Question

我必须在ListView中选择复选框。现在，当我选中复选框时，下面的一些复选框会自动检查。这是我的代码：

StudentAdapter.java：

public class StudentAdapter extends BaseAdapter{
private Activity activity;
private List<StudentBean> studentBeanList;
private boolean checked = false;
CheckBox checkBox;
public StudentAdapter(Activity activity, List<StudentBean> studentBeanList){
    super();
    this.studentBeanList = studentBeanList;
    this.activity = activity;
}
@Override
public int getCount() {
    return studentBeanList.size();
}
@Override
public Object getItem(int position) {
    return studentBeanList.get(position);
}
@Override
public long getItemId(int position) {
    return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    StudentAdapter.ItemHolder itemHolder= new StudentAdapter.ItemHolder();
    if (convertView==null) {
        LayoutInflater li = (LayoutInflater)
                (activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE));

        convertView = li.inflate(
                R.layout.row_student, null);
       itemHolder.textViewStudent = (TextView) convertView
                .findViewById(R.id.tvstudentname);
        convertView.setTag(itemHolder);
        itemHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox1);
        convertView.setTag(itemHolder);
    }
    else
    {
        itemHolder = (StudentAdapter.ItemHolder) convertView.getTag();

    }
    if (studentBeanList != null && !studentBeanList.isEmpty())
    {
        final StudentBean studentBean = studentBeanList.get(position);
        if (studentBean != null) {
            if
                    (itemHolder.textViewStudent != null && studentBean.getStudentname() != null)
            {
               itemHolder.textViewStudent.setText(studentBean.getStudentname());
            }
        }
    }
    return convertView;
}
private class ItemHolder {
    TextView textViewStudent;
    CheckBox checkBox;
}
@Override
public void notifyDataSetChanged() {
    super.notifyDataSetChanged();
    // Your code to nofify
}
}

我在XML下面充气..

row_student.xml

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
    android:id="@+id/tvstudentname"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView"
    android:padding="10dp"
    android:layout_alignBaseline="@+id/checkBox1"
    android:layout_alignBottom="@+id/checkBox1"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_toLeftOf="@+id/checkBox1"
    android:layout_toStartOf="@+id/checkBox1" />
<CheckBox
    android:id="@+id/checkBox1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />
 </RelativeLayout>

我无能为力。如何选择全选，仅选择一个（我的意思是当用户选择一个，其他选择自动），选择全部但逐个。在此先感谢..

这是新代码

 public class StudentAdapter extends BaseAdapter{
private Activity activity;
private StudentBean studentBean;
private List<StudentBean> studentBeanList;
public StudentAdapter(Activity activity, List<StudentBean> studentBeanList){
    super();
    this.studentBeanList = studentBeanList;
    this.activity = activity;

}

@Override
public int getCount() {
    return studentBeanList.size();
}

@Override
public Object getItem(int position) {
    return studentBeanList.get(position);
}

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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    StudentAdapter.ItemHolder itemHolder= new StudentAdapter.ItemHolder();
    if (convertView==null) {
        LayoutInflater li = (LayoutInflater)
                (activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE));

        convertView = li.inflate(
                R.layout.row_student, null);

        itemHolder.textViewStudent = (TextView) convertView
                .findViewById(R.id.tvstudentname);
        convertView.setTag(itemHolder);
        itemHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox1);
        convertView.setTag(itemHolder);
        itemHolder.checkBox.setChecked(studentBean.isChecked());
        itemHolder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                studentBean.setChecked(holder.checkBox.isChecked());
            }
        });
    }

    else

    {
        itemHolder = (StudentAdapter.ItemHolder) convertView.getTag();

    }

    if (studentBeanList != null && !studentBeanList.isEmpty())
    {
        final StudentBean studentBean = studentBeanList.get(position);
        if (studentBean != null) {
            if
                    (itemHolder.textViewStudent != null && studentBean.getStudentname() != null)
            {
                itemHolder.textViewStudent.setText(studentBean.getStudentname());
            }
        }
    }

    return convertView;
}

private class ItemHolder {
    TextView textViewStudent;
    CheckBox checkBox;
}

@Override
public void notifyDataSetChanged() {
    super.notifyDataSetChanged();
    // Your code to nofify
}

}

Answer 1

为此，在 StudentBean pojo类中添加一个布尔字段，并为该默认值设置getter setter布尔值为false。

private boolean checked = false;
   public boolean isChecked() {
        return checked;
    }

    public void setChecked(boolean checked) {
        this.checked = checked;
    }

现在在适配器中添加以下代码

 itemHolder.checkBox.setChecked(studentBean.isChecked());
 itemHolder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                studentBean.setChecked(holder.checkBox.isChecked());
            }
        });

它的工作正常。

Answer 2

试试这个：

public class StudentAdapter extends BaseAdapter{
private Activity activity;
private boolean multiSelection = true;
private int selectedPosition = -1;
private List<StudentBean> studentBeanList;
public StudentAdapter(Activity activity, List<StudentBean> studentBeanList){
    this.studentBeanList = studentBeanList;
    this.activity = activity;
}
@Override
public int getCount() {
    return studentBeanList.size();
}
@Override
public Object getItem(int position) {
    return studentBeanList.get(position);
}
@Override
public long getItemId(int position) {
    return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ItemHolder itemHolder;
    if (convertView == null) {
        LayoutInflater li = (LayoutInflater)
                (activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE));
        convertView = li.inflate(R.layout.row_student, null);
        itemHolder = new StudentAdapter.ItemHolder();
        itemHolder.textViewStudent = (TextView) convertView.findViewById(R.id.tvstudentname);
        itemHolder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox1);
        convertView.setTag(itemHolder);
    } else {
        itemHolder = (StudentAdapter.ItemHolder) convertView.getTag();
    }
    itemHolder.checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            CheckBox cb = (CheckBox) view;
            int pos = (Integer) cb.getTag();
            StudentBean studentBean = studentBeanList.get(pos);
            studentBean.setChecked(cb.isChecked());
            if(!multiSelection && selectedPosition != -1){
                StudentBean previousStudentBean = studentBeanList.get(selectedPosition);
                previousStudentBean.setChecked(false);
                notifyDataSetChanged();
                selectedPosition = pos;
            }
        }
    });
    if (studentBeanList != null && !studentBeanList.isEmpty()) {
        StudentBean studentBean = studentBeanList.get(position);
        if (studentBean != null) {
            if (itemHolder.textViewStudent != null && studentBean.getStudentname() != null) {
                itemHolder.textViewStudent.setText(studentBean.getStudentname());
                itemHolder.checkBox.setChecked(studentBean.isChecked());
            }
        }
    }
    itemHolder.checkBox.setTag(position);
    return convertView;
}
private class ItemHolder {
    TextView textViewStudent;
    CheckBox checkBox;
}
@Override
public void notifyDataSetChanged() {
    super.notifyDataSetChanged();
    // Your code to notify
}
public void selectAll() {
    multiSelection = true;
    for(int i=0; i<studentBeanList.size(); i++){
        studentBeanList.get(i).setChecked(true);
    }
    notifyDataSetChanged();
}
public void changeSelectMode(boolean enableMultiSelection){
    multiSelection = enableMultiSelection;
}
}

你需要在你的活动/片段中找到一些东西，然后选择全部＆＃34;和＆＃34;更改选择模式＆＃34;。我有一个关于ListView的博客，http://programandroidlistview.blogspot.com/

希望这有帮助！

在ListView中选择复选框[（选择多个复选框，但逐个选中），一次选择全部，一次只选一个]

2 个答案: