get Previous Fragment In Back Stack - Android User Interface

Android examples for User Interface:Fragment

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Description

get Previous Fragment In Back Stack

Demo Code


//package com.java2s;
import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

public class Main {
    public static Fragment getPreviousFragmentInBackStack(
            FragmentManager fragmentManager) {

        Fragment higherFragment = getHigherFragmentInStack(fragmentManager);

        if (higherFragment != null) {
            FragmentManager fragmentMangerInHigherLevel = higherFragment
                    .getFragmentManager();

            int countFragmentsInLevel = fragmentMangerInHigherLevel
                    .getBackStackEntryCount();

            if (countFragmentsInLevel > 1) {

                final String tagPrevious = fragmentManager
                        .getBackStackEntryAt(countFragmentsInLevel - 2)
                        .getName();/*from  ww w. ja  v a2s.  co m*/
                return fragmentManager.findFragmentByTag(tagPrevious);
            } else {

                return higherFragment.getParentFragment();
            }

        }

        return null;
    }

    public static Fragment getHigherFragmentInStack(
            FragmentManager fragmentManager) {

        Fragment currentHigherFragment = null;
        int countFragment = fragmentManager.getBackStackEntryCount();

        if (countFragment > 0) {
            final String tag = fragmentManager.getBackStackEntryAt(
                    countFragment - 1).getName();
            currentHigherFragment = fragmentManager.findFragmentByTag(tag);

            Fragment childFragment = getHigherFragmentInStack(currentHigherFragment
                    .getChildFragmentManager());

            if (childFragment != null) {
                currentHigherFragment = childFragment;
            }

        }

        return currentHigherFragment;
    }
}

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