嗨我在listview中有复选框 我有八个选择，我希望用户只能检查四个，然后锁定复选框，除非他取消选中一个。
这是我的主要：
public class Ch2 extends Activity implements OnItemClickListener{
ListView lv;
ArrayAdapter<Model> adapter;
List<Model> list = new ArrayList<Model>();
int num;
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_ch2);
lv = (ListView) findViewById(R.id.listView2);
adapter = new cusCh2(this,getModel());
lv.setAdapter(adapter);
lv.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3) {
TextView label = (TextView) v.getTag(R.id.label);
final CheckBox checkbox = (CheckBox) v.getTag(R.id.check);
checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
if (isChecked){
Toast.makeText(getApplicationContext(),"hi",Toast.LENGTH_LONG);
// disable checkbox
}
}
});
Toast.makeText(v.getContext(), label.getText().toString()+" "+isCheckedOrNot(checkbox), Toast.LENGTH_LONG).show();
}
private String isCheckedOrNot(CheckBox checkbox) {
if(checkbox.isChecked()) {
num++;
if (num == 4) {
checkbox.setEnabled(false);
}
return "is checked";
} else
return "is not checked";
}
private List<Model> getModel() {
list.add(new Model("a"));
list.add(new Model("b"));
list.add(new Model("c"));
list.add(new Model("d"));
list.add(new Model("e"));
list.add(new Model("f"));
list.add(new Model("m"));
list.add(new Model("o"));
return list;
}
这是我的ArrayAdapter
public class cusCh2 extends ArrayAdapter<Model> {
private final List<Model> list;
private final Activity context;
boolean checkAll_flag = false;
boolean checkItem_flag = false;
public cusCh2(Activity context, List<Model> list) {
super(context, R.layout.row, list);
this.context = context;
this.list = list;
}
static class ViewHolder {
protected TextView text;
protected CheckBox checkbox;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
LayoutInflater inflator = context.getLayoutInflater();
convertView = inflator.inflate(R.layout.row, null);
viewHolder = new ViewHolder();
viewHolder.text = (TextView) convertView.findViewById(R.id.label);
viewHolder.checkbox = (CheckBox) convertView.findViewById(R.id.check);
final ViewHolder finalViewHolder = viewHolder;
final ViewHolder finalViewHolder1 = viewHolder;
final ViewHolder finalViewHolder2 = viewHolder;
viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int getPosition = (Integer) buttonView.getTag(); // Here we get the position that we have set for the checkbox using setTag.
list.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
}
});
convertView.setTag(viewHolder);
convertView.setTag(R.id.label, viewHolder.text);
convertView.setTag(R.id.check, viewHolder.checkbox);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.checkbox.setTag(position); // This line is important.
viewHolder.text.setText(list.get(position).getName());
viewHolder.checkbox.setChecked(list.get(position).isSelected());
return convertView;
}
}
这是我的模特
public class Model {
private String name;
private boolean selected;
public Model(String name) {
this.name = name;
}
public String getName() {
return name;
}
public boolean isSelected() {
return selected;
}
public void setSelected(boolean selected) {
this.selected = selected;
}
当然我有row.xml档
正如我所说，我想让我的用户最多可以检查四个盒子。
我尝试过的解决方案：
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int getPosition = (Integer) buttonView.getTag(); // Here we get the position that we have set for the checkbox using setTag.
list.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
if(!isChecked){
num++;
if(num>3){
finalViewHolder.checkbox.setChecked(false);}
if(!isChecked){
num--;
if(num<3){
finalViewHolder.checkbox.setChecked(true);}
}
}
}
});
它作为停止检查，但当我滚动列表时，我失去了我已经检查过的内容。
编辑2：
viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
int getPosition = (Integer) buttonView.getTag(); // Here we get the position that we have set for the checkbox using setTag.
list.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
Toast toast= Toast.makeText(getContext(), String.valueOf(getPosition), Toast.LENGTH_SHORT);
if (isChecked) {
num++;
l.add(String.valueOf(getPosition));
if(l.size() > 3){
finalViewHolder.checkbox.setChecked(false);
}
toast.setGravity(Gravity.TOP|Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
}
else if(!isChecked){
finalViewHolder.checkbox.setChecked(true);
}
}
});
当我滚动我失去了我已经检查过的时候
编辑2：
viewHolder.checkbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int getPosition = (Integer) v.getTag(); // Here we get the position that we have set for the checkbox using setTag.
list.get(getPosition).setSelected(finalViewHolder.checkbox.isChecked()); // Set the value of checkbox to maintain its state.
Toast toast= Toast.makeText(getContext(), String.valueOf(getPosition), Toast.LENGTH_SHORT);
if (finalViewHolder.checkbox.isChecked()) {
l.add(String.valueOf(getPosition));
toast.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
if (l.size() > 4) {
finalViewHolder.checkbox.setChecked(false);
}
if (!finalViewHolder.checkbox.isChecked()) {
finalViewHolder.checkbox.setChecked(true);
}
}
}
}
);
我希望有人可以帮助我，谢谢。
答案 0 :(得分：0)
这是因为滚动列表时setOnCheckedChangeListener将在调用getView时调用.evrytime而不是在checkBox上使用onClickListener
checkbox.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (checkbox.isChecked()) {
} else if (!checkbox.isChecked()) {
}
}
}
});
答案 1 :(得分：0)
您可以使用存储已检查项目的列表。您可以将选中的项目放入OnCheckChangelistner / OnClicklistner.iF的列表中。用户取消选中该项目，它已经在列表中，而不是从列表中删除它。并始终检查大小列表来计算项目。您可以根据需要选择列表类型： - 列表或存储ID的任何内容。
holder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
Log.e("checked : ", "Clicked on Checkbox: " +contactList.get(position).getName() +" is " + isChecked);
ContactPhone cp = contactList.get(position);
if(isChecked){
cp.setState(isChecked);
addToSelected(cp);
}else{
cp.setState(isChecked);
removeSelected(cp);
}
if(selected_contats.size() > 4){
}else{
}
}
}
});
多数民众赞成......
答案 2 :(得分：0)
好的家伙，你的时间我找到我的解决方案
即使你写了checkbox.setChecked（false）的问题; 即使没有与我的Arraylist进行检查，android仍然会被计入检查，但是当我成为setChecked（假）时，我会停止使用make list删除最后一项 现在它工作正常 这个解决方案代码
viewHolder.checkbox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int getPosition = (Integer) v.getTag();
if (finalViewHolder.checkbox.isChecked()) {
l.add(getItem(getPosition).getName());
Toast toast= Toast.makeText(getContext(),String.valueOf(l.size()), Toast.LENGTH_SHORT);
toast.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL, 0, 0);
toast.show();
if (l.size() > 4) {
finalViewHolder.checkbox.setChecked(false);
l.remove(getItem(getPosition).getName());
}
}
else if (!finalViewHolder.checkbox.isChecked()) {
l.remove(getItem(getPosition).getName());
}
list.get(getPosition).setSelected(finalViewHolder.checkbox.isChecked());
}
}
);