Unity3D ：Mob SMSSDK 运行崩溃

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.shuiying.smsm09061/com.mob.tools.MobUIShell}; have you declared this activity in your AndroidManifest.xml?      

<activity
            android:name="com.mob.tools.MobUIShell"
            android:configChanges="keyboardHidden|orientation|screenSize|locale|layoutDirection"
            android:theme="@android:style/Theme.NoTitleBar"
            android:windowSoftInputMode="stateHidden|adjustResize" />