NewsApp03

作者: GeekGray | 来源:发表于2018-10-03 19:41 被阅读4次

顶部新闻轮播图事件处理

重写dispatchTouchEvent，并且要在按下的时候

getParent().requestDisallowInterceptTouchEvent(true);

判断滑动方向，在X轴和Y轴滑动的绝对值谁大就是在什么方向滑动

一，竖直方向滑动

getParent().requestDisallowInterceptTouchEvent(false);

二，水平方向滑动

2.1，当滑动到ViewPager的第0个页面，并且是从左到右滑动

getParent().requestDisallowInterceptTouchEvent(false);

2.2，当滑动到ViewPager的最后一个页面，并且是从右到左滑动

getParent().requestDisallowInterceptTouchEvent(false);

2.3，其他

getParent().requestDisallowInterceptTouchEvent(true);

自定义HorizontalScrollViewPager

/**
 * @author: Hashub
 * @WeChat: NGSHMVP
 * @Date: 2018/9/9 18:46
 * @function:水平方向滑动的ViewPager
 */
public class HorizontalScrollViewPager extends ViewPager
{
    /**
     * 起始坐标
     */
    private float startX;
    private float startY;

    public HorizontalScrollViewPager(Context context)
    {
        super(context);
    }

    public HorizontalScrollViewPager(Context context, AttributeSet attrs)
    {
        super(context, attrs);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev)
    {
        switch (ev.getAction())
        {
            case MotionEvent.ACTION_DOWN:
                //请求父层视图不拦截，当前控件的事件
                getParent().requestDisallowInterceptTouchEvent(true);//都把事件传给当前控件（HorizontalScrollViewPager）
                //1.记录起始坐标
                startX = ev.getX();
                startY = ev.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                //2.来到新的坐标
                float endX = ev.getX();
                float endY = ev.getY();
                //3.计算偏移量
                float distanceX = endX - startX;
                float distanceY = endY - startY;
                //4.判断滑动方向
                if (Math.abs(distanceX) > Math.abs(distanceY))
                {
                    //水平方向滑动
                   //2.1，当滑动到ViewPager的第0个页面，并且是从左到右滑动
                    //getParent().requestDisallowInterceptTouchEvent(false);
                    if (getCurrentItem() == 0 && distanceX > 0)
                    {
                        getParent().requestDisallowInterceptTouchEvent(false);
                    }

                  //2.2，当滑动到ViewPager的最后一个页面，并且是从右到左滑动
                   // getParent().requestDisallowInterceptTouchEvent(false);
                    else if ((getCurrentItem() == (getAdapter().getCount() - 1)) && distanceX < 0)
                    {
                        getParent().requestDisallowInterceptTouchEvent(false);
                    }
                  //2.3，其他,中间部分
                  //getParent().requestDisallowInterceptTouchEvent(true);
                    else
                    {
                        getParent().requestDisallowInterceptTouchEvent(true);
                    }
                }
                else
                {
                    //竖直方向滑动
                    getParent().requestDisallowInterceptTouchEvent(false);
                }
                break;
            case MotionEvent.ACTION_UP:
                break;
            default:
                break; 
        }
        return super.dispatchTouchEvent(ev);
    }
}

自定义下拉刷新(touch事件处理

1.自定义Listview实现下拉刷新，RefreshListview,必须重新带有两个参数的构造方法

2.在构造方法里面，把下拉刷新控件添加

自定义ProgressBar

3.下拉刷新控件隐藏和显示的原理

View.setPadding(0,-控件高，0,0);//完全隐藏

View.setPadding(0,0，0,0);//完全显示

View.setPadding(0,控件高，0,0);//2倍高显示

4.拖动实现隐藏和显示下拉刷新控件

  a,重写onTouchEvent()
    在down startY;
  b,计算滑动的距离
   float distanceY = endY - startY;

   int paddingTop = -控件高 + distanceY;
   View.setPadding(0,paddingTop，0,0);//动态的显示下拉刷新控件

  c，设置效果

刷新的效果的实现

1.定义刷新的三个状态

 /**
 * 下拉刷新控件的高
 */
private int pullDownRefreshHeight;

/**
 下拉刷新
 */
public static final int PULL_DOWN_REFRESH = 0;

/**
 手松刷新
 */
public static final int RELEASE_REFRESH = 1;


/**
 正在刷新
 */
public static final int REFRESHING = 2;


/**
 * 当前状态
 */
private int currentStatus = PULL_DOWN_REFRESH;

