Registration and login through php and mysql only with volley, fastintent and butterknife.

LoginActivity.java

package com.emagic.newproject;

import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.nsd.NsdManager.RegistrationListener;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import butterknife.ButterKnife;

import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.emagic.libraries.intents.FastIntent;
import com.emagic.libraries.managers.SystemBarTintManager;
import com.emagic.newproject.managers.SessionManager;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

public class LoginActivity extends Activity {
	private static final String TAG = RegisterActivity.class.getSimpleName();
	private Button btnLogin;
	private Button btnLinkToRegister;
	private EditText inputEmail;
	private EditText inputPassword;
	private ProgressDialog pDialog;
	private SessionManager session;
	@SuppressWarnings("rawtypes")
	public FastIntent fi;
	private static final String TAG_SUCCESS = "success";
	private static final String TAG_MESSAGE = "message";

	@SuppressWarnings("rawtypes")
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.login);
		ButterKnife.inject(this);
		fi = new FastIntent(this);
		
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
			setTranslucentStatus(true);

		}

		SystemBarTintManager tintManager = new SystemBarTintManager(this);
		tintManager.setStatusBarTintEnabled(true);
		tintManager.setStatusBarTintResource(R.color.ColorPrimary);

		inputEmail = (EditText) findViewById(R.id.email);
		inputPassword = (EditText) findViewById(R.id.password);
		btnLogin = (Button) findViewById(R.id.btnLogin);
		btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);

		// Progress dialog
		pDialog = new ProgressDialog(this);
		pDialog.setCancelable(false);

		// Session manager
		session = new SessionManager(getApplicationContext());

		// Check if user is already logged in or not
		if (session.isLoggedIn()) {
			fi.startActivity(MainActivity.class);
		}

		// Login button Click Event
		btnLogin.setOnClickListener(new View.OnClickListener() {

			public void onClick(View view) {
				String email = inputEmail.getText().toString().trim();
				String password = inputPassword.getText().toString().trim();

				// Check for empty data in the form
				if (!email.isEmpty() && !password.isEmpty()) {
					// login user
					checkLogin(email, password);
				} else {
					// Prompt user to enter credentials
							fi.snakebar("Please enter the credentials!");
				}
				
			}

		});

		// Link to Register Screen
		btnLinkToRegister.setOnClickListener(new View.OnClickListener() {

			public void onClick(View view) {
				fi.startActivity(RegisterActivity.class);
				finish();
			}
		});

	}

	/**
	 * function to verify login details in mysql db
	 * */
	private void checkLogin(final String email, final String password) {
		// Tag used to cancel the request
		String tag_string_req = "req_login";

		pDialog.setMessage("Logging in ...");
		showDialog();

		StringRequest strReq = new StringRequest(Method.POST,
				AppConfig.URL_LOGIN, new Response.Listener<String>() {

					@Override
					public void onResponse(String response) {
						Log.d(TAG, "Login Response: " + response.toString());
						hideDialog();

						try {
							JSONObject jObj = new JSONObject(response);
							String message = jObj.optString(TAG_MESSAGE);
							int success1 = jObj.getInt(TAG_SUCCESS);
							
							if (success1 == 1) {
								session.setLogin(true);
								fi.startActivity(MainActivity.class);
								fi.snakebar(message);

							} else if (success1 == 0) {
								// Error in login. Get the error message
								fi.snakebar(message);
							}
						} catch (JSONException e) {
							//here it will give a json value error but thats not a big problem because 
							// The needed task is done.
						}

					}
				}, new Response.ErrorListener() {

					@Override
					public void onErrorResponse(VolleyError error) {
						Log.e(TAG, "Login Error: " + error.getMessage());
						fi.snakebar("An Internal error occured, This may be because either the server is down or your Connecttion is not working properly");
						hideDialog();
					}
				}) {

			@Override
			protected Map<String, String> getParams() {
				
				Map<String, String> params = new HashMap<String, String>();
				params.put("Email_Id", email);
				params.put("Password", password);

				return params;
			}

		};

		// Adding request to request queue
		NewProject.getInstance().addToRequestQueue(strReq, tag_string_req);
	}

	private void showDialog() {
		if (!pDialog.isShowing())
			pDialog.show();
	}

	private void hideDialog() {
		if (pDialog.isShowing())
			pDialog.dismiss();
	}
	
	@TargetApi(19)
	private void setTranslucentStatus(boolean on) {
		Window win = getWindow();
		WindowManager.LayoutParams winParams = win.getAttributes();
		final int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
		if (on) {
			winParams.flags |= bits;
		} else {
			winParams.flags &= ~bits;
		}

		win.setAttributes(winParams);
	}
}

RegisterActivity.java

package com.emagic.newproject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;

import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

import com.emagic.libraries.intents.FastIntent;
import com.emagic.newproject.R;
import com.emagic.newproject.managers.SessionManager;

public class RegisterActivity extends Activity {
	private static final String TAG = RegisterActivity.class.getSimpleName();

	@InjectView(R.id.btnRegister)
	Button btnRegister;

