Android Login Validation

For Login Validation 

email = edit_useremail.getText().toString();
pass = edit_password.getText().toString();
if (email.equals("")) {
    edit_useremail.setError("Please enter Email!");
    edit_useremail.requestFocus();
} else if (!android.util.Patterns.EMAIL_ADDRESS.matcher(edit_useremail.getText().toString()).matches()) {
    edit_useremail.setError("Please enter valid Email");
    edit_useremail.requestFocus();
    return;
} else if (pass.equals("")) {
    txtForgetPass.setError("Please enter Password!");
    txtForgetPass.requestFocus();
}

/* else if (!checkBoxRememberMe.isChecked()) {    checkBoxRememberMe.setError("Please select Box!");} */

 else {

 final ProgressDialog pd = new ProgressDialog(LoginActivity.this);
    pd.setMessage("Loading...");
    pd.show();

    JSONObject jsonObject = new JSONObject();
    try {
        jsonObject.put("email", email);
        jsonObject.put("password", pass);
    } catch (JSONException e) {
        e.printStackTrace();
    }
    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.POST,
            USERLOGIN, jsonObject, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            try {
                String status = response.getString("status");
                String message = response.getString("message");

                if (status.equals("true")) {
                    manager.setPreferences(LoginActivity.this, "statuslogin", "1");
                    String statuslogin = manager.getPreferences(LoginActivity.this, "status");
                    
              Intent intent = new Intent(getApplicationContext(), MainActivity.class);
              intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
              startActivity(intent);
               finish();

                } else {
                    Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
                }

                Toast.makeText(LoginActivity.this, message, Toast.LENGTH_LONG).show();

                JSONObject data = response.getJSONObject("data");
                SharedPreferences.Editor editor = preferences.edit();
                editor.putString("auth_token", data.getString("auth_token"));
                editor.putString("username", data.getString("username"));
                editor.commit();


            } catch (JSONException e) {
                e.printStackTrace();
            }
            pd.dismiss();
        }
    }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getApplicationContext(),
                    error.getMessage(), Toast.LENGTH_LONG).show();
            pd.dismiss();
        }
    })

    {
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String, String> params = new HashMap<String, String>();
            params.put("Csrf-Token", "default11");
            return params;
        }
    };


    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(jsonObjReq);
}