Android之高仿墨迹天气桌面组件(AppWidgetProvider)

相信墨迹天气,大家都见过,他在时间显示和天气界面上,很吸引人,今天我就来模仿一下墨迹天气的桌面组件,但是由于谷歌在天朝频频被墙的缘故,所以我在今天测试的时候,解析xml文件的网页打不开,所以天气显示出了点问题,希望大家能理解,谢谢。(今天9月24日修改为解析中国天气网获取天气了,而且修改组件在桌面居中显示)。

老规矩,先分享源代码:http://download.csdn.net/detail/weidi1989/4597809

好了,废话不多说,先上效果图:

再来看一下整个小项目的主体结构:

首先先声明一个桌面布局的xml文件,即app.xml:






然后要在manifest文件中声明:



    

    

    
        
        

        
            
            
            
            
                
            
        

        
        
    

主要代码:

一:定义一个App类继承AppWidgetProvider,然后再onUpdate方法中启动一个服务去更新时间和天气。

/**
 * @author way
 */
public class App extends AppWidgetProvider {
	private Intent intent;

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		intent = new Intent(context, UpdateService.class);
		context.startService(intent);
		super.onUpdate(context, appWidgetManager, appWidgetIds);
	}

	@Override
	public void onDeleted(Context context, int[] appWidgetIds) {
		context.stopService(intent);
		super.onDeleted(context, appWidgetIds);
	}
}


二:本项目中最重要的部分,在这个服务中,我们注册一个广播接收者去接受系统每分钟时间时间变化的广播,从而来更新桌面时间,这样更省电哦,需要注意的是:这个广播接收者必须在代码中注册,在Manifest文件中注册是没有效果的。更新天气,我是通过定义一个定时器,由用户设置时间间隔来更新天气信息。

package com.way.apptest;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import android.app.AlertDialog;
import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.widget.RemoteViews;

import com.way.getWeather.MyWeather;

/**
 * @author way
 */
public class UpdateService extends Service {
	private static final int UPDATE = 0x123;
	private RemoteViews remoteViews;
	// 数字时间图片资源数组
	private int[] imgs = { R.drawable.n0, R.drawable.n1, R.drawable.n2,
			R.drawable.n3, R.drawable.n4, R.drawable.n5, R.drawable.n6,
			R.drawable.n7, R.drawable.n8, R.drawable.n9, };
	// 将显示小时、分钟的ImageView定义成数组
	private int[] dateViews = { R.id.h1, R.id.h2, R.id.m1, R.id.m2 };
	// 按照中国天气网的天气图片顺序排列好本地资源图片,我这里是随意的~嘿嘿
	private int[] weatherImg = { R.drawable.sunny, R.drawable.cloudy,
			R.drawable.chance_of_rain, R.drawable.chance_of_sleet,
			R.drawable.chance_of_snow, R.drawable.chance_of_storm,
			R.drawable.clock1, R.drawable.fog, R.drawable.haze,
			R.drawable.mist, R.drawable.mostly_sunny, R.drawable.mostly_cloudy,
			R.drawable.lower, R.drawable.middle };
	private Handler handler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			switch (msg.what) {
			case UPDATE:
				// 更新天气
				updateTime();
				updateWeather();
				break;
			}
		}
	};
	// 广播接收者去接收系统每分钟的提示广播,来更新时间
	private BroadcastReceiver mTimePickerBroadcast = new BroadcastReceiver() {

