net.alexjf.tmm.adapters.TabAdapter.java Source code

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Here is the source code for net.alexjf.tmm.adapters.TabAdapter.java

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/*******************************************************************************
 * Copyright (c) 2013 - Alexandre Jorge Fonseca (alexjf.net)
 * License: GPL v3 (http://www.gnu.org/licenses/gpl-3.0.txt)
 ******************************************************************************/
package net.alexjf.tmm.adapters;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBar.Tab;
import android.support.v7.app.ActionBarActivity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import net.alexjf.tmm.R;
import net.alexjf.tmm.utils.PreferenceManager;

import java.util.ArrayList;
import java.util.Arrays;

/**
 * Based on http://stackoverflow.com/a/10082836/441265
 */
public class TabAdapter extends FragmentPagerAdapter
        implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
    private final static String KEY_TABNAV = "pref_key_tab_navigation";

    private final Activity activity;
    private final ActionBar actionBar;
    private final ViewPager viewPager;
    private final ArrayList<TabInfo> tabs = new ArrayList<TabInfo>();
    private boolean tabsShown = true;
    private boolean swipeEnabled = true;

    private OnTabChangeListener onTabChangeListener;
    private OnTabFragmentCreateListener onTabFragmentCreateListener;

    public interface OnTabChangeListener {
        public void onTabChanged(int position);
    }

    public interface OnTabFragmentCreateListener {
        public void onTabFragmentCreated(Fragment fragment, int position);
    }

    static final class TabInfo {
        private final Class<?> clss;
        private final Bundle args;
        private Fragment fragment;

        TabInfo(Class<?> clss, Bundle args) {
            this.clss = clss;
            this.args = args;
            this.fragment = null;
        }
    }

    public TabAdapter(ActionBarActivity activity, ViewPager pager) {
        super(activity.getSupportFragmentManager());
        this.activity = activity;
        actionBar = activity.getSupportActionBar();
        viewPager = pager;
        viewPager.setOnPageChangeListener(this);
        viewPager.setAdapter(this);

        refreshPreferences();
    }

    public void refreshPreferences() {
        PreferenceManager prefManager = PreferenceManager.getInstance();

        String[] tabNavigationTypes = activity.getResources().getStringArray(R.array.pref_tab_navigation_values);
        String tabNavigation = prefManager.readUserStringPreference(KEY_TABNAV, "");

        int navIndex = Arrays.asList(tabNavigationTypes).indexOf(tabNavigation);

        // If no preference set, default to both
        if (navIndex == -1) {
            navIndex = 2;
        }

        tabsShown = navIndex % 2 == 0;
        swipeEnabled = navIndex > 0;

        if (tabsShown) {
            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        } else {
            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        }

        if (!swipeEnabled) {
            viewPager.setOnTouchListener(new OnTouchListener() {
                public boolean onTouch(View v, MotionEvent event) {
                    v.performClick();
                    return true;
                }
            });
        } else {
            viewPager.setOnTouchListener(null);
        }
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        Fragment fragment = (Fragment) super.instantiateItem(container, position);
        tabs.get(position).fragment = fragment;
        onTabFragmentCreateListener.onTabFragmentCreated(fragment, position);
        return fragment;
    }

    public void addTab(ActionBar.Tab tab, Class<?> clss) {
        addTab(tab, clss, null);
    }

    public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
        TabInfo info = new TabInfo(clss, args);
        tab.setTag(info);
        tab.setTabListener(this);
        tabs.add(info);
        actionBar.addTab(tab);
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return tabs.size();
    }

    @Override
    public Fragment getItem(int position) {
        TabInfo info = tabs.get(position);
        Fragment fragment = Fragment.instantiate(activity, info.clss.getName(), info.args);
        return fragment;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        super.destroyItem(container, position, object);
        tabs.get(position).fragment = null;
    }

    public Fragment getFragment(int position) {
        return tabs.get(position).fragment;
    }

    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    public void onPageSelected(int position) {
        if (tabsShown) {
            actionBar.setSelectedNavigationItem(position);
        }
        notifyTabChanged(position);
    }

    public void onPageScrollStateChanged(int state) {
    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        int position = tab.getPosition();
        viewPager.setCurrentItem(position);
        notifyTabChanged(position);
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    public void setOnTabFragmentCreateListener(OnTabFragmentCreateListener listener) {
        this.onTabFragmentCreateListener = listener;
    }

    public void setOnTabChangeListener(OnTabChangeListener listener) {
        this.onTabChangeListener = listener;
    }

    private void notifyTabChanged(int position) {
        if (onTabChangeListener != null) {
            onTabChangeListener.onTabChanged(position);
        }
    }

    public Fragment getTabFragment(int position) {
        return tabs.get(position).fragment;
    }
}