Move to a particular tab of bottom navigation from an activity

Question

I am working on a project in which I used Bottom Navigation Bar. On Nav Bar, I used 4 menu items(Profile, Home, Reservation, Logout), for them I used fragment. Moving to Home, a list of restaurant will be appear. When the user tap on any restaurant from the list, an activity( name ReservationInfo ) will be opened. There are 3 edit text fields and a button in ReservationInfo activity. When the user click on the button it will move to the fragment(Reservation) which is placed on third position of bottom nav bar.

The question is how to move from activity to fragmentand the fragment is set to the 3rd menu item of the bottom navigation bar.

Here is the code:

Resrvation.java

package restaurantlocator.application;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;


public class Resrvation extends AppCompatActivity {

    Button reserve;
    ImageButton imageButton;
    EditText food, chooseTime, date;
    DataBaseHelper db;
//  ReservationInfo reservationInfo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_resrvation);
        db = new DataBaseHelper(this);

        food = (EditText) findViewById(R.id.etfood);
        chooseTime = (EditText) findViewById(R.id.ettime);
        date = (EditText) findViewById(R.id.edate);
        reserve = (Button) findViewById(R.id.btnreserve);
        imageButton = (ImageButton) findViewById(R.id.imgButton);
        imageButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                finish();
            }
        });

        //reservationInfo = new ReservationInfo();

        reserve.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (!emptyValidation()) {
                    db.AddData(new Data(food.getText().toString(),
                            chooseTime.getText().toString(),
                            date.getText().toString()));
                    AlertMessage();
                    food.setText(null);
                    chooseTime.setText(null);
                    date.setText(null);

                } else {
                    Toast.makeText(Resrvation.this, "Empty Fields", Toast.LENGTH_SHORT).show();
                }
            }

            private void AlertMessage() {
                AlertDialog.Builder builder = new AlertDialog.Builder(Resrvation.this);
                builder.setTitle("Reserved!");
                builder.setMessage("A notification will be send on your device regarding your reservation.");
                builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                            //move to fragment ReservationInfo
                    }
                });
                builder.show();
            }
        });
    }

    private boolean emptyValidation() {
        if (TextUtils.isEmpty(food.getText().toString()) || TextUtils.isEmpty(chooseTime.getText().toString())) {
            return true;
        } else {
            return false;
        }
    }
}

BottomNavigation.java

package restaurantlocator.application;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.FrameLayout;

public class BottomNavigation extends AppCompatActivity {

    private BottomNavigationView mMianNav;
    private FrameLayout mMainFrame;
    private HomeActivity homeActivity;
    private ReservationInfo reservationInfo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_bottom_navigation);
        startService(new Intent(this, NotificationService.class));

        mMainFrame = (FrameLayout) findViewById(R.id.main_frame);
        mMianNav = (BottomNavigationView) findViewById(R.id.main_nav);

        homeActivity = new HomeActivity();
        reservationInfo = new ReservationInfo();
        setFragment(homeActivity);


        //Listener for handling selection events on bottom navigation items
        mMianNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {

                switch (menuItem.getItemId()) {

                    case R.id.tohome:
                        setFragment(homeActivity);
                        return true;

                    case R.id.toresrvation:
                        setFragment(reservationInfo);
                        return true;

                    case R.id.tologout:
                        logout();
                        return true;

                    default:
                        return false;
                }
            }

            private void logout() {
                Intent intent = new Intent(BottomNavigation.this, Registration.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);
                finish();
            }

        });
    }

    private void setFragment(Fragment fragment) {
        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
        fragmentTransaction.replace(R.id.main_frame, fragment);
        fragmentTransaction.commit();
        fragmentTransaction.addToBackStack(null);
    }

    public void onBackPressed() {
        Intent homeIntent = new Intent(Intent.ACTION_MAIN);
        homeIntent.addCategory(Intent.CATEGORY_HOME);
        homeIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(homeIntent);
        finish();

    }

}

Answer 1

Solution:

Follow the steps below:

Step1: Add the lines as shown in below reserve click listener

reserve.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        ....
        ....
        Intent intent = new Intent(Resrvation.this, BottomNavigation.class);
        intent.putExtra("FromReservation", "1");
        startActivity(intent);
        ....
    }
}

Next, Step2: In your write the below code in onCreate() of BottomNavigation class:

Intent i = getIntent();
String data = i.getStringExtra("FromReservation");

if (data != null && data.contentEquals("1")) {

    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
    fragmentTransaction.replace(R.id.main_frame, new ReservationInfo());
    fragmentTransaction.commitNow();

    mMianNav.setSelectedItemId(R.id.toresrvation);

}

Try it, If any problem, do comment below.

Answer 2

All you need to do is just use startActivityForResults instead of startActivity when user selects a restaurant from your home fragment.

e.g :

startActivityForResult(yourIntent, 1000);

And on the reservationInfo Activity in the onClick function use

Intent returnIntent = new Intent();
setResult(Activity.RESULT_CANCELED, returnIntent);
finish();

And then in your first activity override onActivityResult() method and set the selected fragment as reservation if request code matches

e.g:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == 1000) {
    mMianNav.setSelectedItemId(R.id.toresrvation);
}

}