How to go back to first Android Fragment after replace

Question

I\'m trying to get back to the first fragment after replacing it, but supportFragmentManager.popBackStackImmediate() do not work...

override fun onCreate(sav         


        

Answer 1

At starting i use popbackstack method but in this it iterate loop every time when back button is pressed. So i change my concept instead of popbackstack i maintain constant variable. and using this i manage my fragment. For that Follow Below Steps.

Step 1: make atleast two Global Variable.

    public static String currentTAG="HomeFragment";
    public static String AboutUsFragment="AboutUsFragment";
    public static String HelpfulTipsFragment="HelpfulTipsFragment";

Step 2: Change CurrentTag value when Fragment Open.

In Home Fragment in currentTAG=HomeFragment similarly for aboutUsFragment set CurrentTAG=AboutUsFragment;

Step 3: Then After in Your main Activity Write down Below Code in Onbackpress method.

if (Const.currentTAG.equals(Const.HomeFragment)) {
            ExitApp();
        }else{
         getSupportFragmentManager().beginTransaction().replace(R.id.maincontainer, new HomeFragment()).addToBackStack(null).commit();
        }


      private void ExitApp() {
    final AlertDialog.Builder builder = new AlertDialog.Builder(context);

    builder.setTitle(R.string.app_name);
    builder.setMessage(R.string.ask_before_close);
    builder.setIcon(R.mipmap.ic_launcher);
    //final AlertDialog dialog = builder.create();
    builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {

            finish();

        }
    });
    builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {

        }
    });
    builder.show();
}

Similarly You Can Manage Multiple Fragment Without Iterating loop and popbackstack.

NOTE: When You Load Fragment Use Replace instead of add like below Code

 getSupportFragmentManager().beginTransaction().replace(R.id.maincontainer, new AboutAppFragment()).addToBackStack(null).commit();