天气预报

mainactivity的代码如下所示：

package com.example.weather;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.sql.Connection;import java.util.ArrayList;import org.json.JSONObject;import org.w3c.dom.Text;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.graphics.drawable.AnimationDrawable;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.text.TextUtils;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;public class MainActivity extends Activity {private ImageView refreshImageView;private ImageView searchImageView;private TextView cityTextView;private TextView pmTextView;private TextView tempertureTextView;private TextView weatherTextView;private TextView dateTextView;private TextView netWorkErrorTextView;private View pmStateColorView;private LinearLayout futureDayWeatherListLayout;private AnimationDrawable refreshAnimation;        private int cityCode;        private SharedPreferences sharePrefrences;private Handler netWorkFinishHandler = new Handler() {public void handleMessage(Message msg) {//网络请求结束所以停掉动画refreshAnimationStop();// handleMessage 先区分不同的消息if (msg.what == 404) {netWorkErrorTextView.setText((String)msg.obj);return;}if (msg.what == 100) {// 网络请成功，数据解析完成WeatherBean weatherBean = (WeatherBean) msg.obj;cityTextView.setText(weatherBean.getCityName());pmTextView.setText("PM:" + weatherBean.getPm() + "\r\r"+ weatherBean.getPmLevel());netWorkErrorTextView.setText("");tempertureTextView.setText(weatherBean.getTemperture() + "℃");weatherTextView.setText(weatherBean.getWeather() + "\r\r"+ weatherBean.getWind() + "\r\r"+ weatherBean.getWindLevel());dateTextView.setText(weatherBean.getDateY()+ weatherBean.getWeek());setPmColor(weatherBean.getPmLevel());setFutureDayWeather(weatherBean.getFutureWeatherList());//获取sharePrefrences文件的编辑Editor editor = sharePrefrences.edit();//向编辑中添加一个键为cityCode的键值对并调用commit()方法写入到文件中editor.putInt("cityCode", cityCode).commit();}}private void setFutureDayWeather(ArrayList<FutureWeatherBean> futureWeatherList) {// 在向容器型控件添加布局时要先清空容器型控件futureDayWeatherListLayout.removeAllViews();for (int i = 0; i < futureWeatherList.size(); i++) {FutureWeatherBean futureWeatherBean = futureWeatherList.get(i);// 创建一个显示未来某天的布局/* * 把一个布局代码转化为View控件 * 通过布局转换器LayoutInflater对象的inflate(R.layout.futureday_layout, * null)方法 获取LayoutInflater的对象用LayoutInflater的from( * getApplicationContext() )静态方法来获取 */View futureDayLayout = LayoutInflater.from(getApplicationContext()).inflate(R.layout.futureday_layout, null);// 从futureDayLayout中找到相关控件TextView futureWeekTextView = (TextView) futureDayLayout.findViewById(R.id.future_week_tv);TextView futureWeatherTextView = (TextView) futureDayLayout.findViewById(R.id.future_weather_tv);TextView futureTempertureTextView = (TextView) futureDayLayout.findViewById(R.id.future_temperture_tv);// 给相关控件赋值futureTempertureTextView.setText(futureWeatherBean.getTemperture());futureWeatherTextView.setText(futureWeatherBean.getWeather()+ futureWeatherBean.getWind());futureWeekTextView.setText(futureWeatherBean.getWeek());// 把赋值完成的布局加载到横向ScrollView的布局中去futureDayWeatherListLayout.addView(futureDayLayout);}}private void setPmColor(String pmLevel) {if (pmLevel.contains(getResources().getString(R.string.best))) {pmStateColorView.setBackgroundColor(getResources().getColor(R.color.green));} else if (pmLevel.contains(getResources().getString(R.string.better))) {pmStateColorView.setBackgroundColor(getResources().getColor(R.color.yellow));} else if (pmLevel.contains(getResources().getString(R.string.pollution))) {pmStateColorView.setBackgroundColor(getResources().getColor(R.color.orange));} else if (pmLevel.contains(getResources().getString(R.string.mpollution))) {pmStateColorView.setBackgroundColor(getResources().getColor(R.color.red));} else if (pmLevel.contains(getResources().getString(R.string.spollution))) {pmStateColorView.setBackgroundColor(getResources().getColor(R.color.violet));} else {pmStateColorView.setBackgroundColor(getResources().getColor(R.color.brown));}};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//获取sharePrefrences文件sharePrefrences = getSharedPreferences("weather", Context.MODE_PRIVATE);//从sharePrefrences文件中取出键为cityCode的值，如果sharePrefrences文件中没有键为cityCode的值，参数二为默认值cityCode = sharePrefrences.getInt("cityCode", 101010100);findViews();setLisenter();getWeatherDataFromNetWork();}    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {    super.onActivityResult(requestCode, resultCode, data);    //区分那个页面的返回值    if (requestCode == 300) {//保存resultCode的值，resultCode就是搜索到的城市的Id    cityCode = resultCode;    getWeatherDataFromNetWork();}    }    private void setLisenter() {refreshImageView.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {getWeatherDataFromNetWork();}});searchImageView.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {               Intent intent = new Intent(MainActivity.this, SearchCityCodeActivity.class);             //startActivityForResult(intent, 300);反向传值调用的启动Activity的方式             //参数二用于区分不同Activity的返回结果               startActivityForResult(intent, 300);}});}private void findViews() {refreshImageView = (ImageView) findViewById(R.id.refresh_img);searchImageView = (ImageView) findViewById(R.id.search_img);cityTextView = (TextView) findViewById(R.id.city_tv);pmTextView = (TextView) findViewById(R.id.pm_tv);pmStateColorView = findViewById(R.id.pm_color_v);tempertureTextView = (TextView) findViewById(R.id.temperture_tv);weatherTextView = (TextView) findViewById(R.id.weather_tv);dateTextView = (TextView) findViewById(R.id.date_tv);netWorkErrorTextView = (TextView) findViewById(R.id.network_error_tv);futureDayWeatherListLayout = (LinearLayout) findViewById(R.id.futureday_weather_layout);}private void getWeatherDataFromNetWork() {ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo netWorkInfo = manager.getActiveNetworkInfo();if (netWorkInfo == null) {netWorkErrorTextView.setText("网络异常，请检查网络");return;}refreshAnimationStart();new Thread(new Runnable() {@Overridepublic void run() {// 网络请求要先给出网址String urlString = "http://weather.123.duba.net/static/weather_info/"+cityCode+".html";// StringBuffer可变字符串 用于保存网络请求的结果StringBuffer stringBuffer = new StringBuffer();// 异常捕获建议把catch中的异常放大到所有的异常try {  String resultString = NetWorkUtils.doGet(urlString);// 异常处理resultString为空的情况if (TextUtils.isEmpty(resultString)) {// netWorkErrorTextView.setText("未请求到数据，请刷新");netWorkRequestError("网络加载异常，请重新加载");return;}// 确定请求到的数据包含天气信息if (!resultString.contains("weather_callback")) {netWorkRequestError("网络加载异常，请重新加载");return;}WeatherBean weatherBean = new WeatherBean(resultString);System.out.println(weatherBean.toString());getWeatherDataSuccess(weatherBean);} catch (Exception e) {e.printStackTrace();netWorkRequestError("网络加载异常，请重新加载");}}private void getWeatherDataSuccess(WeatherBean weatherBean) {Message message = new Message();// message.what 是给这个消息设置一个唯一标识，handleMessage()中区分不同的消息message.what = 100;// message.obj 是保存要展示的数据对象，用于主线程刷新UImessage.obj = weatherBean;// 通过handler对象的sendMessage()发送通知给主线程netWorkFinishHandler.sendMessage(message);}}).start();}private void netWorkRequestError(String errorString){Message message = new Message();message.what = 404;message.obj = errorString;netWorkFinishHandler.sendMessage(message);}// 开启动画的方法private void refreshAnimationStart() {// 把动画资源设为refreshImage的背景refreshImageView.setBackgroundResource(R.drawable.pb_bg);// 从refreshImage上把动画资源取到refreshAnimation = (AnimationDrawable) refreshImageView.getBackground();// 启动动画资源refreshAnimation.start();// 当动画开启式，refreshImageView设为不可点击状态refreshImageView.setEnabled(false);}   //动画停止的方法private void refreshAnimationStop(){//停止动画refreshAnimation.stop();//把刷新按钮的图片放到refreshImageView上refreshImageView.setBackgroundResource(R.drawable.refresh);//使refreshImageView可点击refreshImageView.setEnabled(true);}}

