我有一个FragmentActivity,其中包含一个EditText和一个ListFragment。 在ListFragment中,我有一个适配器来填充所有的项。
public class XXXListFragment extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
...
ArrayAdapter<Spanned> adapter = new ArrayAdapter<Spanned>(inflater.getContext(),
R.layout.fragment_list_item_appearance, spannedArray);
setListAdapter(adapter);
return super.onCreateView(inflater, container, savedInstanceState);
}
}
使用EditText,我想让用户来过滤列表项。
public class XXX extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.quests_activity);
EditText ediText = (EditText) findViewById(R.id.editext);
ediText .addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
ListFragment.this.adapter.getFilter().filter(cs);
}
...
});
}
我的问题是我无法通过以下方式获取Listfragment的上下文:
ListFragment.this.adapter.getFilter().filter(cs);
抛出以下错误:
无法在范围内访问类型QuestsListFragment的任何封闭实例
有什么想法解决这个问题吗?
好的,这是整段代码。 我刚开始使用Fragments...
FragmentActivity:
public class XXX extends FragmentActivity implements ListFragmentItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.xxx_activity);
}
@Override
protected void onStart() {
super.onStart();
EditText editText = (EditText) findViewById(R.id.edittext)
editText .addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// THIS DOESN'T WORK
XXXListFragment.this.adapter.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
}
@Override
public void afterTextChanged(Editable arg0) {
}
});
}
@Override
public void onListFragmentItemClick(int position) {
int orientation = getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment prevFrag = fragmentManager.findFragmentByTag("xxx.details");
if (prevFrag != null)
fragmentTransaction.remove(prevFrag);
XXXDetailsFragment fragment = new XXXDetailsFragment();
Bundle b = new Bundle();
b.putInt("position", position);
fragment.setArguments(b);
fragmentTransaction.add(R.id.xxx_detail_fragment_container, fragment,
"xxx.details");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
} else {
...
}
}
...
}
ListFragment:
public class XXXListFragment extends ListFragment {
ListFragmentItemClickListener ifaceItemClickListener;
public interface ListFragmentItemClickListener {
void onListFragmentItemClick(int position);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
ifaceItemClickListener = (ListFragmentItemClickListener) activity;
} catch (Exception e) {
Toast.makeText(activity.getBaseContext(), "Exception", Toast.LENGTH_SHORT).show();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Spanned[] xxx = { Html.fromHtml(getString(R.string.xxx)), ... };
ArrayAdapter<Spanned> adapter = new ArrayAdapter<Spanned>(inflater.getContext(),
R.layout.fragment_list_item_appearance, xxx);
setListAdapter(adapter);
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
ifaceItemClickListener.onListFragmentItemClick(position);
}
}
被添加到FragmentActivity布局中:<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
...
<EditText
android:id="@+id/edittext"
style="@style/red_edittext"
android:hint="@string/exittext_input_search" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<fragment
android:id="@+id/xxx_list_fragment"
android:name="com.xxx.XXXListFragment"
android:layout_width="350dp"
android:layout_height="wrap_content" />
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<FrameLayout
android:id="@+id/xxx_detail_fragment_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
</FrameLayout>
</ScrollView>
</LinearLayout>
</LinearLayout>
ListFragment
的代码在哪里?你只需要保留对ListFragment
的引用,并在其中拥有一个公共方法,这样你就可以直接调用它。 - Squonk