android 天气预报实例

【实例截图】

【核心代码】

package com.weather.app;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.json.JSONException;
import org.json.JSONObject;
import com.weather.utils.WebAccessTools;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.util.Log;
import android.widget.RemoteViews;

public class WeatherWidget extends AppWidgetProvider {
	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		super.onUpdate(context, appWidgetManager, appWidgetIds);
		
		//这样在第一次运行时也能响应用户的单击事件
		getWeatherView(context);
		
		//启动一个自定义更新widget的后台服务
		context.startService(new Intent(context,UpdateWidgetService.class));
	}
	
	@Override //当删除最后一个Widget组件后调用
	public void onDisabled(Context context) {
		super.onDisabled(context);
		//关闭后台服务
		context.stopService(new Intent(context,UpdateWidgetService.class));
	}

	//返回widget中的布局视图对象
	public static RemoteViews getWeatherView(Context context){
		RemoteViews views=new RemoteViews(context.getPackageName(), R.layout.widget_layout);
		
		//当击widget的主体来启动MainActivity返回到天气精灵的天气显示界面
		Intent intent = new Intent(context, MainActivity.class);
		PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
		views.setOnClickPendingIntent(R.id.weather_rootLayout, pendingIntent);
		
		return views;
	}
	
	public static void updateAppWidget(RemoteViews views, Context context, 
			AppWidgetManager appWidgetManager, String cityCode) {
		
		SharedPreferences shared = context.getSharedPreferences(MainActivity.STORE_WEATHER, MainActivity.MODE_PRIVATE);
		long currentTime = System.currentTimeMillis();
		//得到天气缓冲文件中的有效期
		long vaildTime = shared.getLong("validTime", currentTime);
		//比较天气缓存文件中的有效期，如果超时了，则访问网络更新天气
		if(vaildTime <= currentTime)
			updateWeather(views, context, cityCode);
		else
			updateWeather(views, context);
		
		//更新时间
		Date date = new Date();
		SimpleDateFormat foramt = new SimpleDateFormat("hh:mm");
		String timeText = foramt.format(date);
		Log.i("widget", "===================update  time======" timeText "=====================");
		views.setTextViewText(R.id.widget_time , timeText);
	}

	//由缓存文件来得到天气信息
	public static void updateWeather(RemoteViews views, Context context) {
		SharedPreferences sp = context.getSharedPreferences(MainActivity.STORE_WEATHER,MainActivity.MODE_PRIVATE);
		
		String info=sp.getString("city", "");
		views.setTextViewText(R.id.widget_city, info);
		
		info=sp.getString("date_y", "");
		views.setTextViewText(R.id.widget_data01, info);
		
		info= sp.getString("temp1", "");
		views.setTextViewText(R.id.widget_temp, info);
		
		info= sp.getString("weather1", "");
		views.setTextViewText(R.id.widget_weather, info);
		
		views.setImageViewResource(R.id.widget_icon, sp.getInt("img_title1", R.drawable.weathericon_condition_17));
	}
	
	//从网络中更新天气文件和views中的显示数据
	public static void updateWeather(RemoteViews views, Context context, String cityCode) {
		//由城市码更新天气
		StringBuffer str = new StringBuffer("http://m.weather.com.cn/data/");
		str.append(cityCode);
		str.append(".html");
		try {
			String info =new WebAccessTools(context).getWebContent(str.toString());
			JSONObject json=new JSONObject(info).getJSONObject("weatherinfo");
			int weather_icon = 0;
			
			//建立一个缓存天气的文件
			SharedPreferences.Editor editor = context.getSharedPreferences(MainActivity.STORE_WEATHER,
					MainActivity.MODE_PRIVATE).edit();
			
			//得到城市
			info=json.getString("city");
			editor.putString("city", info);
			
			views.setTextViewText(R.id.widget_city, info);
			
			//得到阳历日期
			info= json.getString("date_y") ;
			info= info "(" json.getString("week") ")";
			editor.putString("date_y", info);
			
			views.setTextViewText(R.id.widget_data01, info);
			
			//得到农历
			info= json.getString("date");
			editor.putString("date", info);
			//得到温度
			info= json.getString("temp1");
			editor.putString("temp1", info);
			
			views.setTextViewText(R.id.widget_temp, info);
			//得到天气
			info= json.getString("weather1");
			editor.putString("weather1", info);
			
			views.setTextViewText(R.id.widget_weather, info);
			//天气图标
			info= json.getString("img_title1");
			weather_icon = MainActivity.getWeatherBitMapResource(info);
			editor.putInt("img_title1", weather_icon);
			
			views.setImageViewResource(R.id.widget_icon, weather_icon);
			//得到风向
			info= json.getString("wind1");
			editor.putString("wind1", info);
			//得到建议
			info= json.getString("index_d");
			editor.putString("index_d", info);
			
			//得到明天的天气
			info= json.getString("weather2");
			editor.putString("weather2", info);
			//明天的图标
			info= json.getString("img_title2");
			weather_icon = MainActivity.getWeatherBitMapResource(info);
			editor.putInt("img_title2", weather_icon);
			//明天的气温
			info= json.getString("temp2");
			editor.putString("temp2", info);
			//明天的风力
			info= json.getString("wind2");
			editor.putString("wind2", info);
			
			//后天的天气
			info= json.getString("weather3");
			editor.putString("weather3", info);
			//后天天气图标
			info= json.getString("img_title3");
			weather_icon = MainActivity.getWeatherBitMapResource(info);
			editor.putInt("img_title3", weather_icon);
			//后天的气温
			info= json.getString("temp3");
			editor.putString("temp3", info);
			//后天的风力
			info= json.getString("wind3");
			editor.putString("wind3", info);
			
			//设置一个有效日期为5小时
			long validTime = System.currentTimeMillis();
			validTime = validTime   5*60*60*1000;
			editor.putLong("validTime", validTime);
			
			//保存
			editor.commit();
		}catch(JSONException e) {
			e.printStackTrace();
		}
	}
}