Android中Bitmap, Drawable, Byte,ID之間的轉化

標籤：

1.  Bitmap 轉化為 byte
ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
byte[] array= out.toByteArray();

2. byte轉化為bitmap
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);

3. bitmap轉化為Drawable
Drawable drawable = new FastBitmapDrawable(bitmap);

4. Drawable轉化為bitmap
 a. BitmapDrawable, FastBitmapDrawable直接用getBitmap
 b. 其他類型的Drawable用Canvas畫到一個bitmap上
      Canvas canvas = new Canvas(bitmap)
      drawable.draw(canvas)


5.id轉化graphic.drawable

   Drawable drawable = getResources().getDrawable(R.drawable.icon);


6.id轉化成Bitmap

   Bitmap bitmap = BitmapFactory. decodeResource (Resources   res, int id)

Android中Bitmap, Drawable, Byte,ID之間的轉化