Android学习笔记_48_若水新闻客户端源码剖析

一、新闻客户端布局代码

1.1 主界面布局

　　　　使用GridView实现左右可滑动菜单项，使用标签HorizontalScrollView实现水平滚动条，将创建的GridView添加到布局文件中。　

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@id/main_layout"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@drawable/main_background"

    >

    <RelativeLayout

        android:id="@id/titlebar_layout"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:background="@drawable/titlebar_background"

        >

        <TextView

            android:id="@id/titlebar_title"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginTop="8.0dip"

            android:layout_marginLeft="15.0dip"

            android:textAppearance="@style/titlebar_title_style"

            android:text="@string/app_name"/>

        <Button

            android:id="@id/titlebar_refresh"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:background="@drawable/titlebar_btn_refresh_selector"

            android:layout_marginTop="7.0dip"

            android:layout_marginRight="14.0dip"

            android:layout_alignParentRight="true"

            />

        <ProgressBar

            android:id="@id/loadnews_progress"

            android:layout_width="25.0dip"

            android:layout_height="25.0dip"

            android:clickable="false"

            android:visibility="gone"

            android:layout_marginRight="20.0dip"

            android:layout_marginTop="10.0dip"

            android:layout_alignParentRight="true"

            style="?android:attr/progressBarStyleLarge" />

    </RelativeLayout>

    <RelativeLayout

        android:id="@id/categorybar_layout"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:background="@drawable/categorybar_background"

        android:layout_marginTop="-18.0dip"

        >

        <Button

            android:id="@id/category_arrow_right"

            android:layout_width="6.0dip"

            android:layout_height="10.0dip"

            android:background="@drawable/categorybar_right_arrow"

            android:layout_marginLeft="2.0dip"

            android:layout_marginRight="10.0dip"

            android:layout_alignParentRight="true"

            android:layout_centerVertical="true" />

        <HorizontalScrollView

            android:id="@id/category_scrollview"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginLeft="6.0dip"

            android:scrollbars="none"

            android:layout_toLeftOf="@id/category_arrow_right"

            android:layout_centerVertical="true">

            <LinearLayout

                android:id="@id/category_layout"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:gravity="center_vertical"

                    />

        </HorizontalScrollView>

    </RelativeLayout>

    <ListView

        android:id="@+id/newslist"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:listSelector="@drawable/newslist_item_selector"

        android:cacheColorHint="#00000000"

        android:divider="@drawable/list_separator_line"

        />

</LinearLayout>

二、ViewFlipper的应用

2.1 界面布局

　　　　进入到新闻详细界面，通过手指滑动实现下一条新闻和上一条新闻的切换。newsdetails.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@id/newsdetails_layout"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@drawable/main_background"

    android:layout_marginBottom="0.0dip"

    >

    <RelativeLayout

        android:id="@id/newsdetails_titlebar_layout"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:background="@drawable/titlebar_background"

        >

        <Button

            android:id="@id/newsdetails_titlebar_previous"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginTop="7.0dip"

            android:layout_marginLeft="5.0dip"

            android:layout_alignParentLeft="true"

            android:background="@drawable/newsdetails_title_previous_btn_selector"

            android:textSize="14.0sp"

            android:textStyle="bold"

            />

        <TextView

            android:id="@id/newsdetails_titlebar_title"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginLeft="15.0dip"

            android:layout_marginTop="10.0dip"

            android:layout_toRightOf="@id/newsdetails_titlebar_previous"

            android:textSize="18.0sp"

            android:textColor="@color/white"

            android:text="国内"

            />

        <Button

            android:id="@id/newsdetails_titlebar_next"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginTop="7.0dip"

            android:layout_marginRight="5.0dip"

            android:layout_alignParentRight="true"

            android:background="@drawable/newsdetails_title_next_btn_selector"

            />

        <Button

            android:id="@id/newsdetails_titlebar_comments"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentRight="true"

            android:layout_marginRight="60.0dip"

            android:layout_marginTop="9.0dip"

            android:background="@drawable/newsdetails_titlebar_comments_background"

            android:textColor="@color/white"

            android:text="0跟帖"

            />

        <ProgressBar

            android:id="@id/loadnews_progress"

            android:layout_width="25.0dip"

            android:layout_height="25.0dip"

            android:clickable="false"

            android:visibility="gone"

            android:layout_marginRight="30.0dip"

            android:layout_marginTop="10.0dip"

            android:layout_alignParentRight="true"

            style="?android:attr/progressBarStyleLarge" />

    </RelativeLayout>    

    <ViewFlipper

        android:id="@id/news_body_flipper"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:background="@drawable/main_background"

        android:layout_marginTop="-12.0dip"

        android:layout_marginBottom="40.0dip"

        android:layout_below="@id/newsdetails_titlebar_layout" />

    <include

        android:id="@id/comments_reply_frame"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        layout="@layout/reply_frame" />

