Question

我正在尝试使ListView复选框的特定（由用户选择）行变为可见。但问题是，我在列表视图中动态添加了10行，使用扩展ArrayAdapter的类，当我选择第1行，然后我的第1行，第3行，第5行等复选框变得可见。与第2行，第4行等相似。我只是希望我选择的特定行（例如位置0）显示复选框并且其余部分不可见。

public class LazyAdapter extends ArrayAdapter<RowItem> {

Context context;

public LazyAdapter(Context context, int resourceId, List<RowItem> items){
    super(context, resourceId, items);
    this.context = context;
}

public class ViewHolder{
    CheckedTextView checkbox;
    TextView title;
    TextView description;
    LinearLayout card;
}


public View getView(int position, View convertView, ViewGroup parent){
    ViewHolder holder;
    RowItem rowItem = getItem(position);

    LayoutInflater mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null){
        convertView = mInflater.inflate(R.layout.list_row, null);
        holder = new ViewHolder();
        holder.card = (LinearLayout) convertView.findViewById(R.id.card);
        holder.checkbox = (CheckedTextView)convertView.findViewById(R.id.deliverychecktext);
        holder.title = (TextView)convertView.findViewById(R.id.title);
        holder.description = (TextView)convertView.findViewById(R.id.description);

        convertView.setTag(holder);
    } else
        holder = (ViewHolder)convertView.getTag();

    //holder.image.setImageResource(rowItem.getImageId());
    holder.title.setText(rowItem.getTitle());
    holder.description.setText(rowItem.getDesc());

    Animation animation = AnimationUtils.loadAnimation(context, R.anim.card_animation);
    holder.card.startAnimation(animation);


    return convertView;
}
}

MainActivity类

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // Intialize and set the Action Bar to Holo Blue
    ActionBar actionBar = getActionBar();
    actionBar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#33b5e5" )));

    ListView lv = (ListView) findViewById(R.id.myList);
     rowItems = new ArrayList<RowItem>();

        String[] titles = {"Address1","Address2","Address3","Address4","Address5","Address6","Address7","Address8"};
        String[] descriptions = {"First Address","Second Address","Third Address","Fourth Address","Fifth Address",
                "Sixth Address","Seventh Address","Eighth Address"};
        //Populate the List
        for (int i = 0; i < titles.length; i++) {
            RowItem item = new RowItem("Delivery Address :", descriptions[i]);
            rowItems.add(item);
        }

        // Set the adapter on the ListView
        LazyAdapter adapter = new LazyAdapter(getApplicationContext(), R.layout.list_row, rowItems);
        lv.setAdapter(adapter);

        lv.setOnItemClickListener(new OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub
                CheckedTextView check = (CheckedTextView) view.findViewById(R.id.deliverychecktext);                                
                if (check.getVisibility() == 4)
                check.setVisibility(1);
                else
                    check.setVisibility(4);
                Toast.makeText(getApplicationContext(), "h u clicked : "+position, 
                           Toast.LENGTH_LONG).show();

            } 


            });

list_row.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:background="@drawable/card_no_border"
android:orientation="vertical"
android:padding="2dp" 
android:id="@+id/card">

<CheckedTextView
android:id="@+id/deliverychecktext"
 android:layout_width="fill_parent"
 android:paddingLeft="2dp"
 android:paddingRight="2dp"
 android:paddingTop="2dp"
 android:layout_height="wrap_content"
 android:checkMark="@drawable/ic_launcher"
 android:visibility="invisible"
/>

   <TextView
    android:id="@+id/title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="4dp"
    android:text="Dog Tag"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:textColor="#040404"
    android:textStyle="bold"
    android:typeface="sans" />
</LinearLayout>

activity_main.xml中

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="#e5e5e5">

<TextView android:layout_width="match_parent"
      android:layout_height="wrap_content" 
      android:text="Your Saved Address"
      android:textSize="20sp"
      android:padding="5dp"/>

<ListView
        android:id="@+id/myList"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:layout_weight="1"
        android:divider="@android:color/transparent"
        android:dividerHeight="10dp"
        android:paddingLeft="10dip"
        android:paddingRight="10dip"
        android:paddingTop="1dip"/>
</LinearLayout>

Answer 1

第一个RowItem作为类变量来存储所选项目。

private RowItem mSelectedItem = null;

前

public class LazyAdapter extends ArrayAdapter<RowItem> {
Context context;
private RowItem mSelectedItem = null;

之后，将以下侦听器添加到LazyAdapter适配器类。

/**
 * On Click Listener for the view.
 */
protected class OnViewClickListener implements
        android.view.View.OnClickListener {

    private RowItem mItem;

    public OnViewClickListener(RowItem item) {
        mItem = item;
    }

    @Override
    public void onClick(View v) {
        mSelectedItem = mItem;

        notifyDataSetChanged();
    }
}

在返回视图之前从LazyAdapter中的getView方法调用此侦听器，并为show添加逻辑并隐藏视图。

前：

    if(mSelectedItem != null && mSelectedItem == rowItem) {
        holder.checkbox.setVisibility(View.VISIBLE);
    } else {
        holder.checkbox.setVisibility(View.INVISIBLE);
    }

    convertView.setOnClickListener(new OnViewClickListener(rowItem));

    return convertView;
}

并删除您的活动中的点击列表。

关于你的活动它的工作原因是因为在渲染适配器视图时它将重用该对象，所以它就是这样发生的。现在我们在视图渲染时每次检查和更新。

替换CheckTextBox在单击时变为可见

1 个答案: