Halo selamat siang pada kesempatan kali ini kita akan membuat halaman Login di Android dengan Firebase, untuk membuat login dengan Firebase sangat mudah kita tinggal memanfaatkan fungsi authentikasi dari firebase, fungsi authentikasi firebase ini sangat lengkap kita bisa login lewat facebook, google akun, twitter, email, no handphone dll, namun yang akan kita bahas pada tutorial kali ini yaitu login lewat Email dan Password.

Untuk membuat Login dengan Email/Password di Firebase Langkah pertama kita aktifkan dulu signin method nya di Firebase Console, caranya yaitu anda Login dulu ke Firebase kemudian pilih projek anda yang akan menggunakan authentikasi kemudian pada tab develop di samping kiri pilih authentication -> sign-in method -> pilih provider yang akan digunakan untuk melakukan authentikasi disini saya menggunakan provider Email/Password -> pada status pilih enable.

kemudian pada tab users tambahkan user yang akan digunakan untuk login nantinya karena pada tutorial kali ini kita tidak akan membuat register jadi usernya dimasukan secara manual dari firebase

selanjutnya buat activity baru dan tambhkan dua buah editTeks untuk email dan password kemudian tambhkan sebuah button untuk submit, atur tampilanya agar terlihat lebih cantik seperti ini:

xml version="1.0" encoding="utf-8"?>

xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:padding="10dp"

    android:background="@color/colorPrimary"

    tools:context="giviews.id.fireapp.LoginActivity">



    
        android:id="@+id/logoImage"

        android:layout_width="100dp"

        android:layout_height="130dp"

        android:layout_marginTop="20dp"

        android:layout_centerHorizontal="true"

        android:src="@drawable/logo"

        android:textAlignment="center" />



    
        android:id="@+id/txtLogo"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Firebase Login"

        android:gravity="center"

        android:textColor="#ffffff"

        android:layout_below="@+id/logoImage"

        android:textSize="25sp"/>



    
        android:id="@+id/email"

        android:background="@drawable/input_background"

        android:padding="15dp"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="Email ..."

        android:textColor="#807f7f"

        android:layout_below="@+id/txtLogo"

        android:layout_marginTop="60dp"

        android:inputType="textEmailAddress" />



    
        android:id="@+id/password"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="Password ..."

        android:background="@drawable/input_background"

        android:padding="15dp"

        android:textColor="#807f7f"

        android:layout_marginTop="20dp"

        android:layout_below="@+id/email"

        android:inputType="textPassword" />



        android:id="@+id/loginBtn"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_below="@+id/password"

        android:background="@drawable/btn_background"

        android:padding="15dp"

        android:textColor="@color/colorPrimary"

        android:layout_marginTop="20dp"

        android:textSize="20dp"

        android:text="Sign In"/>

xml version="1.0" encoding="utf-8"?>

xmlns:android="http://schemas.android.com/apk/res/android">

    android:color="#fff" />

    android:radius="5dp" />

xml version="1.0" encoding="utf-8"?>

xmlns:android="http://schemas.android.com/apk/res/android">

    android:color="@color/colorAccent" />

    android:radius="5dp" />

package giviews.id.fireapp;



import android.content.Intent;

import android.support.annotation.NonNull;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.view.WindowManager;

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 mEmailField;

    private EditText mPasswordField;

    private Button mloginBtn;



    private FirebaseAuth mAuth;

    private FirebaseAuth.AuthStateListener mAuthListener;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_login);



        //Membuat FullScreen

        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);



        mEmailField = (EditText) findViewById(R.id.email);

        mPasswordField = (EditText) findViewById(R.id.password);

        mloginBtn = (Button) findViewById(R.id.loginBtn);



        mAuth = FirebaseAuth.getInstance();



        mAuthListener = new FirebaseAuth.AuthStateListener() {

            @Override

            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {

                if (firebaseAuth.getCurrentUser() != null) {

                    startActivity(new Intent(LoginActivity.this, MainActivity.class) );

                }

            }

        };



        mloginBtn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                startSignIn();

            }

        });

    }



    @Override

    protected void onStart() {

        super.onStart();



        mAuth.addAuthStateListener(mAuthListener);

    }



    private void startSignIn() {

        String email = mEmailField.getText().toString();

        String password = mPasswordField.getText().toString();



        if (TextUtils.isEmpty(email) | TextUtils.isEmpty(password)) {

            Toast.makeText(LoginActivity.this, "Fields are Empty", Toast.LENGTH_SHORT).show();

        } else {



            mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener() {

                @Override

                public void onComplete(@NonNull Task task) {



                    if (!task.isSuccessful()) {

                        Toast.makeText(LoginActivity.this, "Login Problem", Toast.LENGTH_SHORT).show();

                    }



                }

            });

        }

    }

}

package giviews.id.splash;



import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;



/**

 * Created by asus on 02/04/2017.