自定义下拉刷新RefreshListview

/**
 * @author: Hashub
 * @WeChat: NGSHMVP
 * @Date: 2018/9/6 19:37
 * @function:自定义下拉刷新
 */
public class RefreshListview extends ListView
{
    /**
     * 下拉刷新和顶部轮播图
     */
    private LinearLayout headerView;

    /**
     * 下拉刷新控件
     */
    private View ll_pull_down_refresh;
    private ImageView iv_arrow;
    private ProgressBar pb_status;
    private TextView tv_status;
    private TextView tv_time;
    /**
     * 下拉刷新控件的高
     */
    private int pullDownRefreshHeight;

    /**
     * 下拉刷新
     */
    public static final int PULL_DOWN_REFRESH = 0;

    /**
     * 手松刷新
     */
    public static final int RELEASE_REFRESH = 1;


    /**
     * 正在刷新
     */
    public static final int REFRESHING = 2;


    /**
     * 当前状态
     */
    private int currentStatus = PULL_DOWN_REFRESH;

    private Animation upAnimation;
    private Animation downAnimation;
    /**
     * 加载更多的控件
     */
    private View footerView;
    /**
     * 加载更多控件高
     */
    private int footerViewHeight;
    /**
     * 是否已经加载更多
     */
    private boolean isLoadMore = false;
    /**
     * 顶部轮播图部分
     */
    private View topNewsView;
    /**
     * ListView在Y轴上的坐标
     */
    private int listViewOnScreenY = -1;


    public RefreshListview(Context context)
    {
        this(context, null);
    }

    public RefreshListview(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public RefreshListview(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
        initHeaderView(context);
        initAnimation();
        initFooterView(context);

    }

    private void initFooterView(Context context)
    {
        footerView = View.inflate(context, R.layout.refresh_footer, null);
        footerView.measure(0, 0);
        footerViewHeight = footerView.getMeasuredHeight();


        footerView.setPadding(0, -footerViewHeight, 0, 0);

        //ListView添加footer
        addFooterView(footerView);


        //监听ListView的滚动
        setOnScrollListener(new MyOnScrollListener());
    }

    /**
     * 添加顶部轮播图
     *
     * @param topNewsView
     */
    public void addTopNewsView(View topNewsView)
    {
        if (topNewsView != null)
        {
            this.topNewsView = topNewsView;
            headerView.addView(topNewsView);
        }


    }

    class MyOnScrollListener implements OnScrollListener
    {

        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState)
        {
            //当静止或者惯性滚动的时候
            if (scrollState == OnScrollListener.SCROLL_STATE_IDLE || scrollState == OnScrollListener.SCROLL_STATE_FLING)
            {
                //并且是最后一条可见
                if (getLastVisiblePosition() >= getCount() - 1)
                {

                    //1.显示加载更多布局
                    footerView.setPadding(8, 8, 8, 8);
                    //2.状态改变
                    isLoadMore = true;
                    //3.回调接口
                    if (mOnRefreshListener != null)
                    {
                        mOnRefreshListener.onLoadMore();
                    }
                }
            }


        }

        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
        {

        }
    }


    private void initAnimation()
    {
        upAnimation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        upAnimation.setDuration(500);
        upAnimation.setFillAfter(true);

        downAnimation = new RotateAnimation(-180, -360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        downAnimation.setDuration(500);
        downAnimation.setFillAfter(true);
    }

    private void initHeaderView(Context context)
    {
        headerView = (LinearLayout) View.inflate(context, R.layout.refresh_header, null);
        //下拉刷新控件
        ll_pull_down_refresh = headerView.findViewById(R.id.ll_pull_down_refresh);
        iv_arrow = (ImageView) headerView.findViewById(R.id.iv_arrow);
        pb_status = (ProgressBar) headerView.findViewById(R.id.pb_status);
        tv_status = (TextView) headerView.findViewById(R.id.tv_status);
        tv_time = (TextView) headerView.findViewById(R.id.tv_time);

        //测量
        ll_pull_down_refresh.measure(0, 0);
        pullDownRefreshHeight = ll_pull_down_refresh.getMeasuredHeight();

        //默认隐藏下拉刷新控件
        // View.setPadding(0,-控件高，0,0);//完全隐藏
        //View.setPadding(0, 0，0,0);//完全显示
        ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0);

        //添加ListView的头
        addHeaderView(headerView);
    }

    private float startY = -1;

