在我的Android应用中，我正在尝试构建我的第一个自定义listadapter。我现在设法使它显示一项，但不幸的是，仅当列表中有8条时才显示一项。我的适配器如下所示：
public class PossibilitiesAdapter extends BaseAdapter {
private AdapterCallbacks callbacks;
private List<String> possibilitiesList = new ArrayList<String>();
private LayoutInflater inflater;
public PossibilitiesAdapter(Context context) {
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public void setPossibilitiesList(List<String> possibilitiesList) {
for (String possibility : possibilitiesList) {
addItem(possibility);
}
}
public void addItem (final String item) {
possibilitiesList.add(item);
notifyDataSetChanged();
}
private class ViewHolder {
TextView possibilityTitle;
}
@Override
public View getView(final int position, View convertView, ViewGroup viewGroup) {
ViewHolder holder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_item_posibility, viewGroup, false);
holder.possibilityTitle = (TextView) convertView.findViewById(R.id.text_possibility);
holder.possibilityTitle.setText(possibilitiesList.get(position));
return convertView;
}
@Override
public int getCount() {
return possibilitiesList.size();
}
// And here are some more things like getItemId() and getItem()
}
我从片段中设置了可能性列表，如下所示：
List<String> list = Arrays.asList(getResources().getStringArray(R.array.the_possibilities));
Log.e(this, new Integer(list.size()).toString()); // Outputs 8, so there are enough in the array.
adapter.setPossibilitiesList(list);
我的fragment_possibilities.xml看起来像这样：
<ListView
android:id="@+id/list_possibilities"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
和我的list_item_possibility.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text_possibility"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
因此，问题在于它仅显示第一项，仅此而已。有谁知道问题是什么以及如何解决？
您是否将列表嵌套在ScrollView中？通常只会显示一项。尝试避免这种情况o使用以下方法。
/**
* read all adapter views and calculate total length
*
* @param listView
*/
public static void setListViewHeightBasedOnChildren(ListView listView) {
ListAdapter listAdapter = listView.getAdapter();
if (listAdapter == null) {
return;
}
int totalHeight = 0;
int desiredWidth = MeasureSpec.makeMeasureSpec(listView.getWidth(), MeasureSpec.AT_MOST);
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, listView);
listItem.measure(desiredWidth, MeasureSpec.UNSPECIFIED);
totalHeight += listItem.getMeasuredHeight();
}
setListViewHeight(listView, totalHeight);
}
/**
* set listview height
*
* @param listView
* @param height
*/
public static void setListViewHeight(ListView listView, int height) {
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = height + (listView.getDividerHeight() * (listView.getAdapter().getCount() - 1));
listView.setLayoutParams(params);
listView.requestLayout();
}
不，那是行不通的，正如我所说，您不能将ListView放在ScrollView中。
尝试这个：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="@+id/list_possibilities"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
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我来说两句