<?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" ><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="50dp"android:background="#484E61" ><Buttonandroid:id="@+id/close_weather"android:layout_width="30dp"android:layout_height="30dp"android:layout_centerVertical="true"android:layout_marginLeft="10dp"android:background="@drawable/home" /><TextViewandroid:id="@+id/city_name"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:textColor="#fff"android:textSize="24sp" /><Buttonandroid:id="@+id/refresh_weather"android:layout_width="30dp"android:layout_height="30dp"android:layout_alignParentRight="true"android:layout_centerVertical="true"android:layout_marginRight="10dp"android:background="@drawable/refresh" /></RelativeLayout><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:background="#27A5F9" ><TextViewandroid:id="@+id/publish_text"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentRight="true"android:layout_marginRight="10dp"android:layout_marginTop="10dp"android:textColor="#FFF"android:textSize="18sp" /><LinearLayoutandroid:id="@+id/weather_info_layout"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:orientation="vertical" ><TextViewandroid:id="@+id/current_date"android:layout_width="wrap_content"android:layout_height="40dp"android:gravity="center"android:textColor="#FFF"android:textSize="18sp" /><TextViewandroid:id="@+id/weather_desp"android:layout_width="wrap_content"android:layout_height="60dp"android:layout_gravity="center_horizontal"android:gravity="center"android:textColor="#FFF"android:textSize="40sp" /><LinearLayoutandroid:layout_width="wrap_content"android:layout_height="60dp"android:layout_gravity="center_horizontal"android:orientation="horizontal" ><TextViewandroid:id="@+id/temp1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:textColor="#FFF"android:textSize="40sp" /><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:layout_marginLeft="10dp"android:layout_marginRight="10dp"android:text="~"android:textColor="#FFF"android:textSize="40sp" /><TextViewandroid:id="@+id/temp2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:textColor="#FFF"android:textSize="40sp" /></LinearLayout></LinearLayout></RelativeLayout></LinearLayout>

   2.在res/drawable-hdpi文件夹中添加两张按钮图片home.png和refresh.png
   3.MainActivity.java

public class MainActivity extends Activity implements OnClickListener {//自定义变量private TextView cityNameText;       //用于显示城市名private TextView publishText;        //用于显示发布时间private TextView weatherDespText;    //用于显示天气描述信息private TextView temp1Text;          //用于显示最低气温private TextView temp2Text;          //用于显示最高气温private TextView currentDateText;    //用于显示当前日期private Button closeWeather;         //退出程序private Button refreshWeather;       //更新天气按钮private String weatherCode;          //天气代码private String weatherJson;          //获取JSON格式@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);//获取对象cityNameText = (TextView) findViewById(R.id.city_name);publishText = (TextView) findViewById(R.id.publish_text);weatherDespText = (TextView) findViewById(R.id.weather_desp);temp1Text = (TextView) findViewById(R.id.temp1);temp2Text = (TextView) findViewById(R.id.temp2);currentDateText = (TextView) findViewById(R.id.current_date);closeWeather = (Button) findViewById(R.id.close_weather);refreshWeather = (Button) findViewById(R.id.refresh_weather);//主活动 implements OnClickListenercloseWeather.setOnClickListener(this);refreshWeather.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.close_weather:finish();break;case R.id.refresh_weather:DialogChooseCity();break;default:break;}}/*** 自定义对话框 获取城市* 中国天气网 * http://www.weather.com.cn/data/cityinfo/101010100.html*/private void DialogChooseCity() {//创建对话框AlertDialog.Builder  builder = new AlertDialog.Builder(MainActivity.this);builder.setTitle("请选择一个城市");builder.setIcon(android.R.drawable.ic_dialog_info);//指定下拉列表的显示数据final String[] cities = {"北京", "上海", "天津", "广州", "贵阳", "台北", "香港"};final String[] codes = {"101010100", "101020100", "101030100","101280101","101260101", "101340101", "101320101"};builder.setItems(cities, new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){weatherCode = codes[which];//执行线程访问http//否则 NetworkOnMainThreadExceptionnew Thread(new Runnable() {@Overridepublic void run() {//访问中国天气网String weatherUrl = "http://www.weather.com.cn/data/cityinfo/"+ weatherCode + ".html";weatherJson = queryStringForGet(weatherUrl);//JSON格式解析try {JSONObject jsonObject = new JSONObject(weatherJson);JSONObject weatherObject = jsonObject.getJSONObject("weatherinfo");Message message = new Message();message.obj = weatherObject;handler.sendMessage(message);} catch (JSONException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}).start();}});builder.show();}/*** 解析Json格式数据并显示*/@SuppressLint("HandlerLeak")Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubsuper.handleMessage(msg);JSONObject object = (JSONObject) msg.obj;try {cityNameText.setText(object.getString("city"));temp1Text.setText(object.getString("temp1"));temp2Text.setText(object.getString("temp2"));weatherDespText.setText(object.getString("weather"));publishText.setText("今天"+object.getString("ptime")+"发布");//获取当前日期SimpleDateFormat sdf = new SimpleDateFormat("yyyy年M月d日", Locale.CHINA);currentDateText.setText(sdf.format(new Date()));} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}};/*** 网络查询*/private String queryStringForGet(String url) {HttpGet request = new HttpGet(url);String result = null;try {HttpResponse response = new DefaultHttpClient().execute(request);if (response.getStatusLine().getStatusCode() == 200) {result = EntityUtils.toString(response.getEntity(), HTTP.UTF_8);return result;}} catch (ClientProtocolException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return result;}}

