1

我有一个列表视图，其中有几行由充气机创建，每行有两个 TextView 和三个复选框。一切正常，但是当我用手指向下或向上滚动时，我注意到某些复选框会自动选中。我不知道为什么在使用滚动时会这样做。

我的代码：

  public class InteractiveArrayAdapter extends ArrayAdapter<Student> implements
    Filterable {
final String NAMESPACE = "http://ws.sams.com";
String URL = "http://88.198.82.92:8080/sams1/services/InsertDataWS?WSDL"; // usint
                                                                            // localhost
final String METHOD_NAME = "insertApsentData";
final String SOAP_ACTION = "http://ws.sams.com/insertApsentData";

List<Integer> checkBoxState = new ArrayList<Integer>(200);
// List<Integer> checkBoxState2 = new ArrayList<Integer>(200);
// List<Integer> checkBoxState3 = new ArrayList<Integer>(200);
// Set<Integer> numbers = new HashSet<Integer>();

private final List<Student> StudentNamesList; // for the student names .
private final List<Student> StudentIdsList; // for the student ids .
private final Activity context;

public InteractiveArrayAdapter(Activity context,
        List<Student> StudentNamesList, List<Student> StudentIdsList) {
    super(context, R.layout.activity_list, StudentNamesList);
    this.context = context;
    this.StudentNamesList = StudentNamesList;
    this.StudentIdsList = StudentIdsList;
}

protected Button sumbit;

class ViewHolder {
    protected TextView StudentName;
    protected TextView StudentId;
    protected CheckBox checkbox;
    protected CheckBox checkbox2;
    protected CheckBox checkbox3;
    protected TableRow row;
}

public View getView(final int position, View convertView, ViewGroup parent) {
    View view = null;
    if (convertView == null) {
        LayoutInflater inflator = context.getLayoutInflater();
        view = inflator.inflate(R.layout.rep, null);
        ViewHolder viewHolder = new ViewHolder();
        viewHolder.StudentName = (TextView) view
                .findViewById(R.id.TextView07);
        viewHolder.StudentId = (TextView) view
                .findViewById(R.id.TextView08);
        viewHolder.checkbox = (CheckBox) view.findViewById(R.id.CheckBox05);
        viewHolder.checkbox2 = (CheckBox) view
                .findViewById(R.id.CheckBox02);
        viewHolder.checkbox3 = (CheckBox) view
                .findViewById(R.id.CheckBox01);
        viewHolder.row = (TableRow) view.findViewById(R.id.TableRow05);
        // final EditText searchEdit = (EditText)
        // view.findViewById(R.id.searchlable);
        Typeface font = Typeface.createFromAsset(context.getAssets(),
                "extrafine.ttf");
        Typeface fontar = Typeface.createFromAsset(context.getAssets(),
                "extrafinear.ttf");
        viewHolder.StudentName.setTypeface(fontar);
        viewHolder.StudentId.setTypeface(font);

        sumbit = (Button) context.findViewById(R.id.sumbitbtn);

        view.setTag(viewHolder);
        viewHolder.row.setTag(StudentNamesList.get(position)); // here note
        viewHolder.checkbox.setTag(StudentNamesList.get(position));
        viewHolder.checkbox2.setTag(StudentNamesList.get(position));
        viewHolder.checkbox3.setTag(StudentNamesList.get(position));
    } else {
        view = convertView;
        ((ViewHolder) view.getTag()).checkbox.setTag(StudentNamesList
                .get(position));
        ((ViewHolder) view.getTag()).checkbox2.setTag(StudentNamesList
                .get(position));
        ((ViewHolder) view.getTag()).checkbox3.setTag(StudentNamesList
                .get(position));
        ((ViewHolder) view.getTag()).row.setTag(StudentNamesList
                .get(position));
    }

    final ViewHolder holder = (ViewHolder) view.getTag();
    holder.StudentName.setText(StudentNamesList.get(position).getName());
    holder.StudentId.setText(StudentIdsList.get(position).getName());
    holder.checkbox.setChecked(StudentNamesList.get(position).isSelected());
    holder.checkbox2
            .setChecked(StudentNamesList.get(position).isSelected());
    holder.checkbox3
            .setChecked(StudentNamesList.get(position).isSelected());

    holder.checkbox
            .setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView,
                        boolean isChecked) {

                    if (isChecked) {
                        holder.checkbox2.setChecked(false);
                        holder.checkbox3.setChecked(false);
                        holder.row.setBackgroundResource(R.drawable.green);
                    } else {

                    }

                    ((Student) holder.checkbox.getTag()).setSelected(true);

                    if (((CheckBox) holder.checkbox).isChecked()) {
                        ViewGroup row1 = (ViewGroup) holder.checkbox
                                .getParent();

                        View view1 = ((ViewGroup) row1).getChildAt(4);
                        if (view1 instanceof TextView) {

                            holder.StudentName = (TextView) view1;

                            checkBoxState.add(Integer
                                    .parseInt(holder.StudentName.getText()
                                            .toString()));
                        }

                    }

                }
            });

    holder.checkbox3
            .setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView,
                        boolean isChecked) {

                    if (isChecked) {
                        holder.row.setBackgroundResource(R.drawable.red);
                        holder.checkbox2.setChecked(false);
                        holder.checkbox.setChecked(false);
                    } else {

                    }

                    ((Student) holder.checkbox3.getTag()).setSelected(true);

                    // Toast.makeText(context,
                    // holder.text.getText().toString() ,
                    // Toast.LENGTH_SHORT).show();
                    if (((CheckBox) holder.checkbox3).isChecked()) {
                        ViewGroup row1 = (ViewGroup) holder.checkbox3
                                .getParent();

