Android 实现画图并保存图片

核心提示：float scaleWidth = ( ( float ) destWidth ) / w;//宽度缩小比例float scaleHeight = ( ( float ) destHeigth ) / h;//高度缩小比例Log.d( tag, "bitmap width is :" + w );

float scaleWidth = ( ( float ) destWidth ) / w;//宽度缩小比例

float scaleHeight = ( ( float ) destHeigth ) / h;//高度缩小比例

Log.d( tag, "bitmap width is :" + w );

Log.d( tag, "bitmap height is :" + h );

Log.d( tag, "new width is :" + destWidth );

Log.d( tag, "new height is :" + destHeigth );

Log.d( tag, "scale width is :" + scaleWidth );

Log.d( tag, "scale height is :" + scaleHeight );

Matrix m = new Matrix();//矩阵

m.postScale( scaleWidth, scaleHeight );//设置矩阵比例

Bitmap resizedBitmap = Bitmap.createBitmap( src, 0, 0, w, h, m, true );//直接按照矩阵的比例把源文件画入进行

return resizedBitmap;

}