searchcitycodeactivity.java

package com.example.weather;import java.io.InputStream;import java.util.HashMap;import java.util.Set;import org.apache.http.params.HttpAbstractParamBean;import org.apache.http.protocol.HTTP;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import org.xmlpull.v1.XmlPullParserFactory;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.text.TextUtils;import android.view.View;import android.view.View.OnClickListener;import android.widget.ArrayAdapter;import android.widget.AutoCompleteTextView;import android.widget.ImageView;public class SearchCityCodeActivity extends Activity {private AutoCompleteTextView searchCityCodeAutoCompleteTextView;private ImageView searchFinishImageView;private HashMap<String, String> cityNameKeyCityCodeValueHashMap;private Handler readXMLFinishHandler = new Handler() {public void handleMessage(Message msg) {setAutoCompleteTextViewAdapter();}private void setAutoCompleteTextViewAdapter() {Set<String> cityNameSet = cityNameKeyCityCodeValueHashMap.keySet();String[] cityNames = new String[cityNameSet.size()];cityNameSet.toArray(cityNames);ArrayAdapter<String> adapter = new ArrayAdapter<String>(SearchCityCodeActivity.this,android.R.layout.simple_list_item_1, cityNames);searchCityCodeAutoCompleteTextView.setAdapter(adapter);searchCityCodeAutoCompleteTextView.setThreshold(1);};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_search_city_code);findViews();setListener();getCityCityCodeFromXML();}private void setListener() {searchFinishImageView.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String cityName = searchCityCodeAutoCompleteTextView.getText().toString().trim();//异常处理if (TextUtils.isEmpty(cityName)) {searchCityCodeAutoCompleteTextView.setError("请输入城市名称");return;}String cityCodeString = cityNameKeyCityCodeValueHashMap.get(cityName);    if (TextUtils.isEmpty(cityCodeString)) {    searchCityCodeAutoCompleteTextView.setError("没有此城市的相关信息");    return;}    int cityCode = Integer.valueOf(cityCodeString);    setResult(cityCode);    finish();}  });}private void getCityCityCodeFromXML() {try {// 先要把assets文件夹中的city_code.xml读取到代码中final InputStream cityCityCodeInputStream = getAssets().open("city_code.xml");// 解析XML文件是耗时性工作，所以要放到后台线程中去执行，而不是在主线程中readCityCodeXML(cityCityCodeInputStream);} catch (Exception e) {e.printStackTrace();}}private void readCityCodeXMLFinish() {Message message = new Message();message.what = 100;readXMLFinishHandler.sendMessage(message);}private void readCityCodeXML(final InputStream cityCityCodeInputStream) {new Thread(new Runnable() {@Overridepublic void run() {try {// 初始化hashMap对象cityNameKeyCityCodeValueHashMap = new HashMap<String, String>();// 创建解析器工厂XmlPullParserFactory factory = XmlPullParserFactory.newInstance();// 解析器工厂生产解析器对象XmlPullParser parser = factory.newPullParser();// 给解析器对象配置数据流和数据编码方式parser.setInput(cityCityCodeInputStream, HTTP.UTF_8);// 先获取第一个标签的事件类型int evenType = parser.getEventType();// 循环判断标签是否为总的结束标签while (evenType != XmlPullParser.END_TAG) {if (evenType == XmlPullParser.START_TAG) {// 获取当前标签的名字String name = parser.getName();// 如果标签的名字为key说明该标签的值为cityNameif (name.equals("key")) {// 取到标签后的值指针移动到cityNameString cityNameKey = parser.nextText();// 指针移动到</key>parser.next();// 指针移动到<string>parser.next();// 取到cityCodeString cityCodeValue = parser.nextText();cityNameKeyCityCodeValueHashMap.put(cityNameKey, cityCodeValue);}}// 获取下个节点用于循环执行parser.next();// 获取下一个节点标签的事件类型用于判断是否结束循环evenType = parser.getEventType();}readCityCodeXMLFinish();System.out.println(cityNameKeyCityCodeValueHashMap.toString());} catch (Exception e) {e.printStackTrace();}}}).start();}private void findViews() {searchCityCodeAutoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.search_citycode_actv);searchFinishImageView = (ImageView) findViewById(R.id.seach_finish_img);}}

package com.example.weather;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import android.text.TextUtils;public  class NetWorkUtils {     public static String doGet(String urlString){     String resultString = "";     StringBuffer stringBuffer = new StringBuffer();     try {URL url = new URL(urlString);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setConnectTimeout(10 * 1000);connection.setReadTimeout(10 * 1000);InputStream inputStream = connection.getInputStream();InputStreamReader inputStreamReader = new InputStreamReader(inputStream);BufferedReader bufferedReader = new BufferedReader(inputStreamReader);String readLineString = bufferedReader.readLine();while (!TextUtils.isEmpty(readLineString)) {stringBuffer.append(readLineString);readLineString = bufferedReader.readLine();}    resultString = stringBuffer.toString();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}     return resultString;          }}

以上是提起预报实现的部分代码。

具体的实验效果如下图所示：