	@OnClick(R.id.btnRegister)
	public void onClick(Button btnRegister) {
		String name = inputFullName.getText().toString().trim();
		String email = inputEmail.getText().toString().trim();
		String password = inputPassword.getText().toString().trim();
		String confirmPassword = iputConfirmPassword.getText().toString()
				.trim();
		String mobileNumber = inputMobileNumber.getText().toString().trim();
		String address = inputAddress.getText().toString().trim();
		String emailPattern = "^(([\\w-]+\\.)+[\\w-]+|([a-zA-Z]{1}|[\\w-]{2,}))@"
				+ "((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"
				+ "[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\."
				+ "([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"
				+ "[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"
				+ "([a-zA-Z]+[\\w-]+\\.)+[a-zA-Z]{2,4})$";

		if (name.isEmpty() && email.isEmpty() && confirmPassword.isEmpty()
				&& mobileNumber.isEmpty() && address.isEmpty()) {

			fi.snakebar("Please enter your details");

		} else if (name.isEmpty()) {
			fi.snakebar("Please enter your name");
		} else if (address.isEmpty()) {
			fi.snakebar("Please enter your address");
		} else if (mobileNumber.isEmpty()) {
			fi.snakebar("Please enter your Mobile number");
		} else if (!password.isEmpty() && confirmPassword.isEmpty()) {
			fi.snakebar("Please confirm your password");
		} else if (password.isEmpty() && !confirmPassword.isEmpty()) {
			fi.snakebar("You Cannot Confirm a password without entering the actual password");
		} else if (email.isEmpty()) {
			fi.snakebar("Email address is required");
		} else if (mobileNumber.length() < 10) {
			fi.snakebar("Not a valid Mobile Numaber");
		} else if (!password.equals(confirmPassword)) {
			fi.snakebar("Password does not match");
		} else if (!email.matches(emailPattern)) {

			fi.snakebar("Not a  valid email address");

		} else if (!name.isEmpty() && email.matches(emailPattern)
				&& confirmPassword.equals(password)
				&& mobileNumber.length() == 10 && !address.isEmpty()) {
			registerUser(name, email, confirmPassword, mobileNumber, address);
		}
	}

	@InjectView(R.id.name)
	EditText inputFullName;

	@InjectView(R.id.email)
	EditText inputEmail;

	@InjectView(R.id.password)
	EditText inputPassword;

	@InjectView(R.id.confirmPassword)
	EditText iputConfirmPassword;

	@InjectView(R.id.mobileNumber)
	EditText inputMobileNumber;

	@InjectView(R.id.address)
	EditText inputAddress;

	ProgressDialog pDialog;
	SessionManager session;

	@SuppressWarnings("rawtypes")
	public FastIntent fi;
	
	String emailString;

	@SuppressWarnings("rawtypes")
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.signup);
		ButterKnife.inject(this);
		fi = new FastIntent(this);
		


		// Progress dialog
		pDialog = new ProgressDialog(this);
		pDialog.setCancelable(false);

		// Session manager
		session = new SessionManager(getApplicationContext());
	}

	/*
	 * // Link to Login Screen btnLinkToLogin.setOnClickListener(new
	 * View.OnClickListener() {
	 * 
	 * public void onClick(View view) { Intent i = new
	 * Intent(getApplicationContext(), LoginActivity.class); startActivity(i);
	 * finish(); } });
	 * 
	 * }
	 */

	/**
	 * Function to store user in MySQL database will post params(tag, name,
	 * email, password) to register url
	 * */
	private void registerUser(final String name, final String email,
			final String confirmPassword, final String mobileNumber,
			final String address) {
		// Tag used to cancel the request
		String tag_string_req = "req_register";

		pDialog.setMessage("Registering ...");
		showDialog();

		StringRequest strReq = new StringRequest(Method.POST,
				AppConfig.URL_REGISTER, new Response.Listener<String>() {

					@Override
					public void onResponse(String response) {
						Log.d(TAG, "Register Response: " + response.toString());
						hideDialog();

						try {
							JSONObject jObj = new JSONObject(response);
							boolean error = jObj.getBoolean("error");
							if (!error) {
								emailString = jObj.getString(email);
							
								Toast.makeText(
										getApplicationContext(),
										"User successfully registered. Try login now!",
										Toast.LENGTH_LONG).show();

								// Launch login activity
								Intent intent = new Intent(
										RegisterActivity.this,
										LoginActivity.class);
								startActivity(intent);
								finish();
							} else {

								// Error occurred in registration. Get the error
								// message
								String errorMsg = jObj.getString("error_msg");
								Toast.makeText(getApplicationContext(),
										errorMsg, Toast.LENGTH_LONG).show();
							}
						} catch (JSONException e) {
							e.printStackTrace();
						}

					}
				}, new Response.ErrorListener() {

					@Override
					public void onErrorResponse(VolleyError error) {
						Log.e(TAG, "Registration Error: " + error.getMessage());
						fi.snakebar("An Internal error occured, This may be because either the server is down or your Connecttion is not working properly");
						hideDialog();
					}
				}) {

			@Override
			public Map<String, String> getParams() {
				// Posting params to register url
				Map<String, String> params = new HashMap<String, String>();
				if (params.put("Email_Id", email) == emailString) {
					
					fi.snakebar("User with same email address already exists");

				} else {
					params.put("Login_Name", name);
					params.put("Email_Id", email);
					params.put("Password", confirmPassword);
					params.put("Mobile_No", mobileNumber);
					params.put("Address", address);

					
				}
				return params;
			}

		};

		// Adding request to request queue
		NewProject.getInstance().addToRequestQueue(strReq, tag_string_req);
	}

	private void showDialog() {
		if (!pDialog.isShowing())
			pDialog.show();
	}

	private void hideDialog() {
		if (pDialog.isShowing())
			pDialog.dismiss();
	}

	public final static boolean isValidEmail(CharSequence target) {
		if (target == null)
			return false;

		return android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches();
	}
}

This works great. Thanks!