Android：wrap_content 不适用于 ListView
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Android: wrap_content is not working with ListView
提问by user1471575
I am working on android. I want my list view to wrap its content horizontally and not to fill all the width. The wrap_content properties is not working. What to do?
我在安卓上工作。我希望我的列表视图水平包装其内容而不是填充所有宽度。wrap_content 属性不起作用。该怎么办？
回答by Jaydipsinh Zala
In order achieve wrap_contentheight in ListView, we need to use CustomListViewthat extendsour native ListView.
为了实现wrap_content高度ListView，我们需要使用CustomListView的是extends我们的母语ListView。
MyListView.java
MyListView.java
public class MyListView extends ListView {
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyListView(Context context) {
super(context);
}
public MyListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}
in your layoutuse custom view like this,
在您layout像这样使用自定义视图中，
layout.xml
布局文件
<com.yourpackagename.MyListView
...
android:layout_width="match_parent"
android:layout_height="wrap_content"
... />
回答by K_Anas
As Romain Guy(Google Engineer works on UI toolkit) Said in his post
正如Romain Guy（谷歌工程师从事 UI 工具包工作）在他的帖子中所说
By setting the width to wrap_contentyou are telling ListView to be as wide as the widest of its children. ListView must therefore measure its items and to get the items it has to call getView() on the Adapter. This may happen several times depending on the number of layout passes, the behavior of the parent layout, etc.
通过将宽度设置为wrap_content您告诉 ListView 与其最宽的孩子一样宽。因此，ListView 必须测量它的项并获取它必须在适配器上调用 getView() 的项。这可能会发生多次，具体取决于布局传递的数量、父布局的行为等。
So if you set the layout width or layout height of your ListView to wrap_contentthe ListView will try to measure every single view that is attached to it - which is definitely not what you want.
因此，如果您将 ListView 的布局宽度或布局高度设置wrap_content为 ListView 将尝试测量附加到它的每个视图 - 这绝对不是您想要的。
Keep in mind:avoid setting wrap_contentfor ListViews or GridViews at all times, for more details see this Google I/O videotalking about the world of listview
请记住：wrap_content始终避免设置ListViews 或 GridViews，有关更多详细信息，请参阅此Google I/O 视频，讨论列表视图的世界
回答by david
It can be implemented by using LinearLayout.
它可以通过使用 LinearLayout 来实现。
Create like this example:
像这个例子一样创建：
public class LinearLayoutAdapter {
LinearLayout linearLayout;
ArrayList<String> arrayList
private View rootView;
private static LayoutInflater inflater;
public ChoicesAdapter_(ArrayList<String> arrayList ,LinearLayout linearLayout)
{
this.index =index;
this.arrayList=arrayList;
this.linearLayout=linearLayout;
notifyDataSetChanged();
}
private void notifyDataSetChanged() {
linearLayout.removeAllViews();
for (int i =0;i<getCount();i++){
linearLayout.addView(getView(i,null,null));
}
}
public int getCount() {
return arrayList.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
rootView = inflater.inflate(R.layout.row_list, null);
TextView textView = (TextView)rootView.findViewById(R.id.text);
textView.setText(arrayList.get(position));
return rootView;
}
}
MainActivity example:
主活动示例：
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("Accent");
arrayList.add("Acclaim");
arrayList.add("Accord");
arrayList.add("Achieva");
arrayList.add("Aerio");
arrayList.add("Aerostar");
LinearLayout linearLayout = (LinearLayout)findViewById(R.id.linearLayout);
linearLayoutAdapter= LinearLayoutAdapter(arrayList,linearLayout);
}
}
XML example:
XML 示例：
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text"
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:textColor="@color/dark_gray"
android:background="@color/white"
android:textSize="20dp"
android:text="" />
回答by Venky
I want my list view to wrap its content horizontally and not to fill all the width.
In case of List View you can't give wrap_content, because if you give wrap_content for List View only first three items(rows)will be shown rest will be ignored.. So don't use wrap_content.. Always use fill_parentor match_parent for List View
在列表视图的情况下，你不能给wrap_content，因为如果你给列表视图的 wrap_content 只显示前三个项目（行），其余的将被忽略..所以不要使用 wrap_content.. 总是使用fill_parent或 match_parent列表显示
For efficient design on List View you can see this World of ListView
为了在 List View 上进行高效设计，您可以看到这个ListView World
