在Android中將圖像裁剪爲圓形

Question

有誰知道如何將圖像\位圖裁剪成圓形？ 我找不到任何解決方案，抱歉..

Answer 1

與下面的代碼試試：

public Bitmap getRoundedShape(Bitmap scaleBitmapImage) { 
    // TODO Auto-generated method stub 
    int targetWidth = 50; 
    int targetHeight = 50; 
    Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, 
          targetHeight,Bitmap.Config.ARGB_8888); 

       Canvas canvas = new Canvas(targetBitmap); 
    Path path = new Path(); 
    path.addCircle(((float) targetWidth - 1)/2, 
    ((float) targetHeight - 1)/2, 
    (Math.min(((float) targetWidth), 
       ((float) targetHeight))/2), 
      Path.Direction.CCW); 

       canvas.clipPath(path); 
    Bitmap sourceBitmap = scaleBitmapImage; 
    canvas.drawBitmap(sourceBitmap, 
           new Rect(0, 0, sourceBitmap.getWidth(), 
    sourceBitmap.getHeight()), 
           new Rect(0, 0, targetWidth, 
    targetHeight), null); 
    return targetBitmap; 
} 

Answer 2

類：

public Bitmap getRoundedShape(Bitmap scaleBitmapImage) { 

    int targetWidth = 50; 
    int targetHeight = 50; 
    Bitmap targetBitmap = Bitmap.createBitmap(targetWidth, 
         targetHeight,Bitmap.Config.ARGB_8888); 
         canvas = new Canvas(targetBitmap); 
    Path path = new Path(); 
    path.addCircle(((float) targetWidth - 1)/2, 
    ((float) targetHeight - 1)/2, 
    (Math.min(((float) targetWidth), 
      ((float) targetHeight))/2), 
     Path.Direction.CCW); 

    canvas.clipPath(path); 
    Bitmap sourceBitmap = scaleBitmapImage; 
    canvas.drawBitmap(sourceBitmap, 
          new Rect(0, 0, sourceBitmap.getWidth(), 
     sourceBitmap.getHeight()), 
          new Rect(0, 0, targetWidth, 
     targetHeight), null); 
    return targetBitmap; 
    } 

查看：

<ImageView 
     android:id="@+id/imgView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_above="@+id/btnEdit" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="40dp" 
     android:background="@drawable/rounded" 
     android:adjustViewBounds="true" 
     android:gravity="center" 
     android:src="@drawable/happy"/> 

其他樣式：

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android" > 

<solid android:color="@android:color/white" /> 

<stroke 
    android:width="3dip" 
    android:color="#FF0000" /> 

<corners android:radius="10dp" /> 

<padding 
    android:bottom="0dp" 
    android:left="0dp" 
    android:right="0dp" 
    android:top="0dp" /> 

Answer 3

Romain Guy，以前是谷歌Android團隊的工程師，發表了一篇關於drawing images with rounded corners的優秀文章。這個想法可以很容易地擴展到一個圓，例如，通過改變圓角的矩形半徑，以便創建一個完整的圓。

從文章：

要生成圓形圖片，我只是寫了一個定製Drawable是 繪製使用Canvas.drawRoundRect()一個圓角矩形。竅門是 使用Paint與BitmapShader填充圓角矩形 紋理而不是簡單的顏色。下面是代碼的樣子：

BitmapShader shader; shader = new BitmapShader(bitmap, 
Shader.TileMode.CLAMP, Shader.TileMode.CLAMP); 

Paint paint = new Paint(); paint.setAntiAlias(true); 
paint.setShader(shader); 

RectF rect = new RectF(0.0f, 0.0f, width, height); 

// rect contains the bounds of the shape 
// radius is the radius in pixels of the rounded corners 
// paint contains the shader that will texture the shape 
canvas.drawRoundRect(rect, radius, radius, paint); 

Answer 4

finalBitmapShader shader = newBitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP); 
mPaint.setShader(shader); 
mBitmapWidth=mBitmap.getWidth(); 
mBitmapHeight=mBitmap.getHeight(); 
} 
@Override 
public void draw(Canvas canvas{ 
    canvas.drawOval(mRectF,mPaint); 
} 
@Override 
protected void onBoundsChange(Rect bounds) { 
    super.onBoundsChange(bounds); 
    mRectF.set(bounds); 
} 

在這裏我找到了一個示例教程在 http://androidgreeve.blogspot.in/2014/09/facebook-messanger-like-profile-image.html?m=1

Answer 5

懷斯曼設計，有一個開放源碼的通知ImageView的準備使用

https://github.com/wisemandesigns/CircularImageView

這將在您的佈局中使用XML，它讓生活更輕鬆。你可以用XML來設置源代碼，或者稍加修改就可以很容易地使用Bitmap。

聲明：我懷斯曼工作設計

Answer 6

對於有圓角的ImageView的，將您的圖像轉換成位圖，然後嘗試下面的代碼：

 private Bitmap getRoundedCroppedBitmap(Bitmap bitmap) { 
     int widthLight = bitmap.getWidth(); 
     int heightLight = bitmap.getHeight(); 

     Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),Config.ARGB_8888); 

     Canvas canvas = new Canvas(output); 
     Paint paintColor = new Paint(); 
     paintColor.setFlags(Paint.ANTI_ALIAS_FLAG); 

     RectF rectF = new RectF(new Rect(0, 0, widthLight, heightLight)); 

     canvas.drawRoundRect(rectF, widthLight/2 ,heightLight/2,paintColor); 

     Paint paintImage = new Paint(); 
     paintImage.setXfermode(new PorterDuffXfermode(Mode.SRC_ATOP)); 
     canvas.drawBitmap(bitmap, 0, 0, paintImage); 

     return output; 
    }