合并两个图片

public static Bitmap overlay(Bitmap bmp1, Bitmap bmp2) { 
        Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(), bmp1.getHeight(), bmp1.getConfig()); 
        Canvas canvas = new Canvas(bmOverlay); 
        canvas.drawBitmap(bmp1, new Matrix(), null); 
        canvas.drawBitmap(bmp2, 0, 0, null); 
        return bmOverlay; 
    } 

如果要缩小比例

Bitmap scaledBitmap = Bitmap.createScaledBitmap(src, dstWidth, dstHeight, filter);