    @Override
    public boolean onTouchEvent(MotionEvent ev)
    {
        switch (ev.getAction())
        {
            case MotionEvent.ACTION_DOWN:
                //1.记录起始坐标
                startY = ev.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                if (startY == -1)
                {
                    startY = ev.getY();
                }

                //判断顶部轮播图是否完全显示，只有完全显示才会有下拉刷新

                boolean isDisplayTopNews = isDisplayTopNews();
                if (!isDisplayTopNews)
                {
                    //加载更多
                    break;
                }


                //如果是正在刷新，就不让再刷新了
                if (currentStatus == REFRESHING)
                {
                    break;
                }
                //2.来到新的坐标
                float endY = ev.getY();
                //3.记录滑动的距离
                float distanceY = endY - startY;
                if (distanceY > 0)
                {//下拉

                    //int paddingTop = -控件高 + distanceY;
                    int paddingTop = (int) (-pullDownRefreshHeight + distanceY);

                    if (paddingTop < 0 && currentStatus != PULL_DOWN_REFRESH)
                    {
                        //下拉刷新状态
                        currentStatus = PULL_DOWN_REFRESH;
                        //更新状态
                        refreshViewState();

                    }
                    else if (paddingTop > 0 && currentStatus != RELEASE_REFRESH)
                    {
                        //手松刷新状态
                        currentStatus = RELEASE_REFRESH;
                        //更新状态
                        refreshViewState();

                    }

                    ll_pull_down_refresh.setPadding(0, paddingTop, 0, 0);
                    //View.setPadding(0,paddingTop，0,0);//动态的显示下拉刷新控件
                }
                break;
            case MotionEvent.ACTION_UP:
                startY = -1;
                if (currentStatus == PULL_DOWN_REFRESH)
                {
//                    View.setPadding(0,-控件高，0,0);//完全隐藏
                    ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0);
                }
                else if (currentStatus == RELEASE_REFRESH)
                {
                    //设置状态为正在刷新
                    currentStatus = REFRESHING;

                    refreshViewState();

//                    View.setPadding(0,0，0,0);//完全显示
                    ll_pull_down_refresh.setPadding(0, 0, 0, 0);


                    //回调接口
                    if (mOnRefreshListener != null)
                    {
                        mOnRefreshListener.onPullDownRefresh();
                    }
                }
                break;

        }
        return super.onTouchEvent(ev);
    }

    /**
     * 判断是否完全显示顶部轮播图
     * 当ListView在屏幕上的Y轴坐标小于或者等于顶部轮播图在Y轴的坐标的时候，顶部轮播图完全显示
     *
     * @return
     */
    private boolean isDisplayTopNews()
    {

        if (topNewsView != null)
        {
            //1.得到ListView在屏幕上的坐标
            int[] location = new int[2];
            if (listViewOnScreenY == -1)
            {
                getLocationOnScreen(location);
                listViewOnScreenY = location[1];
            }

            //2.得到顶部轮播图在屏幕上的坐标
            topNewsView.getLocationOnScreen(location);
            int topNewsViewOnScreenY = location[1];

//        if(listViewOnScreenY <= topNewsViewOnScreenY){
//            return true;
//        }else{
//            return false;
//        }

            return listViewOnScreenY <= topNewsViewOnScreenY;
        }
        else
        {
            return true;
        }

    }

    private void refreshViewState()
    {

        switch (currentStatus)
        {
            case PULL_DOWN_REFRESH://下拉刷新状态
                iv_arrow.startAnimation(downAnimation);
                tv_status.setText("下拉刷新...");
                break;

            case RELEASE_REFRESH://手松刷新状态
                iv_arrow.startAnimation(upAnimation);
                tv_status.setText("手松刷新...");
                break;
            case REFRESHING://正在刷新状态
                tv_status.setText("正在刷新...");
                pb_status.setVisibility(VISIBLE);
                iv_arrow.clearAnimation();
                iv_arrow.setVisibility(GONE);
                break;
        }

    }

    /**
     * 当联网成功和失败的时候回调该方法
     * 用户刷新状态的还原
     *
     * @param sucess
     */
    public void onRefreshFinish(boolean sucess)
    {
        if (isLoadMore)
        {
            //加载更多
            isLoadMore = false;
            //隐藏加载更多布局
            footerView.setPadding(0, -footerViewHeight, 0, 0);
        }
        else
        {
            //下拉刷新
            tv_status.setText("下拉刷新...");
            currentStatus = PULL_DOWN_REFRESH;
            iv_arrow.clearAnimation();
            pb_status.setVisibility(GONE);
            iv_arrow.setVisibility(VISIBLE);
            //隐藏下拉刷新控件
            ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0);
            if (sucess)
            {
                //设置最新更新时间
                tv_time.setText("上次更新时间：" + getSystemTime());
            }
        }


