If the goal is to convert an Android Bitmap to a libgdx Texture, you don’t need to use Pixmap at all. You can do it directly with the help of simple OpenGL and Android GLUtils. Try the followings; it is 100x faster than your solution. I assume that you are not in the rendering thread (you should not most likely). If you are, you don’t need to call postRunnable().
Gdx.app.postRunnable(new Runnable() {
@Override
public void run() {
Texture tex = new Texture(bitmap.getWidth(), bitmap.getHeight(), Format.RGBA8888);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, tex.getTextureObjectHandle());
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
bitmap.recycle();
// now you have the texture to do whatever you want
}
});