Android 类似未读短信图标显示数字效果的分析

效果图:

 实现过程分析

Intent.java(系统增加3个常量)

frameworks/base/core/java/android/content/Intent.java

Java代码  

1. //状态     
2. public static final String MTK_ACTION_UNREAD_CHANGED = "com.mediatek.action.UNREAD_CHANGED";  
3. //应用名称      
4. public static final String MTK_EXTRA_UNREAD_COMPONENT = "com.mediatek.intent.extra.UNREAD_COMPONENT";  
5. //数量  
6. public static final String MTK_EXTRA_UNREAD_NUMBER = "com.mediatek.intent.extra.UNREAD_NUMBER";  
7.    

 

系统里面有这个功能几个应用相关的代码路径

日历 packages/apps/Calendar/src/com/mediatek/calendar/MTKUtils.java

邮件 :packages/apps/Email/src/com/android/email/NotificationController.java

电话 :packages/providers/ContactsProvider/src/com/android/providers/contacts/CallLogProvider.java  

短信 :packages/providers/TelephonyProvider/src/com/android/providers/telephony/MmsSmsProvider.java

这里以电话为例:

假设当前有人打电话进来,系统会保存改记录到数据库,根据事件是否已经处理来判断是否发送广播

CallLogProvider.java(发送有待处理事件的广播)

packages/providers/ContactsProvider/src/com/android/providers/contacts/CallLogProvider.java

Java代码  

1. /** M: send new Calls broadcast to luancher to update unread icon @{ */  
2.     public static final void notifyNewCallsCount(SQLiteDatabase db, Context context) {  
3.         Cursor c = null;  
4.        …..  
5.         //send count=0 to clear the unread icon  
6.         if (newCallsCount >= 0) { //有新的来电数量  
7.             Intent newIntent = new Intent(Intent.MTK_ACTION_UNREAD_CHANGED);  
8.             newIntent.putExtra(Intent.MTK_EXTRA_UNREAD_NUMBER, newCallsCount);  
9.             newIntent.putExtra(Intent.MTK_EXTRA_UNREAD_COMPONENT, new ComponentName(Constants.CONTACTS_PACKAGE,  
10.                     Constants.CONTACTS_DIALTACTS_ACTIVITY));  
11.             context.sendBroadcast(newIntent); //发送对应的广播  
12.             android.provider.Settings.System.putInt(context.getContentResolver(), Constants.CONTACTS_UNREAD_KEY, Integer  
13.                     .valueOf(newCallsCount));  
14.         }  
15.     }  

 MTKUnreadLoader.java(Launcher接收到应用发送的广播,进行判断改应用是否可以显示有未处理事件的图标)

packages/apps/Launcher2/src/com/android/launcher2/MTKUnreadLoader.java

Java代码  

1. public void onReceive(final Context context, final Intent intent) {  
2.         final String action = intent.getAction();  
3.             //过滤广播  
4.         if (Intent.MTK_ACTION_UNREAD_CHANGED.equals(action)) {  
5.             final ComponentName componentName = (ComponentName) intent.getExtra(Intent.MTK_EXTRA_UNREAD_COMPONENT);  
6.             final int unreadNum = intent.getIntExtra(Intent.MTK_EXTRA_UNREAD_NUMBER, -1);  
7.   
8.             if (mCallbacks != null && componentName != null && unreadNum != -1) {  
9.                 //判断是否支持该功能  
10.                 final int index = supportUnreadFeature(componentName);  
11.                 if (index >= 0) { //支持  
12.                     boolean ret = setUnreadNumberAt(index, unreadNum);  
13.                     if (ret) {  
14.                         final UnreadCallbacks callbacks = mCallbacks.get();  
15.                         if (callbacks != null) {  
16.                             callbacks.bindComponentUnreadChanged(componentName, unreadNum);  
17.                         }  
18.                     .........  
19.     }  

 LauncherApplication.java(Launcher注册对应的广播接收器)

packages/apps/Launcher2/src/com/android/launcher2/LauncherApplication.java

Java代码  

1. public void onCreate() {  
2.        ........  
3.         /// M: register unread broadcast.  
4.         if (FeatureOption.MTK_LAUNCHER_UNREAD_SUPPORT) {  
5.             mUnreadLoader = new MTKUnreadLoader(getApplicationContext());  
6.             // Register unread change broadcast.  
7.             filter = new IntentFilter();  
8.             filter.addAction(Intent.MTK_ACTION_UNREAD_CHANGED);  
9.             registerReceiver(mUnreadLoader, filter); //注册对应的广播接收器  
10.         }  
11.        ..............  
12.     }  

 MTKUnreadLoader.java(处理应用的图标显示未处理事件的数字)

