eu.trentorise.smartcampus.jp.custom.TabListener.java Source code

Introduction

Here is the source code for eu.trentorise.smartcampus.jp.custom.TabListener.java

Source

/*******************************************************************************
 * Copyright 2012-2013 Trento RISE
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *        http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either   express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package eu.trentorise.smartcampus.jp.custom;

import android.app.FragmentManager;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.SherlockFragment;
import com.actionbarsherlock.app.SherlockFragmentActivity;

import eu.trentorise.smartcampus.jp.Config;

public class TabListener<T extends Fragment> implements ActionBar.TabListener {
    private Fragment mFragment;
    private final SherlockFragmentActivity mActivity;
    private final String mTag;
    private final Class<T> mClass;
    private int mViewGroup = android.R.id.content;

    /**
     * Constructor used each time a new tab is created.
     * 
     * @param activity
     *            The host Activity, used to instantiate the fragment
     * @param tag
     *            The identifier tag for the fragment
     * @param clz
     *            The fragment's Class, used to instantiate the fragment
     */
    public TabListener(SherlockFragmentActivity activity, String tag, Class<T> clz, Integer viewGroup) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
        if (viewGroup != null) {
            mViewGroup = viewGroup;
        }
    }

    /* The following are each of the ActionBar.TabListener callbacks */

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        Fragment preInitializedFragment = mActivity.getSupportFragmentManager().findFragmentByTag(mTag);
        if (preInitializedFragment != null && !preInitializedFragment.equals(mFragment)) {
            ft.remove(preInitializedFragment);
        }

        if (mFragment == null) {
            // If not, instantiate and add it to the activity
            mFragment = Fragment.instantiate(mActivity, mClass.getName(),
                    tab.getTag() != null ? (Bundle) tab.getTag() : null);
            ft.add(android.R.id.content, mFragment, mTag);
            //         ft.replace(android.R.id.content, mFragment);

        } else {
            // If it exists, simply attach it in order to show it
            ft.attach(mFragment);
        }

        // SherlockFragment preInitializedFragment = (SherlockFragment)
        // mActivity.getSupportFragmentManager()
        // .findFragmentByTag(mTag);
        //
        // if (mFragment == null && preInitializedFragment == null) {
        // mFragment = (SherlockFragment)
        // SherlockFragment.instantiate(mActivity, mClass.getName());
        // ft.add(mViewGroup, mFragment, mTag);
        // } else if (mFragment != null) {
        // // If it exists, simply attach it in order to show it
        // ft.attach(mFragment);
        // } else if (preInitializedFragment != null) {
        // mFragment = preInitializedFragment;
        // ft.attach(mFragment);
        //
        // }
        // // Check if the fragment is already initialized
        // if (mFragment == null) {
        // // If not, instantiate and add it to the activity
        // mFragment = Fragment.instantiate(mActivity, mClass.getName());
        // ft.add(mViewGroup, mFragment, mTag);
        // } else {
        // // If it exists, simply attach it in order to show it
        // ft.attach(mFragment);
        // }

    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // if (mFragment != null) {
        // // Detach the fragment, because another one is being attached
        // ft.detach(mFragment);
        // }
        mActivity.getSupportFragmentManager().popBackStack(mTag, FragmentManager.POP_BACK_STACK_INCLUSIVE);
        if (mFragment != null) {
            // Detach the fragment, because another one is being attached
            ft.detach(mFragment);
        }
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        // User selected the already selected tab. Usually do nothing.
    }
}