ListView项不会将width扩展为fill_parent

时间:2012-09-24 15:36:15

标签: android android-layout android-listview width listviewitem

我有一个自定义ViewGroup,可以从ListView布局中膨胀xml。列表项布局从另一个xml文件中膨胀。所有视图都设置为fill_parentListView填充其父级,但ListView项不填充。

我已尝试将ListView放入LinearLayout并为其分配权重。试过了RelativeLayout。另外,我已经构建了ListView programmaticaly,而没有使用xml布局。在将视图添加到LayoutParams之前,甚至更改了ViewGroup

我也考虑过这些帖子:Width of clickable area in ListView w/ onListItemClickIn Android, how can I set a ListView item's height and width?Android Listview width prob

为什么物品没有扩展到填充宽度的任何想法?以及如何扩展它们?

MyViewGroup类:

public class MyViewGroup extends ViewGroup {

    public MyViewGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
        generateMyViewGroup();

    }

    private void generateMyViewGroup()
    {
        ListView main = (ListView) View.inflate(getContext(), R.layout.layout_main, null);

        main.setAdapter(new MyAdapter(getContext()));

        this.addView(main);     
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        this.getChildAt(0).layout(l, t, r, b);
    }
}

ListView xml布局:

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginRight="3dp"
    android:background="#77000000"
    android:cacheColorHint="#00000000"
    android:divider="#00000000"
    android:dividerHeight="0dp"
    android:drawSelectorOnTop="false"
    android:scrollbars="vertical" >
</ListView>

ListView项目布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_main_category"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@color/mainBackground"
    android:gravity="fill_horizontal|center_vertical"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/main_category"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:paddingBottom="7dp"
        android:paddingLeft="20dp"
        android:paddingRight="5dp"
        android:paddingTop="20dp"
        android:text="test"
        android:textColor="@color/mainCategory"
        android:textSize="15sp"
        android:textStyle="bold" />

</LinearLayout>

MyAddapter课程的一部分:

public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;

    if(null == convertView)
    {
        LayoutInflater inflater = LayoutInflater.from(context);
        convertView = inflater.inflate(R.layout.layout_main_category, null);

        viewHolder = new ViewHolder();

        viewHolder.mainItemTitle = (TextView) convertView.findViewById(R.id.main_category);

        convertView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) convertView.getTag(); 
    }

    viewHolder.mainItemTitle.setText("text");

    return convertView;
}

private static class ViewHolder {
        public TextView menuItemTitle;
}

2 个答案:

答案 0 :(得分:1)

ViewGroup并未最终正常运作。我也试过使用LinearLayout。但RelativeLayout最终正确地夸大了布局。因此,我的xml布局和适配器保持不变,但我将主类更改为扩展RelativeLayout。同时删除了onLayout()

MyView类:

public class MyView extends RelativeLayout {
    //Extra code unchanged ....

    private void generateMyView()
    {
        ListView menu = (ListView) View.inflate(getContext(), R.layout.layout_main, null);

        menu.setAdapter(new MyAdapter(getContext()));

        this.addView(menu);
    }

    //Removed onLayout()
}

答案 1 :(得分:0)

如果您覆盖onLayout,您也应该覆盖onMeasure ..几乎总是......

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
   int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
   int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
   this.setMeasuredDimension(parentWidth, parentHeight);
   // this.setLayoutParams(new 
          //   *ParentLayoutType*.LayoutParams(parentWidth,parentHeight));
   super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

如果仍然无效,请使用注释行。

更新

另一个选择是忘记onLayoutonMeasure,并覆盖onFinishInflate()并将这些行添加到其中。如果您从xml中充气MyViewGroup

protected void onFinishInflate () {
    super.onFinishInflate();
    ListView main = (ListView) View.inflate(getContext(), 
                                    R.layout.layout_main,null);
    main.setAdapter(new MyAdapter(getContext()));
    this.addView(main); 
}