所以我有一个listView，我用静态xml填充，但在xml中我有一个动态容器，当用户点击listView中的项目时，我会将项目膨胀。
基本上我正在膨胀的视图看起来像（x）数量的单选按钮和textView。
我必须这样做的原因是膨胀的单选按钮的数量可能会根据它是什么类型的列表项而改变。
我遇到的问题是，一旦单选按钮膨胀并且用户选择了一个按钮，该列表就不会保存用户上次选择单选按钮的状态。或者更确切地说，它将单选按钮状态循环到列表中的另一个位置。这有点正确，因为这是listview所做的。我希望它只在用户在listView中选择的位置保存用户选择的答案。
我已经在这方面工作了大约一个星期，但找不到一个好的解决方案。如果有人愿意帮助我会非常感激。我将在下面发布相关代码。
SurveyView（将视图扩展为自定义容器）
public class SurveyView extends LinearLayout {
private LinearLayout pollContainer;
private Context context;
private String type;
private int numOfAnswers;
private ListView answersList;
private ArrayList<String> answers;
private boolean visibility = true;
private OnClickListener listener;
private ArrayList<View> options;
private static int tag = 88888888;
private ArrayList<Boolean> checked;
private Integer[] percent = {33, 25, 15, 20, 7};
private int position;
/**
* @param context the context of the activity
* @param type the type of poll
* @param numOfAnswers if the poll is multiple choice (most likely) provide number of answers.
*/
public void setLayout(final Context context, String type, int numOfAnswers, final int position) {
this.type = type;
this.numOfAnswers = numOfAnswers;
this.context = context;
this.position = position;
switch (type) {
case "Multiple":
if (visibility) {
for (int i = 0; i < numOfAnswers; i++) {
View v = LayoutInflater.from(getContext()).inflate(R.layout.poll_multiple_choice_answers_row, null);
View space = LayoutInflater.from(getContext()).inflate(R.layout.space, null);
v.setTag(tag);
options.add(v);
final RadioButton rb = (RadioButton) v.findViewById(R.id.answer_voted_button);
rb.setClickable(false);
rb.setFocusable(false);
tag++;
addView(v);
addView(space);
}
}
break;
case "Slider":
break;
case "Tree":
break;
case "Sentiment":
break;
}
}
public SurveyView(Context context, AttributeSet attrs) {
super(context, attrs);
setOrientation(VERTICAL);
options = new ArrayList<>();
}
public boolean isVisibility() {
return visibility;
}
public void setVisibility(boolean visibility) {
this.visibility = visibility;
}
public void setAnswers(int position) {
RadioButton rb;
for (int i = 0; i < options.size(); i++) {
if (i != position) {
rb = (RadioButton) options.get(i).findViewById(R.id.answer_voted_button);
rb.setChecked(false);
}
else {
rb = (RadioButton) options.get(position).findViewById(R.id.answer_voted_button);
rb.setChecked(true);
for (int p = 0; p < options.size(); p++) {
TextView answer = (TextView) options.get(p).findViewById(R.id.poll_answer);
answer.setText("Abraham Lincoln");
TextView tv = (TextView) options.get(p).findViewById(R.id.answer_percent);
tv.setText(Integer.toString(percent[p]));
options.get(p).setBackground(new PercentDrawable(percent[p], context.getResources().getColor(R.color.icitizen_poll_opaque_gold)));
}
}
}
}
列表视图的适配器
PollsAdapter extends BaseAdapter {
private LayoutInflater inflater;
private Context context;
private ArrayList<Card> data;
private ArrayList<RelativeLayout.LayoutParams> params;
private ArrayList<Integer> pollAnswers;
private int selectedPosition = 0;
public PollsAdapter(Context context, ArrayList<Card> data,
ArrayList<RelativeLayout.LayoutParams> params,
ArrayList<Integer> pollAnswers) {
this.context = context;
this.data = data;
inflater = LayoutInflater.from(context);
this.params = params;
this.pollAnswers = pollAnswers;
}
public static class ViewHolder {
TextView type;
TextView time;
TextView text;
TextView space;
TextView pollSpace;
ImageView type_icon;
SurveyView answerView;
RadioButton rb;
ArrayList<View> options;
private ViewHolder() {
}
private ViewHolder(TextView type, TextView time, TextView text, ImageView type_icon, SurveyView answerView) {
this.type = type;
this.time = time;
this.text = text;
this.type_icon = type_icon;
this.answerView = answerView;
}
public TextView getType() {
return type;
}
public void setType(TextView type) {
this.type = type;
}
public TextView getTime() {
return time;
}
public void setTime(TextView time) {
this.time = time;
}
public TextView getText() {
return text;
}
public void setText(TextView text) {
this.text = text;
}
public ImageView getType_icon() {
return type_icon;
}
public void setType_icon(ImageView type_icon) {
this.type_icon = type_icon;
}
public SurveyView getAnswerView() {
return answerView;
}
public void setAnswerView(SurveyView answerView) {
this.answerView = answerView;
}
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.polls_card_layout, null);
viewHolder.type = (TextView)convertView.findViewById(R.id.card_type);
viewHolder.time = (TextView)convertView.findViewById(R.id.card_poll_time);
viewHolder.text = (TextView)convertView.findViewById(R.id.card_text);
viewHolder.space = (TextView)convertView.findViewById(R.id.card_space);
viewHolder.pollSpace = (TextView)convertView.findViewById(R.id.poll_space);
viewHolder.type_icon = (ImageView)convertView.findViewById(R.id.card_icon);
