参考http://blog.youkuaiyun.com/wwj_748/article/category/1342194
新闻客户端的做法。
准备不采用上文中的子布局news_category_name_layout.xml，而是用GridView代替，在MainActivity.java中的onCreate中添加函数initHSV，代码如下：
package com.newsdemo.app;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.newsdemo.app.custom.ConstomSimpleAdapter;
import com.newsdemo.app.utils.HttpCallbackListener;
import com.newsdemo.app.utils.HttpUtil;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnItemClickListener
{
private ListView listView;
private TextView textView;
private List<CategoryItem> dataList=new ArrayList<CategoryItem>();
private CategoryItemAdapter adapter;
private static final int SHOW_RESPONSE=0;
private TextView responseText;
private View tempView;
private LinearLayout ll;
private HorizontalScrollView hsv;
private ProgressDialog progressDialog;
//新闻类型
private String[] categoryList={"头条","社会","国内","国际"
,"娱乐","体育","军事","科技","财经","时尚"};
private Map<String,String> categoryCode=new HashMap<String,String>();
//对控件的设置需要在主线程中进行
private Handler handler=new Handler()
{
public void handleMessage(Message msg)
{
switch(msg.what)
{
case SHOW_RESPONSE:
//在这里进行UI操作
String response=(String)msg.obj;
responseText.setText(response);
parseJSONWithJSONObject(response);
break;
}
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
initData();
responseText=(TextView) findViewById(R.id.response_text);
listView=(ListView) findViewById(R.id.list_view);
textView=(TextView) findViewById(R.id.title_name);
progressDialog= ProgressDialog.show(MainActivity.this,
"请稍等", "正在下载数据...", true);
textView.setText("MyNews");
tempView=LayoutInflater.from(this).
inflate(R.layout.news_category_layout, null);
ll=(LinearLayout) tempView.findViewById(R.id.news_category);
hsv=(HorizontalScrollView) tempView.findViewById(R.id.news_horizontalSV);
/* <strong>for(int i=0;i<categoryList.length;++i)
{
View view=LayoutInflater.from(this).
inflate(R.layout.news_category_name_layout, null);
TextView txt=(TextView) view.findViewById(R.id.news_category_name);
txt.setText(categoryList[i]);
ll.addView(view);
}</strong>*/
<span style="background-color: rgb(255, 0, 0);">initHSV();</span>
listView.addHeaderView(tempView,null,false);
adapter=new CategoryItemAdapter(this,R.layout.title_item_layout,dataList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
//默认启动时是头条top新闻
String category="top";
//发出请求
String address="http://v.juhe.cn/toutiao/index?type=top&key=bad7cfabe911c929d7fbae195d1ee49c";
sendRequest(address);
hsv.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, v.getId(), Toast.LENGTH_SHORT).show();
}
});
}
/**
* 初始化数据
*/
private void initData()
{
if(categoryCode.isEmpty())
{
categoryCode.put("头条", "top");
categoryCode.put("社会", "shehui");
categoryCode.put("国内", "guonei");
categoryCode.put("国际", "guoji");
categoryCode.put("娱乐", "yule");
categoryCode.put("体育", "tiyu");
categoryCode.put("军事", "junshi");
categoryCode.put("科技", "keji");
categoryCode.put("财经", "caijing");
categoryCode.put("时尚", "shishang");
}
}
/**
* 初始化HorizontalScrollView控件
*/
private void initHSV()
{
// 定义一个List数组，用来存放HashMap对象
final List<HashMap<String, String>> categories =
new ArrayList<HashMap<String, String>>();
for(String s:categoryList)
{
HashMap<String, String> hashMap = new HashMap<String, String>();
hashMap.put("category_title", s);
categories.add(hashMap);
}
final ConstomSimpleAdapter categoryAdapter = new ConstomSimpleAdapter(this,
categories, R.layout.name_layout,
new String[] { "category_title" },
new int[] { R.id.name });
// 创建一个网格视图, 用于实现新闻标题的布局
GridView category = new GridView(this);
// 设置单元格的背景色为透明，这样选择分类时就不会显示黄色背景了
category.setSelector(new ColorDrawable(Color.TRANSPARENT));
// 设置每一个新闻标题的宽度
category.setColumnWidth(100);
// 设置网格视图的列数
category.setNumColumns(GridView.AUTO_FIT);
// 设置对齐方式
category.setGravity(Gravity.CENTER);
// 根据单元格的宽度和数目计算网格视图的宽度
int width =100 * categories.size();
// 获取布局参数
LayoutParams params = new LayoutParams(width, LayoutParams.MATCH_PARENT);
// 设置参数
category.setLayoutParams(params);
// 设置Adapter
category.setAdapter(categoryAdapter);
// 将网格视图组件添加到LinearLayout布局当中
ll.addView(category);
// 添加单元格点击事件
category.setOnItemClickListener(new OnItemClickListener() {
TextView categoryTitle;
public void onItemClick(AdapterView<?> parent, View view,
