Question

我遇到了以下非常奇怪的情况。我有一个列表视图，每个项目都有一个按钮。按钮执行的操作之一是更改按钮文本的颜色和大小。按下按钮时，会出现下图所示的情况。如果我按下第一个项目中的按钮，则对第一个项目执行该方法，对于在屏幕上不可见的第一个项目执行该方法。同样，如果我为第二个项目执行此操作，则在屏幕上看不到第二个项目时也会出现相同情况。我对此感到非常困惑。我尝试将onClickListener添加到我的适配器而不是单独使用该方法，我还尝试使用b.setTextSize()而不是在列表视图中查找按钮。日志记录仅返回我单击的项目，并且一切看起来都很好，但事实并非如此。

enter image description here

这是列表适配器和持有者：

＆＃13;

 class ViewHolder {
        TextView leaguetxt;
        TextView datetxt;
        TextView teamstxt;
        TextView bettxt;
        TextView betid;
        TextView typetxt;
        TextView commentstxt;
        Button oddsbtn;
        LinearLayout item;

        ViewHolder(View v) {
            leaguetxt = (TextView) v.findViewById(R.id.leaguetxt);
            datetxt = (TextView) v.findViewById(R.id.datetxt);
            teamstxt = (TextView) v.findViewById(R.id.teamstxt);
            bettxt = (TextView) v.findViewById(R.id.bettxt);
            betid = (TextView) v.findViewById(R.id.gid);
            typetxt = (TextView) v.findViewById(R.id.difficultytxt);
            commentstxt = (TextView) v.findViewById(R.id.commenttxt);
            oddsbtn = (Button) v.findViewById(R.id.oddsbutton);
            item = (LinearLayout) v.findViewById(R.id.item);
        }
    }
    private class MyListAdapter extends ArrayAdapter<TipDisplayer> {
        public MyListAdapter() {
            super(AllGameslistActivity.this, R.layout.list_item, tomee);

        }
        public MyListAdapter(ArrayList<TipDisplayer> tomee) {
            super(AllGameslistActivity.this, R.layout.list_item, tomee);
            tomee = tomee;  // declare tomee in the Adapter, don't use static

        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
             View itemView = convertView;
            TipDisplayer currentwriter = tomee.get(position);
            ViewHolder holder = null;
            if (itemView == null) {
                itemView = getLayoutInflater().inflate(R.layout.list_item, parent, false);
                holder = new ViewHolder(itemView);
                itemView.setTag(holder);
                Log.d("SETTING","new holder");

            }
            else {
                holder = (ViewHolder) itemView.getTag();
                Log.d("plzwork",ids.toString());
                if (!ids.contains(Integer.parseInt(holder.betid.getText().toString()))) {
                    //holder.oddsbtn.setTextColor(Color.parseColor("#000000"));
                    //holder.oddsbtn.setTextSize(18);
                    Log.d("doesn't contain", "doesn't contain");
                    Log.d("betid",holder.betid.getText().toString());
                    Log.d("bettxt", holder.bettxt.getText().toString());
                }
                else {
                    Log.d("recycling contains", "contains");
                    //holder.oddsbtn.setTextColor(Color.parseColor("#EB102E"));
                    //holder.oddsbtn.setTextSize(20);
                    Log.d("betid", holder.betid.getText().toString());
                    Log.d("bettxt", holder.bettxt.getText().toString());
                }
                Log.d("Recycling","recycling");

            }
            holder.item.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    LinearLayout layout = (LinearLayout) v;
                    Button b = (Button) layout.findViewById(R.id.oddsbutton);
                    ListView listView = (ListView) layout.getParent();
                    final int position = listView.getPositionForView(listView);
                    String buttontext = b.getText().toString();
                    Button lastchance = (Button) layout.findViewById(R.id.oddsbutton);
                    TextView betidtextbox = (TextView) layout.findViewById(R.id.gid);
                    String betid = betidtextbox.getText().toString();
                    TipDisplayer currentwriter = tomee.get(position + 1);
                    Log.d("plzworkkkk", newBet.toString());
                    if (ids.contains(Integer.parseInt(betid))) {
                        ids.remove(new Integer(Integer.parseInt(betid)));
                        Log.d("plzworkkkkkkk", newBet.toString());
                        currentwriter.toggleHighlighted();
                        //checkhighlight(layout);
                        Log.d("getodds", buttontext);
                        selection = "home";

