黑马北京新闻项目连载(6)--->Gson解析、刷新加载、WebView展现

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主页面布局activity_main.xml

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

    <com.example.pulltorefreshview.RefreshListView
        android:id="@+id/lv_list"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:cacheColorHint="#fff"
        android:layout_weight="1" >
    </com.example.pulltorefreshview.RefreshListView>

</LinearLayout>

item布局list_news_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" 
    android:padding="10dp"
    >

    <ImageView
        android:id="@+id/iv_pic"
        android:layout_width="110dp"
        android:layout_height="70dp"
        android:scaleType="fitXY"
        android:padding="1dp"
        android:background="@android:color/darker_gray"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/image_demo" />

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="20dp"
        android:layout_toRightOf="@+id/iv_pic"
        android:text="新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题新闻标题"
        android:textColor="#000"
        android:maxLines="2"
        android:ellipsize="end"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/tv_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@id/tv_title"
        android:text="2015-03-16 16:20"
        android:layout_alignBottom="@id/iv_pic"
        android:textColor="@android:color/darker_gray"
        android:textSize="16sp" />

</RelativeLayout>

refresh_header.xml头布局

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

    <FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp" >

        <ImageView
            android:id="@+id/iv_arr"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:src="@drawable/common_listview_headview_red_arrow" />

        <ProgressBar
            android:id="@+id/pb_progress"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:indeterminateDrawable="@drawable/custom_progress"
            android:visibility="invisible" />
    </FrameLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:gravity="center"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/tv_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="下拉刷新"
            android:textColor="#f00"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/tv_time"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:text="最后刷新时间:2015-03-10 17:07:07"
            android:textColor="@android:color/darker_gray"
            android:textSize="14sp" />
    </LinearLayout>

</LinearLayout>

refresh_listview_footer.xml尾布局

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

    <ProgressBar
        android:id="@+id/pb_pull_list_header"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="5dp"
        android:indeterminateDrawable="@drawable/custom_progress" />

    <TextView
        android:id="@+id/tv_pull_list_header_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="加载中..."
        android:textColor="#ff0000"
        android:textSize="18sp" />

</LinearLayout>

custom_progress.xml自定义加载进度条

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="360" >

    <shape
        android:innerRadius="12dp"
        android:shape="ring"
        android:thickness="3dp"
        android:useLevel="false" >
        <gradient
            android:centerColor="#3f00"
            android:endColor="#f00"
            android:startColor="#fff" />
    </shape>

</rotate>

TabData--解析Json的对象封装类

package com.example.pulltorefreshview;

import java.util.ArrayList;

/**
 * 页签详情页数据
 * 
 * @author Kevin
 * 
 */
public class TabData {

	public int retcode;

	public TabDetail data;

	public class TabDetail {
		//北京
		public String title;
		public String more;
		public ArrayList<TabNewsData> news;
	}

	/**
	 * 新闻列表对象--listView的每一条数据
	 * news
	 */
	public class TabNewsData {
		public String id;
		public String listimage;
		public String pubdate;
		public String title;
		public String type;
		public String url;
	}

}

PrefUtils

package com.example.pulltorefreshview;

import android.content.Context;
import android.content.SharedPreferences;

/**
 * SharePreference封装
 */
public class PrefUtils {

	public static final String PREF_NAME = "config";

	public static boolean getBoolean(Context ctx, String key,
			boolean defaultValue) {
		SharedPreferences sp = ctx.getSharedPreferences(PREF_NAME,
				Context.MODE_PRIVATE);
		return sp.getBoolean(key, defaultValue);
	}

	public static void setBoolean(Context ctx, String key, boolean value) {
		SharedPreferences sp = ctx.getSharedPreferences(PREF_NAME,
				Context.MODE_PRIVATE);
		sp.edit().putBoolean(key, value).commit();
	}

	public static String getString(Context ctx, String key, String defaultValue) {
		SharedPreferences sp = ctx.getSharedPreferences(PREF_NAME,
				Context.MODE_PRIVATE);
		return sp.getString(key, defaultValue);
	}

	public static void setString(Context ctx, String key, String value) {
		SharedPreferences sp = ctx.getSharedPreferences(PREF_NAME,
				Context.MODE_PRIVATE);
		sp.edit().putString(key, value).commit();
	}
}