		@Override
		public void onReceive(Context context, Intent intent) {
			updateTime();
		}
	};

	private void updateWeather() {
		// Weather w = new GetWeather().googleWeather();
		// if (w != null) {
		// System.out.println("当前天气:" + w.getWeather() + ":" + w.getTemp_c()
		// + ":" + w.getIcon());
		remoteViews.setTextViewText(R.id.condition, MyWeather.weather1);
		remoteViews.setTextViewText(R.id.tem, (MyWeather.temp1));
		// 根据图片名,获取天气图片资源
		// remoteViews.setImageViewResource(
		// R.id.weather,
		// getApplicationContext().getResources().getIdentifier(
		// w.getIcon(), "drawable", "com.way.apptest"));
		if (MyWeather.img1 != null || !"".equals(MyWeather.img1)) 
			remoteViews.setImageViewResource(R.id.weather,
					weatherImg[Integer.parseInt(MyWeather.img1)]);
		// 执行更新
		ComponentName componentName = new ComponentName(
				getApplicationContext(), App.class);
		AppWidgetManager.getInstance(getApplicationContext()).updateAppWidget(
				componentName, remoteViews);
	}

	@Override
	public IBinder onBind(Intent intent) {
		return null;
	}

	@Override
	public void onCreate() {
		super.onCreate();
		remoteViews = new RemoteViews(getApplication().getPackageName(),
				R.layout.main);// 实例化RemoteViews
		if (isNetworkAvailable()) {
			MyWeather.getWeather();// json解析中国天气网天气
		} else {
			toast();
		}
		updateTime();// 第一次运行时先更新一下时间和天气
		updateWeather();
		// 点击天气图片,进入MainActivity
		Intent intent = new Intent(getApplicationContext(), MainActivity.class);
		PendingIntent pi = PendingIntent.getActivity(getApplicationContext(),
				0, intent, 0);
		remoteViews.setOnClickPendingIntent(R.id.weather, pi);

		// 定义一个定时器去更新天气。实际开发中更新时间间隔可以由用户设置,
		new Timer().scheduleAtFixedRate(new TimerTask() {
			@Override
			public void run() {
				Message msg = handler.obtainMessage();
				msg.what = UPDATE;
				handler.sendMessage(msg);
			}
		}, 1, 3600 * 1000);// 每小时更新一次天气
	}

	private void updateTime() {
		Date date = new Date();
		// 定义SimpleDateFormat对象
		SimpleDateFormat df = new SimpleDateFormat("HHmm");
		// 将当前时间格式化成HHmm的形式
		String timeStr = df.format(date);

		for (int i = 0; i < timeStr.length(); i++) {
			// 将第i个数字字符转换为对应的数字
			int num2 = Integer.parseInt(timeStr.substring(i, i + 1));
			// 将第i个图片的设为对应的数字图片
			remoteViews.setImageViewResource(dateViews[i], imgs[num2]);
		}
		remoteViews.setTextViewText(R.id.city, MyWeather.city);
		remoteViews.setTextViewText(R.id.date, "0" + (date.getMonth() + 1)
				+ "-" + date.getDate() + " 周" + date.getDay());
		ComponentName componentName = new ComponentName(getApplication(),
				App.class);
		AppWidgetManager.getInstance(getApplication()).updateAppWidget(
				componentName, remoteViews);
	}

	@Override
	public void onStart(Intent intent, int startId) {
		// 注册系统每分钟提醒广播(注意:这个广播只能在代码中注册)
		IntentFilter updateIntent = new IntentFilter();
		updateIntent.addAction("android.intent.action.TIME_TICK");
		registerReceiver(mTimePickerBroadcast, updateIntent);
		super.onStart(intent, startId);
	}

	@Override
	public void onDestroy() {
		// 注销系统的这个广播
		unregisterReceiver(mTimePickerBroadcast);
		//被系统干掉后,服务重启,做一次流氓软件,哈哈
		Intent intent = new Intent(getApplicationContext(), UpdateService.class);
		getApplication().startService(intent); 
		super.onDestroy();
	}

