Bitmap转Drawable
Bitmap bm=xxx;
BitmapDrawable bd=new BitmapDrawable(bm);
因为BtimapDrawable是Drawable的子类，最终直接使用bd对象即可。
Drawable转Bitmap
Drawable d=xxx;
BitmapDrawable bd = (BitmapDrawable) d;
Bitmap bm = bd.getBitmap();
最终bm就是我们需要的Bitmap对象了。
从资源中获取Bitmap
public static Bitmap getBitmapFromResources(Activity act, int resId) {
Resources res = act.getResources();
return BitmapFactory.decodeResource(res, resId);
}
byte[] → Bitmap
public static Bitmap convertBytes2Bimap(byte[] b) {
if (b.length == 0) {
return null;
}
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
Bitmap → byte[]
public static byte[] convertBitmap2Bytes(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
Drawable → Bitmap
public static Bitmap convertDrawable2BitmapByCanvas(Drawable drawable) {
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight(),drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
// canvas.setBitmap(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}