</RelativeLayout>

news_body.xml

<?xml version="1.0" encoding="UTF-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:szy="http://schemas.android.com/apk/res/com.szy.news.activity"

    android:id="@id/news_body_layout"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:layout_below="@id/newsdetails_titlebar_layout"

    >

    <ScrollView

        android:id="@id/news_body_scrollview"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:background="#FFE7E7E7"

        android:fadingEdge="none"

        >

        <LinearLayout

            android:layout_width="fill_parent"

            android:layout_height="wrap_content"

            android:orientation="vertical">

            <LinearLayout

                android:layout_width="fill_parent"

                android:layout_height="wrap_content"

                android:orientation="vertical">

                <TextView

                    android:id="@id/news_body_title"

                    android:layout_width="fill_parent"

                    android:layout_height="wrap_content"

                    android:layout_marginLeft="12.0dip"

                    android:layout_marginTop="12.0dip"

                    android:layout_marginRight="12.0dip"

                    android:textColor="#FF272727"

                    android:textSize="18.0dip"

                    android:textStyle="bold"

                    />

                <TextView

                    android:id="@id/news_body_ptime_source"

                    android:layout_width="fill_parent"

                    android:layout_height="wrap_content"

                    android:layout_marginLeft="12.0dip"

                    android:layout_marginTop="9.0dip"

                    android:layout_marginRight="12.0dip"

                    android:textColor="#FF888888"

                    android:textSize="12.0sp"

                    />

                <ImageView

                    android:id="@id/news_body_separator_line"

                    android:layout_width="fill_parent"

                    android:layout_height="wrap_content"

                    android:layout_marginTop="8.0dip"

                    android:visibility="visible"

                    android:src="@drawable/list_separator_line"

                    />

                <ProgressBar

                    android:id="@id/news_body_details_loading"

                    android:layout_width="16.0dip"

                    android:layout_height="16.0dip"

                    android:layout_marginLeft="152.0dip"

                    android:layout_marginTop="10.0dip"

                    android:layout_centerHorizontal="true"

                    android:layout_centerVertical="true"

                    android:visibility="gone"

                    android:clickable="false"

                    style="?android:attr/progressBarStyleLarge" />

            </LinearLayout>

            <!--

            <TextView

                android:id="@id/news_body_details"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:layout_marginTop="5.0dip"

                android:textColor="#ff000000"

                />

             -->

             <com.szy.news.view.CustomTextView

                android:id="@id/news_body_details"

                android:layout_width="fill_parent"

                android:layout_height="wrap_content"

                szy:image_width="200dip"

                szy:image_height="52dip"

                />

        </LinearLayout>

    </ScrollView>

</LinearLayout>

详细新闻的activity的实现，通过自定义控件显示新闻内容，监听新闻内容的触摸事件：

package com.szy.news.activity;

import java.io.Serializable;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import org.json.JSONArray;

import org.json.JSONObject;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.View.OnTouchListener;

import android.view.inputmethod.InputMethodManager;

import android.widget.Button;

import android.widget.ImageButton;

import android.widget.LinearLayout;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.ViewFlipper;

import com.szy.news.model.Parameter;

import com.szy.news.service.SyncHttp;

import com.szy.news.view.CustomTextView;

/**

 *@author coolszy

 *@date 2012-3-19

 *@blog http://blog.92coding.com

 */

public class NewsDetailsActivity extends Activity

{

    private final int FINISH = 0;

    private ViewFlipper mNewsBodyFlipper;

    private LayoutInflater mNewsBodyInflater;

    private float mStartX;

    private ArrayList<HashMap<String, Object>> mNewsData;

    private int mPosition = 0;

    private int mCursor;

    private int mNid;

    private CustomTextView mNewsDetails;

    private Button mNewsdetailsTitlebarComm;// 新闻回复数

    private ImageButton mNewsReplyImgBtn;// 发表新闻回复图片

    private LinearLayout mNewsReplyImgLayout;// 发表新闻回复图片Layout

    private LinearLayout mNewsReplyEditLayout;// 发表新闻回复回复Layout

    private TextView mNewsReplyContent;// 新闻回复内容

    private boolean keyboardShow = false; //软件盘是否可见

    private Handler mHandler = new Handler()

    {

        @SuppressWarnings("unchecked")

        @Override

        public void handleMessage(Message msg)

        {

            switch (msg.arg1)

            {

            case FINISH:

                // 把获取到的新闻显示到界面上

                ArrayList<HashMap<String, Object>> bodyList = (ArrayList<HashMap<String,Object>>)msg.obj;

                System.out.println("###:"+bodyList.size());

                mNewsDetails.setText(bodyList);

                break;

            }

        }

    };

    @SuppressWarnings("unchecked")

    @Override

    public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.newsdetails);

        // 查找新闻回复图片Layout

        mNewsReplyImgLayout = (LinearLayout) findViewById(R.id.news_reply_img_layout);

