Email SignIn in Android App with help of FireBase

project Link - CLICKME
Email SignIn with help of FireBase

          what is firebase Auth?
Almost every app collects data of the user to give them access to use their app.there
are several reasons to collect data and creating user account one of the main reason to differentiate them and to give them access to what data they use they can save it.
so almost every have had different types of login. Some common examples of login are
login with facebook,loginwithG+, email login, signup with email, twitter login. So there are many auth providers in Android.
Firebase Auth is an Auth provider API by which you can set authentication in Android App by various Auth provides like facebook, twitter, G+, Gmail, email, GitHub.

email auth-
email auth in firebase by which you can set user login with the help of their email as
user write their email in firebase and click create an account then it sends a mail on your email to verify account and if you click on verify then account successfully verified.
Email Authentication is fully secured and all security feature provided by firebase.you can go on firebase doc  to view more about these methods in detail and you can customize it UI by your own way


            1. create 4 empty activity of name given below-

              1.MainActivity   (already made when creating a new project)

        2.LoginActivity

        3.RegisterActivity

        4.ForgetAndChangePasswordActivity  

      now their xml file also made

  * Then connect app with firebase and go to firebase console 

   and on email Signin

         2 now copy paste all xml and java code

                MainActivity.java 

	package com.example.anuj.maddeveloper;
	import android.app.ProgressDialog;
	import android.content.Intent;
	import android.os.Bundle;
	import android.support.annotation.NonNull;
	import android.support.v7.app.AppCompatActivity;
	import android.view.View;
	import android.widget.Button;
	import com.google.firebase.auth.FirebaseAuth;
	import com.google.firebase.auth.FirebaseUser;
	public class MainActivity extends AppCompatActivity {
	Button btnSignOut;
	FirebaseAuth auth;
	FirebaseUser user;
	ProgressDialog PD;
	@Override protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	auth = FirebaseAuth.getInstance();
	user = auth.getCurrentUser();
	PD = new ProgressDialog(this);
	PD.setMessage("Loading...");
	PD.setCancelable(true);
	PD.setCanceledOnTouchOutside(false);
	btnSignOut = (Button) findViewById(R.id.sign_out_button);
	btnSignOut.setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	auth.signOut();
	FirebaseAuth.AuthStateListener authListener = new FirebaseAuth.AuthStateListener() {
	@Override
	public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
	FirebaseUser user = firebaseAuth.getCurrentUser();
	if (user == null) {
	startActivity(new Intent(MainActivity.this, LoginActivity.class));
	finish();
	}
	}
	};
	}
	});
	findViewById(R.id.change_password_button).setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	startActivity(new Intent(getApplicationContext(), ForgetAndChangePasswordActivity.class).putExtra("Mode", 1));
	}
	});
	findViewById(R.id.change_email_button).setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	startActivity(new Intent(getApplicationContext(), ForgetAndChangePasswordActivity.class).putExtra("Mode", 2));
	}
	});
	findViewById(R.id.delete_user_button).setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	startActivity(new Intent(getApplicationContext(), ForgetAndChangePasswordActivity.class).putExtra("Mode", 3));
	}
	});
	}
	@Override protected void onResume() {
	if (auth.getCurrentUser() == null) {
	startActivity(new Intent(MainActivity.this, LoginActivity.class));
	finish();
	}
	super.onResume();
	}
	}

