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import android.content.Context;

import android.content.Intent;

import android.net.Uri;

import android.nfc.Tag;

import android.os.Bundle;

import android.support.annotation.NonNull;

import android.support.v4.app.Fragment;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import android.widget.Toast;



import com.bumptech.glide.Glide;

import com.bumptech.glide.request.RequestOptions;

import com.google.android.gms.tasks.OnCompleteListener;

import com.google.android.gms.tasks.Task;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseUser;

import com.google.firebase.firestore.DocumentSnapshot;

import com.google.firebase.firestore.FirebaseFirestore;

import com.google.firebase.storage.FirebaseStorage;

import com.google.firebase.storage.StorageReference;



import java.util.ArrayList;

import java.util.List;

import java.util.zip.Inflater;



import de.hdodenhof.circleimageview.CircleImageView;



import static android.support.constraint.Constraints.TAG;





/**

 * A simple {@link Fragment} subclass.

 */

public class AccountFragment extends Fragment {



  private StorageReference storageReference;

  private FirebaseAuth firebaseAuth;

  private FirebaseFirestore firebaseFirestore;

  private Uri mainImageURI = null;

  private String user_id;

  private TextView accountName;

  private CircleImageView accountImage;



  public AccountFragment() {

    // Required empty public constructor

  }





  @Override

  public View onCreateView(LayoutInflater inflater, ViewGroup container,

    Bundle savedInstanceState) {

    // Inflate the layout for this fragment

    View view = inflater.inflate(R.layout.fragment_account, container, false);



    getUser();



    return view;

  }



  protected void getUser() {



    FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();



    user_id = firebaseAuth.getCurrentUser().getUid();

    accountName = getView().findViewById(R.id.account_name);

    accountImage = getView().findViewById(R.id.account_image);



    firebaseFirestore.collection("Users").document(user_id).get().addOnCompleteListener(new OnCompleteListener < DocumentSnapshot > () {

      @Override

      public void onComplete(@NonNull Task < DocumentSnapshot > task) {



        if (task.isSuccessful()) {



          if (task.getResult().exists()) {



            String name = task.getResult().getString("name");

            String image = task.getResult().getString("image");



            mainImageURI = Uri.parse(image);



            accountName.setText(name);



            RequestOptions placeholderRequest = new RequestOptions();

            placeholderRequest.placeholder(R.drawable.person);



            Glide.with(AccountFragment.this).setDefaultRequestOptions(placeholderRequest).load(image).into(accountImage);

          }



        } else {



          String error = task.getException().getMessage();

          Toast.makeText(getContext(), "(FIRESTORE Retrieve Error) : " + error, Toast.LENGTH_LONG).show();



        }





      }

    });



  }

}

import android.content.Intent;

import android.nfc.Tag;

import android.support.annotation.NonNull;

import android.support.design.widget.BottomNavigationView;

import android.support.design.widget.FloatingActionButton;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentTransaction;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.support.v7.widget.Toolbar;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Toast;



import com.google.android.gms.tasks.OnCompleteListener;

import com.google.android.gms.tasks.Task;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseUser;

import com.google.firebase.firestore.DocumentSnapshot;

import com.google.firebase.firestore.FirebaseFirestore;



public class MainActivity extends AppCompatActivity {



  private Toolbar mainToolbar;

  private FirebaseAuth mAuth;

  private FirebaseFirestore firebaseFirestore;



  private String current_user_id;



  private FloatingActionButton addPostBtn;



  private BottomNavigationView mainbottomNav;



  private HomeFragment homeFragment;

  private NotificationFragment notificationFragment;

  private AccountFragment accountFragment;



  @Override

  protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    mAuth = FirebaseAuth.getInstance();

    firebaseFirestore = FirebaseFirestore.getInstance();



    mainToolbar = (Toolbar) findViewById(R.id.main_toolbar);

    setSupportActionBar(mainToolbar);



    getSupportActionBar().setTitle("PhotoGram");



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



      mainbottomNav = findViewById(R.id.mainbottom_nav);



      // FRAGMENTS

      homeFragment = new HomeFragment();

      notificationFragment = new NotificationFragment();

      accountFragment = new AccountFragment();



      initializeFragment();



      mainbottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {

        @Override

        public boolean onNavigationItemSelected(@NonNull MenuItem item) {



          Fragment currentFragment = getSupportFragmentManager().findFragmentById(R.id.main_container);



          switch (item.getItemId()) {



            case R.id.bottom_home_btn:



              replaceFragment(homeFragment, currentFragment);

              return true;



            case R.id.bottom_account_btn:



              replaceFragment(accountFragment, currentFragment);

              return true;



            case R.id.bottom_notification_btn:



              replaceFragment(notificationFragment, currentFragment);

              return true;



            default:

              return false;





          }



        }

      });





      addPostBtn = findViewById(R.id.add_post_btn);

      addPostBtn.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View v) {



          Intent newPostIntent = new Intent(MainActivity.this, NewPostActivity.class);

          startActivity(newPostIntent);



        }

      });

    }

  }



  @Override

  protected void onStart() {

    super.onStart();



    FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();

    if (currentUser == null) {



      sendToLogin();



    } else {



      current_user_id = mAuth.getCurrentUser().getUid();



      firebaseFirestore.collection("Users").document(current_user_id).get().addOnCompleteListener(new OnCompleteListener < DocumentSnapshot > () {

        @Override

        public void onComplete(@NonNull Task < DocumentSnapshot > task) {



          if (task.isSuccessful()) {



            if (!task.getResult().exists()) {



              Intent setupIntent = new Intent(MainActivity.this, SetupActivity.class);

              startActivity(setupIntent);

              finish();



            }



          } else {



            String errorMessage = task.getException().getMessage();

            Toast.makeText(MainActivity.this, "Error : " + errorMessage, Toast.LENGTH_LONG).show();

          }

        }

      });

    }

  }





  @Override

  public boolean onCreateOptionsMenu(Menu menu) {



    getMenuInflater().inflate(R.menu.main_menu, menu);

    return true;



  }



  @Override

  public boolean onOptionsItemSelected(MenuItem item) {



    switch (item.getItemId()) {



      case R.id.action_logout_btn:

        logOut();

        return true;



      case R.id.action_setting_btn:



        Intent settingsIntent = new Intent(MainActivity.this, SetupActivity.class);

        startActivity(settingsIntent);



        return true;





      default:

        return false;





    }



  }



  private void logOut() {





    mAuth.signOut();

    sendToLogin();

  }



  private void sendToLogin() {



    Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class);

    startActivity(loginIntent);

    finish();



  }



  private void initializeFragment() {



    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();



    fragmentTransaction.add(R.id.main_container, homeFragment);

    fragmentTransaction.add(R.id.main_container, notificationFragment);

    fragmentTransaction.add(R.id.main_container, accountFragment);



    fragmentTransaction.hide(notificationFragment);

    fragmentTransaction.hide(accountFragment);



    fragmentTransaction.commit();



  }



  private void replaceFragment(Fragment fragment, Fragment currentFragment) {



    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();

    if (fragment == homeFragment) {



      fragmentTransaction.hide(accountFragment);

      fragmentTransaction.hide(notificationFragment);



    }



    if (fragment == accountFragment) {



      fragmentTransaction.hide(homeFragment);

      fragmentTransaction.hide(notificationFragment);



    }



    if (fragment == notificationFragment) {



      fragmentTransaction.hide(homeFragment);

      fragmentTransaction.hide(accountFragment);



    }

    fragmentTransaction.show(fragment);



    //fragmentTransaction.replace(R.id.main_container, fragment);

    fragmentTransaction.commit();



  }



}