SingActivity.java

package id.my.asmith.myapplication;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
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;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class SingActivity extends AppCompatActivity {
    //Declaration
    private EditText mTxtEmail, mTxtPass;
    private Button mBtnGO, mBtnForgot, mBtnAnon;
    private ProgressDialog mProgressDialog;
    private FirebaseAuth mAuth;
    private DatabaseReference mDatabase;
    private FirebaseAuth.AuthStateListener mAuthStateListener;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sing);

        //Initialization
        //Views
        mProgressDialog = new ProgressDialog(this);
        mAuth = FirebaseAuth.getInstance();
        mDatabase = FirebaseDatabase.getInstance().getReference();
        mTxtEmail = (EditText)findViewById(R.id.edEmail);
        mTxtPass = (EditText)findViewById(R.id.edPwd);
        mBtnGO = (Button)findViewById(R.id.btnGo);

        //Cek the user status
        mAuthStateListener = new FirebaseAuth.AuthStateListener() {



            //Versi lain dari Aunt Instance
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();

                if (user != null) {
                    // user has signed
                    Log.d("Sing", "onAuthStateChanged:signed_in:" + user.getUid());
                    startActivity(new Intent(SingActivity.this, MainActivity.class));
                    finish();
                } else {
                    // user has logout
                    Log.d("Sing", "onAuthStateChanged:signed_out");
                }
            }
        };

        mBtnForgot = (Button) findViewById(R.id.btnForgot);
        mBtnForgot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Showing AlertDialog after clicking Button forgot
                final AlertDialog.Builder alertDialogBuilder =
                        new AlertDialog.Builder(SingActivity.this);
                alertDialogBuilder.setTitle("Enter your registered email address!");
                alertDialogBuilder.setIcon(R.mipmap.ic_launcher);
                //Showing EditText in alertDialog
                final EditText inPwd = new EditText(SingActivity.this);
                alertDialogBuilder.setView(inPwd, 60, 60, 60, 0);
                inPwd.setImeOptions(EditorInfo.IME_ACTION_DONE);
                inPwd.setSingleLine(true);
                // set positive button: Send
                alertDialogBuilder.setPositiveButton("Send",new DialogInterface.OnClickListener() {
                    public void onClick(final DialogInterface dialog, int id) {
                        // go to a new activity of the app
                        // onClickEvent to reset the password
                        // Get string type data from inPwd
                        String email = inPwd.getText().toString().trim();
                        if (TextUtils.isEmpty(email)) {
                            Toast.makeText(getApplication(),
                                    "Enter your registered email address",
                                    Toast.LENGTH_SHORT).show();
                            return;
                        }
                        // Displaying Progress Dialog
                        mProgressDialog.show();
                        mProgressDialog.setMessage("Sending request!");
                        // Sending data to your registered email address
                        mAuth.sendPasswordResetEmail(email)
                                .addOnCompleteListener(new OnCompleteListener<Void>() {
                                    @Override
                                    public void onComplete(@NonNull Task<Void> task) {
                                        mProgressDialog.dismiss();
                                        if (task.isSuccessful()) {
                                            // give notification if instructions reset
                                            // password was send to your email
                                            Toast.makeText(SingActivity.this,
                                                    "We have sent you instructions" +
                                                            " to reset your password!",
                                                    Toast.LENGTH_SHORT).show();
                                            int finishTime = 3; //10 secs
                                            Handler handler = new Handler();
                                            handler.postDelayed(new Runnable() {
                                                public void run() {
                                                    dialog.cancel();
                                                }
                                            }, finishTime * 300);
                                        } else {
                                            // notify to user if system cant send
                                            // instructions to reset the password
                                            Toast.makeText(SingActivity.this,
                                                    "Failed to send an email!",
                                                    Toast.LENGTH_SHORT).show();
                                        }


                                    }
                                });
                    }
                });
                // set negative button: Cancel
                alertDialogBuilder.setNegativeButton("Cancel",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,int id) {
                        // cancel the alert box and put a Toast to the user
                        dialog.cancel();
                        // notify to user hes press the cancel button
                        Toast.makeText(getApplicationContext(), "Canceled",
                                Toast.LENGTH_LONG).show();
                    }
                });
                AlertDialog alertDialog = alertDialogBuilder.create();
                // show alert
                alertDialog.show();
            }
        });

        mBtnAnon = (Button) findViewById(R.id.btnAnon);
        mBtnAnon.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mProgressDialog.show();
                mProgressDialog.setMessage("Please wait...");
                mAuth.signInAnonymously()
                        .addOnCompleteListener(SingActivity.this, new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                Log.d("user", "signInAnonymously:onComplete:" + task.isSuccessful());
                                mProgressDialog.dismiss();
                                // If sign in fails, display a message to the user. If sign in succeeds
                                // the auth state listener will be notified and logic to handle the
                                // signed in user can be handled in the listener.
                                if (!task.isSuccessful()) {
                                    Log.w("user", "signInAnonymously", task.getException());
                                    Toast.makeText(SingActivity.this, "Authentication failed.",
                                            Toast.LENGTH_SHORT).show();
                                }

