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我正在嘗試製作具有分隔符的ActionBar微調器。我實施了一個SpinnerAdapter，它有兩個項目視圖類型（感謝getViewTypeCount）。問題是我正在從其他類型發送一些convertViews。Android爲什麼在我的SpinnerAdapter中回收錯誤的視圖類型？
這裏是我的SpinnerAdapter：
public abstract class SeparatorSpinnerAdapter implements SpinnerAdapter {
Context mContext;
List<Object> mData;
int mSeparatorLayoutResId, mActionBarItemLayoutResId, mDropDownItemLayoutResId, mTextViewResId;
public static class SpinnerSeparator {
public int separatorTextResId;
public SpinnerSeparator(final int resId) {
separatorTextResId = resId;
}
}
public abstract String getText(int position);
public SeparatorSpinnerAdapter(final Context ctx, final List<Object> data, final int separatorLayoutResId, final int actionBarItemLayoutResId,
final int dropDownItemLayoutResId, final int textViewResId) {
mContext = ctx;
mData = data;
mSeparatorLayoutResId = separatorLayoutResId;
mActionBarItemLayoutResId = actionBarItemLayoutResId;
mDropDownItemLayoutResId = dropDownItemLayoutResId;
mTextViewResId = textViewResId;
}
protected String getString(final int resId) {
return mContext.getString(resId);
}
@Override
public void registerDataSetObserver(final DataSetObserver observer) {
}
@Override
public void unregisterDataSetObserver(final DataSetObserver observer) {
}
@Override
public int getCount() {
if (mData != null) {
return mData.size();
}
return 0;
}
@Override
public Object getItem(final int position) {
return mData == null ? null : mData.get(position);
}
@Override
public boolean isEmpty() {
return getCount() == 0;
}
@Override
public long getItemId(final int position) {
return 0;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
return getView(mActionBarItemLayoutResId, position, convertView, parent);
}
public boolean isSeparator(final int position) {
final Object item = getItem(position);
if (item != null) {
return item instanceof SpinnerSeparator;
}
return false;
}
@Override
public int getItemViewType(final int position) {
return isSeparator(position) ? 0 : 1;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public View getDropDownView(final int position, final View convertView, final ViewGroup parent) {
return getView(isSeparator(position) ? mSeparatorLayoutResId : mDropDownItemLayoutResId, position, convertView, parent);
}
private View getView(final int layoutResId, final int position, final View convertView, final ViewGroup parent) {
View v;
Log.i("TAG", "getView #" + position + "\tVT=" + getItemViewType(position) + "\tCV="
+ (convertView == null ? " null " : convertView.getClass().getSimpleName()) + "\ttext=> " + getText(position));
if (convertView == null) {
final LayoutInflater li = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = li.inflate(layoutResId, parent, false);
} else {
v = convertView;
}
final TextView tv = (TextView) v.findViewById(mTextViewResId);
if (tv != null) {
tv.setText(getText(position));
if (isSeparator(position)) {
tv.setOnClickListener(null);
tv.setOnTouchListener(null);
}
}
return v;
}
}
一個實現：
public class IssuesMainFilterAdapter extends SeparatorSpinnerAdapter {
public IssuesMainFilterAdapter(final Context ctx, final List<Query> queries, final List<Project> projects) {
super(ctx, buildDataArray(queries, projects), R.layout.issues_filter_spinner_separator, R.layout.issues_filter_spinner_in_actionbar,
R.layout.issues_filter_spinner, R.id.issues_filter_spinner_text);
}
private static List<Object> buildDataArray(final List<Query> queries, final List<Project> projects) {
final List<Object> data = new ArrayList<Object>();
data.add(null); // "ALL"
data.add(new SpinnerSeparator(R.string.issue_filter_queries));
data.addAll(queries);
data.add(new SpinnerSeparator(R.string.issue_filter_projects));
data.addAll(projects);
return data;
}
@Override
public String getText(final int position) {
final Object item = getItem(position);
if (item == null) {
return getString(R.string.issue_filter_all);
} else if (item instanceof Query) {
return ((Query) item).name;
} else if (item instanceof Project) {
return ((Project) item).name;
} else if (item instanceof SpinnerSeparator) {
return getString(((SpinnerSeparator) item).separatorTextResId);
}
throw new InvalidParameterException("Item has unknown type: " + item);
}
}
正如你可能已經注意到，我已經設置了日誌行到getView()讓我更好地瞭解這是怎麼回事：
05-06 14:01:28.721 I/TAG(5879): getView #0 VT=1 CV=TextView text=> ####
05-06 14:01:28.721 I/TAG(5879): getView #1 VT=0 CV=LinearLayout text=> ####
05-06 14:01:28.729 I/TAG(5879): getView #2 VT=1 CV=TextView text=> ####
05-06 14:01:28.745 I/TAG(5879): getView #3 VT=1 CV=TextView text=> ####
05-06 14:01:28.745 I/TAG(5879): getView #4 VT=0 CV=LinearLayout text=> ####
05-06 14:01:28.745 I/TAG(5879): getView #5 VT=1 CV=TextView text=> ####
05-06 14:01:28.753 I/TAG(5879): getView #6 VT=1 CV=TextView text=> ####
05-06 14:01:28.768 I/TAG(5879): getView #7 VT=1 CV=TextView text=> ####
05-06 14:01:28.768 I/TAG(5879): getView #8 VT=1 CV=TextView text=> ####
05-06 14:01:28.768 I/TAG(5879): getView #9 VT=1 CV=TextView text=> ####
05-06 14:01:28.776 I/TAG(5879): getView #10 VT=1 CV=TextView text=> ####
05-06 14:01:28.792 I/TAG(5879): getView #11 VT=1 CV=TextView text=> ####
05-06 14:01:32.081 I/TAG(5879): getView #12 VT=1 CV=TextView text=> ####
05-06 14:01:34.690 I/TAG(5879): getView #13 VT=1 CV=LinearLayout text=> ####
05-06 14:01:35.573 I/TAG(5879): getView #14 VT=1 CV=TextView text=> ####
05-06 14:01:37.237 I/TAG(5879): getView #15 VT=1 CV=TextView text=> ####
正如你可能已經瞭解，我的佈局l項目是TextViews，分隔符佈局是一個LinearLayout。如您所見，一個「真實」物品（日誌中的VT=1，請參閱物品＃13）正在回收分隔物視圖（CV=LinearLayout）。我原以爲Android會提供convertView相同的類型，所以只有當滾動時必須創建相同類型的視圖（即另一個分隔符）時纔會回收第一個分隔符。
你應該接受這些答案之一。 – 2013-05-08 14:00:06
我知道，但直到現在我還沒有。 – 2013-05-08 15:06:26