運行后，界面無內容。報錯如下
[2016-01-03 12:24:49 - baseadapter] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.baseadapter/.MainActivity }
[2016-01-03 12:24:49 - baseadapter] ActivityManager: Warning: Activity not started, its current task has been brought to the front
2016-01-03