    }

    /**
     * 得到当前Android系统的时间
     *
     * @return
     */
    private String getSystemTime()
    {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return format.format(new Date());
    }


    /**
     * 监听控件的刷新
     */
    public interface OnRefreshListener
    {

        /**
         * 当下拉刷新的时候回调这个方法
         */
        public void onPullDownRefresh();

        /**
         * 当加载更多的时候回调这个方法
         */
        public void onLoadMore();

    }

    private OnRefreshListener mOnRefreshListener;


    /**
     * 设置监听刷新，由外界设置
     */
    public void setOnRefreshListener(OnRefreshListener l)
    {
        this.mOnRefreshListener = l;

    }
}

PullToRefresh下拉刷新的使用

1.下载

https://github.com/chrisbanes/Android-PullToRefresh

2.导入运行PullToRefresh案例

3.参照案例，关联库

4.专题页面也实现了新闻详情页面的效果

5.使用PullToRefresh

加载布局，且PullRefreshListView.getRefreshableView();得到返回值为ListView类型

 @Override
    public View initView()
    {
        View view = View.inflate(context, R.layout.topic_detail_pager, null);


        mPullRefreshListView = (PullToRefreshListView) view.findViewById(R.id.pull_refresh_list);

        listview = mPullRefreshListView.getRefreshableView();

        /**
         * Add Sound Event Listener
         */
        SoundPullEventListener<ListView> soundListener = new SoundPullEventListener<ListView>(context);
        soundListener.addSoundEvent(PullToRefreshBase.State.PULL_TO_REFRESH, R.raw.pull_event);
        soundListener.addSoundEvent(PullToRefreshBase.State.RESET, R.raw.reset_sound);
        soundListener.addSoundEvent(PullToRefreshBase.State.REFRESHING, R.raw.refreshing_sound);
        mPullRefreshListView.setOnPullEventListener(soundListener);


        View topNewsView = View.inflate(context, R.layout.topnews, null);
        viewpager = (HorizontalScrollViewPager) topNewsView.findViewById(R.id.viewpager);
        tv_title = (TextView) topNewsView.findViewById(R.id.tv_title);
        ll_point_group = (LinearLayout) topNewsView.findViewById(R.id.ll_point_group);

        //把顶部轮播图部分视图，以头的方式添加到ListView中
        listview.addHeaderView(topNewsView);

//        listview.addTopNewsView(topNewsView);

        //设置监听下拉刷新
//        listview.setOnRefreshListener(new MyOnRefreshListener());
        mPullRefreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>()
        {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView)
            {
                getDataFromNet();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView)
            {
                if (TextUtils.isEmpty(moreUrl))
                {
                    //没有更多数据
                    Toast.makeText(context, "没有更多数据", Toast.LENGTH_SHORT).show();
//                    listview.onRefreshFinish(false);
                    mPullRefreshListView.onRefreshComplete();
                }
                else
                {
                    getMoreDataFromNet();
                }
            }
        });

        return view;
    }

设置ListView的item的点击监听

 class MyOnItemClickListener implements AdapterView.OnItemClickListener
    {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id)
        {

            int realPosition = position - 1;
            TabDetailPagerBean.DataEntity.NewsData newsData = news.get(realPosition);
//            Toast.makeText(context, "newsData==id=="+newsData.getId()+",newsData_title=="+newsData.getTitle(), Toast.LENGTH_SHORT).show();

            LogUtil.e("newsData==id==" + newsData.getId() + ",newsData_title==" + newsData.getTitle() + ",url===" + newsData.getUrl());
            //1,取出保存的id集合
            String idArray = CacheUtils.getString(context, READ_ARRAY_ID);//"3511,"
            //2，判断是否存在，如果不存在，才保存，并且刷新适配器
            if (!idArray.contains(newsData.getId() + ""))
            {//3512

                CacheUtils.putString(context, READ_ARRAY_ID, idArray + newsData.getId() + ",");//"3511,3512,"

                //刷新适配器
                adapter.notifyDataSetChanged();//getCount-->getView

            }

            //跳转到新闻浏览页面
            Intent intent = new Intent(context, NewsDetailActivity.class);
            intent.putExtra("url", Constants.BASE_URL + newsData.getUrl());
            context.startActivity(intent);


