android login with php mysql

JI'm working on android login with php mysql and the login function takes forever. I'm trying to get to the bottom of this only im unsure whats causing it.

below : main activity and connexion

public class MainActivity extends AppCompatActivity {
private EditText phonenumber, password;
private com.rey.material.widget.CheckBox checkboxRememberMe;
private DatabaseReference table_user;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
phonenumber = findViewById(R.id.username1);
password = findViewById(R.id.password1);
Button buttonLogin = findViewById(R.id.buttonSignIn);
checkboxRememberMe = findViewById(R.id.checkbox1);
ImageView topIcon = findViewById(R.id.icon1);
TextView forgotPassword = findViewById(R.id.forgotpassword1);
// 2000ms = 2secs which is the delay for the splash screen
// handler.postDelayed(runnable, 2000);
//initialize Paper
Paper.init(this);
// check remember user
String phone = Paper.book().read(Common.USER_KEY);
String pass = Paper.book().read(Common.PASS_KEY);
if (phone != null && pass != null){
if (!phone.isEmpty() && !pass.isEmpty()){
login(phone, pass);
}
}
// init Firebase
table_user = FirebaseDatabase.getInstance().getReference("User");
forgotPassword.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent forgotLayout = new Intent(MainActivity.this, ForgotPassword.class);
startActivity(forgotLayout);
}
});
buttonLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// make sure the input fields are not empty
if (phonenumber.getText().length() > 0 && password.getText().length() > 0) {
if (Common.isConnectedToInternet(getBaseContext())) {
//save username and password
if (checkboxRememberMe.isChecked()){
Paper.book().write(Common.USER_KEY, phonenumber.getText().toString());
Paper.book().write(Common.PASS_KEY, password.getText().toString());
}
// display a loading dialog
final ProgressDialog mDialog = new ProgressDialog(MainActivity.this);
mDialog.setMessage("Please wait...");
mDialog.show();
table_user.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
// check user exists in db
if (dataSnapshot.child(phonenumber.getText().toString()).exists()) {
mDialog.dismiss();
// get user info
User user = dataSnapshot.child(phonenumber.getText().toString()).getValue(User.class);
assert user != null;
if (user.getPassword().equals(password.getText().toString())) {
Toast.makeText(MainActivity.this, "Welcome", Toast.LENGTH_SHORT).show();
Intent home = new Intent(MainActivity.this, Home.class);
Common.currentUser = user;
startActivity(home);
finish();
} else {
Toast.makeText(MainActivity.this, "Please try again", Toast.LENGTH_SHORT).show();
}
} else {
mDialog.dismiss();
Toast.makeText(MainActivity.this, "User doesn't exist", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}else {
Toast.makeText(MainActivity.this, "Please make sure you're connected to the Internet", Toast.LENGTH_SHORT).show();
}
}else {
Toast.makeText(MainActivity.this, "Username/Password can not be empty", Toast.LENGTH_SHORT).show();
}
}
});
}
private void login(final String phone, final String pass) {
// init Firebase
table_user = FirebaseDatabase.getInstance().getReference("User");
if (Common.isConnectedToInternet(getBaseContext())) {
// display a loading dialog
final ProgressDialog mDialog = new ProgressDialog(MainActivity.this);
mDialog.setMessage("Please wait...");
mDialog.show();
table_user.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
// check user exists in db
if (dataSnapshot.child(phone).exists()) {
mDialog.dismiss();
// get user info
User user = dataSnapshot.child(phone).getValue(User.class);
assert user != null;
if (user.getPassword().equals(pass)) {
Toast.makeText(MainActivity.this, "Welcome", Toast.LENGTH_SHORT).show();
Intent home = new Intent(MainActivity.this, Home.class);
Common.currentUser = user;
startActivity(home);
finish();
} else {
Toast.makeText(MainActivity.this, "Please try again", Toast.LENGTH_SHORT).show();
}
} else {
mDialog.dismiss();
Toast.makeText(MainActivity.this, "User doesnt exist", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}else {
Toast.makeText(MainActivity.this, "Please make sure you're connected to the Internet", Toast.LENGTH_SHORT).show();
}

public class Common {
public static User currentUser;
public static final String USER_KEY = "User";
public static final String PASS_KEY = "Password";
// for the mysql db
public static final String URL_REQUEST = "10.0.2.2/gani/login.php";
// check if Device is connected to internet or not.
public static boolean isConnectedToInternet(Context context){
ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivityManager != null){
NetworkInfo[] info = connectivityManager.getAllNetworkInfo();
if (info != null){
for (NetworkInfo anInfo : info) {
if (anInfo.isConnectedOrConnecting()) {
return true;
}
}
}
}
return false;
}