Android将图像转换成流存储与将流转换成图像

时间:2022-07-21 17:03:14

1、将图片转换成二进制流

public byte[] getBitmapByte(Bitmap bitmap){
ByteArrayOutputStream out = new ByteArrayOutputStream();
//参数1转换类型,参数2压缩质量,参数3字节流资源
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return out.toByteArray();
}

2、将二进制流转换成图片(Bitmap)

public Bitmap getBitmapFromByte(byte[] temp){
if(temp != null){
Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);
return bitmap;
}else{
return null;
}
}

将二进制流转换成图片(Drawable)

public Drawable getBitmapFromByte(byte[] temp){
if(temp != null){
Drawable drawable = Drawable.createFromStream(bais, "image");
return drawable ;
}else{
return null;
}
}

3、将Bitmap转换成Drawable

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;    

        }    

Drawable drawable = new FastBitmapDrawable(bitmap);  

BitmapDrawable tempDrawable = (BitmapDrawable) drawable;
tempDrawable.getBitmap();