int position, long id)
{
for (int i = 0; i < parent.getCount(); i++)
{
categoryTitle = (TextView) parent.getChildAt(i);
categoryTitle.setTextColor(0XFFADB2AD);
categoryTitle.setBackgroundDrawable(null);
}
categoryTitle = (TextView) view;
categoryTitle.setTextColor(0xFFFFFFFF);
categoryTitle
.setBackgroundResource(R.drawable.image_categorybar_item_selected_background);
categoryAdapter.setSeclection(position);
categoryAdapter.notifyDataSetChanged();
Toast.makeText(MainActivity.this, categoryTitle.getText(), Toast.LENGTH_SHORT).show();
final String newAddress="http://v.juhe.cn/toutiao/index?type="+categoryCode.get(categoryTitle.getText())
+"&key=bad7cfabe911c929d7fbae195d1ee49c";
//final ProgressDialog progressDialog = ProgressDialog.show(MainActivity.this,
// "请稍等", "正在下载数据...", true);
sendRequest(newAddress);
progressDialog.onStart();
/*new Thread()
{
@Override
public void run()
{
sendRequest(newAddress);
progressDialog.dismiss(); // 关闭进度条对话框
}
}.start();*/
}
});
}
/**
* 发送网络请求
* @param address
*/
private void sendRequest(String address)
{
HttpUtil.sendHttpRequest(address, new HttpCallbackListener()
{
public void onFinish(String response)//收到数据
{
Message message=new Message();
message.what=SHOW_RESPONSE;
//将服务器返回的结果存储到message中
message.obj=response.toString();
handler.sendMessage(message);
}
public void onError(Exception e)
{
runOnUiThread(new Runnable()
{
public void run()
{
Toast.makeText(MainActivity.this,
"获取数据失败", Toast.LENGTH_SHORT).show();
}
});
}
});
}
/**
* 解析JSON数据
* @param jsonData
*/
private void parseJSONWithJSONObject(String jsonData)
{
try
{
//数据清空
//dataList.clear();
if(!dataList.isEmpty())
{
//新建适配器
dataList=new ArrayList<CategoryItem>();
adapter=new CategoryItemAdapter(this,R.layout.title_item_layout,dataList);
listView.setAdapter(adapter);
}
JSONObject jsonObject=new JSONObject(jsonData);
//按关键字查找result
JSONObject result=jsonObject.getJSONObject("result");
//按关键字查找data
String data=result.getString("data");
//根据data的数据成立数据，进行提取
JSONArray jsonArray=new JSONArray(data);
int sum=jsonArray.length();
for(int i=0;i<jsonArray.length();++i)
{
//重要信息的提取
JSONObject jsonObject2=jsonArray.getJSONObject(i);
String title=jsonObject2.getString("title");
String date=jsonObject2.getString("date");
String author_name=jsonObject2.getString("author_name");
String urlAdd=jsonObject2.getString("url");
//String type=jsonObject2.getString("realtype");
CategoryItem tempCate=new CategoryItem(author_name,date,title,urlAdd);
dataList.add(tempCate);
}
adapter.notifyDataSetChanged();
listView.setSelection(0);
progressDialog.dismiss();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
*点击ListView时候的响应
* @param parent
* @param view
* @param position
* @param id
*/
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
//因为在ListView之前加了addHeaderView，故点击的时候位置会+1，故要相应地-1
CategoryItem tempCategoryItem=dataList.get(position-1);
String urlAddress=tempCategoryItem.getNewsUrl();
Intent intent=new Intent(this,NewsDetailActivity.class);
intent.putExtra("URL", urlAddress);
startActivity(intent);
}
}
package com.newsdemo.app.custom;
import java.util.List;
import java.util.Map;
import com.newsdemo.app.R;
import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class ConstomSimpleAdapter extends SimpleAdapter
{
private int clickTemp = -1;
private int clickTemp2 = -1;
public ConstomSimpleAdapter(Context context,
List<? extends Map<String, ?>> data, int resource, String[] from,
int[] to) {
super(context, data, resource, from, to);
// TODO Auto-generated constructor stub
}
public void setSeclection(int position)
{
clickTemp = position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View v = super.getView(position, convertView, parent);
// 更新第一个TextView的背景
//if(position == 0)
if(clickTemp2==-1)//为了使高度合适，故如此设计一个
{
TextView categoryTitle = (TextView) v;
categoryTitle.setBackgroundResource(R.drawable.image_categorybar_item_selected_background);
//categoryTitle.setTextColor(0xFFFFFFFF);
}
if(clickTemp==position)//点击选项时变红色
{
TextView categoryTitle = (TextView) v;
categoryTitle.setBackgroundResource(R.drawable.image_categorybar_item_selected_background);
categoryTitle.setTextColor(Color.RED);
}
return v;
}
}
可实现简单的新闻浏览效果：
ListView中的Item的高度还需要调整下.
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