android動態修改app案頭icon

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原理：
在Manifest檔案中，使用<activity-alias>標籤為我們的入口Activity準備多個，擁有<activity-alias>標籤的activity是為了指向入口Activity，每個擁有<activity-alias>標籤的activity都可以單獨設定一個icon，在程式中我們動態設定<activity-alias>，然後kill掉launcher，等launcher重啟後，icon就替換了注意：
kill掉launcher需加許可權 <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>代碼：
Manifest.xml: [html] view plaincopy 

1. <activity  
2.             android:name="com.dance.changeicondemo.MainActivity"  
3.             android:label="@string/app_name" >  
4.             <intent-filter>  
5.                 <action android:name="android.intent.action.MAIN" />  
6.             </intent-filter>  
7.         </activity>  
8.         <activity-alias  
9.             android:name="com.example.changeicondemo.ActivityAlias1"  
10.             android:enabled="true"  
11.             android:icon="@drawable/ic_launcher"  
12.             android:label="@string/app_name"  
13.             android:targetActivity="com.dance.changeicondemo.MainActivity" >  
14.             <intent-filter>  
15.                 <action android:name="android.intent.action.MAIN" />  
16.                 <category android:name="android.intent.category.LAUNCHER" />  
17.             </intent-filter>  
18.         </activity-alias>  
19.         <activity-alias  
20.             android:name="com.example.changeicondemo.ActivityAlias2"  
21.             android:enabled="false"  
22.             android:icon="@drawable/icon2"  
23.             android:label="@string/app_name"  
24.             android:targetActivity="com.dance.changeicondemo.MainActivity" >  
25.             <intent-filter>  
26.                 <action android:name="android.intent.action.MAIN" />  
27.                 <category android:name="android.intent.category.LAUNCHER" />  
28.             </intent-filter>  
29.         </activity-alias>  

code: [java] view plaincopy 

1. private void setIcon(String activity_alias) {  
2.         Context ctx = MyApplication.getContext();  
3.         PackageManager pm = ctx.getPackageManager();  
4.         ActivityManager am = (ActivityManager) ctx.getSystemService(Activity.ACTIVITY_SERVICE);  
5.    
6.         // Enable/disable activity-aliases  
7.         pm.setComponentEnabledSetting(  
8.                 new ComponentName(ctx, ACTIVITY_ALIAS_1),  
9.                 ACTIVITY_ALIAS_1.equals(activity_alias) ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED  
10.                         : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,  
11.                 PackageManager.DONT_KILL_APP);  
12.         pm.setComponentEnabledSetting(  
13.                 new ComponentName(ctx, ACTIVITY_ALIAS_2),  
14.                 ACTIVITY_ALIAS_2.equals(activity_alias) ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED  
15.                         : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,  
16.                 PackageManager.DONT_KILL_APP);  
17.    
18.         // Find launcher and kill it  
19.         Intent i = new Intent(Intent.ACTION_MAIN);  
20.         i.addCategory(Intent.CATEGORY_HOME);  
21.         i.addCategory(Intent.CATEGORY_DEFAULT);  
22.         List<ResolveInfo> resolves = pm.queryIntentActivities(i, 0);  
23.         for (ResolveInfo res : resolves) {  
24.             if (res.activityInfo != null) {  
25.                 am.killBackgroundProcesses(res.activityInfo.packageName);  
26.             }  
27.         }  
28.     }  

android動態修改app案頭icon