我创建了一个有三个项目的微调器
日常
每周
每月一次
navSpinner = new ArrayList<SpinnerNavItem>();
navSpinner.add(new SpinnerNavItem(getResources().getString(R.string.dailyview)));
navSpinner.add(new SpinnerNavItem(getResources().getString(R.string.weekview)));
navSpinner.add(new SpinnerNavItem(getResources().getString(R.string.monthview)));
adapter = new TitleNavigationAdapter(getActivity().getApplicationContext(),navSpinner);
mSpinner = (Spinner) rootView.findViewById(R.id.spinner);
mSpinner.setAdapter(adapter);
mSpinner.setOnItemSelectedListener(this);
OnItemSelected方法(实现AdapterView.OnItemSelectedListener)
public void onItemSelected(AdapterView<?> parentView,View v,int position,long id) {
Log.e("Position","= " + position);
if (mNaviFirstHit)
{
mNaviFirstHit = false;
}
else
{
Fragment fragment = null;
switch (position) {
case 0:
Log.e("Week","= " + position);
break;
case 1:
backspace = 1;
Log.e("Week","= " + position);
break;
case 2:
backspace = 1;
Log.e("Week","= " + position);
break;
default:
break;
}
}
}
public void onNothingSelected(AdapterView<?> parentView) {
}
适配器：
public class TitleNavigationAdapter extends BaseAdapter
{
private TextView txtTitle;
private ArrayList<SpinnerNavItem> spinnerNavItem;
private Context context;
private TextView txtHeading;
private SharedPreferences pref;
public TitleNavigationAdapter(Context context,ArrayList<SpinnerNavItem> spinnerNavItem)
{
this.spinnerNavItem = spinnerNavItem;
this.context = context;
}
@Override
public int getCount()
{
return spinnerNavItem.size();
}
@Override
public Object getItem(int index)
{
return spinnerNavItem.get(index);
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public View getView(int position,View convertView,ViewGroup parent)
{
if (convertView == null)
{
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.list_item_title,null);
}
txtTitle = (TextView) convertView.findViewById(R.id.txtTitle);
txtTitle.setText(spinnerNavItem.get(position).getTitle());
txtTitle.setTextColor(context.getResources().getColor(R.color.orangeText));
txtTitle.setTextSize(TypedValue.COMPLEX_UNIT_SP,12);
pref = context.getSharedPreferences("MyPref",Context.MODE_PRIVATE);
String text = pref.getString("selectedItem",context.getResources().getString(R.string.transaction_main_gridview));
if (text.equalsIgnoreCase(convertView.getResources().getString(R.string.transaction_main_gridview)))
{
txtTitle.setText(convertView.getResources().getString(R.string.transaction_main_gridview_text));
}
else if (text.equalsIgnoreCase(convertView.getResources().getString(R.string.transaction_main_weekview)))
{
txtTitle.setText(convertView.getResources().getString(R.string.transaction_main_weekly_text));
}
else if (text.equalsIgnoreCase(convertView.getResources().getString(R.string.transaction_main_monthview)))
{
txtTitle.setText(convertView.getResources().getString(R.string.transaction_main_monthly_text));
}
return convertView;
}
@Override
public View getDropDownView(int position,ViewGroup parent)
{
if (convertView == null)
{
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.list_item_title,null);
}
txtTitle = (TextView) convertView.findViewById(R.id.txtTitle);
txtTitle.setPadding(20,20,20);
txtHeading = (TextView) convertView.findViewById(R.id.txtheading);
txtHeading.setVisibility(View.GONE);
txtTitle.setText(spinnerNavItem.get(position).getTitle());
return convertView;
}
}
当我选择位置1或2(我正确地记录日志)然后从位置1或2,如果我选择位置0日志没有打印,上述代码工作正常.位置不被调用.即使位置记录没有被打印.
这真的很奇怪,我不知道为什么会发生这种情况？有人可以帮我吗？
谢谢！
解决方法
如果要在片段中创建一个Spinner,您必须在Fragment onCreatedView()中声明它.不在你的FragmentActivity onCreate().
OnItemSelectedListener如果要在Fragment中的旋转器上使用侦听器,则必须在FragmentMain内部实现,而不是在Activity中.
您的代码的这些更改已经过测试.
你的上下文返回null(在我的测试代码中)：
Context mContext = getActivity().getApplicationContext();// returns null !
所以改为：
TitleNavigationAdapter adapter = new TitleNavigationAdapter(this,navSpinner); //添加此项
你的活动是否包含OnItemSelectedListener？：
public class InformationList extends Activity implements OnItemSelectedListener {
.....
我也会在TitleNavigationAdapter中改变这一点：
@Override
public SpinnerNavItem getItem(int index) //SpinnerNavItem from Object
{
return spinnerNavItem.get(index);
}
结果：
07-18 19:46:53.468: E/Position(27325): = 0 07-18 19:46:53.468: E/day(27325): = 0 07-18 19:47:04.487: E/Position(27325): = 1 07-18 19:47:04.488: E/Week(27325): = 1 07-18 19:47:06.426: E/Position(27325): = 2 07-18 19:47:06.426: E/month(27325): = 2
正常运行