        }
    }

设置点击过的listview的item条目文字标题变灰色

//在ListView的适配器TabDetailPagerListAdapter的getView方法中

  String idArray = CacheUtils.getString(context, READ_ARRAY_ID);
            if (idArray.contains(newsData.getId() + ""))
            {
                //设置灰色
                viewHolder.tv_title.setTextColor(Color.GRAY);
            }
            else
            {
                //设置黑色
                viewHolder.tv_title.setTextColor(Color.BLACK);
            }

TabLayout的使用

TabLayout原生的用法

参照网址：

https://segmentfault.com/a/1190000003500271

1.关联库

compile 'com.android.support:design:23.3.0'

2.布局写上TabLayout

                 <android.support.design.widget.TabLayout
                  android:id="@+id/tabLayout"
                  android:layout_width="0dp"
                  android:layout_height="wrap_content"
                  android:layout_gravity="center_vertical"
                  android:layout_weight="1" />

3.实例化

@ViewInject(R.id.tablayout)
private TabLayout tabLayout;

4.TabLayout和ViewPager关联

   tabLayout.setupWithViewPager(viewPager);
    //注意以后监听页面的变化 ，TabPageIndicator监听页面的变化

    viewPager.addOnPageChangeListener(new MyOnPageChangeListener());
    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);

5.适配器中重写getPageTitle方法

 class MyNewsMenuDetailPagerAdapter extends PagerAdapter {

        @Override
        public CharSequence getPageTitle(int position) {
            return children.get(position).getTitle();
        }

       .....
    }

6.解决TabLayout和ViewPagerIndicator的兼容问题

 <activity
        android:name=".activity.MainActivity"
        android:theme="@style/Theme.PageIndicatorDefaults" />

6.2 ViewPagerIndicator库修改成如下

<style name="Theme.PageIndicatorDefaults" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="vpiIconPageIndicatorStyle">@style/Widget.IconPageIndicator</item>
    <item name="vpiTabPageIndicatorStyle">@style/Widget.TabPageIndicator</item>
</style>

6.3添加V7包

 compile 'com.android.support:appcompat-v7:23.3.0'

TabLayout设置指针颜色和高度&文字颜色

1.添加样式

      <android.support.design.widget.TabLayout
            android:id="@+id/tabLayout"
            android:layout_width="wrap_content"
            style="@style/MyCustomTabLayout"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

values目录下styles.xml里面

 MyCustomTabLayout样式

   <style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
 
         <item name="tabMaxWidth">72dp</item>
         <item name="tabMinWidth">72dp</item>
         <item name="tabIndicatorColor">#ff0000</item>
         <item name="tabIndicatorHeight">2dp</item>
         <item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
         <item name="tabSelectedTextColor">@android:color/holo_red_light</item>
 
     </style>
 
     <style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
         <item name="android:textSize">16sp</item>
         <item name="android:textColor">@android:color/black</item>
         <item name="textAllCaps">false</item>
     </style>

TabLayout自定义样式

1.设置的样式

vp_news_menu_detailpager.setAdapter(adapter);


    //6.关联ViewPager,TabPageIndicator才可以显示

    tabLayout.setupWithViewPager(vp_news_menu_detailpager);

    //设置滚动模式

    tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
    //设置页面的监听需要用TabPageIndicator

    
    for (int i = 0; i < tabLayout.getTabCount(); i++) {
        TabLayout.Tab tab = tabLayout.getTabAt(i);
        tab.setCustomView(getTabView(i));
    }



    注意了setupWithViewPager必须在ViewPager.setAdapter()之后调用

//自定义Tab

2.在适配器中添加getTabView()方法

  public View getTabView(int position){
    View view = LayoutInflater.from(context).inflate(R.layout.tab_item, null);
    TextView tv= (TextView) view.findViewById(R.id.textView);
    tv.setText(childrenDatas.get(position).getTitle());
    ImageView img = (ImageView) view.findViewById(R.id.imageView);
    img.setImageResource(R.drawable.dot_focus);
    return view;
  }



 布局文件tab_item.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center_horizontal"
    android:orientation="vertical">


    <TextView
        android:text="text"
        android:id="@+id/textView"
        android:textColor="#000000"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="3dp" />

    <ImageView
        android:src="@drawable/dot_focus"
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true" />

</LinearLayout>

NewsDetailActivity

/**
 * @author: Hashub
 * @WeChat: NGSHMVP
 * @Date: 2018/9/5 16:37
 * @function:新闻浏览页面
 */
public class NewsDetailActivity extends Activity implements View.OnClickListener
{

    private TextView tvTitle;
    private ImageButton ibMenu;
    private ImageButton ibBack;
    private ImageButton ibTextsize;
    private ImageButton ibShare;

    private WebView webview;
    private ProgressBar pbLoading;
    private String url;
    private WebSettings webSettings;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_news_detail);
        findViews();
        getData();
    }
    /**
     * Find the Views in the layout<br />
     * <br />
     * Auto-created on 2016-08-24 09:43:47 by Android Layout Finder
     * (http://www.buzzingandroid.com/tools/android-layout-finder)
     */
    private void findViews()
    {
        tvTitle = (TextView) findViewById(R.id.tv_title);
        ibMenu = (ImageButton) findViewById(R.id.ib_menu);
        ibBack = (ImageButton) findViewById(R.id.ib_back);
        ibTextsize = (ImageButton) findViewById(R.id.ib_textsize);
        ibShare = (ImageButton) findViewById(R.id.ib_share);
        webview = (WebView) findViewById(R.id.webview);
        pbLoading = (ProgressBar) findViewById(R.id.pb_loading);

        tvTitle.setVisibility(View.GONE);
        ibMenu.setVisibility(View.GONE);
        ibBack.setVisibility(View.VISIBLE);
        ibTextsize.setVisibility(View.VISIBLE);
        ibShare.setVisibility(View.VISIBLE);

        ibBack.setOnClickListener(this);
        ibTextsize.setOnClickListener(this);
        ibShare.setOnClickListener(this);
    }

    /**
     * Handle button click events<br />
     * <br />
     * Auto-created on 2016-08-24 09:43:47 by Android Layout Finder
     * (http://www.buzzingandroid.com/tools/android-layout-finder)
     */
    @Override
    public void onClick(View v)
    {
        if (v == ibBack)
        {
            // Handle clicks for ibBack
            finish();
        }
        else if (v == ibTextsize)
        {
            // Handle clicks for ibTextsize
//            Toast.makeText(NewsDetailActivity.this, "设置文字大小", Toast.LENGTH_SHORT).show();
            showChangeTextSizeDialog();
        }
        else if (v == ibShare)
        {
            // Handle clicks for ibShare
//            Toast.makeText(NewsDetailActivity.this, "分享", Toast.LENGTH_SHORT).show();
            //showShare();
        }
    }

    private int tempSize = 2;
    private int realSize = tempSize;

    private void showChangeTextSizeDialog()
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("设置文字大小");
        String[] items = {"超大字体", "大字体", "正常字体", "小字体", "超小字体"};
        builder.setSingleChoiceItems(items, realSize, new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                tempSize = which;
            }
        });
        builder.setNegativeButton("取消", null);
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {

                realSize = tempSize;
                changeTextSize(realSize);
            }
        });
        builder.show();

    }

    private void changeTextSize(int realSize)
    {
        switch (realSize)
        {
            case 0://超大字体
                webSettings.setTextZoom(200);
                break;
            case 1://大字体
                webSettings.setTextZoom(150);
                break;
            case 2://正常字体
                webSettings.setTextZoom(100);
                break;
            case 3://小字体
                webSettings.setTextZoom(75);
                break;
            case 4://超小字体
                webSettings.setTextZoom(50);
                break;
        }

    }

    private void getData()
    {
        url = getIntent().getStringExtra("url");

        //设置支持javaScript
        webSettings = webview.getSettings();
        //设置支持javaScript
        webSettings.setJavaScriptEnabled(true);
        //设置双击变大变小
        webSettings.setUseWideViewPort(true);
        //增加缩放按钮
        webSettings.setBuiltInZoomControls(true);
        //设置文字大小
//        webSettings.setTextSize(WebSettings.TextSize.NORMAL);
        webSettings.setTextZoom(100);
        //不让从当前网页跳转到系统的浏览器中
        webview.setWebViewClient(new WebViewClient()
        {
            //当加载页面完成的时候回调
            @Override
            public void onPageFinished(WebView view, String url)
            {
                super.onPageFinished(view, url);
                pbLoading.setVisibility(View.GONE);
            }
        });
        webview.loadUrl(url);
//        webview.loadUrl("http://www.atguigu.com/teacher.shtml");

    }
}