        // 查找新闻回复回复Layout

        mNewsReplyEditLayout = (LinearLayout) findViewById(R.id.news_reply_edit_layout);

        // 新闻回复内容

        mNewsReplyContent = (TextView) findViewById(R.id.news_reply_edittext);

        NewsDetailsOnClickListener newsDetailsOnClickListener = new NewsDetailsOnClickListener();

        // 上一篇新闻

        Button newsDetailsTitlebarPref = (Button) findViewById(R.id.newsdetails_titlebar_previous);

        newsDetailsTitlebarPref.setOnClickListener(newsDetailsOnClickListener);

        // 下一篇新闻

        Button newsDetailsTitlebarNext = (Button) findViewById(R.id.newsdetails_titlebar_next);

        newsDetailsTitlebarNext.setOnClickListener(newsDetailsOnClickListener);

        // 新闻回复条数Button

        mNewsdetailsTitlebarComm = (Button) findViewById(R.id.newsdetails_titlebar_comments);

        mNewsdetailsTitlebarComm.setOnClickListener(newsDetailsOnClickListener);

        // 发表新闻回复图片Button

        mNewsReplyImgBtn = (ImageButton) findViewById(R.id.news_reply_img_btn);

        mNewsReplyImgBtn.setOnClickListener(newsDetailsOnClickListener);

        // 发表回复

        Button newsReplyPost = (Button) findViewById(R.id.news_reply_post);

        newsReplyPost.setOnClickListener(newsDetailsOnClickListener);

        // 获取传递的数据

        Intent intent = getIntent();

        Bundle bundle = intent.getExtras();

        // 设置标题栏名称

        String categoryName = bundle.getString("categoryName");

        TextView titleBarTitle = (TextView) findViewById(R.id.newsdetails_titlebar_title);

        titleBarTitle.setText(categoryName);

        // 获取新闻集合

        Serializable s = bundle.getSerializable("newsDate");

        mNewsData = (ArrayList<HashMap<String, Object>>) s;

        // 获取点击位置

        mCursor = mPosition = bundle.getInt("position");

        // 动态创建新闻视图，并赋值

        mNewsBodyInflater = getLayoutInflater();

        inflateView(0);

    }

    /**

     * 处理NewsDetailsTitleBar点击事件

     */

    class NewsDetailsOnClickListener implements OnClickListener

    {

        @Override

        public void onClick(View v)

        {

            InputMethodManager m = (InputMethodManager) mNewsReplyContent.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);

            switch (v.getId())

            {

            // 上一条新闻

            case R.id.newsdetails_titlebar_previous:

                showPrevious();

                break;

            // 下一条新闻

            case R.id.newsdetails_titlebar_next:

                showNext();

                break;

            // 显示评论

            case R.id.newsdetails_titlebar_comments:

                Intent intent = new Intent(NewsDetailsActivity.this, CommentsActivity.class);

                //传递新闻ID

                intent.putExtra("nid", mNid);

                startActivity(intent);

                break;

            // 新闻回复图片

            case R.id.news_reply_img_btn:

                mNewsReplyImgLayout.setVisibility(View.GONE);

                mNewsReplyEditLayout.setVisibility(View.VISIBLE);

                mNewsReplyContent.requestFocus();

                m.toggleSoftInput(0, InputMethodManager.SHOW_IMPLICIT);

                keyboardShow = true;

                break;

            // 发表新闻回复

            case R.id.news_reply_post:

                mNewsReplyEditLayout.post(new PostCommentThread());

                mNewsReplyImgLayout.setVisibility(View.VISIBLE);

                mNewsReplyEditLayout.setVisibility(View.GONE);

                m.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);

                break;

            }

        }

    }

    /**

     * 处理新闻NewsBody触摸事件

     */

    class NewsBodyOnTouchListener implements OnTouchListener

    {

        @Override

        public boolean onTouch(View v, MotionEvent event)

        {

            switch (event.getAction())

            {

            // 手指按下

            case MotionEvent.ACTION_DOWN:

                if (keyboardShow)

                {

                    // 设置新闻回复Layout是否可见

                    mNewsReplyImgLayout.setVisibility(View.VISIBLE);

                    mNewsReplyEditLayout.setVisibility(View.GONE);

                    InputMethodManager m = (InputMethodManager) mNewsReplyContent.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);

                    m.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);

                    keyboardShow = false;

                }

                // 记录起始坐标

                mStartX = event.getX();

                break;

            // 手指抬起

            case MotionEvent.ACTION_UP:

                // 往左滑动

                if (event.getX() < mStartX)

                {

                    showPrevious();

                }

                // 往右滑动

                else if (event.getX() > mStartX)

                {

                    showNext();

                }

                break;

            }

            return true;

        }

    }

    /**

     * 显示下一条新闻

     */

    private void showNext()