RefreshListView

package com.example.pulltorefreshview;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;


/**
 * 下拉刷新的ListView
 */
public class RefreshListView extends ListView implements OnScrollListener,
		android.widget.AdapterView.OnItemClickListener {
	private int startY = -1;// 滑动起点的y坐标
	private int mCurrrentState = STATE_PULL_REFRESH;// 当前状态

	private static final int STATE_PULL_REFRESH = 0;// 下拉刷新
	private static final int STATE_RELEASE_REFRESH = 1;// 松开刷新
	private static final int STATE_REFRESHING = 2;// 正在刷新

	
	//头布局视图
	private View mHeaderView;
	private TextView tvTitle;
	private TextView tvTime;
	private ImageView ivArrow;
	private ProgressBar pbProgress;
	private int mHeaderViewHeight;
	
	private RotateAnimation animUp;
	private RotateAnimation animDown;

	//脚布局视图
	private View mFooterView;
	private int mFooterViewHeight;
	/**************************************
	 * 构造方法
	 */
	public RefreshListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initHeaderView();
		initFooterView();
	}

	public RefreshListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		initHeaderView();
		initFooterView();
	}

	public RefreshListView(Context context) {
		super(context);
		initHeaderView();
		initFooterView();
	}

	/********************************************
	 * 初始化头布局
	 */
	private void initHeaderView() {
		//外层用线性布局，相对布局报错！！！
		mHeaderView = View.inflate(getContext(), R.layout.refresh_header, null);
		//listView的方法-添加头部
		this.addHeaderView(mHeaderView);

		//获取头布局里面的标题、刷新时间、箭头、进度条
		tvTitle = (TextView) mHeaderView.findViewById(R.id.tv_title);
		tvTime = (TextView) mHeaderView.findViewById(R.id.tv_time);
		ivArrow = (ImageView) mHeaderView.findViewById(R.id.iv_arr);
		pbProgress = (ProgressBar) mHeaderView.findViewById(R.id.pb_progress);

		//测量view的宽高的方法
		mHeaderView.measure(0, 0);
		//测量之后，获取view的高度
		mHeaderViewHeight = mHeaderView.getMeasuredHeight();

		//初始化View，隐藏头布局
		mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);

		//初始化动画
		initArrowAnim();

		tvTime.setText("最后刷新时间:" + getCurrentTime());
	}

	/**
	 * 初始化箭头动画
	 */
	private void initArrowAnim() {
		// 箭头向上动画
		animUp = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f,
				Animation.RELATIVE_TO_SELF, 0.5f);
		animUp.setDuration(200);
		animUp.setFillAfter(true);

		// 箭头向下动画
		animDown = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF,
				0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
		animDown.setDuration(200);
		animDown.setFillAfter(true);

	}
	/**
	 * 初始化脚布局
	 */

	private void initFooterView() {
		mFooterView = View.inflate(getContext(),
				R.layout.refresh_listview_footer, null);
		this.addFooterView(mFooterView);

		mFooterView.measure(0, 0);
		mFooterViewHeight = mFooterView.getMeasuredHeight();

		mFooterView.setPadding(0, -mFooterViewHeight, 0, 0);// 隐藏

		this.setOnScrollListener(this);
	}
/**********************************************/
	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		switch (ev.getAction()) {
		case MotionEvent.ACTION_DOWN:
			startY = (int) ev.getRawY();
			break;
		case MotionEvent.ACTION_MOVE:
			// 正在刷新时不做处理
			if (mCurrrentState == STATE_REFRESHING) {
				break;
			}

			// 移动便宜量
			int endY = (int) ev.getRawY();
			int dy = endY - startY;

