android动态修改app桌面icon

原理：
在Manifest文件中，使用<activity-alias>标签为我们的入口Activity准备多个，拥有<activity-alias>标签的activity是为了指向入口Activity，每个拥有<activity-alias>标签的activity都可以单独设置一个icon，在程序中我们动态设置<activity-alias>，然后kill掉launcher，等launcher重启后，icon就替换了

注意：
kill掉launcher需加权限 <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>

代码：
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. // Enable/disable activity-aliases
6. pm.setComponentEnabledSetting(
7. new ComponentName(ctx, ACTIVITY_ALIAS_1),
8. ACTIVITY_ALIAS_1.equals(activity_alias) ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
9. : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
10. PackageManager.DONT_KILL_APP);
11. pm.setComponentEnabledSetting(
12. new ComponentName(ctx, ACTIVITY_ALIAS_2),
13. ACTIVITY_ALIAS_2.equals(activity_alias) ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
14. : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
15. PackageManager.DONT_KILL_APP);
16. // Find launcher and kill it
17. Intent i = new Intent(Intent.ACTION_MAIN);
18. i.addCategory(Intent.CATEGORY_HOME);
19. i.addCategory(Intent.CATEGORY_DEFAULT);
20. List<ResolveInfo> resolves = pm.queryIntentActivities(i, 0);
21. for (ResolveInfo res : resolves) {
22. if (res.activityInfo != null) {
23. am.killBackgroundProcesses(res.activityInfo.packageName);
24. }
25. }
26. }