view raw MainActivity.java hosted with ❤ by GitHub

                   LoginActivity.java

	package com.example.anuj.maddeveloper;
	import android.app.ProgressDialog;
	import android.content.Intent;
	import android.os.Bundle;
	import android.support.annotation.NonNull;
	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.Toast;
	import com.google.android.gms.tasks.OnCompleteListener;
	import com.google.android.gms.tasks.Task;
	import com.google.firebase.auth.AuthResult;
	import com.google.firebase.auth.FirebaseAuth;
	public class LoginActivity extends AppCompatActivity {
	private EditText inputEmail, inputPassword;
	private FirebaseAuth auth;
	private Button btnSignUp, btnLogin;
	private ProgressDialog PD;
	@Override protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_login);
	PD = new ProgressDialog(this);
	PD.setMessage("Loading...");
	PD.setCancelable(true);
	PD.setCanceledOnTouchOutside(false);
	auth = FirebaseAuth.getInstance();
	inputEmail = (EditText) findViewById(R.id.email);
	inputPassword = (EditText) findViewById(R.id.password);
	btnSignUp = (Button) findViewById(R.id.sign_up_button);
	btnLogin = (Button) findViewById(R.id.sign_in_button);
	btnLogin.setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	final String email = inputEmail.getText().toString();
	final String password = inputPassword.getText().toString();
	try {
	if (password.length() > 0 && email.length() > 0) {
	PD.show();
	auth.signInWithEmailAndPassword(email, password)
	.addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
	@Override
	public void onComplete(@NonNull Task<AuthResult> task) {
	if (!task.isSuccessful()) {
	Toast.makeText(
	LoginActivity.this,
	"Authentication Failed",
	Toast.LENGTH_LONG).show();
	Log.v("error", task.getResult().toString());
	} else {
	Intent intent = new Intent(LoginActivity.this, MainActivity.class);
	startActivity(intent);
	finish();
	}
	PD.dismiss();
	}
	});
	} else {
	Toast.makeText(
	LoginActivity.this,
	"Fill All Fields",
	Toast.LENGTH_LONG).show();
	}
	} catch (Exception e) {
	e.printStackTrace();
	}
	}
	});
	btnSignUp.setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
	startActivity(intent);
	}
	});
	findViewById(R.id.forget_password_button).setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	startActivity(new Intent(getApplicationContext(), ForgetAndChangePasswordActivity.class).putExtra("Mode", 0));
	}
	});
	}
	@Override protected void onResume() {
	if (auth.getCurrentUser() != null) {
	startActivity(new Intent(LoginActivity.this, MainActivity.class));
	finish();
	}
	super.onResume();
	}
	}

view raw LoginActivity.java hosted with ❤ by GitHub

                            RegisterActivity.java

	package com.example.anuj.maddeveloper;
	import android.app.ProgressDialog;
	import android.content.Intent;
	import android.os.Bundle;
	import android.support.annotation.NonNull;
	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.Toast;
	import com.google.android.gms.tasks.OnCompleteListener;
	import com.google.android.gms.tasks.Task;
	import com.google.firebase.auth.AuthResult;
	import com.google.firebase.auth.FirebaseAuth;
	public class RegisterActivity extends AppCompatActivity {
	private EditText inputEmail, inputPassword;
	private FirebaseAuth auth;
	private Button btnSignUp, btnLogin;
	private ProgressDialog PD;
	@Override protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_register);
	PD = new ProgressDialog(this);
	PD.setMessage("Loading...");
	PD.setCancelable(true);
	PD.setCanceledOnTouchOutside(false);
	auth = FirebaseAuth.getInstance();
	if (auth.getCurrentUser() != null) {
	startActivity(new Intent(RegisterActivity.this, MainActivity.class));
	finish();
	}
	inputEmail = (EditText) findViewById(R.id.email);
	inputPassword = (EditText) findViewById(R.id.password);
	btnSignUp = (Button) findViewById(R.id.sign_up_button);
	btnLogin = (Button) findViewById(R.id.sign_in_button);
	btnSignUp.setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	final String email = inputEmail.getText().toString();
	final String password = inputPassword.getText().toString();
	try {
	if (password.length() > 0 && email.length() > 0) {
	PD.show();
	auth.createUserWithEmailAndPassword(email, password)
	.addOnCompleteListener(RegisterActivity.this, new OnCompleteListener<AuthResult>() {
	@Override
	public void onComplete(@NonNull Task<AuthResult> task) {
	if (!task.isSuccessful()) {
	Toast.makeText(
	RegisterActivity.this,
	"Authentication Failed",
	Toast.LENGTH_LONG).show();
	Log.v("error", task.getResult().toString());
	} else {
	Intent intent = new Intent(RegisterActivity.this, MainActivity.class);
	startActivity(intent);
	finish();
	}
	PD.dismiss();
	}
	});
	} else {
	Toast.makeText(
	RegisterActivity.this,
	"Fill All Fields",
	Toast.LENGTH_LONG).show();
	}
	} catch (Exception e) {
	e.printStackTrace();
	}
	}
	});
	btnLogin.setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	finish();
	}
	});
	}
	}

