UserActivity.java

package com.mapps.seproject;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class UserActivity extends AppCompatActivity implements View.OnClickListener {

    FirebaseAuth firebaseAuth;
    Button bSignOut;
    Button bComposeMail;
    TextView welcome;
    Spinner dropdown;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user);

        welcome = (TextView) findViewById(R.id.tvWelcome);
        bSignOut = (Button) findViewById(R.id.bSignOut);
        bComposeMail = (Button) findViewById(R.id.bComposeMail);

        firebaseAuth = FirebaseAuth.getInstance();


        if(firebaseAuth.getCurrentUser() == null)   {                               // Incase the user hasnt logged in

            finish();
            startActivity(new Intent(getApplicationContext(),LoginActivity.class));         // Go back to login activity

        }

        FirebaseUser user = firebaseAuth.getCurrentUser();                                  // Get user
        welcome.setText("Welcome "+user.getEmail());// Get Emailx

        dropdown = (Spinner) findViewById(R.id.spSelectCitiy);
        String [] items = new String[]{"Coimbatore","Chennai"};
        ArrayAdapter <String> arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,items);
        dropdown.setAdapter(arrayAdapter);




        bSignOut.setOnClickListener(this);                                                    // Start listener on Button
        bComposeMail.setOnClickListener(this);
        dropdown.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                switch (position)  {

                    case  0:
                        // setCityCoimbatore();
                        Log.i("City: ","Coimbatore");
                        break;

                    case 1: