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。
* @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!