android:用毕加索创建圆形图像
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【中文标题】android:用毕加索创建圆形图像【英文标题】:android: create circular image with picasso 【发布时间】:2014-11-24 13:39:33 【问题描述】:有人问过这个问题,并且对我正在使用的毕加索版本做出了承诺:如何使用毕加索将圆形位图发送到 ImageView?我是毕加索的新手,我唯一用过的就是
Picasso.with(context).load(url).resize(w, h).into(imageview);
我已经找到https://gist.github.com/julianshen/5829333,但我不知道如何以一种不尴尬的方式将它与上面的行结合起来。
【问题讨论】:
您提供的链接足以回答您自己的问题。而你只需要申请 Picasso.with(activity).load(mayorShipImageLink).transform(new CircleTransform()).into(ImageView); 【参考方案1】:请先研究一下,因为有可用的答案。总之,关注This Link,仔细阅读了解如何使用。
试试这个:
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";
然后简单地应用它:
Picasso.with(activity).load(mayorShipImageLink).transform(new CircleTransform()).into(ImageView);
【讨论】:
@anirudh-sharma 确保添加这些导入: import android.graphics.Bitmap;导入 android.graphics.BitmapShader;导入android.graphics.Canvas;导入android.graphics.Paint;导入 com.squareup.picasso.Transformation; @all:如果您在 gif 图像上遇到空指针异常,check this 在 Kotlin 中也能像魅力一样工作。现有 API 的一项更改,BitmapShader.TileMode.CLAMP
不再存在,我已更新答案
DOES NOT WORK! Potential Fatal signal 6 (SIGBART),这意味着 bitmap.recycle() 实际上正在从内存中删除引用并且导致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!'
-> 中止消息:'错误,无法在此处访问无效/释放的位图! 因为它是从内存中收集的垃圾。 bitmap.recycle
用于较旧的 Android 设备,这是我的理解。【参考方案2】:
这是 support-v4 库提供的内容!调查 RoundedBitmapDrawable。无需自己动手:
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 也有一个 .transform(customTransformation) 调用,理论上你可以使用它,但是,我对此有疑问。以上工作。祝你好运!
【讨论】:
这对于方形图像非常有效。在任何图像的角半径中使用 Math.min。 imageDrawable.setCornerRadius(Math.min(imageBitmap.getWidth(), imageBitmap.getHeight()) / 2.0f); 我们是否应该在 OnSuccess() 中创建单独的线程,因为从原始位图创建圆角位图可能是一项很长的任务?【参考方案3】:毕加索有一个转换库。
只需添加 gradle 依赖项
implementation 'jp.wasabeef:picasso-transformations:2.2.1'
结束使用
Picasso.with(context)
.load(url)
.resize(w, h)
.transform(new CropCircleTransformation())
.into(imageview);
维基:Picasso Transformations
【讨论】:
这真是这个问题的完美答案,怎么票数这么少..【参考方案4】:我发现的另一个选择是这个家伙库。它可以独立工作,也可以与毕加索结合使用。我选择了毕加索路线,如下图:
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);
为我工作!
【讨论】:
【参考方案5】:我已经尝试了上面的所有解决方案,但没有一个可以让我在不裁剪图片的情况下进行圆形变换。这些解决方案仅适用于具有相同宽度和高度的图像。这是我上面的解决方案
第一 ------
Picasso.with(getActivity())
.load(url)
.error(R.drawable.image2)
.placeholder(R.drawable.ic_drawer)
.resize(200, 200)
.transform(new ImageTrans_CircleTransform())
.into(imageView1);
然后这样做--------
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";
【讨论】:
【参考方案6】:使用这个库来创建一个圆形的图像视图。 To make a circular ImageView, add this CircularImageView library to your project 并在您的布局 XML 中添加 CircularImageView
<com.pkmmte.view.CircularImageView
android:layout_
android:layout_
android:src="@drawable/image"
app:border_color="#EEEEEE"
app:border_
app:shadow="true" />`
然后使用 picasso 将所需的图像加载到这个 imageView 中。 Picasso 做了所有你不需要担心的缓存
【讨论】:
【参考方案7】:在下面的代码中包含类型为 Layer-list 的 xml 可绘制对象
<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.src中使用xml到你的ImageView
<ImageView
android:id="@+id/iconStatus"
android:layout_
android:layout_
android:layout_gravity="right"
android:src="@drawable/ic_circle_status"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"/>
【讨论】:
【参考方案8】:这个对我有用
<com.androidhub4you.crop.RoundedImageView
android:id="@+id/imageView_round"
android:layout_
android:layout_
android:layout_marginTop="15dp"
android:src="@drawable/ic_launcher" />
http://www.androidhub4you.com/2014/10/android-custom-shape-imageview-rounded.html
【讨论】:
【参考方案9】:这个正在使用当前的 Picasso 3 快照:
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()"
毕加索3要点:https://gist.github.com/G00fY2/f3fbc468570024930c1fd9eb4cec85a1
【讨论】:
【参考方案10】:Picasso v2.71828 对我有用
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()"
【讨论】:
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