view raw RegisterActivity.java hosted with ❤ by GitHub

          forgetandchangepasswordactivity.java

	package com.example.anuj.maddeveloper;
	import android.app.ProgressDialog;
	import android.os.Bundle;
	import android.support.annotation.NonNull;
	import android.support.design.widget.TextInputLayout;
	import android.support.v7.app.AppCompatActivity;
	import android.text.TextUtils;
	import android.view.View;
	import android.widget.Button;
	import android.widget.EditText;
	import android.widget.TextView;
	import android.widget.Toast;
	import com.google.android.gms.tasks.OnCompleteListener;
	import com.google.android.gms.tasks.Task;
	import com.google.firebase.auth.FirebaseAuth;
	import com.google.firebase.auth.FirebaseUser;
	public class ForgetAndChangePasswordActivity extends AppCompatActivity {
	private EditText edtMode;
	private TextView txtMode;
	private Button submit;
	private FirebaseAuth auth;
	private ProgressDialog PD;
	private TextInputLayout labelMode;
	@Override protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_forget_and_change_password);
	PD = new ProgressDialog(this);
	PD.setMessage("Loading...");
	PD.setCancelable(true);
	PD.setCanceledOnTouchOutside(false);
	auth = FirebaseAuth.getInstance();
	edtMode = (EditText) findViewById(R.id.mode);
	txtMode = (TextView) findViewById(R.id.title);
	submit = (Button) findViewById(R.id.submit_button);
	labelMode = (TextInputLayout) findViewById(R.id.label);
	final int mode = getIntent().getIntExtra("Mode", 0);
	if (mode == 0) {
	txtMode.setText("Forget Password");
	edtMode.setHint("Enter Registered Email");
	labelMode.setHint("Enter Registered Email");
	} else if (mode == 1) {
	txtMode.setText("Change Password");
	edtMode.setHint("Enter New Password");
	labelMode.setHint("Enter New Password");
	} else if (mode == 2) {
	txtMode.setText("Change Email");
	edtMode.setHint("Enter New Email");
	labelMode.setHint("Enter New Email");
	} else {
	txtMode.setText("Delete User");
	edtMode.setVisibility(View.GONE);
	}
	submit.setOnClickListener(new View.OnClickListener() {
	@Override public void onClick(View view) {
	callFunction(mode);
	}
	});
	}
	private void callFunction(int mode) {
	FirebaseUser user = auth.getCurrentUser();
	final String modeStr = edtMode.getText().toString();
	if (mode == 0) {
	if (TextUtils.isEmpty(modeStr)) {
	edtMode.setError("Value Required");
	} else {
	PD.show();
	auth.sendPasswordResetEmail(modeStr).addOnCompleteListener(new OnCompleteListener<Void>() {
	@Override public void onComplete(@NonNull Task<Void> task) {
	if (task.isSuccessful()) {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "We have sent you instructions to reset your password!", Toast.LENGTH_SHORT).show();
	} else {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to send reset email!", Toast.LENGTH_SHORT).show();
	}
	PD.dismiss();
	}
	});
	}
	} else if (mode == 1) {
	if (TextUtils.isEmpty(modeStr)) {
	edtMode.setError("Value Required");
	} else {
	PD.show();
	user.updatePassword(modeStr)
	.addOnCompleteListener(new OnCompleteListener<Void>() {
	@Override public void onComplete(@NonNull Task<Void> task) {
	if (task.isSuccessful()) {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "Password is updated!", Toast.LENGTH_SHORT).show();
	} else {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to update password!", Toast.LENGTH_SHORT).show();
	}
	PD.dismiss();
	}
	});
	}
	} else if (mode == 2) {
	if (TextUtils.isEmpty(modeStr)) {
	edtMode.setError("Value Required");
	} else {
	PD.show();
	user.updateEmail(modeStr)
	.addOnCompleteListener(new OnCompleteListener<Void>() {
	@Override public void onComplete(@NonNull Task<Void> task) {
	if (task.isSuccessful()) {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "Email address is updated.", Toast.LENGTH_LONG).show();
	} else {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to update email!", Toast.LENGTH_LONG).show();
	}
	PD.dismiss();
	}
	});
	}
	} else {
	if (user != null) {
	PD.show();
	user.delete()
	.addOnCompleteListener(new OnCompleteListener<Void>() {
	@Override public void onComplete(@NonNull Task<Void> task) {
	if (task.isSuccessful()) {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "Your profile is deleted:( Create a account now!", Toast.LENGTH_SHORT).show();
	} else {
	Toast.makeText(ForgetAndChangePasswordActivity.this, "Failed to delete your account!", Toast.LENGTH_SHORT).show();
	}
	PD.dismiss();
	}
	});
	}
	}
	}
	}

