今天我们要写一下Android Widget的开发，由于快点凌晨，我就不说的太具体了，同志们就模仿吧！首先看一下效果图: 下面是Demo的详细步骤: 一、新建一个Android工程命名为:WidgetDemo. 二、准备素材，一个是Widget的图标，一个是Widget的背景。存放目录如下图: 三、修改string.xml文件如下: 
        
                
  1. viewplaincopytoclipboardprint? 
    2.             
  2. <?xmlversion="1.0"encoding="utf-8"?> 
    3.             
  3. <resources> 
    4.             
  4. <stringname="hello">HelloWorld,WidetDemo!</string> 
    5.             
  5. <stringname="app_name">DaysToWorldCup</string> 
    6.             
  6. </resources> 
    7.             
  7. <?xmlversion="1.0"encoding="utf-8"?>
    8.             
  8. <resources>
    9.             
  9. <stringname="hello">HelloWorld,WidetDemo!</string>
    10.             
  10. <stringname="app_name">DaysToWorldCup</string>
    11.             
  11. </resources>
    12.
四、建立Widget内容提供者文件，我们在res下建立xml文件夹，并且新建一个widget_provider.xml代码入下: 
        
                
  1. viewplaincopytoclipboardprint? 
    2.             
  2. <?xmlversion="1.0"encoding="utf-8"?> 
    3.             
  3. <appwidget-providerxmlns:android="http://schemas.android.com/apk/res/android" 
    4.             
  4. android:minWidth="50dip" 
    5.             
  5. android:minHeight="50dip" 
    6.             
  6. android:updatePeriodMillis="10000" 
    7.             
  7. android:initialLayout="@layout/main" 
    8.             
  8. /> 
    9.             
  9. <?xmlversion="1.0"encoding="utf-8"?>
    10.             
  10. <appwidget-providerxmlns:android="http://schemas.android.com/apk/res/android"
    11.             
  11. android:minWidth="50dip"
    12.             
  12. android:minHeight="50dip"
    13.             
  13. android:updatePeriodMillis="10000"
    14.             
  14. android:initialLayout="@layout/main"
    15.             
  15. /> 
    16.
五、修改main.xml布局，代码如下: 
        
                
  1. viewplaincopytoclipboardprint? 
    2.             
  2. <?xmlversion="1.0"encoding="utf-8"?> 
    3.             
  3. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" 
    4.             
  4. android:orientation="vertical" 
    5.             
  5. android:layout_width="fill_parent" 
    6.             
  6. android:layout_height="fill_parent" 
    7.             
  7. android:background="@drawable/wordcup" 
    8.             
  8. > 
    9.             
  9. <TextView 
    10.             
  10. android:id="@+id/wordcup" 
    11.             
  11. android:layout_width="fill_parent" 
    12.             
  12. android:layout_height="wrap_content" 
    13.             
  13. android:text="@string/hello" 
    14.             
  14. android:textSize="12px" 
    15.             
  15. android:textColor="#ff0000" 
    16.             
  16. /> 
    17.             
  17. </LinearLayout> 
    18.             
  18. <?xmlversion="1.0"encoding="utf-8"?> 
    19.             
  19. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
    20.             
  20. android:orientation="vertical"
    21.             
  21. android:layout_width="fill_parent"
    22.             
  22. android:layout_height="fill_parent"
    23.             
  23. android:background="@drawable/wordcup"
    24.             
  24. > 
    25.             
  25. <TextView 
    26.             
  26. android:id="@+id/wordcup"
    27.             
  27. android:layout_width="fill_parent" 
    28.             
  28. android:layout_height="wrap_content" 
    29.             
  29. android:text="@string/hello"
    30.             
  30. android:textSize="12px"
    31.             
  31. android:textColor="#ff0000"
    32.             
  32. /> 
    33.             
  33. </LinearLayout> 
    34.             
  34.  
    35.             
  35. 六、修改WidgetDemo.java代码如下: 
    36.             
  36. viewplaincopytoclipboardprint? 
    37.             
  37. packagecom.android.tutor; 
    38.             
  38. importjava.util.Calendar; 
    39.             
  39. importjava.util.Date; 
    40.             
  40. importjava.util.GregorianCalendar; 
    41.             
  41. importjava.util.Timer; 
    42.             
  42. importjava.util.TimerTask; 
    43.             
  43. importandroid.appwidget.AppWidgetManager; 
    44.             
  44. importandroid.appwidget.AppWidgetProvider; 
    45.             
  45. importandroid.content.ComponentName; 
    46.             
  46. importandroid.content.Context; 
    47.             
  47. importandroid.widget.RemoteViews; 
    48.             
  48. publicclassWidetDemoextendsAppWidgetProvider{ 
    49.             
  49. /**Calledwhentheactivityisfirstcreated.*/ 
    50.             
  50.  
    51.             
  51. @Override 
    52.             
  52. publicvoidonUpdate(Contextcontext,AppWidgetManagerappWidgetManager, 
    53.             
  53. int[]appWidgetIds){ 
    54.             
  54.  
    55.             
  55. Timertimer=newTimer(); 
    56.             
  56. timer.scheduleAtFixedRate(newMyTime(context,appWidgetManager),1,60000); 
    57.             
  57. super.onUpdate(context,appWidgetManager,appWidgetIds); 
    58.             
  58. } 
    59.             
  59.  
    60.             
  60.  
    61.             
  61. privateclassMyTimeextendsTimerTask{ 
    62.             
  62. RemoteViewsremoteViews; 
    63.             
  63. AppWidgetManagerappWidgetManager; 
    64.             
  64. ComponentNamethisWidget; 
    65.             
  65.  
    66.             
  66. publicMyTime(Contextcontext,AppWidgetManagerappWidgetManager){ 
    67.             
  67. this.appWidgetManager=appWidgetManager; 
    68.             
  68. remoteViews=newRemoteViews(context.getPackageName(),R.layout.main); 
    69.             
  69.  
    70.             
  70. thisWidget=newComponentName(context,WidetDemo.class); 
    71.             
  71. } 
    72.             
  72. publicvoidrun(){ 
    73.             
  73.  
    74.             
  74. Datedate=newDate(); 
    75.             
  75. Calendarcalendar=newGregorianCalendar(2010,06,11); 
    76.             
  76. longdays=(((calendar.getTimeInMillis()-date.getTime())/1000))/86400; 
    77.             
  77. remoteViews.setTextViewText(R.id.wordcup,"距离南非世界杯还有"+days+"天"); 
    78.             
  78. appWidgetManager.updateAppWidget(thisWidget,remoteViews); 
    79.             
  79.  
    80.             
  80. } 
    81.             
  81.  
    82.             
  82. } 
    83.             
  83.  
    84.             
  84. } 
    85.             
  85. packagecom.android.tutor; 
    86.             
  86. importjava.util.Calendar; 
    87.             
  87. importjava.util.Date; 
    88.             
  88. importjava.util.GregorianCalendar; 
    89.             
  89. importjava.util.Timer; 
    90.             
  90. importjava.util.TimerTask; 
    91.             
  91. importandroid.appwidget.AppWidgetManager; 
    92.             
  92. importandroid.appwidget.AppWidgetProvider; 
    93.             
  93. importandroid.content.ComponentName; 
    94.             
  94. importandroid.content.Context; 
    95.             
  95. importandroid.widget.RemoteViews; 
    96.             
  96. publicclassWidetDemoextendsAppWidgetProvider{ 
    97.             
  97. /**Calledwhentheactivityisfirstcreated.*/
    98.             
  98.  
    99.             
  99. @Override
    100.             
  100. publicvoidonUpdate(Contextcontext,AppWidgetManagerappWidgetManager, 
    101.             
  101. int[]appWidgetIds){ 
    102.             
  102.  
    103.             
  103. Timertimer=newTimer(); 
    104.             
  104. timer.scheduleAtFixedRate(newMyTime(context,appWidgetManager),1,60000); 
    105.             
  105. super.onUpdate(context,appWidgetManager,appWidgetIds); 
    106.             
  106. } 
    107.             
  107.  
    108.             
  108.  
    109.             
  109. privateclassMyTimeextendsTimerTask{ 
    110.             
  110. RemoteViewsremoteViews; 
    111.             
  111. AppWidgetManagerappWidgetManager; 
    112.             
  112. ComponentNamethisWidget; 
    113.             
  113.  
    114.             
  114. publicMyTime(Contextcontext,AppWidgetManagerappWidgetManager){ 
    115.             
  115. this.appWidgetManager=appWidgetManager; 
    116.             
  116. remoteViews=newRemoteViews(context.getPackageName(),R.layout.main); 
    117.             
  117.  
    118.             
  118. thisWidget=newComponentName(context,WidetDemo.class); 
    119.             
  119. } 
    120.             
  120. publicvoidrun(){ 
    121.             
  121.  
    122.             
  122. Datedate=newDate(); 
    123.             
  123. Calendarcalendar=newGregorianCalendar(2010,06,11); 
    124.             
  124. longdays=(((calendar.getTimeInMillis()-date.getTime())/1000))/86400; 
    125.             
  125. remoteViews.setTextViewText(R.id.wordcup,"距离南非世界杯还有"+days+"天"); 
    126.             
  126. appWidgetManager.updateAppWidget(thisWidget,remoteViews); 
    127.             
  127.  
    128.             
  128. } 
    129.             
  129.  
    130.             
  130. } 
    131.             
  131.  
    132.             
  132. } 
    133.
七、修改配置文件AndroidManifest.xml，代码如下: 
        