                        // for (int itemPos = 1; itemPos < ((ViewGroup)
                        // row1).getChildCount(); itemPos++) {

                        View view1 = ((ViewGroup) row1).getChildAt(4);
                        if (view1 instanceof TextView) {

                            holder.StudentName = (TextView) view1;
                            // numbers.add(Integer.parseInt(holder.StudentName.getText().toString()));}

                            checkBoxState.add(Integer
                                    .parseInt(holder.StudentName.getText()
                                            .toString()));
                        }
                        // else{
                        // checkBoxState.add(1);}

                    }

                }
            });

    holder.checkbox2
            .setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView,
                        boolean isChecked) {

                    if (isChecked) {
                        holder.row.setBackgroundResource(R.drawable.blue);
                        holder.checkbox.setChecked(false);
                        holder.checkbox3.setChecked(false);

                    } else {

                    }

                    ((Student) holder.checkbox2.getTag()).setSelected(true);

                    // Toast.makeText(context,
                    // holder.text.getText().toString() ,
                    // Toast.LENGTH_SHORT).show();
                    if (((CheckBox) holder.checkbox2).isChecked()) {
                        ViewGroup row1 = (ViewGroup) holder.checkbox2
                                .getParent();

                        // for (int itemPos = 1; itemPos < ((ViewGroup)
                        // row1).getChildCount(); itemPos++) {

                        View view1 = ((ViewGroup) row1).getChildAt(4);
                        if (view1 instanceof TextView) {

                            holder.StudentName = (TextView) view1;

                            // numbers.add(Integer.parseInt(holder.StudentName.getText().toString()));}
                            checkBoxState.add(Integer
                                    .parseInt(holder.StudentName.getText()
                                            .toString()));
                        }
                        // else{
                        // checkBoxState.add(1);}

                    }

                }
            });

    sumbit.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            for (int i = 0; i < checkBoxState.size(); i++) {

                Toast.makeText(context, checkBoxState.get(i).toString(),
                        Toast.LENGTH_SHORT).show();

                // For webservice propose

                try {

                    SoapObject request = new SoapObject(NAMESPACE,
                            METHOD_NAME);
                    PropertyInfo pi = new PropertyInfo();
                    pi.setName("SID");
                    pi.setValue(Integer.parseInt(checkBoxState.get(i)
                            .toString()));
                    pi.setType(Integer.class);

                    SharedPreferences mPrefs = context
                            .getSharedPreferences("ITeacher", 0);
                    // int str1 = mPrefs.getInt("1",0);
                    int str1 = 1;
                    PropertyInfo pi2 = new PropertyInfo();
                    pi2.setName("TID");
                    pi2.setValue(str1);
                    pi2.setType(Integer.class);

                    PropertyInfo pi3 = new PropertyInfo();
                    pi3.setName("class_id");
                    pi3.setValue(str1);
                    pi3.setType(Integer.class);

                    request.addProperty(pi);
                    request.addProperty(pi2);
                    request.addProperty(pi3);
                    final SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                            SoapEnvelope.VER11);
                    envelope.setOutputSoapObject(request);
                    final HttpTransportSE androidHttpTransport = new HttpTransportSE(
                            URL);
                    androidHttpTransport.call(SOAP_ACTION, envelope);

                }

                catch (Exception e) {
                }
            }
        }

    });

    return view;

}

}

4

3 回答 3

1

如果您在开始之前知道要检查或取消检查的项目，那么只需将其设置为您正在使用的适配器，如下所示

if (checkBoxState.contains(categories.get(position).categoryid)) {
            holder.checkbox.setChecked(true);
} else {
            holder.checkbox.setChecked(false);
}

然后继续这样的代码

holder.checkbox
                .setOnCheckedChangeListener(new OnCheckedChangeListener() {
                    public void onCheckedChanged(CompoundButton buttonView,
                            boolean isChecked) {
                        if (isChecked) {
                             checkBoxState.add(categories.get(position).categoryid);
                            } else {
                             checkBoxState.remove(categories.get(position).categoryid);
                            }
                        }
                    });
于 2013-09-04T12:41:58.140 回答
0

这是因为视图被回收。当您滚动浏览 ListView 时，会重复使用离开屏幕的视图以避免再次膨胀它们。

您可以确保getView()每次调用适配器时都在适配器的方法中正确更新复选框。否则，如果上次使用视图时已检查它们，它们将保持选中状态。

于 2013-09-04T12:42:04.787 回答
0

ListView重用行来创建新行（因此 getView 中的 convertView 参数）。在您的代码中，如果您得到一个非 null 的 convertView，您必须将其复选框选中状态更改为与新内容相关的状态。

由于正在重新绘制行，例如，第 1 行的复选框的选中状态将被复制到从第 1 行复制的行；从而将CheckBox新行的 设置为选中。

解决您的问题的工作实现将使用一个布尔值数组来存储每个复选框/es的当前状态。

boolean[] itemChecked;

然后在 getView 中，在选中的复选框上设置一个侦听器（必须使位置最终才能工作）。您还可以使用数组设置选中状态。

    cb.setOnCheckedChangeListener (new OnCheckedChangeListener () {
    public void onCheckedChanged (CompoundButton btn, boolean isChecked) {
    itemChecked[position] = isChecked;
    }
});

    cb.setChecked(itemChecked[position]);

但同样，如果列表中有大量元素，则使用数组将被认为是低效的。

于 2013-09-04T12:44:58.097 回答