android byte[]数组，bitmap，drawable之间的相互转换

Byte[]转Bitmap

1. BitmapFactory.decodeByteArray(data, 0, data.length);

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Bitmap转Byte[]

1. ByteArrayOutputStream baos = new ByteArrayOutputStream();
   
2. bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
   
3. data2 = baos.toByteArray();

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2、Bitmap转Drawable

1. Bitmap bm=xxx; //xxx根据你的情况获取
   
2. BitmapDrawable bd=BitmapDrawable(bm);

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BtimapDrawable是Drawable的子类

3、 Drawable转Bitmap

1. Drawable d=xxx; //xxx根据自己的情况获取drawable
   
2. BitmapDrawable bd = (BitmapDrawable) d;
   
3. Bitmap bm = bd.getBitmap();

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