org.openbmap.utils.TabManager.java Source code

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Here is the source code for org.openbmap.utils.TabManager.java

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/*
   Radiobeacon - Openbmap wifi and cell logger
Copyright (C) 2013  wish7
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.openbmap.utils;

import java.util.HashMap;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.TabHost;

/**
 * Tab Helper class from ActionBarSherlock Samples
 * This is a helper class that implements a generic mechanism for
 * associating fragments with the tabs in a tab host. It relies on a
 * trick. Normally a tab host has a simple API for supplying a View or
 * Intent that each tab will show. This is not sufficient for switching
 * between fragments. So instead we make the content part of the tab host
 * 0dp high (it is not shown) and the TabManager supplies its own dummy
 * view to show as the tab content. It listens to changes in tabs, and takes
 * care of switch to the correct fragment shown in a separate content area
 * whenever the selected tab changes.
 */
public class TabManager implements TabHost.OnTabChangeListener {
    private final FragmentActivity mActivity;
    private final TabHost mTabHost;
    private final int mContainerId;
    private final HashMap<String, TabInfo> mTabs = new HashMap<String, TabInfo>();
    TabInfo mLastTab;

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

        TabInfo(final String _tag, final Class<?> _class, final Bundle _args) {
            tag = _tag;
            clss = _class;
            args = _args;
        }
    }

    static class DummyTabFactory implements TabHost.TabContentFactory {
        private final Context mContext;

        public DummyTabFactory(final Context context) {
            mContext = context;
        }

        @Override
        public View createTabContent(final String tag) {
            final View v = new View(mContext);
            v.setMinimumWidth(0);
            v.setMinimumHeight(0);
            return v;
        }
    }

    public TabManager(final FragmentActivity activity, final TabHost tabHost, final int containerId) {
        mActivity = activity;
        mTabHost = tabHost;
        mContainerId = containerId;
        mTabHost.setOnTabChangedListener(this);
    }

    public void addTab(final TabHost.TabSpec tabSpec, final Class<?> clss, final Bundle args) {
        tabSpec.setContent(new DummyTabFactory(mActivity));
        final String tag = tabSpec.getTag();

        final TabInfo info = new TabInfo(tag, clss, args);

        // Check to see if we already have a fragment for this tab, probably
        // from a previously saved state. If so, deactivate it, because our
        // initial state is that a tab isn't shown.
        info.fragment = mActivity.getSupportFragmentManager().findFragmentByTag(tag);
        if (info.fragment != null && !info.fragment.isDetached()) {
            final FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
            ft.detach(info.fragment);
            ft.commit();
        }

        mTabs.put(tag, info);
        mTabHost.addTab(tabSpec);
    }

    @Override
    public void onTabChanged(final String tabId) {
        final TabInfo newTab = mTabs.get(tabId);
        if (mLastTab != newTab) {
            final FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
            if (mLastTab != null) {
                if (mLastTab.fragment != null) {
                    ft.detach(mLastTab.fragment);
                }
            }
            if (newTab != null) {
                if (newTab.fragment == null) {
                    newTab.fragment = Fragment.instantiate(mActivity, newTab.clss.getName(), newTab.args);
                    ft.add(mContainerId, newTab.fragment, newTab.tag);
                } else {
                    ft.attach(newTab.fragment);
                }
            }

            mLastTab = newTab;
            ft.commit();
            mActivity.getSupportFragmentManager().executePendingTransactions();
        }
    }
}