    4.最后在AndroidManifest.xml中声明网络权限

<!-- 申请权限 -->
<uses-permission android:name="android.permission.INTERNET" />

   5.运行效果如下图所示

   6.需要注意几点
(1)在访问http或获取上传网络数据时,你可能会遇到错误导致程序崩溃,即错误NetworkOnMainThreadException.你需要自定义线程实现,通过:

 new Thread(new Runnable() {@Overridepublic void run() {//具体操作....}}).start();

   (2)当从网上获取JSON格式数据后,你需要学会JSONObject将数据解析出来.同时如果可能与数据库进行操作,存入db数据库中.
    (3)如果可能通过自定义DBHelper(继承自SQLiteOpenHelper)和DBManager获取静态数据库中数据,查看对应城市或县份的天气代码.但是重新移植数据库总是报错"no such table:city_table".但是明明存在,可能是数据库路径"/data/data/包名/databases/mydata.db"定义或引用错误,仍未解决.
    通过SQLiteSpy软件打开db文件,很明显存在city_table表和数据.如下图所示:

public static String getWeather(String city){   String result=null;String url="http://php.weather.sina.com.cn/iframe/index/w_cl.php?code=js&day=2&city="+city+"&dfc=3";try{   DefaultHttpClient client = getDefaultHttpClient2();   HttpGet mothod = new HttpGet(url);   HttpResponse httpResponse = client.execute(mothod);if (httpResponse.getStatusLine().getStatusCode() == 200)  {  result = EntityUtils.toString(httpResponse.getEntity(),"gb2312");  }  }catch(Exception ex){   ex.printStackTrace();   }   return result;
}  

   而天气图片是通过res/drawable文件夹下静态图片显示,该方法也介绍下!

private int imageResoId(String weather){int resoid=R.drawable.s_2;if(weather.indexOf("多云")!=-1||weather.indexOf("晴")!=-1){//多云转晴，以下类同 indexOf:包含字串resoid=R.drawable.s_1;}else if(weather.indexOf("多云")!=-1&&weather.indexOf("阴")!=-1){resoid=R.drawable.s_2;}else if(weather.indexOf("阴")!=-1&&weather.indexOf("雨")!=-1){resoid=R.drawable.s_3;}else if(weather.indexOf("晴")!=-1&&weather.indexOf("雨")!=-1){resoid=R.drawable.s_12;}else if(weather.indexOf("晴")!=-1&&weather.indexOf("雾")!=-1){resoid=R.drawable.s_12;}else if(weather.indexOf("晴")!=-1){resoid=R.drawable.s_13;}else if(weather.indexOf("多云")!=-1){resoid=R.drawable.s_2;}else if(weather.indexOf("阵雨")!=-1){resoid=R.drawable.s_3;}else if(weather.indexOf("小雨")!=-1){resoid=R.drawable.s_3;}else if(weather.indexOf("中雨")!=-1){resoid=R.drawable.s_4;}else if(weather.indexOf("大雨")!=-1){resoid=R.drawable.s_5;}else if(weather.indexOf("暴雨")!=-1){resoid=R.drawable.s_5;}else if(weather.indexOf("冰雹")!=-1){resoid=R.drawable.s_6;}else if(weather.indexOf("雷阵雨")!=-1){resoid=R.drawable.s_7;}else if(weather.indexOf("小雪")!=-1){resoid=R.drawable.s_8;}else if(weather.indexOf("中雪")!=-1){resoid=R.drawable.s_9;}else if(weather.indexOf("大雪")!=-1){resoid=R.drawable.s_10;}else if(weather.indexOf("暴雪")!=-1){resoid=R.drawable.s_10;}else if(weather.indexOf("扬沙")!=-1){resoid=R.drawable.s_11;}else if(weather.indexOf("沙尘")!=-1){resoid=R.drawable.s_11;}else if(weather.indexOf("雾")!=-1){resoid=R.drawable.s_12;}return resoid;
}

   其中自定义对话框输入AlertDialog,载入weather_other_city.xml布局仅有一个输入框ExitText控件.通过Intent传参至显示天气的界面.具体代码如下.

//输入城市名
private void showOtherCity() {LayoutInflater inflater = getLayoutInflater();View layout = inflater.inflate(R.layout.weather_other_city,(ViewGroup) findViewById(R.id.ws_dialog));dialogCity = (EditText)layout.findViewById(R.id.ws_city_name);//创建对话框new AlertDialog.Builder(this).setTitle("请输入城市名称").setView(layout).setPositiveButton("确定",new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int id) {cityName = dialogCity.getText().toString();Intent intent = new Intent(MainActivity.this, WeatherScreen.class);intent.putExtra("extra_data", cityName);startActivity(intent);}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog, int id) {dialog.cancel();}}).show();
}

   由于新浪方法类似,所以就简述了些其他如显示静态图片和AlertDialog的知识.
   最后简单总结下吧!第一种方法主要通过中国天气网显示信息,其核心是获取天气代码WeatherCode,然后访问URL获取JSON格式数据并显示.第二种方法仅仅是传入城市名称(不要传错),然后获取JSON数据显示天气即可.最后希望文章对大家有所帮助,如果有错误或不足之处,还请海涵~
(By:Eastmount 2014-12-18 晚9点http://blog.csdn.net/eastmount/)