/*
* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
*
* This file is part of FileExplorer.
*
* FileExplorer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* FileExplorer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with SwiFTP. If not, see <http://www.gnu.org/licenses/>.
*/
package net.micode.fileexplorer;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v13.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.ActionMode;
import java.util.ArrayList;
public class FileExplorerTabActivity extends Activity {
private static final String INSTANCESTATE_TAB = "tab";
private static final int DEFAULT_OFFSCREEN_PAGES = 2;
ViewPager mViewPager;
TabsAdapter mTabsAdapter;
ActionMode mActionMode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_pager);
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setOffscreenPageLimit(DEFAULT_OFFSCREEN_PAGES);
final ActionBar bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE | ActionBar.DISPLAY_SHOW_HOME);
mTabsAdapter = new TabsAdapter(this, mViewPager);
mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_category),
FileCategoryActivity.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_sd),
FileViewActivity.class, null);
mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_remote),
ServerControlActivity.class, null);
bar.setSelectedNavigationItem(PreferenceManager.getDefaultSharedPreferences(this)
.getInt(INSTANCESTATE_TAB, Util.CATEGORY_TAB_INDEX));
}
@Override
protected void onPause() {
super.onPause();
SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(this).edit();
editor.putInt(INSTANCESTATE_TAB, getActionBar().getSelectedNavigationIndex());
editor.commit();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
if (getActionBar().getSelectedNavigationIndex() == Util.CATEGORY_TAB_INDEX) {
FileCategoryActivity categoryFragement =(FileCategoryActivity) mTabsAdapter.getItem(Util.CATEGORY_TAB_INDEX);
if (categoryFragement.isHomePage()) {
reInstantiateCategoryTab();
} else {
categoryFragement.setConfigurationChanged(true);
}
}
super.onConfigurationChanged(newConfig);
}
public void reInstantiateCategoryTab() {
mTabsAdapter.destroyItem(mViewPager, Util.CATEGORY_TAB_INDEX,
mTabsAdapter.getItem(Util.CATEGORY_TAB_INDEX));
mTabsAdapter.instantiateItem(mViewPager, Util.CATEGORY_TAB_INDEX);
}
@Override
public void onBackPressed() {
IBackPressedListener backPressedListener = (IBackPressedListener) mTabsAdapter
.getItem(mViewPager.getCurrentItem());
if (!backPressedListener.onBack()) {
super.onBackPressed();
}
}
public interface IBackPressedListener {
/**
* 处理back事件。
* @return True: 表示已经处理; False: 没有处理，让基类处理。
*/
boolean onBack();
}
public void setActionMode(ActionMode actionMode) {
mActionMode = actionMode;
}
public ActionMode getActionMode() {
return mActionMode;
}
public Fragment getFragment(int tabIndex) {
return mTabsAdapter.getItem(tabIndex);
}
/**
* This is a helper class that implements the management of tabs and all
* details of connecting a ViewPager with associated TabHost. 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 pages. So instead we make the content part of the tab host
* 0dp high (it is not shown) and the TabsAdapter 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 paged in the ViewPager whenever the selected
* tab changes.
*/
public static class TabsAdapter extends FragmentPagerAdapter
implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo {
private final Class<?> clss;
private final Bundle args;
private Fragment fragment;
TabInfo(Class<?> _class, Bundle _args) {
clss = _class;
args = _args;
}
}
public TabsAdapter(Activity activity, ViewPager pager) {
super(activity.getFragmentManager());
mContext = activity;
mActionBar = activity.getActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
TabInfo info = new TabInfo(clss, args);
tab.setTag(info);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mTabs.size();
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
if (info.fragment == null) {
info.fragment = Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
return info.fragment;
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
Object tag = tab.getTag();
for (int i=0; i<mTabs.size(); i++) {
if (mTabs.get(i) == tag) {
mViewPager.setCurrentItem(i);
}
}
if(!tab.getText().equals(mContext.getString(R.string.tab_sd))) {
ActionMode actionMode = ((FileExplorerTabActivity) mContext).getActionMode();
if (actionMode != null) {
actionMode.finish();
}
}
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
}