更改图像的宽度和高度

Question

我想更改图像的高度和宽度。使用canvas显示图像：

canvas.drawBitmap (_image, 0, 0, null); 

如何更改位图的大小？

Answer 1

采用了矩阵：

int width = bitmap.getWidth(); 
int height = bitmap.getHeight(); 

float scaleWidth = ((float) newWidth)/width; 
float scaleHeight = ((float) newHeight)/height;  

matrix = new Matrix(); 

matrix.postScale(scaleWidth, scaleHeight); 

Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, 
        width, height, matrix, true); 

Answer 2

或者Bitmap.createScaledBitmap(...)