How to select image from gallery and crop?

Question

I want to select image from gallery and crop

please help me to write correct code

This my Code

 public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId()==R.id.menu_attachment)
        {
            Intent galleryIntent=new Intent(Intent.ACTION_GET_CONTENT);
            galleryIntent.setType("image/*");
            startActivityForResult(galleryIntent,GALLERY_REQUEST_CODE);



        }

And this my onActivityResult

@Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==GALLERY_REQUEST_CODE && resultCode==RESULT_OK)
        {
            imageUri=data.getData();
            postImage.setImageURI(imageUri);


        }
    }