package com.androidtutorialpoint.androidlogin;

import android.app.ProgressDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.content.Intent;
import android.view.View;
import android.widget.Toast;
import com.android.volley.Request;
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;


public class LoginActivity extends AppCompatActivity {

    private static final String TAG = "LoginActivity";
    private static final String URL_FOR_LOGIN = "http://192.168.43.97/android_login_example/login.php";
    ProgressDialog progressDialog;
    private EditText loginInputEmail, loginInputPassword;
    private Button btnlogin;
    private Button btnLinkSignup;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        loginInputEmail = (EditText) findViewById(R.id.login_input_email);
        loginInputPassword = (EditText) findViewById(R.id.login_input_password);
        btnlogin = (Button) findViewById(R.id.btn_login);
        btnLinkSignup = (Button) findViewById(R.id.btn_link_signup);
        // Progress dialog
        progressDialog = new ProgressDialog(this);
        progressDialog.setCancelable(false);

        btnlogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                loginUser(loginInputEmail.getText().toString(),
                        loginInputPassword.getText().toString());
            }
        });

        btnLinkSignup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(), RegisterActivity.class);
                startActivity(i);
            }
        });
    }

    private void loginUser( final String email, final String password) {
        // Tag used to cancel the request
        String cancel_req_tag = "login";
        progressDialog.setMessage("Logging you in...");
        showDialog();
        StringRequest strReq = new StringRequest(Request.Method.POST,
                URL_FOR_LOGIN, 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) {
                        String user = jObj.getJSONObject("user").getString("name");
                        // Launch User activity
                        Intent intent = new Intent(
                                LoginActivity.this,
                                UserActivity.class);
                        intent.putExtra("username", user);
                        startActivity(intent);
                        finish();
                    } else {

                        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, "Login Error: " + error.getMessage());
                Toast.makeText(getApplicationContext(),
                        error.getMessage(), Toast.LENGTH_LONG).show();
                hideDialog();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting params to login url
                Map<String, String> params = new HashMap<String, String>();
                params.put("email", email);
                params.put("password", password);
                return params;
            }

        };
        // Adding request to request queue
        AppSingleton.getInstance(getApplicationContext()).addToRequestQueue(strReq,cancel_req_tag);
    }

    private void showDialog() {
        if (!progressDialog.isShowing())
            progressDialog.show();
    }
    private void hideDialog() {
        if (progressDialog.isShowing())
            progressDialog.dismiss();
    }

}

package com.androidtutorialpoint.androidlogin;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.Toast;
import com.android.volley.Request;
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;


public class RegisterActivity extends AppCompatActivity {

    private static final String TAG = "RegisterActivity";
    private static final String URL_FOR_REGISTRATION = "http://192.168.43.97/android_login_example/register.php";
    ProgressDialog progressDialog;

    private EditText signupInputName, signupInputEmail, signupInputPassword, signupInputAge;
    private Button btnSignUp;
    private Button btnLinkLogin;
    private RadioGroup genderRadioGroup;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

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

        signupInputName = (EditText) findViewById(R.id.signup_input_name);
        signupInputEmail = (EditText) findViewById(R.id.signup_input_email);
        signupInputPassword = (EditText) findViewById(R.id.signup_input_password);
        signupInputAge = (EditText) findViewById(R.id.signup_input_age);

        btnSignUp = (Button) findViewById(R.id.btn_signup);
        btnLinkLogin = (Button) findViewById(R.id.btn_link_login);

        genderRadioGroup = (RadioGroup) findViewById(R.id.gender_radio_group);
        btnSignUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                submitForm();
            }
        });
        btnLinkLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent i = new Intent(getApplicationContext(),LoginActivity.class);
                startActivity(i);
            }
        });
    }

    private void submitForm() {

        int selectedId = genderRadioGroup.getCheckedRadioButtonId();
        String gender;
        if(selectedId == R.id.female_radio_btn)
            gender = "Female";
        else
            gender = "Male";

        registerUser(signupInputName.getText().toString(),
                     signupInputEmail.getText().toString(),
                     signupInputPassword.getText().toString(),
                     gender,
                     signupInputAge.getText().toString());
    }

    private void registerUser(final String name,  final String email, final String password,
                              final String gender, final String dob) {
        // Tag used to cancel the request
        String cancel_req_tag = "register";

        progressDialog.setMessage("Adding you ...");
        showDialog();

        StringRequest strReq = new StringRequest(Request.Method.POST,
                URL_FOR_REGISTRATION, 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) {
                        String user = jObj.getJSONObject("user").getString("name");
                        Toast.makeText(getApplicationContext(), "Hi " + user +", You are successfully Added!", Toast.LENGTH_SHORT).show();

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

                        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());
                Toast.makeText(getApplicationContext(),
                        error.getMessage(), Toast.LENGTH_LONG).show();
                hideDialog();
            }
        }) {
            @Override
            protected Map<String, String> getParams() {
                // Posting params to register url
                Map<String, String> params = new HashMap<String, String>();
                params.put("name", name);
                params.put("email", email);
                params.put("password", password);
                params.put("gender", gender);
                params.put("age", dob);
                return params;
            }
        };
        // Adding request to request queue
        AppSingleton.getInstance(getApplicationContext()).addToRequestQueue(strReq, cancel_req_tag);
    }

