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android 解决.XML提示ava.lang.NullPointerException at错误后XML没显示

提示错误:

 1 java.lang.NullPointerException 2 Exception details are logged in Window > Show View > Error Log 3  4 java.lang.NullPointerException 5     at com.xxxx.ui.xxxxview.IphoneTreeView.onLayout(IphoneTreeView.java:236) 6     at android.view.View.layout(View.java:14817) 7     at android.view.ViewGroup.layout(ViewGroup.java:4631) 8     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 9     at android.widget.FrameLayout.onLayout(FrameLayout.java:388)10     at android.view.View.layout(View.java:14817)11     at android.view.ViewGroup.layout(ViewGroup.java:4631)12 ....

意思是提示 指针或对象空,具体列表;

解决方法:点击“IphoneTreeView.java:236”会跳到错误的.JAVA代码中,

对对象或指针进行判断不为NULL再使用。如:

1         int state =0; 2         if (mAdapter != null)//加上判断就可以解决,之前是没有判断引起的3           state = mAdapter.getTreeHeaderState(groupPos, childPos);

 

android 解决.XML提示ava.lang.NullPointerException at错误后XML没显示