                
  1. viewplaincopytoclipboardprint? 
    2.             
  2. <?xmlversion="1.0"encoding="utf-8"?> 
    3.             
  3. <manifestxmlns:android="http://schemas.android.com/apk/res/android" 
    4.             
  4. package="com.android.tutor" 
    5.             
  5. android:versionCode="1" 
    6.             
  6. android:versionName="1.0"> 
    7.             
  7. <applicationandroid:icon="@drawable/icon"android:label="@string/app_name"> 
    8.             
  8. <receiverandroid:name=".WidetDemo" 
    9.             
  9. android:label="@string/app_name"> 
    10.             
  10. <intent-filter> 
    11.             
  11. <actionandroid:name="android.appwidget.action.APPWIDGET_UPDATE"/> 
    12.             
  12. </intent-filter> 
    13.             
  13. <meta-dataandroid:name="android.appwidget.provider" 
    14.             
  14. android:resource="@xml/widget_provider" 
    15.             
  15. /> 
    16.             
  16. </receiver> 
    17.             
  17. </application> 
    18.             
  18. <uses-sdkandroid:minSdkVersion="7"/> 
    19.             
  19. </manifest> 
    20.             
  20. <?xmlversion="1.0"encoding="utf-8"?>
    21.             
  21. <manifestxmlns:android="http://schemas.android.com/apk/res/android"
    22.             
  22. package="com.android.tutor"
    23.             
  23. android:versionCode="1"
    24.             
  24. android:versionName="1.0">
    25.             
  25. <applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
    26.             
  26. <receiverandroid:name=".WidetDemo"
    27.             
  27. android:label="@string/app_name">
    28.             
  28. <intent-filter>
    29.             
  29. <actionandroid:name="android.appwidget.action.APPWIDGET_UPDATE"/>
    30.             
  30. </intent-filter>
    31.             
  31. <meta-dataandroid:name="android.appwidget.provider"
    32.             
  32. android:resource="@xml/widget_provider"
    33.             
  33. />
    34.             
  34. </receiver>
    35.             
  35. </application>
    36.             
  36. <uses-sdkandroid:minSdkVersion="7"/>
    37.             
  37. </manifest> 
    38.
八、点击运行(Ctrl+F11),之，运行成功后，我们长时间点击桌面，会出现如下俩个，依次点击，就可以看到最上面的效果图: 今天就到这里了，我困了呵呵，我发现时间好像不对劲，lol~我也不去多想了，大家知道的告诉我下!对日历这些东西不是太了解，谢谢!!

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