view raw ForgetAndChangePasswordActivity.java hosted with ❤ by GitHub

                activity_forget_and_change_password.xml

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:background="@color/white"
	android:gravity="center"
	android:orientation="vertical"
	android:padding="16dp"
	tools:context="com.example.anuj.maddeveloper.ForgetAndChangePasswordActivity">
	<TextView
	android:id="@+id/title"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="FireBase Change Password"
	android:gravity="center"
	android:textAllCaps="true"
	android:textSize="16sp"
	android:padding="10dp"/>
	<android.support.design.widget.TextInputLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:id="@+id/label">
	<EditText
	android:id="@+id/mode"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Mode"
	android:inputType="textEmailAddress"
	android:maxLines="1"
	android:singleLine="true"
	android:textColor="@color/colorPrimary" />
	</android.support.design.widget.TextInputLayout>
	<Button
	android:id="@+id/submit_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Submit"
	android:textColor="@color/white" />
	</LinearLayout>
	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:background="@color/white"
	android:gravity="center"
	android:orientation="vertical"
	android:padding="16dp"
	tools:context="com.example.anuj.maddeveloper.ForgetAndChangePasswordActivity">
	<TextView
	android:id="@+id/title"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="FireBase Change Password"
	android:gravity="center"
	android:textAllCaps="true"
	android:textSize="16sp"
	android:padding="10dp"/>
	<android.support.design.widget.TextInputLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:id="@+id/label">
	<EditText
	android:id="@+id/mode"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Mode"
	android:inputType="textEmailAddress"
	android:maxLines="1"
	android:singleLine="true"
	android:textColor="@color/colorPrimary" />
	</android.support.design.widget.TextInputLayout>
	<Button
	android:id="@+id/submit_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Submit"
	android:textColor="@color/white" />
	</LinearLayout>