    {

        // 判断是否是最后一篇win问:mPosition: 当前新闻的索引

        if (mPosition < mNewsData.size() - 1)

        {

            // 设置下一屏动画

            mNewsBodyFlipper.setInAnimation(this, R.anim.push_left_in);

            mNewsBodyFlipper.setOutAnimation(this, R.anim.push_left_out);

            mPosition++;

            HashMap<String, Object> hashMap = mNewsData.get(mPosition);

            mNid = (Integer) hashMap.get("nid");

            // 判断下一屏是否已经创建

            if (mPosition >= mNewsBodyFlipper.getChildCount())

            {

                inflateView(mNewsBodyFlipper.getChildCount());

            }

            // 显示下一屏

            mNewsBodyFlipper.showNext();

        } else

        {

            Toast.makeText(this, R.string.no_next_news, Toast.LENGTH_SHORT).show();

        }

        System.out.println(mCursor + ";" + mPosition);

    }

    private void showPrevious()

    {

        if (mPosition > 0)

        {

            mPosition--;

            // 记录当前新闻编号

            HashMap<String, Object> hashMap = mNewsData.get(mPosition);

            mNid = (Integer) hashMap.get("nid");

            if (mCursor > mPosition)

            {

                mCursor = mPosition;

                inflateView(0);

                System.out.println(mNewsBodyFlipper.getChildCount());

                mNewsBodyFlipper.showNext();// 显示下一页

            }

            mNewsBodyFlipper.setInAnimation(this, R.anim.push_right_in);// 定义下一页进来时的动画

            mNewsBodyFlipper.setOutAnimation(this, R.anim.push_right_out);// 定义当前页出去的动画

            mNewsBodyFlipper.showPrevious();// 显示上一页

        } else

        {

            Toast.makeText(this, R.string.no_pre_news, Toast.LENGTH_SHORT).show();

        }

    }

    private void inflateView(int index)

    {

        // 动态创建新闻视图，并赋值

        View newsBodyLayout = mNewsBodyInflater.inflate(R.layout.news_body, null);

        // 获取点击新闻基本信息

        HashMap<String, Object> hashMap = mNewsData.get(mPosition);

        // 新闻标题

        TextView newsTitle = (TextView) newsBodyLayout.findViewById(R.id.news_body_title);

        newsTitle.setText(hashMap.get("newslist_item_title").toString());

        // 发布时间和出处

        TextView newsPtimeAndSource = (TextView) newsBodyLayout.findViewById(R.id.news_body_ptime_source);

        newsPtimeAndSource.setText(hashMap.get("newslist_item_ptime").toString() + "    " + hashMap.get("newslist_item_source").toString());

        // 新闻编号

        mNid = (Integer) hashMap.get("nid");

        // 新闻回复数

        mNewsdetailsTitlebarComm.setText(hashMap.get("newslist_item_comments") + "跟帖");

        // 把新闻视图添加到Flipper中

        mNewsBodyFlipper = (ViewFlipper) findViewById(R.id.news_body_flipper);

        mNewsBodyFlipper.addView(newsBodyLayout, index);

        // 给新闻Body添加触摸事件

        mNewsDetails = (CustomTextView) newsBodyLayout.findViewById(R.id.news_body_details);

        mNewsDetails.setOnTouchListener(new NewsBodyOnTouchListener());

        // 启动线程

        new UpdateNewsThread().start();

    }

    /**

     * 获取新闻详细信息

     *

     * @return

     */

    private ArrayList<HashMap<String, Object>> getNewsBody()

    {

//        String retStr = "网络连接失败，请稍后再试";

        ArrayList<HashMap<String, Object>> bodyList = new ArrayList<HashMap<String,Object>>();

        SyncHttp syncHttp = new SyncHttp();

        String url = "http://10.0.2.2:8080/web/getNews";

        String params = "nid=" + mNid;

        try

        {

            String retString = syncHttp.httpGet(url, params);

            JSONObject jsonObject = new JSONObject(retString);

            // 获取返回码，0表示成功

            int retCode = jsonObject.getInt("ret");

            if (0 == retCode)

            {

                JSONObject dataObject = jsonObject.getJSONObject("data");

                JSONObject newsObject = dataObject.getJSONObject("news");

//              测试自定义控件

//                retStr = newsObject.getString("body");

                JSONArray bodyArray = newsObject.getJSONArray("body");

                for (int i=0;i<bodyArray.length();i++)

                {

                    JSONObject object = (JSONObject)bodyArray.opt(i);

                    HashMap<String, Object> hashMap = new HashMap<String, Object>();

                    hashMap.put("index", object.get("index"));

                    hashMap.put("type", object.get("type"));

                    hashMap.put("value", object.get("value"));

                    bodyList.add(hashMap);

                }

            }

        } catch (Exception e)

        {

            e.printStackTrace();

        }

//      测试自定义控件

//        return retStr;

        return bodyList;

