pressing back button application mixes in android

Question

facing issue with pressing back button in my Fragement .pressing back my application got mixed with other fragments.

can any one help me

I have 4 Fragements

DealerDetails.java

 rootView.setFocusableInTouchMode(true);
    rootView.requestFocus();
    rootView.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            // Log.i(tag, "keyCode: " + keyCode);
            if (keyCode == KeyEvent.KEYCODE_BACK) {

                // Log.i(tag, "onKey Back listener is working!!!");
                // getFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);

                Fragment fragment = new DealerByNamesFragement();
                FragmentManager fragmentManager = getFragmentManager();
                fragmentManager.beginTransaction()
                        .replace(R.id.frame_container, fragment).commit();

                return true;
            } else {
                return false;
            }
        }
    });

By pressing back button i want to show DealerByNamesFragement.java

DealerByNamesFragement.java

    rootView.setFocusableInTouchMode(true);
            rootView.requestFocus();
            rootView.setOnKeyListener(new View.OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    // Log.i(tag, "keyCode: " + keyCode);

                        if(keyCode == KeyEvent.KEYCODE_BACK && keyCode == KeyEvent.ACTION_DOWN ) {

                            // Log.i(tag, "onKey Back listener is working!!!");
                            // getFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);

                            Fragment fragment = new DealerSearchFragment();
                            FragmentManager fragmentManager = getFragmentManager();
                            fragmentManager.beginTransaction()
                                    .replace(R.id.frame_container, fragment).addToBackStack("tag1").commit();

                        return true;
                    } else {
                        return false;
                    }
                }
            });

By pressing back redirecting to DealerSearchFragment.java

DealerSearchFragment.java

 rootView.setFocusableInTouchMode(true);
            rootView.requestFocus();
            rootView.setOnKeyListener(new View.OnKeyListener() {
                @Override
                public boolean onKey(View v, int keyCode, KeyEvent event) {
                    // Log.i(tag, "keyCode: " + keyCode);
                    if (keyCode == KeyEvent.KEYCODE_BACK) {

                        // Log.i(tag, "onKey Back listener is working!!!");
                        // getFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);

                        Fragment fragment = new HomeFragment();
                        FragmentManager fragmentManager = getFragmentManager();
                        fragmentManager.beginTransaction()
                                .replace(R.id.frame_container, fragment).commit();

                        return true;
                    } else {
                        return false;
                    }
                }
            });

Answer 1

Do you have onBackPressed() in your activity?

Don't forget to set addToBackStack to null when calling new fragment from activity.

mFragmentTransaction.addToBackStack(null);

and add onBackPressed() method to the activity in order to finish the back button process

@Override
public void onBackPressed() {
    if (getFragmentManager().getBackStackEntryCount() == 0) {
        this.finish();
    } else {
        getFragmentManager().popBackStack();
    }
}