android - viewholder - listview csdn




listview中的android:listview (4)

@Try尝试这个嵌套类

这适用于listView中的滚动listview或同一activity 2个listview

        <com.example.taskgrptaskslistview.NestedListView
            android:id="@+id/listviewTasks"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_marginBottom="2dp"
            android:layout_weight="1"
            android:cacheColorHint="#00000000" >
        </com.example.taskgrptaskslistview.NestedListView>
    </LinearLayout>

NestedListView:

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListAdapter;
import android.widget.ListView;

public class NestedListView extends ListView implements OnTouchListener, OnScrollListener {

private int listViewTouchAction;
private static final int MAXIMUM_LIST_ITEMS_VIEWABLE = 99;

public NestedListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    listViewTouchAction = -1;
    setOnScrollListener(this);
    setOnTouchListener(this);
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
        int visibleItemCount, int totalItemCount) {
    if (getAdapter() != null && getAdapter().getCount() > MAXIMUM_LIST_ITEMS_VIEWABLE) {
        if (listViewTouchAction == MotionEvent.ACTION_MOVE) {
            scrollBy(0, -1);
        }
    }
}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    int newHeight = 0;
    final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
    int heightSize = MeasureSpec.getSize(heightMeasureSpec);
    if (heightMode != MeasureSpec.EXACTLY) {
        ListAdapter listAdapter = getAdapter();
        if (listAdapter != null && !listAdapter.isEmpty()) {
            int listPosition = 0;
            for (listPosition = 0; listPosition < listAdapter.getCount()
                    && listPosition < MAXIMUM_LIST_ITEMS_VIEWABLE; listPosition++) {
                View listItem = listAdapter.getView(listPosition, null, this);
                //now it will not throw a NPE if listItem is a ViewGroup instance
                if (listItem instanceof ViewGroup) {
                    listItem.setLayoutParams(new LayoutParams(
                            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
                }
                listItem.measure(widthMeasureSpec, heightMeasureSpec);
                newHeight += listItem.getMeasuredHeight();
            }
            newHeight += getDividerHeight() * listPosition;
        }
        if ((heightMode == MeasureSpec.AT_MOST) && (newHeight > heightSize)) {
            if (newHeight > heightSize) {
                newHeight = heightSize;
            }
        }
    } else {
        newHeight = getMeasuredHeight();
    }
    setMeasuredDimension(getMeasuredWidth(), newHeight);
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    if (getAdapter() != null && getAdapter().getCount() > MAXIMUM_LIST_ITEMS_VIEWABLE) {
        if (listViewTouchAction == MotionEvent.ACTION_MOVE) {
            scrollBy(0, 1);
        }
    }
    return false;
}
}

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,而是采用它所需的所有大小来显示它的所有行。 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);
}

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"
    />

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复了内部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();

我尝试制作这个精确的结构( ListView里面的ListView )并且遇到了同样的问题,它只显示了内部ListView的第一项。 我通过将内部列表的layout_heightmatch_parent更改为set dp来修复它。

它似乎完全像我想要的那样工作。







listview