viewpager 实现tab-----(viewpager + fragmentpageradapter)

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/*
 * 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 com.android.fileexplorer;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources.Theme;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.support.v13.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.ActionMode;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;

public class FileExplorerTabActivity extends Activity implements
        OnClickListener {
    private static final String INSTANCESTATE_TAB = "tab";
    private static final int DEFAULT_OFFSCREEN_PAGES = 2;
    LinearLayout mActionBarView;
    TextView category, list, control;
    ViewPager mViewPager;
    // TabsAdapter mTabsAdapter;
    FragAdapter mFragAdapter;
    ActionMode mActionMode;
    List<Fragment> fragments = new ArrayList<Fragment>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTheme(R.style.AppBaseTheme);
        setContentView(R.layout.fragment_pager);
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setOffscreenPageLimit(DEFAULT_OFFSCREEN_PAGES);

        /* PRIZE-Support ImmersiveMode-liguizeng-2015-4-9-start */
        getWindow().setStatusBarColor(Color.parseColor("#394652"));
        getWindow().addFlags(
                WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);

        // int visibility = getWindow().getDecorView().getVisibility();
        // getWindow().getDecorView().setSystemUiVisibility(visibility^View.SYSTEM_UI_FLAG_LAYOUT_STABLE
        // | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        // | View.SYSTEM_UI_FLAG_FULLSCREEN
        // | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
        // getActionBar().show();
        /* PRIZE-Support ImmersiveMode-liguizeng-2015-4-9-end */

        final ActionBar bar = getActionBar();
        // bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE
                | ActionBar.DISPLAY_SHOW_HOME);
        bar.setCustomView(R.layout.fileexplorer_actionbar);
        bar.setDisplayShowCustomEnabled(true);
        mActionBarView = (LinearLayout) bar.getCustomView();
        category = (TextView) mActionBarView.findViewById(R.id.title_category);
        category.setOnClickListener(this);
        list = (TextView) mActionBarView.findViewById(R.id.title_listview);
        list.setOnClickListener(this);
        control = (TextView) mActionBarView.findViewById(R.id.title_control);
        control.setOnClickListener(this);
        Intent service = new Intent(this, FileExplorerService.class);
        getApplicationContext().bindService(service, sc,
                Service.BIND_AUTO_CREATE);
        // mTabsAdapter = new TabsAdapter(this, mViewPager);
        // Tab category, sd, remote;
        // category = bar.newTab().setText(R.string.tab_category);
        // sd = bar.newTab().setText(R.string.tab_sd);
        // remote = bar.newTab().setText(R.string.tab_remote);
        mFragAdapter = new FragAdapter(getFragmentManager(), fragments);
        fragments.add(new FileCategoryActivity());
        fragments.add(new FileViewActivity());
        fragments.add(new ServerControlActivity());
        mViewPager.setAdapter(mFragAdapter);
        mViewPager.setOnPageChangeListener(mFragAdapter);
        mViewPager.setCurrentItem(0);
        mFragAdapter.onPageSelected(0);
        // mTabsAdapter.addTab(category, FileCategoryActivity.class, null);
        // mTabsAdapter.addTab(sd, FileViewActivity.class, null);
        // mTabsAdapter.addTab(remote, ServerControlActivity.class, null);
        // bar.setSelectedNavigationItem(PreferenceManager.getDefaultSharedPreferences(this)
        // .getInt(INSTANCESTATE_TAB, Util.CATEGORY_TAB_INDEX));
        // bar.setSelectedNavigationItem(0);
        // mViewPager.setAdapter(new TabsAdapter(getFragmentManager()));
        // tabs.setViewPager(mViewPager);
        // setTabsValue();
    }

    private FileExplorerService serviceBinder;

    private ServiceConnection sc = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {
            serviceBinder = null;
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            serviceBinder = ((FileExplorerService.MyBinder) service)
                    .getService();
            FileOperationHelper.setService(serviceBinder);
            setService(serviceBinder);
        }
    };

    public FileExplorerService getService() {
        return serviceBinder;
    }

    protected void setService(FileExplorerService service) {

    }

    /*
     * private void setTabsValue() {
     * 
     * // TODO Auto-generated method stub
     * mTabsAdapter.setSelectedTextColor(Color.parseColor("#45c01a")); }
     */
    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
    }

    @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 (mViewPager.getCurrentItem() == Util.CATEGORY_TAB_INDEX) {
            FileCategoryActivity categoryFragement = (FileCategoryActivity) mFragAdapter
                    .getItem(Util.CATEGORY_TAB_INDEX);
            if (categoryFragement.isHomePage()) {
                reInstantiateCategoryTab();
            } else {
                categoryFragement.setConfigurationChanged(true);
            }
        }
        super.onConfigurationChanged(newConfig);
    }

    public void reInstantiateCategoryTab() {
        mFragAdapter.destroyItem(mViewPager, Util.CATEGORY_TAB_INDEX,
                mFragAdapter.getItem(Util.CATEGORY_TAB_INDEX));
        mFragAdapter.instantiateItem(mViewPager, Util.CATEGORY_TAB_INDEX);
    }

    @Override
    public void onBackPressed() {
        IBackPressedListener backPressedListener = (IBackPressedListener) mFragAdapter
                .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 mFragAdapter.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) {
        }

    }*/

    public class FragAdapter extends FragmentPagerAdapter implements 
                        ViewPager.OnPageChangeListener {

        private List<Fragment> fragments;

        public FragAdapter(FragmentManager fm) {
            super(fm);
        }

        public FragAdapter(FragmentManager fm, List<Fragment> fragments) {
            super(fm);
            this.fragments = fragments;
        }

        @Override
        public Fragment getItem(int position) {
            return fragments.get(position);
        }

        @Override
        public int getCount() {
            return fragments.size();
        }
        
        @Override
        public void onPageScrolled(int position, float positionOffset,
                int positionOffsetPixels) {
        }

        @Override
        public void onPageSelected(int position) {
            
            switch (position) {
            case 0:
                category.setTextColor(Color.WHITE);
                list.setTextColor(Color.GRAY);
                control.setTextColor(Color.GRAY);
                break;
            case 1:
                category.setTextColor(Color.GRAY);
                list.setTextColor(Color.WHITE);
                control.setTextColor(Color.GRAY);
                break;
            case 2:
                category.setTextColor(Color.GRAY);
                list.setTextColor(Color.GRAY);
                control.setTextColor(Color.WHITE);
                break;
            default:
                break;
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    }

    @Override
    protected void onDestroy() {
        getApplicationContext().unbindService(sc);
        super.onDestroy();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.title_category:
            mViewPager.setCurrentItem(0);
            break;
        case R.id.title_listview:
            mViewPager.setCurrentItem(1);
            ActionMode actionMode = getActionMode();
            if (actionMode != null) {
                actionMode.finish();
            }
            break;
        case R.id.title_control:
            mViewPager.setCurrentItem(2);
            break;
        default:
            break;
        }
    }
    public void setCurrentPage(int index) {
        if (mViewPager != null) {
            mViewPager.setCurrentItem(index);
        }
    }

    public int getCurrentPage() {
        if (mViewPager != null) {
            mViewPager.getCurrentItem();
        }
        return 0;
    }
}