Question

我有一个自定义列表视图，显示图像，文本视图和单选按钮。我需要一次只选择一个项目（即RadioButton）。我在这个列表视图中添加了一个textwatcher，一切正常。

问题出在这里

让我们假设在列表视图中我选择了第一个单选按钮。
我在EditText框中执行了搜索选项，显示它过滤了listview项目和已过滤的列表项/项目将显示在第一个位置。
此处第一个位置的过滤项目也会被检查（因为它之前被选中）

是否需要在过滤前保存单选按钮的状态？

public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    if ( row == null) {
    //  Log.d(tag,"Starting XML Row Inflation");
        LayoutInflater inflater = (LayoutInflater) this.getContext()
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(R.layout.custom_row_view_user, parent, false);
        Log.d(tag,"Successfully completed XML Row Inflation for positon"+position); 

    }

    // Get item
    final Contact contact = getItem(position);
    contactIcon = (ImageView) row.findViewById(R.id.image_icon);
    name = (TextView) row.findViewById(R.id.textviewname);
    name.setText(contact.name);

            rb = (RadioButton) row.findViewById(R.id.radiobutton1);
            rb.setEnabled(true);

    String imgFilePath = DIR + contact.imageId;
    try {

        Bitmap bitmap = BitmapFactory.decodeStream(this.context.getResources().getAssets().open(imgFilePath));
        contactIcon.setImageBitmap(bitmap);
    } catch(IOException e) {
        e.printStackTrace();
    }

    return row; 

}


// Filter function
@Override
public Filter getFilter() {
    if (filter == null) {
        filter = new ContactFilter();
    }
    return filter;
}

private class ContactFilter extends Filter {

    @Override
    protected FilterResults performFiltering(CharSequence prefix) {
        FilterResults results = new FilterResults();
        if( prefix == null || prefix.length() == 0) {
            synchronized (this) {
                results.values = originalContacts;
                results.count = originalContacts.size();
            }
        } else {
            synchronized (this) {
                String prefixString = prefix.toString().toLowerCase();
                final ArrayList<Contact> filteredItems = new ArrayList<Contact>();
                final ArrayList<Contact> localItems = new ArrayList<Contact>();
                localItems.addAll(originalContacts);
                final int count = localItems.size();
                for ( int i=0; i<count; i++) {
                    final Contact contact = localItems.get(i);
                    final String contactName = contact.name.toString().toLowerCase();
                    if ( contactName.startsWith(prefixString) ) {
                        filteredItems.add(contact);

                    } else {

                    }


                }
                results.values = filteredItems;
                results.count = filteredItems.size();
            } // end of synchronized.
        }

        return results;
    }

    @Override
    protected void publishResults(CharSequence prefix,
            FilterResults results) {
        synchronized (this) {

            @SuppressWarnings("unchecked")
            final ArrayList<Contact> localItems = (ArrayList<Contact>)results.values;
            notifyDataSetChanged();
            clear();
            for( Iterator<Contact> iterator = localItems.iterator(); iterator.hasNext();) {
                Contact index = (Contact) iterator.next();
                add(index);
            }

        } // end of syncronized

    }

}

联系人类型

public class Contact {
public String name;
public String imageId;
public String type;
public boolean isSelected;
public boolean useDefaultKey;
public boolean flag;

public Contact() {

}

public Contact(String name, String type, String resouceFilePath) {
    this.name = name;
    this.type = type;
    this.imageId = resouceFilePath;
    this.isSelected = false;
    this.useDefaultKey = true;
    this.flag = false;

}

@Override
public String toString() {
    return this.name;
}

public boolean getCheckeBoxStatus() {
    return isSelected;
}

}

我实现了LinearLayout可检查方法如下

public class CheckableLinearLayout extends LinearLayout implements Checkable{


private RadioButton rb;
public CheckableLinearLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
}



@Override
protected void onFinishInflate() {
 super.onFinishInflate();
 // find checked text view
 int childCount = getChildCount();
 for (int i = 0; i < childCount; ++i) {
     View v = getChildAt(i);
     if (v instanceof RadioButton) {
         rb = (RadioButton)v;
     }
 }
}
@Override
public boolean isChecked() {
     return rb != null ? rb.isChecked() : false; 
}

@Override
public void setChecked(boolean checked) {


    if (rb != null) {
    //  Toast.makeText(getContext(), "Clicked radio buttton", Toast.LENGTH_LONG).show();
         rb.setChecked(checked);

         }
}

@Override
public void toggle() {
    if (rb != null) {
         rb.toggle();
         rb.setChecked(false);
         }

}}

非常感谢任何帮助..

Answer 1

您必须尝试使用适配器的getView（）方法的position参数来检查radiobutton。而是尝试根据一些Id来设置radiobutton。

编辑：

通过代码研究，我发现您已经实现了这个示例：

http://tokudu.com/2010/android-checkable-linear-layout/

并且正如我之前所假设的那样，单选按钮检查状态取决于listview中行的位置，但不依赖于listview中的实际项目，其位置应在过滤器上更改。我在您的代码中做了几处更改，现在listview项目检查不是基于项目的位置，而是基于项目本身（通过匹配联系人的姓名）。

代码的变化如下：

<强> HelloListViewActivity：

lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> av, View view, int position,
                    long id) {
                o = av.getItemAtPosition(position);
                String name = ((Contact) o).name;
                selectedName = name;

ContactAdapter：

static boolean isContactChecked = false;
public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        final Contact contact = getItem(position);
        if(contact.name.equalsIgnoreCase(HelloListViewActivity.selectedName))
            isContactChecked = true;
        else
            isContactChecked= false;

CheckableLinearLayout：

@Override
    public void setChecked(boolean checked) {
        if (rb != null) {
            //  rb.setChecked(checked);
            rb.setChecked(ContactAdapter.isContactChecked);
        }
    }

在自定义列表视图中过滤后的Radiobutton状态更新

1 个答案: