Question

我是android新手。我正在努力使用listview中的复选框。默认情况下，当从MainActivity单击按钮时，我使listview中的复选框处于INVISIBLE模式。我希望listview中的所有复选框都处于VISIBLE模式，但是当我单击按钮时，复选框在所有其他行中只有一个列表行是可见的。仍然是复选框处于INVISIBLE模式。

FavouriteListAdapter

public class FavouriteListAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater mInflater;
ArrayList<FavouritesArray> mArrFavourites;
ViewHolder viewHolder;
String favId;

//Make checkbox to visible in all rows in listview
public void setcheckbox() {
    viewHolder.favCheckbox.setVisibility(View.VISIBLE);
}

public static class ViewHolder {
    public TextView favName;
    public TextView favUrl;
    public TextView favAddress;
    public CheckBox favCheckbox;
}

public FavouriteListAdapter(Context context, ArrayList<FavouritesArray> lArrFavourites) {
    mContext = context;
    mArrFavourites = lArrFavourites;
}

@Override
public int getCount() {
    if (mArrFavourites == null) {
        return 0;
    }
    return mArrFavourites.size();
}

@Override
public Object getItem(int position) {
    return null;
}

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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        viewHolder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.favouritelistadapter, parent, false);
        viewHolder.favName = (TextView) convertView.findViewById(R.id.fav_name);
        viewHolder.favUrl = (TextView) convertView.findViewById(R.id.fav_url);
        viewHolder.favAddress = (TextView) convertView.findViewById(R.id.fav_address);
        viewHolder.favCheckbox = (CheckBox) convertView.findViewById(R.id.fav_checkbox);
        viewHolder.favCheckbox .setVisibility(View.INVISIBLE);
        convertView.setTag(viewHolder);

    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    final FavouritesArray chooseService = mArrFavourites.get(position);
        viewHolder.favName.setText(chooseService.getFavouritename());
        viewHolder.favAddress.setText(chooseService.getFavouritelocation());

    viewHolder.favCheckbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                favId = chooseService.getFavouritename();
                ((MainActivity) mContext).check(favId);
            }
        }
    });
    return convertView;
}}

Answer 1

我认为你需要布尔变量 showCheckBox 并在方法 getView 中检查它的状态。
看看这个样本：

private boolean showCheckBox = false;

public void showChecBox(boolean show) {
    showCheckBox = show;
}

public View getView(final int position, View convertView, ViewGroup parent) {

    mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        viewHolder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.favouritelistadapter, parent, false);
        viewHolder.favName = (TextView) convertView.findViewById(R.id.fav_name);
        viewHolder.favUrl = (TextView) convertView.findViewById(R.id.fav_url);
        viewHolder.favAddress = (TextView) convertView.findViewById(R.id.fav_address);
        viewHolder.favCheckbox = (CheckBox) convertView.findViewById(R.id.fav_checkbox);
        convertView.setTag(viewHolder);

    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    final FavouritesArray chooseService = mArrFavourites.get(position);
    viewHolder.favName.setText(chooseService.getFavouritename());
    viewHolder.favAddress.setText(chooseService.getFavouritelocation());
    int checkBoxVisibility = showCheckBox : View.VISIBLE ? View.INVISIBLE;
    viewHolder.favCheckbox.setVisibility(checkBoxVisibility);

    viewHolder.favCheckbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                favId = chooseService.getFavouritename();
                ((MainActivity) mContext).check(favId);
            }
        }
    });
    return convertView;
}}

Answer 2

在活动中点击按钮时，您需要调用适配器的adapter.showCheckBoxes(true)。然后在该函数中将字段设置为showCheckBoxes=true;，并使用notifyDataSetChanged()刷新列表，这将导致为所有行调用getView方法。在getView中检查showCheckBoxes是否为true，并相应地显示复选框。

    public class FavouriteListAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater mInflater;
ArrayList<FavouritesArray> mArrFavourites;
ViewHolder viewHolder;
String favId;
boolean showCheckBoxes = false;
//Make checkbox to visible in all rows in listview
public void setcheckbox() {
    viewHolder.favCheckbox.setVisibility(View.VISIBLE);
}

public static class ViewHolder {
    public TextView favName;
    public TextView favUrl;
    public TextView favAddress;
    public CheckBox favCheckbox;
}

public FavouriteListAdapter(Context context, ArrayList<FavouritesArray> lArrFavourites) {
    mContext = context;
    mArrFavourites = lArrFavourites;
}

@Override
public int getCount() {
    if (mArrFavourites == null) {
        return 0;
    }
    return mArrFavourites.size();
}

@Override
public Object getItem(int position) {
    return null;
}

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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        viewHolder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.favouritelistadapter, parent, false);
        viewHolder.favName = (TextView) convertView.findViewById(R.id.fav_name);
        viewHolder.favUrl = (TextView) convertView.findViewById(R.id.fav_url);
        viewHolder.favAddress = (TextView) convertView.findViewById(R.id.fav_address);
        viewHolder.favCheckbox = (CheckBox) convertView.findViewById(R.id.fav_checkbox);
        viewHolder.favCheckbox .setVisibility(View.INVISIBLE);
        convertView.setTag(viewHolder);

    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    final FavouritesArray chooseService = mArrFavourites.get(position);
        viewHolder.favName.setText(chooseService.getFavouritename());
        viewHolder.favAddress.setText(chooseService.getFavouritelocation());
if(showCheckBoxes){
viewHolder.favCheckbox .setVisibility(VISIBLE);
}else{
viewHolder.favCheckbox .setVisibility(INVISIBLE);
}
    viewHolder.favCheckbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                favId = chooseService.getFavouritename();
                ((MainActivity) mContext).check(favId);
            }
        }
    });
    return convertView;
}}

public void showCheckBoxes(boolean showCheckBoxes){
this.showCheckBoxes=showCheckBoxes;
notifyDataSetChanged();
}

在按钮点击功能中：

void onClick(View v){
    mAdapter.showCheckBoxes(true);
}

当从Mainactivity单击按钮时，listview中的所有复选框都不会从不可见状态显示

2 个答案: