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我正在嘗試爲微調框實現「更多」按鈕。基本上我只想先顯示幾個項目，當用戶點擊最後一個項目時（「更多...」），微調器將改變並顯示所有項目。Android：更改微調項目而不關閉微調框
因此，我需要的功能是一種動態更改微調項目而不需要關閉微調項目的方法。我已經設法做了一切，但最後一部分。每當我更改項目時，微調器自動關閉（不失焦點）。
我認爲唯一的解決方法是使用mSpinner.performClick()在關閉後立即打開微調器。當然，這還不夠好，因爲我得到了這個快速接近重新開放的效果。不酷。
我創建的管理邏輯的自定義微調類：
public class ReservationStatusSpinner extends Spinner {
// --------------------------------------------------
// State
// --------------------------------------------------
private final String mMoreStatus;
private OnItemSelectedListener mUserListener;
private ArrayAdapter<String> mAdapter;
private boolean mOpenInitiated = false;
// --------------------------------------------------
// Interfaces
// --------------------------------------------------
private interface OnSpinnerEventsListener {
// Not needed, but may be needed in the future -> void onSpinnerOpened();
void onSpinnerClosed();
}
private OnSpinnerEventsListener mOnSpinnerEventsListener;
public interface OnStatusSelectedListener {
void onStatusSelected(String status);
}
private OnStatusSelectedListener mOnStatusSelectedListener;
// --------------------------------------------------
// Construction/Initialization
// --------------------------------------------------
public ReservationStatusSpinner(Context context) {
super(context);
mMoreStatus = getContext().getResources().getString(R.string.status_more);
init();
}
public ReservationStatusSpinner(Context context, AttributeSet attrs) {
super(context, attrs);
mMoreStatus = getContext().getResources().getString(R.string.status_more);
init();
}
private void init() {
// Add listener
super.setOnItemSelectedListener(new OnItemSelected());
mOnSpinnerEventsListener = new OnSpinnerEventsListener() {
@Override
public void onSpinnerClosed() {
filterAndSelect();
}
};
}
// --------------------------------------------------
// Overridden methods
// --------------------------------------------------
@Override
public boolean performClick() {
// register that the Spinner was opened so we have a status
// indicator for the activity(which may lose focus for some other
// reasons)
mOpenInitiated = true;
return super.performClick();
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
// mSpin is our custom Spinner
if (mOpenInitiated && hasFocus) {
performClosedEvent();
}
}
@Override
public void setOnItemSelectedListener(OnItemSelectedListener l) {
mUserListener = l;
}
// --------------------------------------------------
// Private methods
// --------------------------------------------------
private static ArrayList<String> getAllStatuses(Context context) {
ArrayList<String> items = new ArrayList<>();
CharSequence[] statusesCSArray = context.getResources().getTextArray(R.array.reservation_status);
for (CharSequence cs : statusesCSArray)
items.add(cs.toString());
return items;
}
private void performClosedEvent() {
mOpenInitiated = false;
if (mOnSpinnerEventsListener != null) {
mOnSpinnerEventsListener.onSpinnerClosed();
}
}
private void filterAndSelect() {
List<String> items = filterStatuses((String)getSelectedItem(), mMoreStatus);
setItems(items);
setSelection(0);
}
// --------------------------------------------------
// Public methods
// --------------------------------------------------
public void setStatus(String status) {
// Find status in adapter
int pos = -1;
for (int i = 0; i < mAdapter.getCount(); ++i) {
if (mAdapter.getItem(i).equals(status)) {
pos = i;
break;
}
}
if (pos != -1)
setSelection(pos);
}
public void setAdapter(ArrayAdapter<String> adapter) {
super.setAdapter(adapter);
mAdapter = adapter;
}
public void setOnStatusSelectedListener(OnStatusSelectedListener l) {
