我使用自定义适配器创建了一个listview。它有一个Imageview，textview和一个复选框
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<ImageView --- textView --- checkbox >
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我使用名为“mCheckStates”的SparseBooleanArray来跟踪复选框的状态。另外，我想限制用户一次只检查两个复选框。为此，我使用了一个int变量作为计数器。
但是当我滚动listView时，onCheckChangedListener被调用并且计数减少一个，有时减少两个，允许用户检查3或4个复选框。
如何阻止这种情况发生？请帮我找一个解决方案。感谢。
代码
protected class MyCustomAdapter extends ArrayAdapter<String> implements
CompoundButton.OnCheckedChangeListener {
ArrayList<String> myList;
int count = 0;
ViewHolder holder = null;
public MyCustomAdapter(Context context, int textViewResourceId,
ArrayList<String> sList) {
super(context, textViewResourceId, sList);
mCheckStates = new SparseBooleanArray(sList.size());
myList = sList;
}
private SparseBooleanArray mCheckStates;
private class ViewHolder {
TextView text;
CheckBox chkbox;
ImageView imageview;
}
@Override
public int getCount() {
return stg1.size();
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.new_search_adptr, null);
holder = new ViewHolder();
holder.text = (TextView) convertView
.findViewById(R.id.adapterText1);
holder.chkbox = (CheckBox) convertView
.findViewById(R.id.checkBox1);
holder.imageview = (ImageView) convertView
.findViewById(R.id.imageView1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.chkbox.setTag(position);
holder.chkbox.setChecked(mCheckStates.get(position, false));
holder.chkbox.setOnCheckedChangeListener(this);
holder.text.setText(stg1.get(position).toString());
holder.imageview.setImageBitmap(arr_img.get(position));
return convertView;
}
public boolean isChecked(int position) {
System.out.println("inside isChecked");
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
System.out.println("inside setChecked");
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
System.out.println("inside toggle");
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
System.out.println("\n inside onCheckedChanged: " + isChecked);
if (isChecked) {
System.out.println("inside isChecked true");
System.out.println("count= " + count);
if (count >= 2) {
// count--;
System.out.println("inside count>2: " + count);
buttonView.setChecked(false);
Toast.makeText(getApplicationContext(),
"Please select only two cars!", Toast.LENGTH_LONG)
.show();
} else {
count++;
System.out.println("inside else: " + count);
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
} else {
System.out.println("inside isChecked false" + count);
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
count--;
}
}
}
答案 0 :(得分：0)
我假设您的CustomAdapter适用于ListView。所以这就是问题，单击单元格检查更加容易。
所以你可以做的就是在你的adater上设置一个监听器：
adapter .setOnItemClickListener();
然后在活动/片段中实现onItemClickListener
它将捕获所有单元格的单击，并为您提供列表中单元格的位置。
如果在适配器中使用某些Holder类填充单元格并将其设置为单元格的标记，则可以在onItemClick方法中获取持有者：
FiltreCellHolder filtreCellHolder = null;
filtreCellHolder = (FiltreCellHolder) view.getTag();
然后根据您的全局检查列表，您可以测试是否检查了此视图，并且由于用户单击它，您可以检查/取消它：
filtreCellHolder.cellCheck.setChecked(!filtreCellHolder.cellCheck.isChecked());
adapter.notifyDataSetChanged();
答案 1 :(得分：0)
我希望这会对你有所帮助。请将此代码更改为您的格式
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public void initialize() {
count = myList.size();
thumbnailsselection = new boolean[count];
notifyDataSetChanged();
}
public int getCount() {
return arrPath.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.galleryitem, null);
holder.imageview = (ImageView) convertView
.findViewById(R.id.thumbImage);
holder.checkbox = (CheckBox) convertView
.findViewById(R.id.itemCheckBox);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.checkbox.setId(position);
holder.imageview.setId(position);
holder.imageview.setAdjustViewBounds(true);
holder.checkbox.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
CheckBox cb = (CheckBox) v;
int id = cb.getId();
if (thumbnailsselection[id]) {
cb.setChecked(false);
thumbnailsselection[id] = false;
} else {
cb.setChecked(true);
thumbnailsselection[id] = true;
}
}
});
holder.imageview.setImageBitmap(decodeFile(arrPath[position]));
// holder.imageview.setScaleType(ScaleType.FIT_XY);
// holder.imageview.setAdjustViewBounds(true);
holder.checkbox.setChecked(thumbnailsselection[position]);
holder.id = position;
return convertView;
}
}
请点击按钮
检查此条件final int len = thumbnailsselection.length;
int cnt = 0;
String selectImages = "";
path = new ArrayList<String>();
for (int i = 0; i < len; i++) {
if (thumbnailsselection[i]) {
cnt++;
selectImages = arrPath[i];
path.add(selectImages);
}
}
if (cnt == 0) {
Toast.makeText(getApplicationContext(),
"Please select at least one image",
Toast.LENGTH_LONG).show();
} else if (cnt > 5) {
Toast.makeText(getApplicationContext(),
"Please select only 5 images", Toast.LENGTH_LONG)
.show();
} else {}