機器人試圖圓位圖的角落

Question

我有一個ImageView的和我試圖創建圓角，嘗試了所有從這個職位的解決方案：How to make an ImageView with rounded corners?但是毫無效果。這裏是我的XML

<RelativeLayout 
    android:id="@+id/RL_ImageHolder" 
    android:layout_width="150dp" 
    android:layout_height="180dp" 
    android:layout_alignBottom="@+id/relativeLayout2" 
    android:layout_alignParentLeft="true" 
    android:layout_alignTop="@+id/relativeLayout2" 
    android:layout_marginLeft="10dp" > 

    <ImageView 
     android:id="@+id/imgPreview" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     android:contentDescription="Preview" 

     /> 
</RelativeLayout> 

這就是我如何使用在帖子中提到的方法我上面鏈接設置的ImageView：

圖像設置正確，但它使一個矩形。任何想法，爲什麼它不工作？

編輯：剛剛發現，只有當持有圖像的佈局具有固定的寬度/高度時才起作用。想一想如何管理它。謝謝你們

Answer 1

嘗試用下面的代碼片段：

public static Bitmap GetCurveImage(Bitmap bitmap) { 
     // Bitmap myCoolBitmap = ... ; // <-- Your bitmap you 
     // want rounded 
     int w = bitmap.getWidth(), h = bitmap.getHeight(); 

     // We have to make sure our rounded corners have an 
     // alpha channel in most cases 
     Bitmap rounder = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
     Canvas canvas = new Canvas(rounder); 

     // We're going to apply this paint eventually using a 
     // porter-duff xfer mode. 
     // This will allow us to only overwrite certain pixels. 
     // RED is arbitrary. This 
     // could be any color that was fully opaque (alpha = 
     // 255) 
     Paint xferPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 
     xferPaint.setColor(Color.RED); 

     // We're just reusing xferPaint to paint a normal 
     // looking rounded box, the 20.f 
     // is the amount we're rounding by. 
     canvas.drawRoundRect(new RectF(0, 0, w, h), 5.0f, 5.0f, xferPaint); 

     // Now we apply the 'magic sauce' to the paint 
     xferPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); 

     Bitmap result = Bitmap.createBitmap(bitmap.getWidth(), 
       bitmap.getHeight(), Bitmap.Config.ARGB_8888); 
     Canvas resultCanvas = new Canvas(result); 
     resultCanvas.drawBitmap(bitmap, 0, 0, null); 
     resultCanvas.drawBitmap(rounder, 0, 0, xferPaint); 

     return result; 
    } 

希望它會幫助你。