viewHolder.answerView = (SurveyView)convertView.findViewById(R.id.poll_component);
viewHolder.rb = (RadioButton)viewHolder.answerView.findViewById(R.id.answer_voted_button);
convertView.setTag(viewHolder);
}
else {
viewHolder = (ViewHolder)convertView.getTag();
}
viewHolder.type.setText(data.get(position).getType());
viewHolder.time.setText(data.get(position).getTime());
viewHolder.text.setText(data.get(position).getText());
viewHolder.answerView.setLayoutParams(params.get(position));
viewHolder.answerView.setLayout(context, "Multiple", 5, position);
viewHolder.answerView.setVisibility(false);
viewHolder.answerView.setAnswers(pollAnswers.get(position));
return convertView;
}
listview的片段
SurveyListFragment extends ListFragment {
private ArrayList<Card> cardList;
private PollsAdapter adapter;
private ArrayList<Answer> answers;
ArrayList<Integer> visible;
private ArrayList<RelativeLayout.LayoutParams> params;
private ArrayList<Integer> pollAnswers;
/**
when user clicks on a poll display the poll options for it
*/
@Override
public void onListItemClick(ListView l, View view, final int position, long id) {
final PollsAdapter.ViewHolder holder = (PollsAdapter.ViewHolder)adapter.getView(position, view, l).getTag();
if (holder.getAnswerView().getHeight() == 0) {
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.BELOW, R.id.poll_space);
params.addRule(RelativeLayout.RIGHT_OF, R.id.card_icon);
//holder.getAnswerView().setLayoutParams(params);
this.params.set(position, params);
for (int i = 0; i < holder.getAnswerView().getOptions().size(); i++) {
holder.getAnswerView().getOptions().get(i).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
for (int p = 0; p < holder.getAnswerView().getOptions().size(); p++) {
if (holder.getAnswerView().getOptions().get(p) == v) {
holder.getAnswerView().setAnswers(p);
pollAnswers.set(position, p);
adapter = new PollsAdapter(getActivity(), cardList, SurveyListFragment.this.params, pollAnswers);
setListAdapter(adapter);
}
}
}
});
}
}
else {
holder.getAnswerView().setVisibility(false);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 0);
params.addRule(RelativeLayout.BELOW, R.id.poll_space);
params.addRule(RelativeLayout.RIGHT_OF, R.id.card_icon);
this.params.set(position, params);
// holder.getAnswerView().setLayoutParams(params);
adapter.notifyDataSetChanged();
}
super.onListItemClick(l, view, position, id);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setListAdapter(adapter);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
cardList = new ArrayList<>();
answers = new ArrayList<>();
visible = new ArrayList<>();
params = new ArrayList<>();
pollAnswers = new ArrayList<>();
Answer answer = new Answer();
answer.setText("one");
answers.add(answer);
answer = new Answer();
answer.setText("two");
answers.add(answer);
answer = new Answer();
answer.setText("three");
answers.add(answer);
answer = new Answer();
answer.setText("four");
answers.add(answer);
Card card = new Card();
card.setType("Polls");
card.setText("What issue listed below would you like to see as a priority for Nashville’s next mayor?");
card.setTime("Closing Soon");
for (int i = 0; i < cardList.size(); i++) {
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 0);
params.addRule(RelativeLayout.BELOW, R.id.poll_space);
params.addRule(RelativeLayout.RIGHT_OF, R.id.card_icon);
this.params.add(params);
pollAnswers.add(-1);
}
adapter = new PollsAdapter(getActivity(), cardList, params, pollAnswers);
}
答案 0 :(得分：0)
在创建convertView时将调查对象解析为视图类。每次回收以前的视图时解析一个新对象。这是一些代码。
1）初始化ProductListItemView
中的视图public ProductListItemView(Context context, ProductItem item) {
super(context);
mProductItem = item;
initView(context);
}
/**
* This function sets up all the Views contained in the FrameLayout
*
* @param context
*/
private void initView(Context context) {
addView(LayoutInflater.from(context).inflate(R.layout.list_item_product, null));
ButterKnife.inject(this);
if (mProductItem != null) {
setProductItem(mProductItem);
}
}
2）将对象设置为视图
public void setProductItem(final ProductItem item) {
/**
* Clear Listener. Important!! Cause by Android Recycle View
* Do whatever you want to reset the recycled view or new view
*/
mPurchase.setOnClickListener(null);
endorsed_by_image.setVisibility(INVISIBLE);
endorsed_by_name.setVisibility(INVISIBLE);
mBtnEndorse.setOnCheckedChangeListener(null);
mProductItem = item;
mProductName.setText(mProductItem.getName());
3）在适配器中
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ProductItem item = mProducts.get(position);
if (convertView == null) {
convertView = new ProductListItemView(getActivity(), item);
} else {
((ProductListItemView) convertView).setProductItem(item);
}
}
希望我能解释清楚。
在getView（）中，最好实现ViewHolder。访问http://www.javacodegeeks.com/2013/09/android-viewholder-pattern-example.html