                        TextView teamss = (TextView) layout.findViewById(R.id.teamstxt);
                        String teams = teamss.getText().toString();
                        Log.d("teams", teams);
                        TextView bet = (TextView) layout.findViewById(R.id.bettxt);
                        String bettxt = bet.getText().toString();
                        Log.d("btxttext", bettxt);
                        newBet.generateoddstesting(betid, buttontext, false, teams, selection, bettxt);
                        double newodds = newBet.calculateodds();
                        TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
                        TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
                        myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
                        EditText mEdit = (EditText) findViewById(R.id.editText2);
                        if (mEdit.getText().toString().length() == 0) {
                            stake = 0.00;
                            newwinnings = 0.00;
                            potentialWinnings.setText("0.00");

                        } else {
                            mEdit.addTextChangedListener(new TextWatcher() {

                                public void beforeTextChanged(CharSequence s, int start,
                                                              int count, int after) {
                                }

                                public void onTextChanged(CharSequence s, int start,
                                                          int before, int count) {
                                    if (s.length() != 0) {
                                        stake = Double.parseDouble(s.toString());
                                        double newodds = newBet.calculateodds();
                                        newwinnings = stake * newodds;
                                        TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
                                        TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
                                        myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
                                        potentialWinnings.setText(String.format("%.2f", (newwinnings)));
                                        newwinningstoString = potentialWinnings.getText().toString();

                                    } else {
                                        stake = 0.00;
                                        newwinnings = 0.00;
                                        double newodds = newBet.calculateodds();
                                        TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
                                        TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
                                        myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
                                        potentialWinnings.setText(String.format("%.2f", (newwinnings)));
                                        newwinningstoString = potentialWinnings.getText().toString();

                                    }
                                }

                                public void afterTextChanged(Editable s) {
                                }
                            });
                            //stake = Double.parseDouble(mEdit.getText().toString());
                            newwinnings = stake * newodds;
                            potentialWinnings.setText(String.format("%.2f", (newwinnings)));
                            newwinningstoString = potentialWinnings.getText().toString();


                        }
                    } else {

                        ids.add(Integer.parseInt(betid));
                        //checkhighlight(layout);
                        currentwriter.toggleHighlighted();
                        selection = "home";
                        String getodds = lastchance.getText().toString();
                        Log.d("getoddsss", getodds);
                        EditText mEdit = (EditText) findViewById(R.id.editText2);
                        if (mEdit.getText().toString().length() == 0) {
                            stake = 0.00;
                            newwinnings = 0.00;
                            TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
                            potentialWinnings.setText("0.00");
                        } else {
                            mEdit.addTextChangedListener(new TextWatcher() {

                                public void beforeTextChanged(CharSequence s, int start,
                                                              int count, int after) {
                                }

                                public void onTextChanged(CharSequence s, int start,
                                                          int before, int count) {
                                    if (s.length() != 0) {
                                        stake = Double.parseDouble(s.toString());
                                        double newodds = newBet.calculateodds();
                                        newwinnings = stake * newodds;
                                        TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
                                        TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
                                        myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
                                        potentialWinnings.setText(String.format("%.2f", (newwinnings)));
                                        newwinningstoString = potentialWinnings.getText().toString();
                                    } else {
                                        stake = 0.00;
                                        double newodds = newBet.calculateodds();
                                        newwinnings = stake * newodds;
                                        TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
                                        TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
                                        myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
                                        potentialWinnings.setText(String.format("%.2f", (newwinnings)));
                                        newwinningstoString = potentialWinnings.getText().toString();
                                    }
                                }

