android - 单击后如何将 Listview 设置为删除线项目？

Question

我在创建时的 ListView 中设置了一个字符串列表:

//set Adapter
lvAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, chosenArray);
//add to listview
lw.setAdapter(lvAdapter);

我的问题:

我想设置列表，以便在单击某个项目后，它会被划线。但是，我是 android 的新手，以前没有做过。

我失败的尝试:

根据答案，我尝试了这种方法，但它也会划掉列表中不可见的项目。

lw.setOnItemClickListener(new AdapterView.OnItemClickListener() {
  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

     //cross off
     TextView text = (TextView) view;
     text.setPaintFlags(text.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);

      }
   });

我读到过可能有一种方法可以扩展数组适配器，但我以前从未这样做过。有什么想法吗？

更新:由于我们遇到了一些问题，这里是完整的代码。一切都在 onCreate 中:

public  ArrayAdapter<String> lvAdapter;
public ArrayList<String> arrPlayers = new ArrayList<String>();


@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_pool_sheet);

 //Setup List view
 ListView lw = (ListView) findViewById(R.id.lvBouts);

 //adapter to use on ListView
 String[] chosenArray = {""};

 //convert
 if (extras != null) {
  arrPlayers = extras.getStringArrayList("arrPlayers");
 }


 //Based on array input size from main activity
 //select pre defined string arrays
 switch (arrPlayers.size()) {
   case 6:
      chosenArray = poolOfSix;
      break;
   case 7:
       chosenArray = poolOfSeven;
       break;
   case 8:
        chosenArray = poolOfEight;
        break;
   case 9:
        chosenArray = poolOfNine;
        break;
   case 10:
        chosenArray = poolOfTen;
        break;
        //no need for default since multiple choice
    }

  //set Adapter
 lvAdapter = new ArrayAdapter<String>this,Android.R.layout.simple_list_item_1,                chosenArray);
 lw.setAdapter(lvAdapter);


//List view onClick listener
 lw.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    //cross off
    TextView text = (TextView) view;
    text.setPaintFlags(text.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);

    });
}

这是它的行为:

Answer 1

更新:

然后您将需要使用自定义适配器。像这样实例化您的 ListView :

adapter = new CustomAdapter(yourArrayHere);
    listview.setAdapter(adapter);

然后您将像这样创建您的自定义适配器:

private class CustomAdapter extends BaseAdapter {

    private String[] strings;
    private ArrayList<String> selectedStrings;

    public CustomAdapter(String[] strings) {
        this.strings = strings;
        selectedStrings = new ArrayList<>();
    }

    @Override
    public int getCount() {
        return strings.length;
    }

    @Override
    public String getItem(int i) {
        return strings[i];
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder holder;
        if (view == null) {
            holder = new ViewHolder();
            view = LayoutInflater.from(viewGroup.getContext()).inflate(android.R.layout.simple_list_item_1, viewGroup, false);
            holder.text = (TextView) view;
            view.setTag(holder);
        } else {
            holder = (ViewHolder) view.getTag();
        }
        holder.text.setText(getItem(i));
        if (selectedStrings.contains(getItem(i))) {
            holder.text.setPaintFlags(holder.text.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
        } else {
            holder.text.setPaintFlags(0);
        }
        return view;
    }

    private class ViewHolder {
        TextView text;
    }

    public ArrayList<String> getSelectedStrings() {
        return selectedStrings;
    }
}

然后您的新点击将如下所示:

@Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            adapter.getSelectedStrings().add(list[i]);
            adapter.notifyDataSetChanged();
        }

现在 selectedStrings 数组列表包含您选择的所有字符串。

---

试试这个:

@Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            TextView text = (TextView) view;
            text.setPaintFlags(text.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
        }

第一行是获取行的 View (这是一个 TextView ，因为使用了简单的列表项 1)。如果您使用的是自定义 View ，比如带有图像和 TextView 的布局，那么您只需要添加:

TextView text = (TextView)view.findViewById(R.id.my_text_view);