			// 只有下拉并且当前是第一个item,才允许下拉
			if (dy > 0 && getFirstVisiblePosition() == 0) {
				int padding = dy - mHeaderViewHeight;// 计算padding
				mHeaderView.setPadding(0, padding, 0, 0);// 设置当前padding

				if (padding > 0 && mCurrrentState != STATE_RELEASE_REFRESH) {// 状态改为松开刷新
					mCurrrentState = STATE_RELEASE_REFRESH;
					refreshState();
				} else if (padding < 0 && mCurrrentState != STATE_PULL_REFRESH) {// 改为下拉刷新状态
					mCurrrentState = STATE_PULL_REFRESH;
					refreshState();
				}

				return true;
			}

			break;
		case MotionEvent.ACTION_UP:
			startY = -1;// 重置

			if (mCurrrentState == STATE_RELEASE_REFRESH) {
				mCurrrentState = STATE_REFRESHING;// 正在刷新
				mHeaderView.setPadding(0, 0, 0, 0);// 显示
				refreshState();
			} else if (mCurrrentState == STATE_PULL_REFRESH) {
				mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);// 隐藏
			}

			break;

		default:
			break;
		}
		return super.onTouchEvent(ev);
	}

	/**
	 * 刷新下拉控件的布局
	 */
	private void refreshState() {
		switch (mCurrrentState) {
		case STATE_PULL_REFRESH:
			tvTitle.setText("下拉刷新");
			ivArrow.setVisibility(View.VISIBLE);
			pbProgress.setVisibility(View.INVISIBLE);
			ivArrow.startAnimation(animDown);
			break;
		case STATE_RELEASE_REFRESH:
			tvTitle.setText("松开刷新");
			ivArrow.setVisibility(View.VISIBLE);
			pbProgress.setVisibility(View.INVISIBLE);
			ivArrow.startAnimation(animUp);
			break;
		case STATE_REFRESHING:
			tvTitle.setText("正在刷新...");
			ivArrow.clearAnimation();// 必须先清除动画,才能隐藏
			ivArrow.setVisibility(View.INVISIBLE);
			pbProgress.setVisibility(View.VISIBLE);

			if (mListener != null) {
				mListener.onRefresh();
			}
			break;

		default:
			break;
		}
	}


/*****************************************************
 * 刷新、加载监听事件
 */
	OnRefreshListener mListener;
	

	public void setOnRefreshListener(OnRefreshListener listener) {
		mListener = listener;
	}

	public interface OnRefreshListener {
		public void onRefresh();

		public void onLoadMore();// 加载下一页数据
	}

	/*
	 * 收起下拉刷新的控件
	 */
	private boolean isLoadingMore;
	public void onRefreshComplete(boolean success) {
		if (isLoadingMore) {// 正在加载更多...
			mFooterView.setPadding(0, -mFooterViewHeight, 0, 0);// 隐藏脚布局
			isLoadingMore = false;
		} else {
			mCurrrentState = STATE_PULL_REFRESH;
			tvTitle.setText("下拉刷新");
			ivArrow.setVisibility(View.VISIBLE);
			pbProgress.setVisibility(View.INVISIBLE);

			mHeaderView.setPadding(0, -mHeaderViewHeight, 0, 0);// 隐藏

			if (success) {
				tvTime.setText("最后刷新时间:" + getCurrentTime());
			}
		}
	}

	/**
	 * 获取当前时间
	 */
	public String getCurrentTime() {
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		return format.format(new Date());
	}


/***************实现setOnScrollListener的方法*******************/
	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		if (scrollState == SCROLL_STATE_IDLE
				|| scrollState == SCROLL_STATE_FLING) {

			if (getLastVisiblePosition() == getCount() - 1 && !isLoadingMore) {// 滑动到最后
				System.out.println("到底了.....");
				mFooterView.setPadding(0, 0, 0, 0);// 显示
				setSelection(getCount() - 1);// 改变listview显示位置

				isLoadingMore = true;

				if (mListener != null) {
					mListener.onLoadMore();
				}
			}
		}
	}

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

	}
	/**
	 * 设置点击Item监听事件
	 * **********************************************************/

