• 1、配置activity别名

android:enabled 属性，布尔类型，是否开启别名设置，默认值为 true；
android:exported 属性，布尔类型，是否支持其他应用通过这个别名访问目标 Activity，默认值为 true；

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity-alias
            android:name=".icon_tag"
            android:enabled="true"
            android:icon="@drawable/ic_launcher"
            android:targetActivity=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity-alias>
        <activity-alias
            android:name=".icon_tag_2"
            android:enabled="false"
            android:icon="@drawable/ic_launcher1"
            android:targetActivity=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity-alias>

• 2、执行切换逻辑

icon tag为您配置的别名路径，比如com.demo.icon_tag

 pm.setComponentEnabledSetting(getComponentName(),
                        PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
 pm.setComponentEnabledSetting(new ComponentName(this,icon_tag),
                        PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);

点击后即可更换如果需要及时更换需要重启luncher activity：
private void restartApp(){
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.addCategory(Intent.CATEGORY_DEFAULT);
List<ResolveInfo> resolves = pm.queryIntentActivities(intent, 0);
for (ResolveInfo res : resolves) {
if (res.activityInfo != null) {
ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
am.killBackgroundProcesses(res.activityInfo.packageName);
}
}

参考资料：http://www.jianshu.com/p/2caea5909a87