Terry's Blog 園地: [Android AppWidget]Taiwan Gold Price Widget 台灣地區銀樓即時黃金牌價

Android Home Screen App Widget 設計流程：

規劃App Widget的大小以及更新時間，在res/xml/裡新增一份XML文件，命名為 appwidget_provider.xml (可以自行命名)
規劃App Widget 的UI，修改 res/layout/main.xml
撰寫 App Widget 主程式
編輯 AndroidManifest.xml，設定 App Widget 的更新事件： android.appwidget.action.APPWIDGET_UPDATE

摘要說明，設計一個最基本的App Widget至少需要以下4個檔案：

res/xml/appwidget_provider.xml (可以自行命名)
res/layout/main.xml
src// App Widget 主程式.java
AndroidManifest.xml

<TWGoldGroupWidget.java> --- App Widget 主程式

   1: package com.android.twgoldgroupwidget;

2:

   3: import java.io.BufferedReader;

   4: import java.io.InputStreamReader;

   5: import java.net.HttpURLConnection;

   6: import java.net.URL;

   7: import java.util.Timer;

   8: import java.util.TimerTask;

9:

  10: import android.appwidget.AppWidgetManager;

  11: import android.appwidget.AppWidgetProvider;

  12: import android.content.ComponentName;

  13: import android.content.Context;

  14: import android.util.Log;

  15: import android.widget.RemoteViews;

  16: import android.widget.Toast;

17:

  18: public class TWGoldGroupWidget extends AppWidgetProvider {

19:

  20:     int start, end, counter;

  21:     URL url;

  22:     HttpURLConnection httpUrlconnection;

  23:     String TWGoldGroupWebURL = "http://www.gck99.com.tw/gold.asp";

  24:     String urlData, informationDate, askPrice, bidPrice, goldPrice;

  25:     RemoteViews remoteViews;

  26:     int appWidgetId;

27:

  28:     @Override

  29:     public void onDeleted(Context context, int[] appWidgetIds) {

  30:            Log.i("onDeleted", "OK");

  31:         Toast.makeText(context, "Gold Widget onDeleted()", Toast.LENGTH_LONG).show();

  32:     }

33:

34:

  35:     @Override

  36:     public void onDisabled(Context context) {

  37:         // 當最後一個  AppWidget 被刪除時，會執行 onDisabled

  38:         Log.i("onDisabled", "OK");

  39:         super.onDisabled(context);

  40:         android.os.Process.killProcess(android.os.Process.myPid());

  41:     }

42:

43:

  44:     @Override

  45:     public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {

  46:            Timer timer = new Timer();

  47:            timer.scheduleAtFixedRate(new MyTimerTask(context, appWidgetManager), 0, 3600000L);

  48:         super.onUpdate(context, appWidgetManager, appWidgetIds);

  49:     }

50:

51:

  52:     private class MyTimerTask extends TimerTask {

  53:         // MyTimerTask 定時執行動作

  54:         AppWidgetManager appWidgetManager;

  55:         RemoteViews remoteViews;

  56:         ComponentName thisWidget;

57:

  58:         public MyTimerTask(Context context, AppWidgetManager appWidgetManager) {

59:

  60:             Log.i("MyTimerTask","OK");

  61:             this.appWidgetManager = appWidgetManager;

  62:             remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);

  63:             thisWidget = new ComponentName(context, TWGoldGroupWidget.class);

64:

  65:         }

66:

  67:         public void run() {

  68:             // 顯示台灣地區銀樓即時黃金牌價

  69:             getTWGoldGroupResults();

  70:             remoteViews.setTextViewText(R.id.showTextView,

  71:                                         "台灣地區銀樓即時黃金牌價\n"+

  72:                                         "賣出　"+askPrice+"　元／台錢\n"+

  73:                                         "買進　"+bidPrice+"　元／台錢\n"+

  74:                                         informationDate);

  75:             appWidgetManager.updateAppWidget(thisWidget, remoteViews);

  76:         }

  77:     }

78:

79:

  80:     public void getTWGoldGroupResults() {

  81:           // 顯示台灣地區銀樓即時黃金牌價

  82:            // 讀取網頁資料，並將資料存放在於 urlData

  83:         urlData = GetURLData(TWGoldGroupWebURL , 20*1024);

  84:         // 剖析 urlData，擷取黃金存摺牌價資料

  85:         TWGoldGroupParser(urlData);

  86:     }

87:

88:

  89:     public String GetURLData(String WebURL, int ReadSize){

  90:            // 讀取網頁資料，並將資料存放在 urlData

  91:            urlData = null;