	OnItemClickListener mItemClickListener;

	@Override
	public void setOnItemClickListener(
			android.widget.AdapterView.OnItemClickListener listener) {
		super.setOnItemClickListener(this);

		mItemClickListener = listener;
	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		if (mItemClickListener != null) {
			mItemClickListener.onItemClick(parent, view, position
					- getHeaderViewsCount(), id);
		}
	}

}

MainActivity

package com.example.pulltorefreshview;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.pulltorefreshview.RefreshListView.OnRefreshListener;
import com.example.pulltorefreshview.TabData.TabNewsData;
import com.google.gson.Gson;
import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;
public class MainActivity extends Activity{

	//展现页面的json数据
	private String mUrl = "http://zhihuibj.sinaapp.com/zhbj/10007/list_1.json";
	
	
	private TabData mTabDetailData;

	private RefreshListView lvList;// 新闻列表
	private ArrayList<TabNewsData> mNewsList; // 新闻数据集合
	private NewsAdapter mNewsAdapter;
	private String mMoreUrl;// 更多页面的地址


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//加载布局--只有一个自定义的ListView控件
		setContentView(R.layout.activity_main);
		lvList = (RefreshListView) findViewById(R.id.lv_list);
		
		/**从服务器获取Json数据*/
		getDataFromServer();
		
		
		
		/**设置listView的刷新、加载监听事件*/
		lvList.setOnRefreshListener(new OnRefreshListener() {
			
			@Override
			public void onRefresh() {
				getDataFromServer();
			}
			
			@Override
			public void onLoadMore() {
				if (mMoreUrl != null) {
					HttpUtils utils = new HttpUtils();
					utils.send(HttpMethod.GET, mMoreUrl, new RequestCallBack<String>() {

						@Override
						public void onSuccess(ResponseInfo<String> responseInfo) {
							String result = (String) responseInfo.result;
							//true代表需要加载更多
							parseData(result, true);

							lvList.onRefreshComplete(true);
						}

						@Override
						public void onFailure(HttpException error, String msg) {
							error.printStackTrace();
							lvList.onRefreshComplete(false);
						}
					});
				} else {
					Toast.makeText(MainActivity.this, "最后一页了", Toast.LENGTH_SHORT)
					.show();
					lvList.onRefreshComplete(false);// 收起加载更多的布局
				}
			}
		});
		
		/**
		 * 设置点击单条item的事件监听
		 */
		lvList.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				System.out.println("被点击:" + position);
				
				String ids = PrefUtils.getString(MainActivity.this, "read_ids", "");
				String readId = mNewsList.get(position).id;
				if (!ids.contains(readId)) {
					ids = ids + readId;
					PrefUtils.setString(MainActivity.this, "read_ids", ids);
				}
				// 实现局部界面刷新, 这个view就是被点击的item布局对象
				changeReadState(view);
				
				// 跳转新闻详情页
				Intent intent = new Intent();
				intent.setClass(MainActivity.this, NewsDetailActivity.class);
				intent.putExtra("url", mNewsList.get(position).url);
				startActivity(intent);
			}
		});

	}


	private void changeReadState(View view) {
		TextView tvTitle = (TextView) view.findViewById(R.id.tv_title);
		tvTitle.setTextColor(Color.GRAY);
	}


	/**
	 * 从数据库获取Json数据源
	 */
	private void getDataFromServer() {
		HttpUtils utils = new HttpUtils();
		utils.send(HttpMethod.GET, mUrl, new RequestCallBack<String>() {

			@Override
			public void onSuccess(ResponseInfo<String> responseInfo) {
				//获取北京页面的Json数据
				String result = (String) responseInfo.result;
				/**初始化加载页面isMore值为false--初始化不需要下拉刷新获取数据*/
				parseData(result, false);