    }

    /**

     * 更新新闻内容

     *

     * @author coolszy

     *@date 2012-4-22

     *@blog http://blog.92coding.com

     */

    private class UpdateNewsThread extends Thread

    {

        @Override

        public void run()

        {

            // 从网络上获取新闻

//            测试自定义控件

//            String newsBody = getNewsBody();

            ArrayList<HashMap<String, Object>> bodyList = getNewsBody();

            Message msg = mHandler.obtainMessage();

            System.out.println("@@@:"+bodyList.size());

            msg.arg1 = FINISH;

            msg.obj = bodyList;

            mHandler.sendMessage(msg);

        }

    }

    /**

     * 发表回复

     *

     * @author coolszy

     *@date 2012-4-22

     *@blog http://blog.92coding.com

     */

    private class PostCommentThread extends Thread

    {

        @Override

        public void run()

        {

            SyncHttp syncHttp = new SyncHttp();

            String url = "http://10.0.2.2:8080/web/postComment";

            List<Parameter> params = new ArrayList<Parameter>();

            params.add(new Parameter("nid", mNid + ""));

            params.add(new Parameter("region", "江苏省连云港市"));

            params.add(new Parameter("content", mNewsReplyContent.getText().toString()));

            try

            {

                String retStr = syncHttp.httpPost(url, params);

                JSONObject jsonObject = new JSONObject(retStr);

                int retCode = jsonObject.getInt("ret");

                if (0 == retCode)

                {

                    Toast.makeText(NewsDetailsActivity.this, R.string.post_success, Toast.LENGTH_SHORT).show();

                    mNewsReplyImgLayout.setVisibility(View.VISIBLE);

                    mNewsReplyEditLayout.setVisibility(View.GONE);

                    return;

                }

            } catch (Exception e)

            {

                e.printStackTrace();

            }

            Toast.makeText(NewsDetailsActivity.this, R.string.post_failure, Toast.LENGTH_SHORT).show();

        }

    }

}

三、自定义控件实现图文混排

1.1 自定义控件图文混排

package com.szy.news.view;

import java.net.URL;

import java.util.ArrayList;

import java.util.HashMap;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.drawable.Drawable;

import android.os.Handler;

import android.os.Message;

import android.os.SystemClock;

import android.text.Html;

import android.util.AttributeSet;

import android.view.Gravity;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.TextView;

import android.widget.ImageView.ScaleType;

import com.szy.news.activity.R;

/**

 *@author coolszy

 *@date 2012-5-1

 *@blog http://blog.92coding.com

 */

public class CustomTextView extends LinearLayout

{

    private Context mContext;

    private TypedArray mTypedArray;

    public CustomTextView(Context context)

    {

        this(context, null);

    }

    public CustomTextView(Context context, AttributeSet attrs)

    {

        super(context, attrs);

        this.mContext = context;

        setOrientation(LinearLayout.VERTICAL);

        mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.customTextView);

    }

    public void setText(ArrayList<HashMap<String, Object>> datas)

    {

        for (HashMap<String, Object> hashMap : datas)

        {

            //如果是图片

            if (hashMap.get("type").equals("image"))

            {

                int imageWidth = mTypedArray.getDimensionPixelOffset(R.styleable.customTextView_image_width, 100);

                int imageheight = mTypedArray.getDimensionPixelOffset(R.styleable.customTextView_image_height, 100);

                //创建ImageView并设置属性

                ImageView imageView = new ImageView(mContext);

                LayoutParams params = new LayoutParams(imageWidth, imageheight);

                params.gravity = Gravity.CENTER_HORIZONTAL;//居中

                imageView.setLayoutParams(params);

                imageView.setImageResource(R.drawable.kuka);//默认图片

                imageView.setScaleType(ScaleType.CENTER_INSIDE);

                addView(imageView);

                //启动线程，异步加载图片

                new DownloadPicThread(imageView,hashMap.get("value").toString()).start();

            }

            //反之则已文本显示

            else

            {

                //创建TextView并设置属性

                TextView textView = new TextView(mContext);

                textView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

                float textSize = mTypedArray.getDimension(R.styleable.customTextView_textSize, 16);

                int textColor = mTypedArray.getColor(R.styleable.customTextView_textColor, 0xFF000000);

                textView.setTextSize(textSize);

                textView.setTextColor(textColor);

                textView.setText(Html.fromHtml(hashMap.get("value").toString()));

                addView(textView);

            }

        }

    }

    private Handler mHandler = new Handler()

    {

        @SuppressWarnings("unchecked")

        @Override

        public void handleMessage(Message msg)

        {

            HashMap<String, Object> hashMap = (HashMap<String, Object>)msg.obj;

            ImageView imageView = (ImageView)hashMap.get("imageview");

            LayoutParams params = new LayoutParams(msg.arg1,msg.arg2);

            params.gravity = Gravity.CENTER_HORIZONTAL;//居中

            imageView.setLayoutParams(params);

