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问题描述
我有一个带有2个微调器的片段类,一个微调器有3个值,即零售商,管理员和订阅者,当点击零售商选项时,第二个微调器必须是可见的,当点击其他2个选项时,第二个微调器必须是不可见的。
我使用的代码如下
这是片段的onResume方法中的第一个微调器。
logAs =(Spinner)getActivity()。findViewById(R.id.spinner5);
列表list = new ArrayList();
list.add( Subscriber);
list.add( 零售商);
list.add( 管理员);
ArrayAdapter dataAdapter = new ArrayAdapter(getActivity(),android.R.layout.simple_spinner_item,list);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
logAs.setAdapter(dataAdapter);
logAs.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener(){
@ Override
public void onItemSelected(AdapterView<?> parent,View view, int position, long id){
switch (位置){
case 0 :
// chooseRetailerDetails();
// choodeRetailer.setVisibility(View.INVISIBLE);
break ;
case 1 :
chooseRetailerDetails();
// choodeRetailer.setVisibility(View.VISIBLE);
break ;
case 3 :
/ / choodeRetailer.setEnabled(false);
break ;
}
}
});
现在在case语句中我尝试设置第二个微调器的可见性我得到一个空指针异常。
解决方案
I have a fragment class with 2 spinners, one spinner has 3 values namely retailer, admin and subscriber, when the retailer option is clicked the 2nd spinner must be visible and when the other 2 options are clicked the 2nd spinner must be invisible.
the code i used is as follows
this is the first spinner in onResume method of the fragment.
logAs = (Spinner) getActivity().findViewById(R.id.spinner5); List list = new ArrayList(); list.add("Subscriber"); list.add("Retailer"); list.add("Administrator"); ArrayAdapter dataAdapter = new ArrayAdapter(getActivity(), android.R.layout.simple_spinner_item, list); dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); logAs.setAdapter(dataAdapter); logAs.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { switch (position){ case 0: //chooseRetailerDetails(); // choodeRetailer.setVisibility(View.INVISIBLE); break; case 1: chooseRetailerDetails(); //choodeRetailer.setVisibility(View.VISIBLE); break; case 3: //choodeRetailer.setEnabled(false); break; } } });
now in the case statement when i try to set the visibility of the second spinner i get a null pointer exception.
解决方案
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