mOnStatusSelectedListener = l;
}
public void setItems(List<String> items) {
mAdapter.clear();
mAdapter.addAll(items);
mAdapter.notifyDataSetChanged();
}
// --------------------------------------------------
// Utilities
// --------------------------------------------------
public static ArrayList<String> filterStatuses(String selectedStatus, String moreStatus) {
ArrayList<String> list = new ArrayList<>(DataUtilities.filterStatuses(selectedStatus));
// Add selected status at start
list.add(0, selectedStatus);
// Append "More"
list.add(moreStatus);
return list;
}
// --------------------------------------------------
// Custom ItemSelectedListener for ReservationStatusSpinner
// --------------------------------------------------
private class OnItemSelected implements OnItemSelectedListener {
private String mPreviousStatus;
private boolean mMoreClicked = false;
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String more = getContext().getResources().getString(R.string.status_more);
String status = getSelectedItem().toString();
ArrayList<String> items = new ArrayList<>();
if (status.equals(more)) {
items.addAll(getAllStatuses(getContext()));
items.remove(mMoreStatus);
setItems(items);
//setStatus(mPreviousStatus);
mMoreClicked = true;
// Reopen spinner (it closes after changing data) (TODO: Fix this)
ReservationStatusSpinner.this.performClick();
} else if (!mMoreClicked) {
filterAndSelect();
}
if (!status.equals(more)) {
if (mUserListener != null)
mUserListener.onItemSelected(parent, view, position, id);
if (mOnStatusSelectedListener != null)
mOnStatusSelectedListener.onStatusSelected(status);
}
mPreviousStatus = status;
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
if (mUserListener != null)
mUserListener.onNothingSelected(parent);
}
}
}
和一個自定義適配器：
public class ImageSpinnerAdapter extends ArrayAdapter<String> {
private LayoutInflater mInflater;
public ImageSpinnerAdapter(Context context, int textViewResourceId, List<String> titles) {
super(context, textViewResourceId, titles);
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getDropDownView(int position, View convertView, @NonNull ViewGroup parent) {
View view;
if (convertView == null) {
view = mInflater.inflate(R.layout.row_image_spinner_dropdown, parent, false);
} else {
view = convertView;
}
ImageView icon = (ImageView)view.findViewById(R.id.spinner_icon);
setIcon(icon, getItem(position));
TextView text = (TextView)view.findViewById(R.id.spinner_status_text);
text.setText(DataUtilities.addWhitespacesToStatus(getItem(position)));
view.setPadding(0, 0, 0, 0);
return view;
}
@NonNull
@Override
public View getView(int position, View convertView, @NonNull ViewGroup parent) {
View view;
if (convertView == null) {
view = mInflater.inflate(R.layout.row_image_spinner_view, parent, false);
} else {
view = convertView;
}
// Set icon
ImageView icon = (ImageView)view.findViewById(R.id.spinner_icon);
setIcon(icon, getItem(position));
view.setPadding(0, 0, 0, 0);
return view;
}
private void setIcon(ImageView icon, String status) {
// Make sure there are no whitespaces in status
status = DataUtilities.removeWhitespaceFromStatus(status);
// Get the correct image for each status
icon.setImageResource(DataUtilities.statusToIconResource(status));
}
}
在我的微調，大部分工作是在private class OnItemSelected末完成的片段。
起初我以爲問題是我的適配器的轉換視圖（我起初沒有使用轉換視圖模式），但你可以看到我現在正在使用它。
該問題出現在2個不同的設備和我的模擬器上，因此可以安全地假定它不是設備特定的問題。
任何人有任何想法或任何指針？
因此，無法動態地添加/刪除微調項目中的項目嗎？ – TheCrafter
@TheCrafter - 對於添加/刪除，您必須從arraylist中添加/刪除並在itemSelected（）方法上調用notifyDataSetChanged（）。 – Ragini
我已經這樣做了。它確實更新了適配器數據集，但自動關閉了微調器。我正在尋找一種方法來做到這一點，而不關閉微調。 – TheCrafter