采用可变尺寸单元的安卓listView单元回收
采用可变尺寸单元的安卓listView单元回收
提问于 2014-01-24 23:57:19
我有一台listView。单元格的高度可变。这在回收电池时会产生一个问题--回收的电池可能高度错误。关闭回收会使滚动变得太不稳定。我如何才能在回收电池的同时获得正确的高度？
编辑:每个地方的高度都不一样。不存在可能的值的简短列表。
回答 2
Stack Overflow用户
发布于 2014-01-25 00:44:11
双电池类型
通常问题出在getView上。我不确定你真正想要的是什么，因为你没有提供你的自定义适配器。但是，我给出了一个具有两种不同单元格类型的示例，但该单元格只包含一个文本视图。
在这种情况下，所有的电池都会随着回收而完全调整。仔细阅读并扩展/修改以满足您的需求。
在你的CustomAdapter中
private final class CustomArrayAdapter extends ArrayAdapter<String> {
//the fastest is to get the layout inflater once and not each time getView is called
private LayoutInflater mInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
public CustomArrayAdapter(Context context, int resource, int textViewResourceId, String[] objects) {
super(context, resource, textViewResourceId, objects);
}
...
//here depending on the item position determine if cell is of type 1 or 2
@Override
public int getItemViewType(int position) {
if (/* your type 1 criteria is match */) {
return TYPE_1;
} else {
return TYPE_2;
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
int type = getItemViewType(position);
if (convertView == null) {
holder = new ViewHolder();
switch (type) {
case TYPE_1:
convertView = mInflater.inflate(R.layout.row_of_type_1, parent, false);
holder.text = (TextView) convertView.findViewById(R.id.textview_type_1);
break;
case TYPE_2:
convertView = mInflater.inflate(R.layout.row_of_type_2, parent, false);
holder.text = (TextView) convertView.findViewById(R.id.textview_type_2);
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
//get the text for that specific cell and set it
holder.text.setText(getMyCustomTextForThisCell());
return convertView;
}
}
static class ViewHolder {
TextView text;
}单电池类型
在这种情况下，您只需要一种类型的单元格，其中包含一个文本视图，并希望在所有单元格中放置不同长度的文本，并且单元格自动调整其高度，只需在CustomAdapter中使用以下代码
private final class CustomArrayAdapter extends ArrayAdapter<String> {
//the fastest is to get the layout inflater once and not each time getView is called
private LayoutInflater mInflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
public CustomArrayAdapter(Context context, int resource, int textViewResourceId, String[] objects) {
super(context, resource, textViewResourceId, objects);
}
...
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.row_type, parent, false);
holder.text = (TextView) convertView.findViewById(R.id.textview_in_your_row);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
//get the text for that specific cell and set it
holder.text.setText(getMyCustomTextForThisCell());
return convertView;
}
}
static class ViewHolder {
TextView text;
}单元格布局
在示例中，我给出的文件row_type.xml (您所在行的布局文件)应该如下所示：
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textview_in_your_row"
android:paddingLeft="6dp"
android:paddingRight="6dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>不要忘记android:layout_height="wrap_content"，否则单元格不会调整大小
SIDE COMMENT
这方面的评论没有讨论OP问题，但是，如果人们来这里是因为标题中的cell recycling字样，他们可能会感兴趣，因为我在这里给出了一个使用EditText回收电池的完整示例
The content of EditText contained into a Android ListView isn't saved
Stack Overflow用户
发布于 2014-01-29 06:48:24
下面是我使用Xamarin解决这个问题的方法。
public override View GetView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
int type = GetItemViewType(position);
if (convertView == null)
{
holder = new ViewHolder();
convertView = context.LayoutInflater.Inflate(Resource.Layout.my_row_layout, parent, false);
holder.myTextView = FindViewById<TextView>(Resource.Id.viewRow);
convertView.Tag = holder;
}
else
{
holder = (ViewHolder)convertView.Tag;
int heightWeWant = heights[type];
if (holder.myTextView.Height != heightWeWant) //height we have isn't what we want
{
AbsListView.LayoutParams parms = new AbsListView.LayoutParams(LinearLayout.LayoutParams.MatchParent, heightWeWant); //Width, Height //resize the view to the height we want
convertView.LayoutParameters = parms;
}
convertView.Tag = holder;
}
holder.myText = "Some text here";
return convertView;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/21336995
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