 */



public class DatabaseHelper extends SQLiteOpenHelper{

    //nama database

    public static final String DATABASE_NAME = "Student.db";

    //nama table

    public static final String TABLE_NAME = "student_table";

    //versi database

    private static final int DATABASE_VERSION = 1;

    //table field

    public static final String COL_1 = "ID";

    public static final String COL_2 = "NAME";

    public static final String COL_3 = "SURNAME";

    public static final String COL_4 = "MARKS";



    public DatabaseHelper(Context context) {

        super(context, DATABASE_NAME, null, DATABASE_VERSION);

        SQLiteDatabase db = this.getWritableDatabase();

    }



    @Override

    public void onCreate(SQLiteDatabase db) {

        db.execSQL("create table student_table(id integer primary key autoincrement," +

                "name text null," +

                "surname text null," +

                "marks integer null);");

    }



    @Override

    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        db.execSQL("DROP TABLE IF EXISTS "+ TABLE_NAME);

        onCreate(db);

    }



    //metode untuk tambah data

    public boolean insertData(String name, String surname, String marks) {

        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues contentValues = new ContentValues();

        contentValues.put(COL_2,name);

        contentValues.put(COL_3,surname);

        contentValues.put(COL_4,marks);

        long result = db.insert(TABLE_NAME, null, contentValues);

        if(result == -1)

            return false;

        else

            return true;

    }



    //metode untuk mengambil data

    public Cursor getAllData() {

        SQLiteDatabase db = this.getWritableDatabase();

        Cursor res = db.rawQuery("select * from student_table", null);

        return res;

    }



    //metode untuk merubah data

    public boolean updateData(String id,String name,String surname,String marks) {

        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues contentValues = new ContentValues();

        contentValues.put(COL_1,id);

        contentValues.put(COL_2,name);

        contentValues.put(COL_3,surname);

        contentValues.put(COL_4,marks);

        db.update(TABLE_NAME,contentValues,"ID = ?",new String[] {id});

        return true;

    }



    //metode untuk menghapus data

    public int deleteData (String id) {

        SQLiteDatabase db = this.getWritableDatabase();

        return db.delete(TABLE_NAME, "ID = ?", new String[] {id});

    }

}

package giviews.id.splash;



import android.database.Cursor;

import android.os.Bundle;

import android.support.v7.app.AlertDialog;

import android.support.v7.app.AppCompatActivity;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;



public class MainActivity extends AppCompatActivity {

    DatabaseHelper myDb;

    EditText editName,editSurname,editMarks,editTextId;

    Button btnAddData;

    Button btnViewAll;

    Button btnUpdate;

    Button btnDelete;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        myDb = new DatabaseHelper(this);

        editName = (EditText)findViewById(R.id.editText_name);

        editSurname = (EditText)findViewById(R.id.editText_surname);

        editMarks = (EditText)findViewById(R.id.editText_marks);

        editTextId = (EditText)findViewById(R.id.editTextId);

        btnAddData = (Button)findViewById(R.id.button_add);

        btnViewAll = (Button)findViewById(R.id.button_view);

        btnUpdate = (Button)findViewById(R.id.button_update);

        btnDelete = (Button)findViewById(R.id.button_delete);

        AddData();

        viewAll();

        UpdateData();

        deleteData();

    }



    //fungsi hapus

    public void deleteData() {

        btnDelete.setOnClickListener(

                new View.OnClickListener() {

                    @Override

                    public void onClick(View v) {

                        Integer deletedRows = myDb.deleteData(editTextId.getText().toString());

                        if (deletedRows > 0)

                            Toast.makeText(MainActivity.this,"Data Deleted",Toast.LENGTH_LONG).show();

                        else

                            Toast.makeText(MainActivity.this,"Data Failed to Deleted!",Toast.LENGTH_LONG).show();

                    }

                }

        );

    }



    //fungsi update

    public void UpdateData() {

        btnUpdate.setOnClickListener(

                new View.OnClickListener() {

                    @Override

                    public void onClick(View v) {

                        boolean isUpdate = myDb.updateData(editTextId.getText().toString(),

                                editName.getText().toString(),

                                editSurname.getText().toString(),

                                editMarks.getText().toString());

                        if(isUpdate == true)

                            Toast.makeText(MainActivity.this,"Data Updated",Toast.LENGTH_LONG).show();

                        else

                            Toast.makeText(MainActivity.this,"Data Failed to Update",Toast.LENGTH_LONG).show();

                    }

                }

        );

    }



    //fungsi tambah

    public void AddData() {

        btnAddData.setOnClickListener(

                new View.OnClickListener() {

                    @Override

                    public void onClick(View v) {

                        boolean isInserted = myDb.insertData(editName.getText().toString(),

                                editSurname.getText().toString(),

                                editMarks.getText().toString() );

                        if(isInserted == true)

                            Toast.makeText(MainActivity.this,"Data Iserted",Toast.LENGTH_LONG).show();

                        else

                            Toast.makeText(MainActivity.this,"Data Not Iserted",Toast.LENGTH_LONG).show();

                    }

                }

        );

    }



    //fungsi menampilkan data

    public void viewAll() {

        btnViewAll.setOnClickListener(

            new View.OnClickListener(){

                 @Override

                     public void onClick(View v) {

                     Cursor res = myDb.getAllData();

                     if(res.getCount() == 0) {

                     // show message

                         showMessage("Error","Noting Found");

                     return;

                 }



                 StringBuffer buffer = new StringBuffer();

                     while (res.moveToNext() ) {

                         buffer.append("Id :"+ res.getString(0)+"\n");

                         buffer.append("Name :"+ res.getString(1)+"\n");

                         buffer.append("Surname :"+ res.getString(2)+"\n");

                         buffer.append("Marks :"+ res.getString(3)+"\n\n");

                     }



                     // show all data

                     showMessage("Data",buffer.toString());

                }

            }

        );

    }



    //membuat alert dialog

    public void showMessage(String title, String Message){

        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        builder.setCancelable(true);

        builder.setTitle(title);

        builder.setMessage(Message);

        builder.show();

    }

}