packages/apps/Launcher2/src/com/android/launcher2/MTKUnreadLoader.java

Java代码  

1. static void drawUnreadEventIfNeed(Canvas canvas, View icon) {  
2.         ItemInfo info = (ItemInfo)icon.getTag();  
3.         if (info != null && info.unreadNum > 0) { //判断未处理事件数量  
4.             Resources res = icon.getContext().getResources();  
5.            ..........  
6.             if (info.unreadNum > Launcher.MAX_UNREAD_COUNT) {  
7.                 unreadTextNumber = String.valueOf(Launcher.MAX_UNREAD_COUNT);  
8.                 unreadTextPlusPaint.getTextBounds(unreadTextPlus, 0, unreadTextPlus.length(), unreadTextPlusBounds);  
9.             } else {  
10.                 unreadTextNumber = String.valueOf(info.unreadNum);  
11.             }  
12.             unreadTextNumberPaint.getTextBounds(unreadTextNumber, 0, unreadTextNumber.length(), unreadTextNumberBounds);  
13.             int textHeight = unreadTextNumberBounds.height();  
14.             int textWidth = unreadTextNumberBounds.width() + unreadTextPlusBounds.width();  
15.   
16.             // 数字的背景图  
17.             NinePatchDrawable unreadBgNinePatchDrawable = (NinePatchDrawable)res.getDrawable(R.drawable.ic_newevents_numberindication);  
18.            .........  
19.             Rect unreadBgBounds = new Rect(0, 0, unreadBgWidth, unreadBgHeight);  
20.             unreadBgNinePatchDrawable.setBounds(unreadBgBounds);  
21.   
22.             int unreadMarginTop = 0;  
23.             int unreadMarginRight = 0;  
24.             if (info instanceof ShortcutInfo) { //workspace 里面的快捷方式  
25.                 if (info.container == (long)LauncherSettings.Favorites.CONTAINER_HOTSEAT) {  
26.                     unreadMarginTop = (int)res.getDimension(R.dimen.hotseat_unread_margin_top);  
27.                     unreadMarginRight = (int)res.getDimension(R.dimen.hotseat_unread_margin_right);  
28.                 } else if (info.container == (long)LauncherSettings.Favorites.CONTAINER_DESKTOP) {  
29.                     unreadMarginTop = (int)res.getDimension(R.dimen.workspace_unread_margin_top);  
30.                     unreadMarginRight = (int)res.getDimension(R.dimen.workspace_unread_margin_right);  
31.                 } else {  
32.                     unreadMarginTop = (int)res.getDimension(R.dimen.folder_unread_margin_top);  
33.                     unreadMarginRight = (int)res.getDimension(R.dimen.folder_unread_margin_right);  
34.                 }  
35.             } else if (info instanceof FolderInfo) { //文件夹  
36.                 if (info.container == (long)LauncherSettings.Favorites.CONTAINER_HOTSEAT) {  
37.                     unreadMarginTop = (int)res.getDimension(R.dimen.hotseat_unread_margin_top);  
38.                     unreadMarginRight = (int)res.getDimension(R.dimen.hotseat_unread_margin_right);  
39.                 } else if (info.container == (long)LauncherSettings.Favorites.CONTAINER_DESKTOP) {  
40.                     unreadMarginTop = (int)res.getDimension(R.dimen.workspace_unread_margin_top);  
41.                     unreadMarginRight = (int)res.getDimension(R.dimen.workspace_unread_margin_right);  
42.                 }  
43.             }  
44.             else if (info instanceof ApplicationInfo) { //all app 里面的应用icon  
45.                 unreadMarginTop = (int)res.getDimension(R.dimen.app_list_unread_margin_top);  
46.                 unreadMarginRight = (int)res.getDimension(R.dimen.app_list_unread_margin_right);  
47.             }  
48.   
49.             int unreadBgPosX = icon.getScrollX() + icon.getWidth() - unreadBgWidth - unreadMarginRight;  
50.             int unreadBgPosY = icon.getScrollY() + unreadMarginTop;  
51.   
52.             canvas.save();  
53.             canvas.translate(unreadBgPosX, unreadBgPosY);  
54.   
55.             unreadBgNinePatchDrawable.draw(canvas);  
56.   
57.             /// M: Draw unread text.  
58.             Paint.FontMetrics fontMetrics = unreadTextNumberPaint.getFontMetrics();  
59.             if (info.unreadNum > Launcher.MAX_UNREAD_COUNT) {  
60.                 canvas.drawText(unreadTextNumber,  
61.                                 (unreadBgWidth - unreadTextPlusBounds.width()) / 2,  
62.                                 (unreadBgHeight + textHeight) / 2,  
63.                                 unreadTextNumberPaint);  
64.                 canvas.drawText(unreadTextPlus,  
65.                                 (unreadBgWidth + unreadTextNumberBounds.width()) / 2,  
66.                                 (unreadBgHeight + textHeight) / 2 + fontMetrics.ascent / 2,  
67.                                 unreadTextPlusPaint);  
68.             } else {  
69.                .....  
70.         }  
71.     }  

 unread_support_shortcuts.xml(配置哪些应用可以显示待处理的事件)

packages/apps/Launcher2/res/xml/unread_support_shortcuts.xml

Xml代码  

1. <unreadshortcuts xmlns:launcher="http://schemas./apk/res/com.android.launcher">  
2. <!--电话-->  
3.     <shortcut  
4.         launcher:unreadPackageName="com.android.contacts"  
5.         launcher:unreadClassName="com.android.contacts.activities.DialtactsActivity"  
6.         launcher:unreadType="0"  
7.         launcher:unreadKey="com_android_contacts_mtk_unread"  
8.      />  
9. <!--短信-->  
10.      <shortcut  
11.         launcher:unreadPackageName="com.android.mms"  
12.         launcher:unreadClassName="com.android.mms.ui.BootActivity"  
13.         launcher:unreadType="0"  
14.         launcher:unreadKey="com_android_mms_mtk_unread"  
15.      />  
16. <!--邮件-->  
17.      <shortcut  
18.         launcher:unreadPackageName="com.android.email"  
19.         launcher:unreadClassName="com.android.email.activity.Welcome"  
20.         launcher:unreadType="0"  
21.         launcher:unreadKey="com_android_email_mtk_unread"  
22.      />  
23.     ................  
24. </unreadshortcuts>