Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class have you declared this activity in your AndroidManifest.xml?
解決方法是手動修改 AndroidManiftest.xml 內的 android:name 輸入完整的 package namespace 含 class
以動態桌布為例
<service
android:name="your.package.namespace.TestLiveWallpaper"
</service>
<activity
android:name="your.package.namespace.TestLiveWallpaper"
</activity>
動態桌布的 xml 內的 android:settingActivity 也需要改成這樣
<wallpaper xmlns:android="http://schemas.android.com/apk/res/android" android:settingsActivity="your.package.namespace.TestLiveWallpaper"
/>