                                public void afterTextChanged(Editable s) {
                                }
                            });
                            stake = Double.parseDouble(mEdit.getText().toString());
                            TextView teamms = (TextView) layout.findViewById(R.id.teamstxt);
                            String teams = teamms.getText().toString();
                            Log.d("teams", teams);
                            TextView bet = (TextView) layout.findViewById(R.id.bettxt);
                            String bettxt = (String) bet.getText().toString();
                            Log.d("bettxt", bettxt);
                            newBet.generateoddstesting(betid, buttontext, true, teams, selection, bettxt);
                            double newodds = newBet.calculateodds();
                            newwinnings = stake * newodds;
                            TextView myBetOdds = (TextView) findViewById(R.id.bettingodds);
                            TextView potentialWinnings = (TextView) findViewById(R.id.potentialwinnings);
                            myBetOdds.setText("@" + String.format("%.2f", newodds) + "/1");
                            potentialWinnings.setText(String.format("%.2f", (newwinnings)));
                            newwinningstoString = potentialWinnings.getText().toString();


                        }
                    }

                }
            });





            String leaguetext = currentwriter.getLeague();
            String datetext = currentwriter.getDatetimer();
            String teamstext = currentwriter.getTeams();
            String bettext = currentwriter.getBet();
            String typetext = currentwriter.getType();
            String idtext = currentwriter.getId();
            String commentsText = currentwriter.getComments();
            String oddstext = currentwriter.getOdds();
            holder.leaguetxt.setText(leaguetext);
            holder.datetxt.setText(datetext.substring(0,datetext.lastIndexOf(":")) + " GMT");
            holder.teamstxt.setText(teamstext);
            holder.bettxt.setText(bettext);
            holder.betid.setText(idtext);
            holder.commentstxt.setText(commentsText);
            holder.oddsbtn.setText(oddstext);
            holder.typetxt.setText(typetext);
            if (typetext.equals("Low Risk")) {
                holder.typetxt.setTextColor(Color.parseColor("#067103"));
            }
            else if (typetext.equals("Medium Risk")) {
                holder.typetxt.setTextColor(Color.parseColor("#D9D216"));
            }
            else if (typetext.equals("Longshot")) {
                holder.typetxt.setTextColor(Color.parseColor("#F75528"));
            }


            return itemView;


        }
    }

    private void PopulateList() {
        ArrayAdapter<TipDisplayer> adapter = new MyListAdapter(tomee);
        final ListView list = (ListView) findViewById(R.id.mylist);
        list.setAdapter(adapter);

    }

＆＃13;

Answer 1

而不是使用lastchance.setTag("highlighted");将标记设置为突出显示。将private boolean highlighted等成员变量添加到TipCollector。

然后在您的活动中有一个onListItemClick()，它会将其切换为：

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    this.toggleHighlighted();
    myAdapter.notifyDataSetChanged();
}

在你的TipDisplayer类中：

public void toggleHighlighted() {  
  highlighed = !highlighted; 
}

然后在你的getView（）方法中你可以添加如下内容：

 if (currentwriter.isHighlighed()) { 
    change color code here 
 }

Answer 2

ListView通常包含的数据多于显示的行数。如果用户滚动列表，则行和它们的相关视图将滚动出可见区域。表示行的Java对象可以重用于新显示的行。

如果Android确定某行不再可见，它允许适配器方法的getView（）通过convertView参数重用关联的视图。

适配器可以将新数据分配给convertView的视图层次结构中包含的视图。这样可以避免膨胀XML文件并创建新的Java对象。

如果Android无法重复使用某行，则Android系统会将null传递给convertView参数。因此，适配器实现需要检查这一点。

您可以使用ViewHolder模式来解决您的问题，请查看此链接以获取参考和代码示例： http://www.vogella.com/tutorials/AndroidListView/article.html#adapterperformance_holder

Answer 3

问题是，只要第一个项目在屏幕上不可见，其布局就会被回收并用于列表视图中显示的下一个项目，这意味着如果第一个项目突出显示，则只要我们滚动到第一个不可见的项目，它也将突出显示，因为它使用突出显示的第一个项目的视图。本视频于11:45 https://www.youtube.com/watch?v=Wq2o4EbM74k解释。

为了解决这个问题，请添加以下代码：

@Override

public int getViewTypeCount() {                 

return getCount();
}

@Override
public int getItemViewType(int position) {

return position;
}

列表视图中的onclick方法的奇怪行为

3 个答案: