public class SignInActivity extends AppCompatActivity  {

private EditText SignInMail, SignInPass;
private FirebaseAuth auth;
private Button SignInButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Get Firebase auth instance
    auth = FirebaseAuth.getInstance();



    // set the view now
    setContentView(R.layout.activity_signin);
    SignInMail = (EditText) findViewById(R.id.SignInMail);
    SignInPass = (EditText) findViewById(R.id.SignInPass);
    SignInButton = (Button) findViewById(R.id.SignInButton);

    //Get Firebase auth instance
    auth = FirebaseAuth.getInstance();

    SignInButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String email = SignInMail.getText().toString();
            final String password = SignInPass.getText().toString();
            if (TextUtils.isEmpty(email)) {
                Toast.makeText(getApplicationContext(), "Mail", Toast.LENGTH_SHORT).show();
                return;
            }
            if (TextUtils.isEmpty(password)) {
                Toast.makeText(getApplicationContext(), "Password", Toast.LENGTH_SHORT).show();
                return;
            }
            //authenticate user
            auth.signInWithEmailAndPassword(email, password)
                    .addOnCompleteListener(SignInActivity.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.
                           // progressBar.setVisibility(View.GONE);
                            if (!task.isSuccessful()) {
                                // there was an error
                                if (password.length() < 8) {
                                    Toast.makeText(getApplicationContext(),"pass min 8",Toast.LENGTH_SHORT).show();
                                } else {
                                    Toast.makeText(getApplicationContext(),"error",Toast.LENGTH_SHORT).show();
                                }
                            } else {
                                Intent intent = new Intent(SignInActivity.this, CampaignActivity.class);
                                startActivity(intent);
                                finish();
                            }
                        }
                    });
        }
    });

   }


public void NavigateSignUp(View v) {
    Intent inent = new Intent(this, SignupActivity.class);
    startActivity(inent);
}
public void NavigateForgetMyPassword(View v) {
    Intent inent = new Intent(this, ResetPasswordActivity.class);
    startActivity(inent);
}
}