	/**
	 * 判断手机网络是否可用
	 * 
	 * @param context
	 * @return
	 */
	private boolean isNetworkAvailable() {
		ConnectivityManager mgr = (ConnectivityManager) getApplicationContext()
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo[] info = mgr.getAllNetworkInfo();
		if (info != null) {
			for (int i = 0; i < info.length; i++) {
				if (info[i].getState() == NetworkInfo.State.CONNECTED) {
					return true;
				}
			}
		}
		return false;
	}

	private void toast() {
		new AlertDialog.Builder(getApplicationContext())
				.setTitle("提示")
				.setMessage("网络连接未打开")
				.setPositiveButton("前往打开",
						new DialogInterface.OnClickListener() {

							public void onClick(DialogInterface dialog,
									int which) {
								Intent intent = new Intent(
										android.provider.Settings.ACTION_WIRELESS_SETTINGS);
								startActivity(intent);
							}
						}).setNegativeButton("取消", null).create().show();
	}
}



三:这是桌面组件主要布局文件,如果大家有什么好的建议,欢迎提,本人对布局不是特别擅长。




    

        

            

            
        

        

        

            

            
        
    

    

        

            

            
        

        

        

            

            
        
    


四:谷歌天气不给力,所以我就简单的给出获取天气的核心代码。这里简单的做了一下乱码处理。

 * @author way
 * 
 */
public class GetWeather {
	/**
	 * 
	 * @return 天气对象
	 */
	public Weather googleWeather() {
		String str = "http://www.google.com/ig/api?hl=zh_cn&weather=shenzhen";
		try {
			URL url = new URL(str);
			InputStream in = url.openStream();
			ByteArrayOutputStream bos = new ByteArrayOutputStream();
			int len = -1;
			while ((len = in.read()) != -1) {
				bos.write(len);
			}
			InputStream is = new ByteArrayInputStream(bos.toString("GBK")
					.getBytes("utf-8"));
			// 从流中获取文档到本地内存
			Document doc = DocumentBuilderFactory.newInstance()
					.newDocumentBuilder().parse(is);
			// 从文档中得到名字为current_conditions的第一个节点下的所有子节点(一个集合)
			NodeList nodeList = doc.getElementsByTagName("current_conditions")
					.item(0).getChildNodes();
			// 得到nodeList下第一个节点的第一个元素内容(即当前天气)
			String condition = nodeList.item(0).getAttributes().item(0)
					.getNodeValue();
			// 当前温度
			String temp_c = nodeList.item(2).getAttributes().item(0)
					.getNodeValue();
			// 当前湿度
//			String humidity = nodeList.item(3).getAttributes().item(0)
//					.getNodeValue();
			// 当前图片路径
			String iconPath = nodeList.item(4).getAttributes().item(0)
					.getNodeValue();
			// 当前风向
//			String wind_condition = nodeList.item(5).getAttributes().item(0)
//					.getNodeValue();
			Weather w = new Weather();
			w.setWeather(condition);
			w.setTemp_c(temp_c);
			// 从图片路径中获取图片的名字
			String icon = iconPath.substring(iconPath.lastIndexOf("/") + 1,
					iconPath.indexOf("."));
			w.setIcon(icon);
			return w;
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		}
		return null;
	}
}

今天再修改解析中国天气网的json代码:

public class MyWeather {
	public static String city;
	public static String temp1;
	public static String weather1;
	public static String img1;

	public static void getWeather() {
		try {
			URL url = new URL("http://m.weather.com.cn/data/101250101.html");
			InputStream is = url.openStream();
			ByteArrayOutputStream bos = new ByteArrayOutputStream();
			int len = -1;
			byte[] buffer = new byte[1024];
			while ((len = is.read(buffer)) != -1) {
				bos.write(buffer, 0, len);
			}
			String info = bos.toString("utf-8");
			JSONObject dataJson = new JSONObject(info);
			JSONObject json = dataJson.getJSONObject("weatherinfo");
			city = json.getString("city");
			temp1 = json.getString("temp1");
			weather1 = json.getString("weather1");
			img1 = json.getString("img1");
			System.out.println(city);is.close();bos.close();
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (JSONException e) {
			e.printStackTrace();
		}
	}

}

好了,大功告成,这是发表第三遍了,前两次都是悲剧,哎,不知道是网络问题还是我电脑问题,提交没有反应。总之很蛋疼!

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