各類錯誤集錦

1.因爲adapter的getview方法返回爲空致使的報錯信息

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setDrawingCacheBackgroundColor(int)' on a null object reference
at android.widget.AbsListView.obtainView(AbsListView.java:2360)
at android.widget.ListView.makeAndAddView(ListView.java:1864)
at android.widget.ListView.fillDown(ListView.java:698)
at android.widget.ListView.fillFromTop(ListView.java:759)
at android.widget.ListView.layoutChildren(ListView.java:1659)
at android.widget.AbsListView.onLayout(AbsListView.java:2151)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)

 

2. 因爲Manifest文件中多了個<Meta-data>標籤，可是其中又沒有name和value屬性，致使R文件找不到