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

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

}

package com.androidtutorialpoint.androidlogin;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;


import android.widget.TextView;
public class UserActivity extends AppCompatActivity {

    private static final String TAG = "UserActivity";

    private TextView greetingTextView;
    private Button btnLogOut;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user);
        Bundle bundle = getIntent().getExtras();
        String user = bundle.getString("username");
        greetingTextView = (TextView) findViewById(R.id.greeting_text_view);
        btnLogOut = (Button) findViewById(R.id.logout_button);
        greetingTextView.setText("Hello "+ user);
        // Progress dialog
        btnLogOut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(), LoginActivity.class);
                startActivity(i);
            }
        });
    }
}

package com.androidtutorialpoint.androidlogin;

import android.content.Context;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

public class AppSingleton {
    private static AppSingleton mAppSingletonInstance;
    private RequestQueue mRequestQueue;
    private static Context mContext;

    private AppSingleton(Context context) {
        mContext = context;
        mRequestQueue = getRequestQueue();
    }

    public static synchronized AppSingleton getInstance(Context context) {
        if (mAppSingletonInstance == null) {
            mAppSingletonInstance = new AppSingleton(context);
        }
        return mAppSingletonInstance;
    }

    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            // getApplicationContext() is key, it keeps you from leaking the
            // Activity or BroadcastReceiver if someone passes one in.
            mRequestQueue = Volley.newRequestQueue(mContext.getApplicationContext());
        }
        return mRequestQueue;
    }

    public <T> void addToRequestQueue(Request<T> req,String tag) {
        req.setTag(tag);
        getRequestQueue().add(req);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="@color/bg_login"
    android:gravity="center"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    android:fillViewport="true"
    android:paddingTop="50dp"
    android:paddingLeft="20dp"
    android:paddingRight="20dp" >
    <android.support.design.widget.TextInputLayout
        android:id="@+id/login_input_layout_email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <EditText
            android:id="@+id/login_input_email"
            android:textColor="#000000"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textEmailAddress"
            android:hint="@string/hint_email" />
    </android.support.design.widget.TextInputLayout>
    <android.support.design.widget.TextInputLayout
        android:id="@+id/login_input_layout_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <EditText
            android:id="@+id/login_input_password"
            android:textColor="#000000"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:hint="@string/hint_password" />
    </android.support.design.widget.TextInputLayout>
    <Button android:id="@+id/btn_login"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btn_login"
        android:background="@color/login_button_background"
        android:layout_marginTop="20dp"
        android:textColor="@android:color/white"/>
    <Button android:id="@+id/btn_link_signup"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btn_link_signup"
        android:background="@null"
        android:layout_marginTop="3dp"
        android:textColor="@android:color/black"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:orientation="vertical"
        android:paddingLeft="20dp"
        android:paddingRight="20dp" >
        <android.support.design.widget.TextInputLayout
            android:id="@+id/signup_input_layout_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="10dp">
            <EditText
                android:id="@+id/signup_input_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ems="10"
                android:hint="Name"/>
        </android.support.design.widget.TextInputLayout>
        <android.support.design.widget.TextInputLayout
            android:id="@+id/signup_input_layout_email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="10dp">
            <EditText
                android:id="@+id/signup_input_email"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ems="10"
                android:inputType="textEmailAddress"
                android:hint="Email" />
        </android.support.design.widget.TextInputLayout>
        <android.support.design.widget.TextInputLayout
            android:id="@+id/signup_input_layout_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="10dp">
            <EditText
                android:id="@+id/signup_input_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ems="10"
                android:inputType="textPassword"
                android:hint="@string/hint_password" />
        </android.support.design.widget.TextInputLayout>
        <android.support.design.widget.TextInputLayout
            android:id="@+id/signup_input_layout_age"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="10dp">
            <EditText
                android:id="@+id/signup_input_age"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:ems="10"
                android:hint="@string/hint_dob"/>
        </android.support.design.widget.TextInputLayout>
        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingTop="20dp">
            <TextView
                android:id="@+id/gender_textview"
                android:paddingRight="15dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/hint_gender"
                android:fontFeatureSettings="@string/hint_password"
                android:textSize="20dp"
                android:fontFamily="@string/hint_password"/>
            <RadioGroup
                android:id="@+id/gender_radio_group"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_toRightOf="@+id/gender_textview"
                android:orientation="horizontal">
                <RadioButton
                    android:id="@+id/male_radio_btn"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/male"
                    android:checked="true"
                    />
                <RadioButton
                    android:id="@+id/female_radio_btn"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text = "@string/female"
                    />
            </RadioGroup>
        </RelativeLayout>
        <Button android:id="@+id/btn_signup"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/btn_sign_up"
            android:background="@color/login_button_background"
            android:layout_marginTop="40dp"
            android:textColor="@android:color/white"/>
        <Button android:id="@+id/btn_link_login"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/btn_link_login"
            android:background="@null"
            android:layout_marginTop="3dp"
            android:textColor="@android:color/black"/>
    </LinearLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    android:fillViewport="true"
    android:orientation="vertical"
    android:gravity="center"
    android:paddingLeft="20dp"
    android:paddingRight="20dp">
            <TextView
                android:layout_marginTop="50dp"
                android:id="@+id/greeting_text_view"
                android:textColor="#000000"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="40dp"
                android:text="Hello, User"
                android:textStyle="bold"
                 />
            <Button
                android:layout_marginTop="50dp"
                android:id="@+id/logout_button"
                android:textColor="#000000"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Sign Out!!"
                android:textStyle="bold"
                />
</LinearLayout>