            Drawable drawable = (Drawable)hashMap.get("drawable");

            imageView.setImageDrawable(drawable);

        }

    };

    private class DownloadPicThread extends Thread

    {

        private ImageView mImageView;

        private String mUrl;

        public DownloadPicThread(ImageView imageView, String url)

        {

            super();

            this.mImageView = imageView;

            this.mUrl = url;

        }

        public void run()

        {

            Drawable drawable = null;

            int newImgWidth = 0;

            int newImgHeigth = 0;

            try

            {

                drawable = Drawable.createFromStream(new URL(mUrl).openStream(), "image");

                newImgWidth = drawable.getIntrinsicWidth() / 3;

                newImgHeigth = drawable.getIntrinsicHeight() / 3;

            } catch (Exception e)

            {

                e.printStackTrace();

            }

            //为了更好的看到效果，让线程休眠2秒

            SystemClock.sleep(2000);

            //使用Handler更新UI

            Message msg = mHandler.obtainMessage();

            HashMap<String, Object> hashMap = new HashMap<String, Object>();

            hashMap.put("imageview", mImageView);

            hashMap.put("drawable", drawable);

            msg.obj = hashMap;

            msg.arg1 = newImgWidth;

            msg.arg2 = newImgHeigth;

            mHandler.sendMessage(msg);

        }

    }

}

四、新闻客户端布局代码

4.1 使GridView控件第一项默认选中

public class CustomSimpleAdapter extends SimpleAdapter

{

    public CustomSimpleAdapter(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)

    {

        super(context, data, resource, from, to);

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent)

    {

        View v = super.getView(position, convertView, parent);

        //更新第一个TextView的背景

        if (position==0)

        {

            TextView categoryTitle = (TextView)v;

            categoryTitle.setBackgroundResource(R.drawable.categorybar_item_background);

            categoryTitle.setTextColor(0XFFFFFFFF);

        }

        return v;

    }

}

4.2 gridview每项切换效果,ListView添加footer

package com.szy.news.activity;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import org.json.JSONArray;

import org.json.JSONObject;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Color;

import android.graphics.drawable.ColorDrawable;

import android.os.AsyncTask;

import android.os.Bundle;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup.LayoutParams;

import android.widget.AdapterView;

import android.widget.Button;

import android.widget.GridView;

import android.widget.HorizontalScrollView;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.ProgressBar;

import android.widget.SimpleAdapter;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.AdapterView.OnItemClickListener;

import com.szy.news.custom.Category;

import com.szy.news.custom.CustomSimpleAdapter;

import com.szy.news.service.SyncHttp;

import com.szy.news.service.UpdateManager;

import com.szy.news.util.DensityUtil;

import com.szy.news.util.StringUtil;

public class MainActivity extends Activity

{

    private final int COLUMNWIDTHPX = 55;

    private final int FLINGVELOCITYPX = 800; // 滚动距离

    private final int NEWSCOUNT = 5; //返回新闻数目

    private final int SUCCESS = 0;//加载成功

    private final int NONEWS = 1;//该栏目下没有新闻

    private final int NOMORENEWS = 2;//该栏目下没有更多新闻

    private final int LOADERROR = 3;//加载失败

    private int mColumnWidthDip;

    private int mFlingVelocityDip;

    private int mCid;

    private String mCatName;

    private ArrayList<HashMap<String, Object>> mNewsData;

    private ListView mNewsList;

    private SimpleAdapter mNewsListAdapter;

    private LayoutInflater mInflater;

    private Button mTitlebarRefresh;

    private ProgressBar mLoadnewsProgress;

    private Button mLoadMoreBtn;

    private LoadNewsAsyncTask loadNewsAsyncTask;

    @Override

    public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        mInflater = getLayoutInflater();

        mNewsData = new ArrayList<HashMap<String,Object>>();

        mNewsList = (ListView)findViewById(R.id.newslist);

        mTitlebarRefresh = (Button)findViewById(R.id.titlebar_refresh);

        mLoadnewsProgress = (ProgressBar)findViewById(R.id.loadnews_progress);

        mTitlebarRefresh.setOnClickListener(loadMoreListener);

        //把px转换成dip

        mColumnWidthDip = DensityUtil.px2dip(this, COLUMNWIDTHPX);

        mFlingVelocityDip = DensityUtil.px2dip(this, FLINGVELOCITYPX);

        //获取新闻分类

        String[] categoryArray = getResources().getStringArray(R.array.categories);

        //把新闻分类保存到List中

        final List<HashMap<String, Category>> categories = new ArrayList<HashMap<String, Category>>();

        //分割新闻类型字符串

        for(int i=0;i<categoryArray.length;i++)

        {

            String[] temp = categoryArray[i].split("[|]");

            if (temp.length==2)

            {

                int cid = StringUtil.String2Int(temp[0]);

                String title = temp[1];

                Category type = new Category(cid, title);

