如何用我自己的尺寸绘制位图？

Question

我想根据稍后将要设置的尺寸绘制一些图片。但是familliar，唯一的方法IM是下列之一：

canvas.drawBitmap(test, canvas.getWidth()/2 - test.getWidth()/2, canvas.getHeight()/2 - test.getHeight()/2, null); 

只绘制位图accordign到图像尺寸，所以我的问题是，是否有画有不同的尺寸或只是一种方法的位图的另一种方法改变它？

谢谢！

Answer 1

使用下面的代码来调整位图与您选择的尺寸：

public static Bitmap decodeSampledBitmapFromPath(String path, int reqWidth, 
      int reqHeight) { 

    final BitmapFactory.Options options = new BitmapFactory.Options(); 
    options.inJustDecodeBounds = true; 
    BitmapFactory.decodeFile(path, options); 

    options.inSampleSize = calculateInSampleSize(options, reqWidth, 
      reqHeight); 

    // Decode bitmap with inSampleSize set 
    options.inJustDecodeBounds = false; 
    Bitmap bmp = BitmapFactory.decodeFile(path, options); 
    return bmp; 
} 

public static int calculateInSampleSize(BitmapFactory.Options options, 
     int reqWidth, int reqHeight) { 

    final int height = options.outHeight; 
    final int width = options.outWidth; 
    int inSampleSize = 1; 

    if (height > reqHeight || width > reqWidth) { 
     if (width > height) { 
       inSampleSize = Math.round((float) height/(float) reqHeight); 
     } else { 
       inSampleSize = Math.round((float) width/(float) reqWidth); 
     } 
    } 
return inSampleSize; 
}