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Android 列表视图问题?_Android_Listview - Fatal编程技术网

Android 列表视图问题?

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

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 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。。。。