  92:            try {

  93:                url = new URL(WebURL);

  94:                httpUrlconnection = (HttpURLConnection) url.openConnection();

  95:                httpUrlconnection.setDoInput(true);

  96:                httpUrlconnection.setDoOutput(true);

  97:                httpUrlconnection.connect();

  98:                BufferedReader bufReader = new BufferedReader(

  99:                                            new InputStreamReader(httpUrlconnection.getInputStream()));

 100:                String decodedString;

 101:                while ((decodedString = bufReader.readLine()) != null) {

 102:                    urlData += decodedString;

 103:                    if (urlData.length() > ReadSize)

 104:                        break;

 105:                }

 106:                bufReader.close();

 107:                httpUrlconnection.disconnect();

 108:            }

 109:            catch(Exception e){

 110:                Log.e("ERROR", e.toString());

 111:            }

 112:            return urlData;

 113:     }

 114:

 115:

 116:     public void TWGoldGroupParser( String urlData ){

 117:         // 剖析 GCK urlData，擷取黃金牌價資料

 118:         String temp = null;

 119:         // 擷取【掛牌時間】

 120:         end = 0;

 121:         start =  urlData.indexOf("<font size=\"1\">", end+1);

 122:         end =  urlData.indexOf("</font>", start+1);

 123:         informationDate = urlData.substring(start+17, end);

 124:         // 擷取黃金牌價資料

 125:         end = 0;

 126:         for (counter = 1 ; counter <= 6 ; counter++)

 127:         {

 128:             start =  urlData.indexOf("font-size:9pt;", end+1);

 129:

 130:             switch (counter) {

 131:             case 3:

 132:                 end =  urlData.indexOf("</span>", start+1);

 133:                 temp = urlData.substring(start+19, end);

 134:                 askPrice = temp;

 135:                 break;

 136:

 137:             case 6:

 138:                 end =  urlData.indexOf("</span>", start+1);

 139:                 temp = urlData.substring(start+19, end);

 140:                 bidPrice = temp;

 141:                 break;

 142:

 143:             default:

 144:                 end =  start + 16;

 145:                 break;

 146:             }

 147:         }

 148:      }

 149:

 150: }

<main.xml> --- App Widget UI

   1: <?xml version="1.0" encoding="utf-8"?>

   2: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

   3:     android:layout_width="wrap_content"

   4:     android:layout_height="wrap_content"

   5:     android:background="@drawable/widget"

   6:     android:gravity="center"

   7:     android:orientation="vertical" >

8:

   9: <TextView

  10:     android:id="@+id/showTextView"

  11:     android:layout_width="wrap_content"

  12:     android:layout_height="wrap_content"

  13:     android:gravity="center"

  14:     android:text="@string/app_name"

  15:     android:textColor="@android:color/black"

  16:     android:textSize="11dp"

  17:     android:typeface="serif" />

18:

  19: </LinearLayout>

<appwidget.xml> --- 定義 appwidget-provider

   1: <?xml version="1.0" encoding="utf-8"?>

   2: <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"

   3:     android:minWidth="146dp"

   4:     android:minHeight="72dp"

   5:     android:initialLayout="@layout/main">

   6: </appwidget-provider>

<Android.Manifest.xml>

   1: <?xml version="1.0" encoding="utf-8"?>

   2: <manifest xmlns:android="http://schemas.android.com/apk/res/android"

   3:     package="com.android.twgoldgroupwidget"

   4:     android:versionCode="1"

   5:     android:versionName="1.0" android:installLocation="auto">

6:

   7:     <uses-sdk android:minSdkVersion="8" />

8:

   9:     <uses-permission android:name="android.permission.INTERNET"/>

10:

  11:     <application

  12:         android:icon="@drawable/gold"

  13:         android:label="@string/app_name" >

  14:                 <receiver android:name=".TWGoldGroupWidget" >

  15:                     <intent-filter>

  16:                         <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />

  17:                     </intent-filter>

  18:                     <meta-data android:name="android.appwidget.provider"

  19:                             android:resource="@xml/appwidget" />

  20:                 </receiver>

  21:     </application>

22:

  23: </manifest>

Terry's Blog 園地

2012年4月20日星期五

[Android AppWidget]Taiwan Gold Price Widget 台灣地區銀樓即時黃金牌價

沒有留言:

張貼留言

2012年4月20日 星期五

[Android AppWidget]Taiwan Gold Price Widget 台灣地區銀樓即時黃金牌價

沒有留言:

張貼留言

2012年4月20日星期五