				/**收起下拉刷新的控件????????????????*/
				lvList.onRefreshComplete(true);

			}

			@Override
			public void onFailure(HttpException error, String msg) {
				error.printStackTrace();
				//????????????????????不更新刷新时间
				lvList.onRefreshComplete(false);
			}
		});
	}
	/**
	 * 解析获取的Json数据
	 * 初始化加载页面isMore值为false--初始化不需要下拉刷新获取数据
	 */
	protected void parseData(String result, boolean isMore) {
		Gson gson = new Gson();
		mTabDetailData = gson.fromJson(result, TabData.class);

		// 处理下一页链接
		String more = mTabDetailData.data.more;
		if (!TextUtils.isEmpty(more)) {
			mMoreUrl = "http://zhihuibj.sinaapp.com/zhbj" + more;
		} else {
			mMoreUrl = null;
		}
		//初始化加载第一屏json列表数据
		if (!isMore) {

			mNewsList = mTabDetailData.data.news;


			if (mNewsList != null) {
				mNewsAdapter = new NewsAdapter();
				lvList.setAdapter(mNewsAdapter);
			}


		} else {
			// 如果是加载下一页,需要将数据追加给原来的集合
			ArrayList<TabNewsData> news = mTabDetailData.data.news;
			mNewsList.addAll(news);
			mNewsAdapter.notifyDataSetChanged();
		}
	}
	/*******************************
	 */
	class NewsAdapter extends BaseAdapter {

		private BitmapUtils utils;

		public NewsAdapter() {
			utils = new BitmapUtils(MainActivity.this);
			utils.configDefaultLoadingImage(R.drawable.pic_item_list_default);
		}

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

		@Override
		public TabNewsData getItem(int position) {
			return mNewsList.get(position);
		}

		@Override
		public long getItemId(int position) {
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder holder;
			if (convertView == null) {
				convertView = View.inflate(MainActivity.this, R.layout.list_news_item,
						null);
				holder = new ViewHolder();
				holder.ivPic = (ImageView) convertView
						.findViewById(R.id.iv_pic);
				holder.tvTitle = (TextView) convertView
						.findViewById(R.id.tv_title);
				holder.tvDate = (TextView) convertView
						.findViewById(R.id.tv_date);

				convertView.setTag(holder);
			} else {
				holder = (ViewHolder) convertView.getTag();
			}

			TabNewsData item = getItem(position);

			holder.tvTitle.setText(item.title);
			holder.tvDate.setText(item.pubdate);

			utils.display(holder.ivPic, item.listimage);

			//标记已经读取
			String ids = PrefUtils.getString(MainActivity.this, "read_ids", "");
			if (ids.contains(getItem(position).id)) {
				holder.tvTitle.setTextColor(Color.GRAY);
			} else {
				holder.tvTitle.setTextColor(Color.BLACK);
			}

			return convertView;
		}

	}

	static class ViewHolder {
		public TextView tvTitle;
		public TextView tvDate;
		public ImageView ivPic;
	}

}

——————————————————Item页面详情——————————————

activity_news_detail.xml

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

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/title_red_bg" >

        <ImageButton
            android:id="@+id/btn_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="5dp"
            android:background="@null"
            android:src="@drawable/back" />

        <ImageButton
            android:id="@+id/btn_share"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="5dp"
            android:background="@null"
            android:src="@drawable/icon_share" />

        <ImageButton
            android:id="@+id/btn_size"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginRight="5dp"
            android:layout_toLeftOf="@id/btn_share"
            android:background="@null"
            android:src="@drawable/icon_textsize" />
    </RelativeLayout>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >

        <WebView
            android:id="@+id/wv_web"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <ProgressBar
            android:id="@+id/pb_progress"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:indeterminateDrawable="@drawable/custom_progress" />
    </FrameLayout>

