我有3个视图设置为在另一个下方显示。但问题是这个视图（中间的）在屏幕上根本没有显示出来。 我不确定如何将此列表发送到父视图。
以下是代码：
public class MyActivity extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View view = inflater.inflate(R.layout.my_activity_layout, container, false);
DataListFragment list = new DataListFragment();
return view;
}
public static class DataListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<List<Model>> {
CustomListViewAdapter mAdapter;
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setEmptyText("No Data Here");
mAdapter = new CustomListViewAdapter(getActivity());
setListAdapter(mAdapter);
setListShown(false);
// Prepare the loader.
getLoaderManager().initLoader(0, null, this);
}
@Override
public Loader<List<Model>> onCreateLoader(int arg0, Bundle arg1) {
System.out.println("DataListFragment.onCreateLoader");
return new DataListLoader(getActivity());
}
@Override
public void onLoadFinished(Loader<List<Model>> arg0, List<Model> data) {
mAdapter.setData(data);
System.out.println("DataListFragment.onLoadFinished");
// The list should now be shown.
if (isResumed()) {
setListShown(true);
} else {
setListShownNoAnimation(true);
}
}
@Override
public void onLoaderReset(Loader<List<Model>> arg0) {
mAdapter.setData(null);
}
}
public static class DataListLoader extends AsyncTaskLoader<List<Model>> {
List<Model> mModels;
public DataListLoader(Context context) {
super(context);
}
@Override
public List<Model> loadInBackground() {
System.out.println("DataListLoader.loadInBackground");
List<Model> entries = new ArrayList<Model>(5);
entries.add(new Model("1", "2","3"));
entries.add(new Model("1", "2","3"));
entries.add(new Model("1", "2","3"));
return entries;
}
/**
* Called when there is new data to deliver to the client.
*/
@Override public void deliverResult(List<Model> listOfData) {
if (isReset()) {
// An async query came in while the loader is stopped. We
// don't need the result.
if (listOfData != null) {
onReleaseResources(listOfData);
}
}
List<Model> oldApps = listOfData;
mModels = listOfData;
if (isStarted()) {
// If the Loader is currently started, we can immediately
// deliver its results.
super.deliverResult(listOfData);
}
// At this point we can release the resources associated with
// 'oldApps' if needed; now that the new result is delivered we
// know that it is no longer in use.
if (oldApps != null) {
onReleaseResources(oldApps);
}
}
/**
* Handles a request to start the Loader.
*/
@Override protected void onStartLoading() {
if (mModels != null) {
// If we currently have a result available, deliver it
// immediately.
deliverResult(mModels);
}
if (takeContentChanged() || mModels == null) {
// If the data has changed since the last time it was loaded
// or is not currently available, start a load.
forceLoad();
}
}
/**
* Handles a request to stop the Loader.
*/
@Override protected void onStopLoading() {
// Attempt to cancel the current load task if possible.
cancelLoad();
}
/**
* Handles a request to cancel a load.
*/
@Override public void onCanceled(List<Model> apps) {
super.onCanceled(apps);
// At this point we can release the resources associated with 'apps'
// if needed.
onReleaseResources(apps);
}
/**
* Handles a request to completely reset the Loader.
*/
@Override protected void onReset() {
super.onReset();
// Ensure the loader is stopped
onStopLoading();
// At this point we can release the resources associated with 'apps'
// if needed.
if (mModels != null) {
onReleaseResources(mModels);
mModels = null;
}
}
/**
* Helper function to take care of releasing resources associated
* with an actively loaded data set.
*/
protected void onReleaseResources(List<Model> apps) {}
}
}
这是自定义适配器：
public class CustomListViewAdapter extends ArrayAdapter<Model>{
private final LayoutInflater mInflater;
public CustomListViewAdapter(Context context) {
super(context, android.R.layout.simple_list_item_2);
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public void setData(List<Model> data) {
clear();
if (data != null) {
for (Model appEntry : data) {
add(appEntry);
}
}
}
/**
* Populate new items in the list.
*/
@Override public View getView(int position, View convertView, ViewGroup parent) {
View view;
if (convertView == null) {
view = mInflater.inflate(R.layout.single_item, parent, false);
} else {
view = convertView;
}
Model item = getItem(position);
((TextView)view.findViewById(R.id.tV_1)).setText(item.getA());
((TextView)view.findViewById(R.id.tV_2)).setText(item.getB());
((TextView)view.findViewById(R.id.tV_3)).setText(item.getC());
return view;
}
}
这是我的主要活动：
public class MainActivity extends Activity{
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.song_info_fragment, new TopActivity());
fragmentTransaction.add(R.id.playlist_activity_fragment, new MyActivity());
fragmentTransaction.add(R.id.controls_fragment, new BottomActivity());
fragmentTransaction.commit();
}
}
当我运行代码时，我只看到顶部和底部的活动。我该如何解决这个问题？
答案 0 :(得分：0)
好的，我终于能够让这个工作了。 我将DataListFragment类复制到同名的新类文件中，并删除了静态keywork。 此外，我将另一个名为dataListLoader的部分复制到另一个名为DataListLoader.java的文件中。 并将fragment.add（）事务移动到mainActivity文件中。就这样做了！