Android 片段中微调器的 setOnItemSelectedListener
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/23449270/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
setOnItemSelectedListener for spinner in Fragment
提问by Mounir Elfassi
I have this error in setOnItemSelectedListener:
我有这个错误setOnItemSelectedListener：
The method setOnItemSelectedListener(AdapterView.OnItemSelectedListener) in the type AdapterView is not applicable for the arguments (FragmentMain)"
AdapterView 类型中的 setOnItemSelectedListener(AdapterView.OnItemSelectedListener) 方法不适用于参数 (FragmentMain)"
Fragment Class :
片段类：
public class FragmentMain extends Fragment {
private Spinner countriesSpinner;
private Activity rootView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
View rootView =inflater.inflate(R.layout.activity_main, container, false);
return rootView;
}
@Override
public void onStart() {
super.onStart();
addItemsOnSpinner();
}
public void addItemsOnSpinner() {
countriesSpinner = (Spinner) rootView.findViewById(R.id.team_list_spinner);
countriesSpinner.setOnItemSelectedListener(new CustomOnItemSelectedListener ()) ;
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(),
R.array.team_list, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
countriesSpinner.setAdapter(adapter);
countriesSpinner.setOnItemSelectedListener(this);
}
public class CustomOnItemSelectedListener extends Activity implements
OnItemSelectedListener {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos,
long id) {
// TODO Auto-generated method stub
if (parent.getItemAtPosition(pos).toString()
.equals("San Antonio Spurs")) {
Intent i = new Intent(getApplicationContext(), Spurs_games.class);
startActivity(i);
finish();}
if (parent.getItemAtPosition(pos).toString()
.equals("Los Angeles Lakers")) {
Intent i = new Intent(getApplicationContext(), Lakers_games.class);
startActivity(i);
finish();}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
public void onItemSelected(AdapterView<?> parent, View view, int pos,
long id) {
if (parent.getItemAtPosition(pos).toString()
.equals("San Antonio Spurs")) {
Intent i = new Intent(getActivity(), Spurs_games.class);
startActivity(i);
finish();}
if (parent.getItemAtPosition(pos).toString()
.equals("Los Angeles Lakers")) {
Intent i = new Intent(getActivity(), Lakers_games.class);
startActivity(i);
finish();}
}
private void finish() {
// TODO Auto-generated method stub
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
This is my 1st post here, so excuse/correct me PLEASE. Sorry for my English..
这是我在这里的第一篇文章，所以请原谅/纠正我。对不起我的英语不好..
回答by Silverstorm
setOnItemSelectedListener
Must be implemented inside your FragmentMainnot inside your Activityif you want to use the listener on the spinner inside the Fragment
如果您想在 Fragment 内的微调器上使用侦听器，则必须在您的FragmentMain内部实现而不是在您Activity的内部实现
inside your FragmentMain onCreateView
在您的 FragmentMain onCreateView 中
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
...
}
put this code
把这个代码
countriesSpinner = (Spinner) rootView.findViewById(R.id.team_list_spinner);
countriesSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
回答by donfuxx
The problem is this line here:
问题是这里的这一行：
countriesSpinner.setOnItemSelectedListener(this);
because "this" refers to the Fragment in your case, but you should pass in an OnItemSelectedListener object.
因为“this”在您的情况下是指 Fragment，但您应该传入 OnItemSelectedListener 对象。
Also there seems to be quite a confusion about how Listeners work. You probably wanted to implement OnItemSelectedListener in your Fragment instead of creating that CustomOnItemSelectedListenerActivity. Or alternatively create an anonymous OnItemSelectedListener:
此外，关于 Listeners 的工作方式似乎也很混乱。您可能希望在 Fragment 中实现 OnItemSelectedListener 而不是创建该CustomOnItemSelectedListenerActivity。或者创建一个匿名 OnItemSelectedListener：
countriesSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
