Ich benutze einen ArrayAdapter für eine Liste meiner eigenen Art von Objekten (nur ein Typ) und ich gebe dem Benutzer eine Option zum Erstellen weiterer Elemente mehr Ansichten für diese Artikel). An einem bestimmten Punkt hat getView einen neuen "position" Index mit einem "convertView" ungleich null gesendet. Es zeigt dann die erste Ansicht in der letzten Position. Danach werden beim Scrollen alle Ansichten durcheinander gebracht. Ich nehme an, dies bedeutet, dass ich die Ansichten auf eine Weise manipulierte, die ich nicht hätte, aber ich sehe einfach nicht wo. Hier ist ein Code:Getview-Parameter "convertview" nicht Null auf neuen "Position" -Parameter
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v;
PreviewItemHolder holder = null;
// Initialize view if convertview is null
if (convertView == null) {
v = newView(parent, position);
}
// Populate from previously saved holder
else {
// Use previous item if not null
v = convertView;
}
// Populate if the holder is null (newly inflated view) OR
// if current view's holder's flag is true and requires populating
if ((holder == null) || (holder.readPopulateFlag())) {
bindView(position, v);
}
return v;
}
private View newView(ViewGroup parent, int position) {
// Getting view somehow...
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View inflatedView = inflater.inflate(R.layout.preview_element_set, parent, false);
PreviewItemHolder holder = new PreviewItemHolder();
holder.set = (Set) mSets.get(position);
holder.previewElementHolders = new ArrayList<PreviewElementHolder>();
holder.expandArea = (View) inflatedView.findViewById(R.id.expandArea);
holder.repetitionsLabel = (TextView) inflatedView.findViewById(R.id.previewRepetitionsInput);
holder.endlessInput = (CheckBox) inflatedView.findViewById(R.id.previewSetEndlessInput);
holder.nameLabel = (TextView) inflatedView.findViewById(R.id.previewSetNameLabel);
holder.commentInput = (EditText) inflatedView.findViewById(R.id.previewSetCommentInput);
holder.soundInput = (EditText) inflatedView.findViewById(R.id.previewSetSoundInput);
holder.addElementButton = (Button) inflatedView.findViewById(R.id.previewSetAddElements);
holder.expand = (View) inflatedView.findViewById(R.id.infoArea);
holder.collapse = (View) inflatedView.findViewById(R.id.collapse);
final int setsLength = holder.set.getElements().size();
for (int i = 0; i < setsLength; i++) {
AElement currElement = holder.set.getElements().get(i);
// Creating new element holder according to the type
if (currElement instanceof Rest) {
holder.previewElementHolders.add(new PreviewRestHolder());
}
else if (currElement instanceof TimeExercise) {
holder.previewElementHolders.add(new PreviewTimeExerciseHolder());
}
else if (currElement instanceof RepetitionExercise) {
holder.previewElementHolders.add(new PreviewRepetitionExerciseHolder());
}
View currLayout = inflateElement(currElement, inflater, i, holder.previewElementHolders.get(i));
// Add the child before the hairline, collapse image and the add
// button
// (3 last children of the expandArea view
((ViewGroup) holder.expandArea).addView(currLayout, ((ViewGroup) holder.expandArea).getChildCount() - CHILDREN_INDEX_AFTER_PHASES_LABEL);
}
inflatedView.setTag(holder);
return inflatedView;
}
private void bindView(int position, View inflatedView) {
final PreviewItemHolder holder = (PreviewItemHolder) inflatedView.getTag();
holder.set.setId(position);
holder.endlessInput.setChecked(holder.set.getEndless());
holder.soundInput.setText(holder.set.getSound());
holder.nameLabel.setText(holder.set.getName());
holder.commentInput.setText(holder.set.getComment());
// Make sure there is a name. If none, put default
if (holder.nameLabel.getText().equals("")) {
holder.nameLabel.setText(R.string.default_set_name);
}
// Set repetitions value according to the endless flag
if (holder.set.getEndless()) {
holder.repetitionsLabel.setText(R.string.infinity);
}
else {
holder.repetitionsLabel.setText(String.valueOf(holder.set.getRepetitions()));
}
// Set click listeners
holder.endlessInput.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// Save endless flag
holder.set.setEndless(isChecked);
// If an endless set - Dropset
if (isChecked) {
holder.repetitionsLabel.setText(R.string.infinity);
}
else {
// Regular set
holder.repetitionsLabel.setText(String.valueOf(holder.set.getRepetitions()));
}
hideShowRepsWeights(holder);
}
});
holder.repetitionsLabel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
NumericDialog instance = NumericDialog.newInstance(holder, holder.set, NumericDialog.INTEGER_MODE, Consts.SET_REPETITIONS_METHOD_NAME);
instance.show(((Activity) getContext()).getFragmentManager(), null);
}
});
holder.nameLabel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Setting flag to true to allow populating this view
holder.rePopulateFlag = true;
SetNameDialog instance = SetNameDialog.newInstance(holder.set);
instance.show(((Activity) getContext()).getFragmentManager(), null);
}
});
holder.commentInput.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (!hasFocus) {
// After focus is lost, save the text into the set
holder.set.setComment(holder.commentInput.getText().toString());
}
}
});
// TODO Change that into a dialog that allows selection of sounds
holder.soundInput.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (!hasFocus) {
// After focus is lost, save the text into the set
holder.set.setSound(holder.soundInput.getText().toString());
}
}
});
holder.expand.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Change visibility - Show expandArea and its data
holder.expandArea.setVisibility(View.VISIBLE);
holder.expand.setVisibility(View.GONE);
holder.collapse.setVisibility(View.VISIBLE);
}
});
holder.collapse.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// Change visibility - Hide expandArea and its data
holder.expandArea.setVisibility(View.GONE);
holder.collapse.setVisibility(View.GONE);
holder.expand.setVisibility(View.VISIBLE);
}
});
holder.addElementButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
AddElementDialog instance = AddElementDialog.newInstance(holder);
instance.show(((Activity) getContext()).getFragmentManager(), null);
}
});
// Populate elements
for (PreviewElementHolder elementHolder : holder.previewElementHolders) {
populateElement(elementHolder, holder);
}
// Finally hide/show if needed - Should this be put somewere else?
hideShowRepsWeights(holder);
}
Bitte sagen Sie mir, wenn Sie denken, ich sollte mehr Methoden hochladen, um die Dinge klarer zu machen.
Was ist holder.readPopulateFlag() ?? –