                HashMap<String, Category> hashMap = new HashMap<String, Category>();

                hashMap.put("category_title", type);

                categories.add(hashMap);

            }

        }

        //默认选中的新闻分类

        mCid = 1;

        mCatName ="国内";

        //创建Adapter，指明映射字段

        CustomSimpleAdapter categoryAdapter = new CustomSimpleAdapter(this, categories, R.layout.category_title, new String[]{"category_title"}, new int[]{R.id.category_title});

        GridView category = new GridView(this);

        category.setColumnWidth(mColumnWidthDip);//每个单元格宽度

        category.setNumColumns(GridView.AUTO_FIT);//单元格数目

        category.setGravity(Gravity.CENTER);//设置对其方式

        //设置单元格选择是背景色为透明，这样选择时就不现实黄色北京

        category.setSelector(new ColorDrawable(Color.TRANSPARENT));

        //根据单元格宽度和数目计算总宽度

        int width = mColumnWidthDip * categories.size();

        LayoutParams params = new LayoutParams(width, LayoutParams.FILL_PARENT);

        //更新category宽度和高度，这样category在一行显示

        category.setLayoutParams(params);

        //设置适配器

        category.setAdapter(categoryAdapter);

        //把category加入到容器中

        LinearLayout categoryList = (LinearLayout) findViewById(R.id.category_layout);

        categoryList.addView(category);

        //添加单元格点击事件

        category.setOnItemClickListener(new OnItemClickListener()

        {

            @Override

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

            {

                TextView categoryTitle;

                //恢复每个单元格背景色

                for (int i = 0; i < parent.getChildCount(); i++)

                {

                    categoryTitle = (TextView) (parent.getChildAt(i));

                    categoryTitle.setBackgroundDrawable(null);

                    categoryTitle.setTextColor(0XFFADB2AD);

                }

                //设置选择单元格的背景色

                categoryTitle = (TextView) (parent.getChildAt(position));

                categoryTitle.setBackgroundResource(R.drawable.categorybar_item_background);

                categoryTitle.setTextColor(0XFFFFFFFF);

                //获取选中的新闻分类id

                mCid = categories.get(position).get("category_title").getCid();

                mCatName = categories.get(position).get("category_title").getTitle();

                //获取该栏目下新闻

                //getSpeCateNews(mCid,mNewsData,0,true);

                //通知ListView进行更新

                //mNewsListAdapter.notifyDataSetChanged();

                loadNewsAsyncTask = new LoadNewsAsyncTask();

                loadNewsAsyncTask.execute(mCid,0,true);

            }

        });

        // 箭头

        final HorizontalScrollView categoryScrollview = (HorizontalScrollView) findViewById(R.id.category_scrollview);

        Button categoryArrowRight = (Button) findViewById(R.id.category_arrow_right);

        //点击箭头向左移动像素

        categoryArrowRight.setOnClickListener(new OnClickListener()

        {

            @Override

            public void onClick(View v)

            {

                categoryScrollview.fling(DensityUtil.px2dip(MainActivity.this, mFlingVelocityDip));

            }

        });

        //获取指定栏目的新闻列表

        //getSpeCateNews(mCid,mNewsData,0,true);

        mNewsListAdapter = new SimpleAdapter(this, mNewsData, R.layout.newslist_item,

                                        new String[]{"newslist_item_title","newslist_item_digest","newslist_item_source","newslist_item_ptime"},

                                        new int[]{R.id.newslist_item_title,R.id.newslist_item_digest,R.id.newslist_item_source,R.id.newslist_item_ptime});

        //添加页脚

        View loadMoreLayout = mInflater.inflate(R.layout.loadmore, null);

        mNewsList.addFooterView(loadMoreLayout);

        mNewsList.setAdapter(mNewsListAdapter);

        //点击新闻列表项，弹出新闻详细界面

        mNewsList.setOnItemClickListener(new OnItemClickListener()

        {

            @Override

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

            {

                Intent intent = new Intent(MainActivity.this, NewsDetailsActivity.class);

                //把需要的信息放到Intent中

                intent.putExtra("newsDate", mNewsData);

                intent.putExtra("position", position);

                intent.putExtra("categoryName", mCatName);

                startActivity(intent);

            }

        });

        mLoadMoreBtn = (Button)findViewById(R.id.loadmore_btn);

        mLoadMoreBtn.setOnClickListener(loadMoreListener);

        loadNewsAsyncTask = new LoadNewsAsyncTask();

        loadNewsAsyncTask.execute(mCid,0,true);

    }

    /**

     * 增加菜单

     */

    @Override

    public boolean onCreateOptionsMenu(Menu menu)

    {

        MenuInflater inflater = getMenuInflater();

        inflater.inflate(R.menu.menu_item, menu);

        return true;

    }

    /**

     * 处理菜单事件

     */

    @Override

    public boolean onOptionsItemSelected(MenuItem item)