</LinearLayout>

NewsDetailActivity

package com.example.pulltorefreshview;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebSettings.TextSize;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageButton;
import android.widget.ProgressBar;

public class NewsDetailActivity extends Activity implements OnClickListener {

	private WebView mWebView;
	private ImageButton btnBack;
	private ImageButton btnSize;

	private ProgressBar pbProgress;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_news_detail);

		mWebView = (WebView) findViewById(R.id.wv_web);
		btnBack = (ImageButton) findViewById(R.id.btn_back);
		btnSize = (ImageButton) findViewById(R.id.btn_size);

		btnBack.setOnClickListener(this);
		btnSize.setOnClickListener(this);

		pbProgress = (ProgressBar) findViewById(R.id.pb_progress);

		String url = getIntent().getStringExtra("url");

		WebSettings settings = mWebView.getSettings();
		settings.setJavaScriptEnabled(true);// 表示支持js
		settings.setBuiltInZoomControls(true);// 显示放大缩小按钮
		settings.setUseWideViewPort(true);// 支持双击缩放

		mWebView.setWebViewClient(new WebViewClient() {

			/**
			 * 网页开始加载
			 */
			@Override
			public void onPageStarted(WebView view, String url, Bitmap favicon) {
				super.onPageStarted(view, url, favicon);
				System.out.println("网页开始加载");
				pbProgress.setVisibility(View.VISIBLE);
			}

			/**
			 * 网页加载结束
			 */
			@Override
			public void onPageFinished(WebView view, String url) {
				super.onPageFinished(view, url);
				System.out.println("网页开始结束");

				pbProgress.setVisibility(View.GONE);
			}

			/**
			 * 所有跳转的链接都会在此方法中回调
			 */
			@Override
			public boolean shouldOverrideUrlLoading(WebView view, String url) {
				// tel:110
				System.out.println("跳转url:" + url);
				view.loadUrl(url);

				return true;
				// return super.shouldOverrideUrlLoading(view, url);
			}
		});
		// mWebView.goBack()

		mWebView.setWebChromeClient(new WebChromeClient() {

			/**
			 * 进度发生变化
			 */
			@Override
			public void onProgressChanged(WebView view, int newProgress) {
				System.out.println("加载进度:" + newProgress);
				super.onProgressChanged(view, newProgress);
			}

			/**
			 * 获取网页标题
			 */
			@Override
			public void onReceivedTitle(WebView view, String title) {
				System.out.println("网页标题:" + title);
				super.onReceivedTitle(view, title);
			}
		});

		mWebView.loadUrl(url);// 加载网页
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btn_back:
			finish();
			break;
		case R.id.btn_size:
			showChooseDialog();
			break;

		default:
			break;
		}
	}

	private int mCurrentChooseItem;// 记录当前选中的item, 点击确定前
	private int mCurrentItem = 2;// 记录当前选中的item, 点击确定后

	/**
	 * 显示选择对话框
	 */
	private void showChooseDialog() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);

		String[] items = new String[] { "超大号字体", "大号字体", "正常字体", "小号字体",
				"超小号字体" };
		builder.setTitle("字体设置");
		builder.setSingleChoiceItems(items, mCurrentItem,
				new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
						System.out.println("选中:" + which);
						mCurrentChooseItem = which;
					}
				});

		builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

			@Override
			public void onClick(DialogInterface dialog, int which) {
				WebSettings settings = mWebView.getSettings();
				switch (mCurrentChooseItem) {
				case 0:
					settings.setTextSize(TextSize.LARGEST);
					break;
				case 1:
					settings.setTextSize(TextSize.LARGER);
					break;
				case 2:
					settings.setTextSize(TextSize.NORMAL);
					break;
				case 3:
					settings.setTextSize(TextSize.SMALLER);
					break;
				case 4:
					settings.setTextSize(TextSize.SMALLEST);
					break;

				default:
					break;
				}

				mCurrentItem = mCurrentChooseItem;
			}
		});

		builder.setNegativeButton("取消", null);

		builder.show();
	}

}