Android 列表视图问题?
我正在使用列表视图请求android的权限。我已经创建了一个自定义适配器。问题是,在列表视图中,只有适配器数组的第一个元素可见(TextView),其余项目不可见 以下是代码参考: 自定义适配器:Android 列表视图问题?,android,listview,Android,Listview,我正在使用列表视图请求android的权限。我已经创建了一个自定义适配器。问题是,在列表视图中,只有适配器数组的第一个元素可见(TextView),其余项目不可见 以下是代码参考: 自定义适配器: private class ListViewAdapter extends ArrayAdapter<String>{ private int layout; private ListViewAdapter(Context context, int res
private class ListViewAdapter extends ArrayAdapter<String>{
private int layout;
private ListViewAdapter(Context context, int resource, List<String> objects){
super(context,resource,objects);
layout = resource;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
ViewHolder mainViewHolder = null;
if(convertView == null){
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(layout,parent,false);
ViewHolder holder = new ViewHolder();
holder.textView = (TextView)convertView.findViewById(R.id.permision_list_view_text);
holder.switchCompat = (SwitchCompat)convertView.findViewById(R.id.permision_list_view_switch);
convertView.setTag(holder);
}else{
mainViewHolder = (ViewHolder)convertView.getTag();
mainViewHolder.textView.setText(getItem(position));
}
return convertView;
}
}
阵列适配器:
public void getPermissionArray(){
permissions.add("Request 1");
permissions.add("Request 2");
permissions.add("Request 3");
}
列表视图行项目布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:paddingHorizontal="20dp"
android:paddingVertical="10dp">
<TextView
android:id="@+id/permision_list_view_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="sans-serif-condensed"
android:textColor="@color/colorBlack" />
<android.support.v7.widget.SwitchCompat
android:id="@+id/permision_list_view_switch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true" />
</RelativeLayout>
感谢您的帮助。您将列表项的文本设置在错误的位置:
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View rowView = convertView;
if(rowView == null){
LayoutInflater inflater = LayoutInflater.from(getContext());
rowView = inflater.inflate(layout,parent,false);
ViewHolder holder = new ViewHolder();
holder.textView = (TextView)rowView.findViewById(R.id.permision_list_view_text);
holder.switchCompat = (SwitchCompat)rowView.findViewById(R.id.permision_list_view_switch);
rowView.setTag(holder);
}
ViewHolder holder = (ViewHolder) rowView.getTag();
// Set your permission data here using holder
return rowView;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
ViewHolder mainViewHolder = null;
if(convertView == null){
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(layout,parent,false);
ViewHolder holder = new ViewHolder();
holder.textView = (TextView)convertView.findViewById(R.id.permision_list_view_text);
holder.switchCompat = (SwitchCompat)convertView.findViewById(R.id.permision_list_view_switch);
convertView.setTag(holder);
}else{
mainViewHolder = (ViewHolder)convertView.getTag();
//mainViewHolder.textView.setText(getItem(position)); // not here. This else section is reached only when the rows are getting recycled.
}
mainViewHolder.textView.setText(getItem(position)); // here
return convertView;
}
}
您将列表项的文本设置在错误的位置:
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
ViewHolder mainViewHolder = null;
if(convertView == null){
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(layout,parent,false);
ViewHolder holder = new ViewHolder();
holder.textView = (TextView)convertView.findViewById(R.id.permision_list_view_text);
holder.switchCompat = (SwitchCompat)convertView.findViewById(R.id.permision_list_view_switch);
convertView.setTag(holder);
}else{
mainViewHolder = (ViewHolder)convertView.getTag();
//mainViewHolder.textView.setText(getItem(position)); // not here. This else section is reached only when the rows are getting recycled.
}
mainViewHolder.textView.setText(getItem(position)); // here
return convertView;
}
}
@Dhaval的答案应该是可行的,但我真的很惊讶地看到第一个项目被映射了。。您仅在回收的项目中调用setText,在您的情况下没有正常回收的项目,因此显示第一个项目真的很奇怪,您的列表是从底部(stackFromBottom)返回的吗。。。。@Dhaval的答案应该是可行的,但我真的很惊讶地看到第一个项目被映射了。。您仅在回收的项目中调用setText,在您的情况下没有正常回收的项目,因此显示第一个项目真的很奇怪,您的列表是从底部(stackFromBottom)返回的吗。。。。