    {

        if (item.getItemId()==R.id.menu_item_update)

        {

            UpdateManager manager = new UpdateManager(MainActivity.this);

            // 检查软件更新

            manager.checkUpdate();

        }

        return true;

    }

    /**

     * 获取指定类型的新闻列表

     * @param cid 类型ID

     * @param newsList 保存新闻信息的集合

     * @param startnid 分页

     * @param firstTimes    是否第一次加载

     */

    private int getSpeCateNews(int cid,List<HashMap<String, Object>> newsList,int startnid,Boolean firstTimes)

    {

        if (firstTimes)

        {

            //如果是第一次，则清空集合里数据

            newsList.clear();

        }

        //请求URL和字符串

        String url = "http://10.0.2.2:8080/web/getSpecifyCategoryNews";

        String params = "startnid="+startnid+"&count="+NEWSCOUNT+"&cid="+cid;

        SyncHttp syncHttp = new SyncHttp();

        try

        {

            //以Get方式请求，并获得返回结果

            String retStr = syncHttp.httpGet(url, params);

            JSONObject jsonObject = new JSONObject(retStr);

            //获取返回码，0表示成功

            int retCode = jsonObject.getInt("ret");

            if (0==retCode)

            {

                JSONObject dataObject = jsonObject.getJSONObject("data");

                //获取返回数目

                int totalnum = dataObject.getInt("totalnum");

                if (totalnum>0)

                {

                    //获取返回新闻集合

                    JSONArray newslist = dataObject.getJSONArray("newslist");

                    for(int i=0;i<newslist.length();i++)

                    {

                        JSONObject newsObject = (JSONObject)newslist.opt(i);

                        HashMap<String, Object> hashMap = new HashMap<String, Object>();

                        hashMap.put("nid", newsObject.getInt("nid"));

                        hashMap.put("newslist_item_title", newsObject.getString("title"));

                        hashMap.put("newslist_item_digest", newsObject.getString("digest"));

                        hashMap.put("newslist_item_source", newsObject.getString("source"));

                        hashMap.put("newslist_item_ptime", newsObject.getString("ptime"));

                        hashMap.put("newslist_item_comments", newsObject.getString("commentcount"));

                        newsList.add(hashMap);

                    }

                    return SUCCESS;

                }

                else

                {

                    if (firstTimes)

                    {

                        return NONEWS;

                    }

                    else

                    {

                        return NOMORENEWS;

                    }

                }

            }

            else

            {

                return LOADERROR;

            }

        } catch (Exception e)

        {

            e.printStackTrace();

            return LOADERROR;

        }

    }

    private OnClickListener loadMoreListener = new OnClickListener()

    {

        @Override

        public void onClick(View v)

        {

            loadNewsAsyncTask = new LoadNewsAsyncTask();

            switch (v.getId())

            {

            case R.id.loadmore_btn:

                //获取该栏目下新闻

                //getSpeCateNews(mCid,mNewsData,mNewsData.size(),false);

                //通知ListView进行更新

                //mNewsListAdapter.notifyDataSetChanged();

                loadNewsAsyncTask.execute(mCid,mNewsData.size(),false);

                break;

            case R.id.titlebar_refresh:

                loadNewsAsyncTask.execute(mCid,0,true);

                break;

            }

        }

    };

    private class LoadNewsAsyncTask extends AsyncTask<Object, Integer, Integer>

    {

        @Override

        protected void onPreExecute()

        {

            //隐藏刷新按钮

            mTitlebarRefresh.setVisibility(View.GONE);

            //显示进度条

            mLoadnewsProgress.setVisibility(View.VISIBLE);

            //设置LoadMore Button 显示文本

            mLoadMoreBtn.setText(R.string.loadmore_txt);

        }

        @Override

        protected Integer doInBackground(Object... params)

        {

            return getSpeCateNews((Integer)params[0],mNewsData,(Integer)params[1],(Boolean)params[2]);

        }

        @Override

        protected void onPostExecute(Integer result)

        {

            //根据返回值显示相关的Toast

            switch (result)

            {

            case NONEWS:

                Toast.makeText(MainActivity.this, R.string.no_news, Toast.LENGTH_LONG).show();

            break;

            case NOMORENEWS:

                Toast.makeText(MainActivity.this, R.string.no_more_news, Toast.LENGTH_LONG).show();

                break;

            case LOADERROR:

                Toast.makeText(MainActivity.this, R.string.load_news_failure, Toast.LENGTH_LONG).show();

                break;

            }

            mNewsListAdapter.notifyDataSetChanged();

            //显示刷新按钮

            mTitlebarRefresh.setVisibility(View.VISIBLE);

            //隐藏进度条

            mLoadnewsProgress.setVisibility(View.GONE);

            //设置LoadMore Button 显示文本

            mLoadMoreBtn.setText(R.string.loadmore_btn);

        }

    }

}

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