cn.edu.sdu.online.activity.FragmentTabsPager.java Source code

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/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 cn.edu.sdu.online.activity;

import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TabWidget;
import android.widget.TextView;
import android.widget.Toast;
import cn.edu.sdu.online.R;
import cn.edu.sdu.online.chatservice.ChatwithService;
import cn.edu.sdu.online.fragment.PersonFragment;
import cn.edu.sdu.online.fragment.SearchFragment;
import cn.edu.sdu.online.fragment.SquareFragment;
import cn.edu.sdu.online.fragment.SubContainer;
import cn.edu.sdu.online.share.FloatApplication;
import cn.edu.sdu.online.view.FloatView;

/**
 * Demonstrates combining a TabHost with a ViewPager to implement a tab UI that
 * switches between tabs and also allows the user to perform horizontal flicks
 * to move between the tabs.
 */
public class FragmentTabsPager extends FragmentActivity {
    TabHost mTabHost;
    ViewPager mViewPager;
    TabsAdapter mTabsAdapter;
    static TextView view1;
    //static ActionBar actionbar;
    static TextView titlea;
    View viewTitleBar;
    private ImageView messageBox;
    private WindowManager windowManager = null;
    private WindowManager.LayoutParams windowManagerParams = null;
    private FloatView floatView = null;
    private int width;
    private int height;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //setTheme(R.style.MainTheme);
        super.onCreate(savedInstanceState);
        LayoutInflater inflater = LayoutInflater.from(FragmentTabsPager.this);
        requestWindowFeature(Window.FEATURE_NO_TITLE);//??
        setContentView(R.layout.fragment_tabs_pager);
        mTabHost = (TabHost) findViewById(android.R.id.tabhost);//
        mTabHost.setup();
        View storage = inflater.inflate(R.layout.tab_storage, null);//tab bar 

        View square = inflater.inflate(R.layout.tab_square, null);
        View shake = inflater.inflate(R.layout.tab_shake, null);
        View person = inflater.inflate(R.layout.tab_personal, null);

        mViewPager = (ViewPager) findViewById(R.id.pager);
        titlea = (TextView) findViewById(R.id.title);//

        messageBox = (ImageView) findViewById(R.id.messagebox);
        messageBox.setOnClickListener(new messageBoxListener());

        mTabsAdapter = new TabsAdapter(this, mTabHost, mViewPager);//?

        mTabsAdapter.addTab(mTabHost.newTabSpec("square")//f
                .setIndicator(square), SquareFragment.class, null);
        mTabsAdapter.addTab(mTabHost.newTabSpec("shake").setIndicator(shake), SearchFragment.class, null);
        mTabsAdapter.addTab(mTabHost.newTabSpec("storage").setIndicator(storage), SubContainer.class, null);
        mTabsAdapter.addTab(mTabHost.newTabSpec("person").setIndicator(person), PersonFragment.class, null);

        new Handler().postDelayed(new Runnable() {
            public void run() {
                createView();
            }
        }, 200);

        if (savedInstanceState != null) {
            mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
        }
        DisplayMetrics metric = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metric);
        width = metric.widthPixels; // ??
        height = metric.heightPixels; // ??

    }

    protected void onResume() {
        super.onResume();
    };

    class messageBoxListener implements OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent();
            intent.setClass(FragmentTabsPager.this, MessageBox.class);
            startActivity(intent);

        }

    }

    //
    private void createView() {
        floatView = new FloatView(getApplicationContext());
        floatView.setOnClickListener(new imageviewListener());
        floatView.setImageResource(R.drawable.releasetask);
        windowManager = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
        windowManagerParams = ((FloatApplication) getApplication()).getWindowParams();
        windowManagerParams.type = LayoutParams.TYPE_PHONE;
        windowManagerParams.format = PixelFormat.RGBA_8888;
        windowManagerParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE;
        windowManagerParams.gravity = Gravity.LEFT | Gravity.TOP;

        windowManagerParams.x = 8;
        windowManagerParams.y = height - 260;
        windowManagerParams.width = LayoutParams.WRAP_CONTENT;
        windowManagerParams.height = LayoutParams.WRAP_CONTENT;
        windowManager.addView(floatView, windowManagerParams);
    }

    class imageviewListener implements OnClickListener {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent = new Intent();
            intent.setClass(FragmentTabsPager.this, PublishTaskActivity.class);
            startActivity(intent);
        }
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
        new Handler().postDelayed(new Runnable() {
            public void run() {
                windowManager.addView(floatView, windowManagerParams);//?button
            }
        }, 500);

    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        try {
            windowManager.removeView(floatView);//button
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString("tab", mTabHost.getCurrentTabTag());
    }

    /**
     * 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 TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
        private final Context mContext;
        private final TabHost mTabHost;
        private final ViewPager mViewPager;
        String TAG = "FragmentTabsPager";
        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
        String[] title = { "", "?", "?", "?" };

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

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

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

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

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

        public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager) {
            super(activity.getSupportFragmentManager());
            mContext = activity;
            mTabHost = tabHost;
            mViewPager = pager;
            mTabHost.setOnTabChangedListener(this);
            mViewPager.setAdapter(this);
            mViewPager.setOnPageChangeListener(this);

        }

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

            TabInfo info = new TabInfo(tag, clss, args);
            mTabs.add(info);
            mTabHost.addTab(tabSpec);
            notifyDataSetChanged();
        }

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

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

        @Override
        public void onTabChanged(String tabId) {

            int position = mTabHost.getCurrentTab();
            Log.v(TAG, position + "position");
            mViewPager.setCurrentItem(position);
            titlea.setText(title[position]);
        }

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

        }

        @Override
        public void onPageSelected(int position) {
            // Unfortunately when TabHost changes the current tab, it kindly
            // also takes care of putting focus on it when not in touch mode.
            // The jerk.
            // This hack tries to prevent this from pulling focus out of our
            // ViewPager.
            TabWidget widget = mTabHost.getTabWidget();
            int oldFocusability = widget.getDescendantFocusability();
            widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
            mTabHost.setCurrentTab(position);
            widget.setDescendantFocusability(oldFocusability);
            titlea.setText(title[position]);
            Log.v(TAG, position + "position");
        }

        @Override
        public void onPageScrollStateChanged(int state) {
            // System.out.println(state+"{{{{{{{{");
        }

    }

    /** 
     * ???? 
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub  
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            exitBy2Click(); //?  
        }
        return false;
    }

    /** 
     * ? 
     */
    private static Boolean isExit = false;

    private void exitBy2Click() {
        Timer tExit = null;
        if (isExit == false) {
            isExit = true; //   
            Toast.makeText(this, "??", Toast.LENGTH_SHORT).show();
            tExit = new Timer();
            tExit.schedule(new TimerTask() {
                @Override
                public void run() {
                    isExit = false; // ?  
                }
            }, 2000); // 2???  

        } else {
            finish();
        }
    }

}