自定義ListView復選框選擇
[英]Custom ListView checkbox selection
問題描述
我正在嘗試檢查自定義listView項的checkbox 。
我正在嘗試在自定義列表視圖適配器上使用view.setOnClickListener 。
當我選擇listView項中的一項時，另一項也在列表的下方被選中。
我的getView代碼
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (view == null){
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
view = inflater.inflate(row, parent, false);
holder = new ViewHolder();
holder.studentName = (TextView) view.findViewById(R.id.studentName);
holder.id = (TextView) view.findViewById(R.id.studentID);
holder.checkBox = (CheckBox) view.findViewById(R.id.checkBox);
view.setTag(holder.checkBox);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (!holder.checkBox.isChecked() && view!=null) {
holder.checkBox.setChecked(true);
presentStudent.add(data.get(position));
Toast.makeText(context, "added " + data.get(position).getName(), Toast.LENGTH_SHORT).show();
}
else {
holder.checkBox.setChecked(false);
presentStudent.remove(data.get(position));
Toast.makeText(context, "removed " + data.get(position).getName(), Toast.LENGTH_SHORT).show();
}
}
});
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
if((data == null) || ((position+1) > data.size()))
return view;
studentData = data.get(position);
if ((holder.studentName != null) && null != studentData.getName()
&& studentData.getName().trim().length() > 0 )
holder.studentName.setText(Html.fromHtml(studentData.getName()));
if ((holder.id != null) && null != studentData.getAcademicId()
&& studentData.getAcademicId().trim().length() > 0 )
holder.id.setText(Html.fromHtml(studentData.getAcademicId()));
return view;
}
這是我的布局代碼：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_marginBottom="10dp"
android:text="ID: 20151057010 (057)"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/studentID"
android:layout_alignBottom="@+id/checkBox"
android:layout_alignLeft="@+id/studentName"
android:layout_alignStart="@+id/studentName" />
<ImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:id="@+id/image"
android:src="@drawable/student_icon"
android:layout_marginLeft="14dp"
android:layout_marginStart="14dp"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<CheckBox
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/checkBox"
android:layout_below="@+id/studentName"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="11dp"
android:layout_marginEnd="11dp" />
<TextView
android:id="@+id/studentName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sudarshan Mondal"
android:textSize="20sp"
android:layout_marginLeft="31dp"
android:layout_marginStart="31dp"
android:layout_alignTop="@+id/image"
android:layout_toRightOf="@+id/image"
android:layout_toEndOf="@+id/image"
android:layout_marginTop="10dp"/>
</RelativeLayout>
</LinearLayout>
我該怎么辦？
4 個解決方案
解決方案1
2 已采納 2016-10-06 04:57:13
之所以發生這種情況，是因為Listview的默認行為可以重用膨脹視圖。 使用臨時arraylist來存儲單擊的位置，並驗證相同的arraylist是否包含在getView方法內的特定位置。 在適配器類中聲明arraylist，在這里：
ArrayList<String> selectedPosition = new ArrayList<String>();
現在，按照以下方法更新getView（）方法：
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (view == null){
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
view = inflater.inflate(row, parent, false);
holder = new ViewHolder();
holder.studentName = (TextView) view.findViewById(R.id.studentName);
holder.id = (TextView) view.findViewById(R.id.studentID);
holder.checkBox = (CheckBox) view.findViewById(R.id.checkBox);
//view.setTag(holder.checkBox); No need to do this
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
if((data == null) || ((position+1) > data.size()))
return view;
studentData = data.get(position);
if ((holder.studentName != null) && null != studentData.getName()
&& studentData.getName().trim().length() > 0 )
holder.studentName.setText(Html.fromHtml(studentData.getName()));
if ((holder.id != null) && null != studentData.getAcademicId()
&& studentData.getAcademicId().trim().length() > 0 )
holder.id.setText(Html.fromHtml(studentData.getAcademicId()));
//Added Change here...Check if arraylist contains selectedposition or not?
if(selectedPosition.contains(String.valueOf(position))){
holder.checkBox.setChecked(true);
presentStudent.add(data.get(position));
}else{
holder.checkBox.setChecked(false);
presentStudent.remove(data.get(position));
}
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Simply store and check selectedPosition
if(selectedPosition.contains(String.valueOf(position)))
selectedPosition.remove(String.valueOf(position));
else
selectedPosition.add(String.valueOf(position));
//And then update adapter
notifyDataSetChanged();
}
});
return view;
}
解決方案2
0 2016-10-06 02:42:04
您已經兩次添加了setTag（），肯定是搞砸了。 第一次執行setTag（）時，您要為復選框設置標簽，而執行getTag（）時，您將使用完整的holder。
編輯：
它在滾動時重用您的視圖。 您將必須為復選框實現checkedchangelistener，並更新復選框狀態：
holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// Maintain checkbox state here, which you need to check inside view.setOnClickListener..
}
});
如果上面沒有幫助，還可以發布“行”布局。
解決方案3
0 2016-10-06 04:47:31
// Define size as per your list.
boolean[] itemChecked = new boolean[YourList.size()];
holder.ck1.setChecked(false);
// check its already checked..
if (itemChecked[position])
holder.ck1.setChecked(true);
else
holder.ck1.setChecked(false);
holder.ck1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (holder.ck1.isChecked())
itemChecked[position] = true;
else
itemChecked[position] = false;
}
});
解決方案4
0 2016-10-06 05:00:18
試試這個
private ArrayList<StudentData> selectedUserArrayList = new ArrayList<>(); // Declare globally
public static int i; // Declare globally
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (view == null){
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
view = inflater.inflate(row, parent, false);
holder = new ViewHolder();
holder.studentName = (TextView) view.findViewById(R.id.studentName);
holder.id = (TextView) view.findViewById(R.id.studentID);
holder.checkBox = (CheckBox) view.findViewById(R.id.checkBox);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
if((data == null) || ((position+1) > data.size()))
return view;
studentData = data.get(position);
viewHolder.checkbox.setOnCheckedChangeListener(null);
viewHolder.checkbox.setChecked(selectedUserArrayList.contains(user));
viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
i = user.getUserId();
selectedUserArrayList.add(user);
} else {
if (i == user.getUserId()) {
i = 0;
}
selectedUserArrayList.remove(user);
}
}
});
if ((holder.studentName != null) && null != studentData.getName()
&& studentData.getName().trim().length() > 0 )
holder.studentName.setText(Html.fromHtml(studentData.getName()));
if ((holder.id != null) && null != studentData.getAcademicId()
&& studentData.getAcademicId().trim().length() > 0 )
holder.id.setText(Html.fromHtml(studentData.getAcademicId()));
return view;
}
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