Drawable、 Bitmap、byte[] 的相互转换

最新推荐文章于 2025-07-31 11:51:51 发布

转载最新推荐文章于 2025-07-31 11:51:51 发布 · 475 阅读

本文介绍了在Android开发中如何实现Drawable与Bitmap之间的相互转换，并提供了从资源文件获取Bitmap的方法，同时还展示了Bitmap与byte数组互相转换的具体实现。

1. Drawable --> Bitmap
public static Bitmap drawableToBitmap(Drawable drawable){
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_888 : Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0,0,drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}

2. Bitmap ---> Drawable

Bitmap bitmap = new Bitmap (...);

Drawable drawable = new BitmapDrawable(bitmap);

3. 从资源中获取Bitmap

Resources res = getResources();
Bitmap bm = BitmapFactory.decodeResource(res,R.drawable.pic);
4. Bitmap --> byte[]
private byte[] Bitmap2Bytes(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG,100,baos);
return baos.toByteArray();
}
5. byte[] --> Bitmap

private Bitmap Bytes2Bitmap(byte[] b) {

if(b.length != 0)
return BitmapFactory.decodeByteArray(b,0,b.length);
else
return null;
}

来自:

http://blog.youkuaiyun.com/aduovip/article/details/6834735