Problems with the backstack feature

I am working on my MainActivity.java class and trying to implement backstack for navigating between fragments and activity. Even after using addToBackStack(null) and popbackStack0, I am facing issues with the functionality.

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener, OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        //ImageView imageView=(ImageView) findViewById(R.id.mainpage);
        //imageView.setImageResource(R.drawable.banner);

       Button button1 = (Button) findViewById(R.id.cropbutton);
        button1.setOnClickListener(this);
        Button button2 = (Button) findViewById(R.id.diseasebutton);
        button2.setOnClickListener(this);
        Button button3 = (Button) findViewById(R.id.pestbutton);
        button3.setOnClickListener(this);
        Button button5 = (Button) findViewById(R.id.expertbutton);
        button5.setOnClickListener(this);



        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
    }
    //boolean doubleBackToExitPressedOnce = false;

    @Override
    public void onBackPressed()
    {


    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();
        Button button1 = (Button) findViewById(R.id.cropbutton);
        Button button2 = (Button) findViewById(R.id.diseasebutton);
        Button button3=(Button) findViewById(R.id.pestbutton);
        Button button5 = (Button) findViewById(R.id.expertbutton);
        if (id == R.id.nav_camera) {
            Cropfragment cropfragment=new Cropfragment();
            FragmentManager manager=getSupportFragmentManager();
            manager.beginTransaction().replace(R.id.relative1,cropfragment,cropfragment.getTag()).addToBackStack(null).commit();
            manager.popBackStack("relative1",0);

        } else if (id == R.id.nav_gallery) {
            BlankFragment blankFragment=new BlankFragment();
            FragmentManager manager=getSupportFragmentManager();
            manager.beginTransaction().replace(R.id.relative1,blankFragment,blankFragment.getTag()).addToBackStack(null).commit();
            manager.popBackStack("relative1",0);

        }  else if (id == R.id.nav_home) {
            Intent appInfo = new Intent(MainActivity.this, MainActivity.class);
            startActivity(appInfo);

        } else if (id == R.id.nav_pesti) {
            pest blankFragment=new pest();
            FragmentManager manager=getSupportFragmentManager();
            manager.beginTransaction().replace(R.id.relative1,blankFragment,blankFragment.getTag()).addToBackStack(null).commit();
            manager.popBackStack("relative1",0);

        }
        else if (id == R.id.nav_expert) {

            Intent appInfo = new Intent(MainActivity.this, detail_expert.class);

            startActivity(appInfo);
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }


    @Override
    public void onClick(View v) {
        Button button1 = (Button) findViewById(R.id.cropbutton);
        Button button2 = (Button) findViewById(R.id.diseasebutton);
        Button button3=(Button) findViewById(R.id.pestbutton);
        Button button5 = (Button) findViewById(R.id.expertbutton);
        switch (v.getId()) {

            case R.id.cropbutton:
                Cropfragment cropfragment = new Cropfragment();
            FragmentManager manager = getSupportFragmentManager();
            manager.beginTransaction().replace(R.id.relative1, cropfragment, cropfragment.getTag()).addToBackStack(null).commit();
                manager.popBackStack("relative1", 0);
                break;

            case R.id.diseasebutton:
                BlankFragment blankFragment= new BlankFragment();
                FragmentManager manager1 = getSupportFragmentManager();
                manager1.beginTransaction().replace(R.id.relative1,blankFragment,blankFragment.getTag()).addToBackStack(null).commit();
                manager1.popBackStack("relative1",0);
                break;

            case R.id.pestbutton:
                pest pestFragment= new pest();
                FragmentManager manager2 = getSupportFragmentManager();
                manager2.beginTransaction().replace(R.id.relative1,pestFragment,pestFragment.getTag()).addToBackStack(null).commit();
                manager2.popBackStack("relative1",0);
                break;

            case R.id.expertbutton:
                Intent appInfo1 = new Intent(MainActivity.this, detail_expert.class);
                startActivity(appInfo1);
                break;

            default:
                break;
        }

    }

}
javascriptjavaandroidandroid-fragmentsback-stack

Answer №1

After reviewing the code, it seems like there might be some confusion on how to navigate. By using addBackStack with a tag instead of null and removing with the tag as well 

manager.popBackStack("relative1",0);
. Alternatively, you can simply use popBackStack() or if you prefer using onBackPressed(), you will need to override the method, determine the fragment size, and pop them one by one in the activity.

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