src/main/java/de/pixart/messenger/ui/SettingsFragment.java


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package de.pixart.messenger.ui;

import android.app.Dialog;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.preference.PreferenceScreen;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

import de.pixart.messenger.R;

public class SettingsFragment extends PreferenceFragment {

    //http://stackoverflow.com/questions/16374820/action-bar-home-button-not-functional-with-nested-preferencescreen/16800527#16800527
    private void initializeActionBar(PreferenceScreen preferenceScreen) {
        final Dialog dialog = preferenceScreen.getDialog();

        if (dialog != null) {
            View homeBtn = dialog.findViewById(android.R.id.home);

            if (homeBtn != null) {
                View.OnClickListener dismissDialogClickListener = new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        dialog.dismiss();
                    }
                };

                ViewParent homeBtnContainer = homeBtn.getParent();

                if (homeBtnContainer instanceof FrameLayout) {
                    ViewGroup containerParent = (ViewGroup) homeBtnContainer.getParent();
                    if (containerParent instanceof LinearLayout) {
                        containerParent.setOnClickListener(dismissDialogClickListener);
                    } else {
                        ((FrameLayout) homeBtnContainer).setOnClickListener(dismissDialogClickListener);
                    }
                } else {
                    homeBtn.setOnClickListener(dismissDialogClickListener);
                }
            }
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);
    }

    @Override
    public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
        super.onPreferenceTreeClick(preferenceScreen, preference);
        if (preference instanceof PreferenceScreen) {
            initializeActionBar((PreferenceScreen) preference);
        }
        return false;
    }
}