = (sizeY - size) / 2

        val squareSource = Bitmap.createBitmap(bitmap, sizeX, sizeY, size, size)
        bitmap.recycle()
        bitmap = squareSource
    }

    val circleBitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888)
    val canvas = Canvas(circleBitmap)
    val paint = Paint()
    val shader = BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP)

    paint.shader = shader
    paint.isAntiAlias = true
    val centerAndRadius = size / 2f
    canvas.drawCircle(centerAndRadius, centerAndRadius, centerAndRadius, paint)

    bitmap.recycle()
    return circleBitmap
}


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

}

- chabislav