FATAL EXCEPTION: Timer-0

错误：

FATAL EXCEPTION: Timer-0

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.gxiec_800/com.example.gxiec_800.FirstLayout_activity}; have you declared this activity in your AndroidManifest.xml?  在ndroidManifest.xml中找不到FirstLayout_activity

原因：

在ndroidManifest.xml中注册时，android:name=".FirstLayout_activity" 前多写了android:name="activity.FirstLayout_activity" 

解决方法：

修改<activity android:name=".FirstLayout_activity" >activity>