                            }
                        });
            }
        });



    }

    // Radio button
    public void onRadioButtonClicked(View view) {
        // Is the button now checked?
        boolean checked = ((RadioButton) view).isChecked();

        // Check which radio button was clicked
        switch(view.getId()) {
            case R.id.radio_singup:
                if (checked)

                    // set button in singUp mode
                    mBtnGO.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            Log.d("user", "signUp");
                            if (!validateForm()) {
                                return;
                            }
                            //getString from editText
                            String email = mTxtEmail.getText().toString();
                            final String password = mTxtPass.getText().toString();
                            //Progress singUp
                            mProgressDialog.show();
                            mProgressDialog.setMessage("Please wait...");
                            mAuth.createUserWithEmailAndPassword(email, password)
                                    .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                                        @Override
                                        public void onComplete(@NonNull Task<AuthResult> task) {
                                            Log.d("user", "createUser:onComplete:" +
                                                    task.isSuccessful());

                                            mProgressDialog.dismiss();
                                            if (task.isSuccessful()) {
                                                onAuthSuccess(task.getResult().getUser());
                                            } else {
                                                // there was an error
                                                if (password.length() < 6) {
                                                    mTxtPass.setError(getString(R.string.min_pwd));
                                                } else {
                                                    Toast.makeText(SingActivity.this,
                                                            "Oops! ada masalah dengan email anda," +
                                                                    " coba periksa kembali!!",
                                                            Toast.LENGTH_LONG).show();
                                                }

                                            }
                                        }
                                    });
                        }
                    });
                // End of singUp task
                break;
            case R.id.radio_singin:
                if (checked)
                    //SingIn Mode
                    mBtnGO.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            Log.d("user", "signIn");

                            if (!validateForm()) {
                                return;
                            }

                            String email = mTxtEmail.getText().toString();
                            final String password = mTxtPass.getText().toString();
                            //Progress singIn
                            mProgressDialog.show();
                            mProgressDialog.setMessage("Please wait...");
                            mAuth.signInWithEmailAndPassword(email, password)
                                    .addOnCompleteListener(SingActivity.this, new OnCompleteListener<AuthResult>() {
                                        @Override
                                        public void onComplete(@NonNull Task<AuthResult> task) {
                                            // If sign in fails, display a message to the user. If sign in succeeds
                                            // the auth state listener will be notified and logic to handle the
                                            // signed in user can be handled in the listener.
                                            mProgressDialog.dismiss();

                                            if (!task.isSuccessful()) {

                                                // there was an error
                                                if (password.length() < 6) {
                                                    mTxtPass.setError(getString(R.string.min_pwd));
                                                } else {
                                                    Toast.makeText(SingActivity.this,
                                                            getString(R.string.mAuth_fail),
                                                            Toast.LENGTH_LONG).show();
                                                }
                                            } else {
                                                Toast.makeText(SingActivity.this, "Welcome back " +
                                                                mTxtEmail.getText().toString(),
                                                        Toast.LENGTH_SHORT).show();


                                                startActivity(new Intent(SingActivity.this,
                                                        MainActivity.class));
                                                finish();
                                            }
                                        }
                                    });
                        }
                    });

                //End of progress singIn
                break;

            default:
                break;
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        mAuth.addAuthStateListener(mAuthStateListener);
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mAuthStateListener != null) {
            mAuth.removeAuthStateListener(mAuthStateListener);
        }
    }

    //If singUp was success email from database converted to username from this method and save it
    //on WriteNewUser task
    private void onAuthSuccess(FirebaseUser user) {
        String username = usernameFromEmail(user.getEmail());

        // Write new user
        writeNewUser(user.getUid(), username, user.getEmail());

        // Go to MainActivity
        startActivity(new Intent(SingActivity.this, MainActivity.class));
        finish();
    }

    //Get username from email
    private String usernameFromEmail(String email) {
        if (email.contains("@")) {
            return email.split("@")[0];
        } else {
            return email;
        }
    }

    private boolean validateForm() {
        boolean result = true;
        if (TextUtils.isEmpty(mTxtEmail.getText().toString())) {
            mTxtEmail.setError("Required");
            result = false;
        } else {
            mTxtEmail.setError(null);
        }

        if (TextUtils.isEmpty(mTxtPass.getText().toString())) {
            mTxtPass.setError("Required");
            result = false;
        } else {
            mTxtPass.setError(null);
        }

        return result;
    }


    // [START basic_write on Firebase Database]
    private void writeNewUser(String userId, String name, String email) {
        User user = new User(name, email);

        mDatabase.child("users").child(userId).setValue(user);
    }

}