Android 圖像處理(類型轉換,比例縮放,倒影,圓角)的小例子

更新時間：2013年05月31日 10:11:13 作者：

Android 圖像處理(類型轉換,比例縮放,倒影,圓角)的小例子，需要的朋友可以參考一下

1.放大縮小圖片

public static Bitmap zoomBitmap(Bitmap bitmap,int w,int h){
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        Matrix matrix = new Matrix();
        float scaleWidht = ((float)w / width);
        float scaleHeight = ((float)h / height);
        matrix.postScale(scaleWidht, scaleHeight);
        Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
        return newbmp;
    }

2.獲得圓角圖片的方法

復制代碼代碼如下:

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){

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

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;
    }

3.獲得帶倒影的圖片方法

復制代碼代碼如下:

public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap){    
       final int reflectionGap = 4;    
       int width = bitmap.getWidth();    
       int height = bitmap.getHeight();    

       Matrix matrix = new Matrix();    
       matrix.preScale(1, -1);    

       Bitmap reflectionImage = Bitmap.createBitmap(bitmap,0, height/2, width, height/2, matrix, false);    

       Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height/2), Config.ARGB_8888);    

       Canvas canvas = new Canvas(bitmapWithReflection);    
       canvas.drawBitmap(bitmap, 0, 0, null);    
       Paint deafalutPaint = new Paint();    
       canvas.drawRect(0, height,width,height + reflectionGap, deafalutPaint);    

       canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);    

       Paint paint = new Paint();    
       LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, 
　　　　 bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);    
        paint.setShader(shader);    
        // Set the Transfer mode to be porter duff and destination in    
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));    
        // Draw a rectangle using the paint with our linear gradient    
        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()    
                + reflectionGap, paint);    

        return bitmapWithReflection;    
    } 

4.將Drawable轉化為Bitmap

復制代碼代碼如下:

public static Bitmap drawableToBitmap(Drawable drawable){
      int width = drawable.getIntrinsicWidth();
      int height = drawable.getIntrinsicHeight();
      Bitmap bitmap = Bitmap.createBitmap(width, height,
      drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888: Bitmap.Config.RGB_565);
      Canvas canvas = new Canvas(bitmap);
      drawable.setBounds(0,0,width,height);
      drawable.draw(canvas);
      return bitmap;
}

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