listview中的android:listview

Question

我正在尝试将listview放在listviewitem中.内部列表视图不应该是可滚动的,而是需要显示其所有行的所需大小.有更好的方法吗？表,网格,......？我现在面临的问题是内部列表视图没有占用它所需的空间,因此它在第一个列表项的末尾被切断.如果我尝试滚动,只是外部列表视图滚动这正是我想要的.

谢谢,我的最终解决方案是

LinearLayout layout = (LinearLayout) row.findViewById(R.id.LLBroadcasts);
layout.removeAllViews();

for (Item b : bs.getItems()) {

  View child = _inflater.inflate(R.layout.item_row, null);

  TextView tvTitle = (TextView) child.findViewById(R.id.TVItemTitle);
  tvTitle.setText(b.getTitle());

  TextView tvDesc = (TextView) child.findViewById(R.id.TVItemDescription);
  tvDesc.setText(b.getDescription());
  layout.addView(child);
}

Answer 1

从Android文档 - Listview:ListView是一个显示可滚动项列表的视图组

你真的不想滚动内部列表视图,你想滚动外部列表视图.但是我认为内部列表视图可能会因其包含的元素数量而异.

您可以使用a而不是内部列表视图

• 线性布局,请参阅本 教程或查看动态地将内容添加到线性布局？
• 表格布局

对于线性布局(一些示例代码):

// access your linear layout
LinearLayout layout = (LinearLayout)findViewById(R.id.layout);
// load the xml structure of your row
View child = getLayoutInflater().inflate(R.layout.row);
// now fill the row as you would do with listview
//e.g. (TextView) child.findViewById(...
...
// and than add it
layout.addView(child);

您应该将线性布局保存在视图支架中(请参阅查看支架图案).我认为removeAllViews()仅当当前行的内行比重用行少时才需要,所以我也会保存视图持有者中的行数.

如果内部行的最大数量不是很高,您还可以考虑在视图持有者中缓存它们以避免膨胀和findByViewId(假设在ArrayList中).

Answer 2

也许有人会发现我的解决方案很有用.它基于@ChrLipp的答案并使用LinearLayout.

public class NotScrollableListView extends LinearLayout {

private ListAdapter adapter;
private DataChangeObserver dataChangeObserver;
private Drawable divider;
private int dividerHeight;

private List<View> reusableViews = new ArrayList<>();

public NotScrollableListView(Context context) {
    super(context);
}

public NotScrollableListView(Context context, AttributeSet attrs) {
    super(context, attrs);

    setAttributes(attrs);
}

public NotScrollableListView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    setAttributes(attrs);
}

public ListAdapter getAdapter() {
    return adapter;
}

public void setAdapter(ListAdapter adapter) {
    if (this.adapter != null && dataChangeObserver != null) {
        this.adapter.unregisterDataSetObserver(dataChangeObserver);
    }

    this.adapter = adapter;
}

@Override
protected void onAttachedToWindow() {
    super.onAttachedToWindow();

    if (adapter != null) {
        dataChangeObserver = new DataChangeObserver();
        adapter.registerDataSetObserver(dataChangeObserver);

        fillContents();
    }
}

@Override
protected void onDetachedFromWindow() {
    super.onDetachedFromWindow();

    if (adapter != null) {
        adapter.unregisterDataSetObserver(dataChangeObserver);
        dataChangeObserver = null;
    }
}

private void fillContents() {

    // clearing contents
    this.removeAllViews();

    final int count = adapter.getCount();   // item count
    final int reusableCount = reusableViews.size(); // count of cached reusable views

    // calculating of divider properties
    ViewGroup.LayoutParams dividerLayoutParams = null;
    if (divider != null && dividerHeight > 0) {
        dividerLayoutParams = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, dividerHeight);
    }

    // adding items
    for (int i = 0; i < count; i++) {
        // adding item
        View converView = null;
        if (i < reusableCount) {    // we have cached view
            converView = reusableViews.get(i);
        }
        View view = adapter.getView(i, converView, this);

        if (i >= reusableCount) {   // caching view
            reusableViews.add(view);
        }

        addView(view);

        // adding divider
        if (divider != null && dividerHeight > 0) {
            if (i < count - 1) {
                ImageView dividerView = new ImageView(getContext());
                dividerView.setImageDrawable(divider);
                dividerView.setLayoutParams(dividerLayoutParams);
                addView(dividerView);
            }
        }
    }
}

private void setAttributes(AttributeSet attributes) {
    int[] dividerAttrs = new int[]{android.R.attr.divider, android.R.attr.dividerHeight};

    TypedArray a = getContext().obtainStyledAttributes(attributes, dividerAttrs);
    try {
        divider = a.getDrawable(0);
        dividerHeight = a.getDimensionPixelSize(1, 0);
    } finally {
        a.recycle();
    }

    setOrientation(VERTICAL);
}

private class DataChangeObserver extends DataSetObserver {
    @Override
    public void onChanged() {
        super.onChanged();

        fillContents();
    }

    @Override
    public void onInvalidated() {
        super.onInvalidated();

        fillContents();
    }
}
    }

    <com.sample.ui.view.NotScrollableListView
    android:id="@+id/internalList"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:divider="@color/list_divider_color"
    android:dividerHeight="@dimen/list_divider_width"
    />

Answer 3

我在我的应用程序中遇到同样的问题,但我需要使用ListView,因为它是一个共享项目,我不想复制相同的组件.所以..我只是以编程方式修改内部ListView的大小以显示所有行和..瞧!问题解决了:

ViewGroup.LayoutParams layoutParams = innerListView.getLayoutParams();
layoutParams.height = (int) context.getResources().getDimension(R.dimen.rowheight) * innerListView.getCount();
innerListView.setLayoutParams(layoutParams);
CustomAdapter adapter = new CustomAdapter(context, blabla..);
innerListView.setAdapter(adapter);

rowListView.invalidate();