view raw activity_forget_and_change_password.xml hosted with ❤ by GitHub

             activity_login.xml

	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:background="@color/white"
	android:gravity="center"
	android:orientation="vertical"
	android:padding="16dp">
	<TextView
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="FireBase Auth Login"
	android:gravity="center"
	android:textAllCaps="true"
	android:textSize="16sp"
	android:padding="10dp"/>
	<android.support.design.widget.TextInputLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
	<EditText
	android:id="@+id/email"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Email"
	android:inputType="textEmailAddress"
	android:maxLines="1"
	android:singleLine="true"
	android:textColor="@color/colorPrimary" />
	</android.support.design.widget.TextInputLayout>
	<android.support.design.widget.TextInputLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
	<EditText
	android:id="@+id/password"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:focusableInTouchMode="true"
	android:hint="Password"
	android:imeActionId="@+id/login"
	android:imeOptions="actionUnspecified"
	android:inputType="textPassword"
	android:maxLines="1"
	android:singleLine="true"
	android:textColor="@color/colorPrimary" />
	</android.support.design.widget.TextInputLayout>
	<Button
	android:id="@+id/sign_in_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Sign In"
	android:textColor="@color/white" />
	<!-- Link to Login Screen -->
	<Button
	android:id="@+id/sign_up_button"
	style="?android:textAppearanceSmall"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="16dp"
	android:background="@color/colorPrimary"
	android:text="Sign Up"
	android:textColor="@color/white"
	android:textStyle="bold" />
	<!-- Link to Forget Password -->
	<TextView
	android:id="@+id/forget_password_button"
	style="?android:textAppearanceSmall"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="16dp"
	android:gravity="center"
	android:padding="10dp"
	android:text="Forget Password"
	android:textColor="@color/colorPrimary"
	android:textStyle="bold" />
	</LinearLayout>

view raw activity_login.xml hosted with ❤ by GitHub

                           activity_main.xml

	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:background="@color/white"
	android:gravity="center"
	android:orientation="vertical"
	android:padding="16dp">
	<TextView
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="Welcome to Firebase Auth Tutorial"
	android:gravity="center"
	android:textAllCaps="true"
	android:textSize="16sp"
	android:padding="10dp"/>
	<Button
	android:id="@+id/change_password_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Change Password"
	android:textColor="@color/white" />
	<Button
	android:id="@+id/change_email_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Change Email"
	android:textColor="@color/white" />
	<Button
	android:id="@+id/delete_user_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Delete User"
	android:textColor="@color/white" />
	<Button
	android:id="@+id/sign_out_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Sign Out"
	android:textColor="@color/white" />
	</LinearLayout>

view raw activity_main.xml hosted with ❤ by GitHub

            activity_register.xmls

	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="fill_parent"
	android:layout_height="fill_parent"
	android:background="@color/white"
	android:gravity="center"
	android:orientation="vertical"
	android:padding="16dp">
	<TextView
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="FireBase Auth Register"
	android:gravity="center"
	android:textAllCaps="true"
	android:textSize="16sp"
	android:padding="10dp"/>
	<android.support.design.widget.TextInputLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
	<EditText
	android:id="@+id/email"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:hint="Email"
	android:inputType="textEmailAddress"
	android:maxLines="1"
	android:singleLine="true"
	android:textColor="@color/colorPrimary" />
	</android.support.design.widget.TextInputLayout>
	<android.support.design.widget.TextInputLayout
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
	<EditText
	android:id="@+id/password"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:focusableInTouchMode="true"
	android:hint="Password"
	android:imeActionId="@+id/login"
	android:imeOptions="actionUnspecified"
	android:inputType="textPassword"
	android:maxLines="1"
	android:singleLine="true"
	android:textColor="@color/colorPrimary" />
	</android.support.design.widget.TextInputLayout>
	<Button
	android:id="@+id/sign_up_button"
	style="?android:textAppearanceSmall"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="16dp"
	android:background="@color/colorPrimary"
	android:text="Sign Up"
	android:textColor="@color/white"
	android:textStyle="bold" />
	<!-- Link to Login Screen -->
	<Button
	android:id="@+id/sign_in_button"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:layout_marginTop="20dip"
	android:background="@color/colorPrimary"
	android:text="Sign In"
	android:textColor="@color/white" />
	</LinearLayout>

view raw activity_register.xml hosted with ❤ by GitHub

         AT LAST

   add values>colour.xml

    <color name="white">#ffffff</color>

and

build.grade(module app)

in dependency add-

       compile 'com.android.support:design:24.0.0'