我膨胀了一个ListView作为PopupWindow中的contentView。 如果我没有设置宽度&高度，我看不到PopupWindow。 如果我现在就写这样的：如何在Android上的PopupWindow中设置ListView的宽度？
setWindowLayoutMode(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
布局正在设置像“FILL_PARENT”。为什么？
ListView和ListView项目的布局属性都设置为“wrap_content”。 有什么建议吗？谢谢。
这里是SimpleListView类的实现。我知道这是低效的，我很确定它包含错误，但它显示了如何测量列表视图的宽度。我也建议您阅读this article。
public class SimpleListView extends AdapterView<ListAdapter> {
private ListAdapter adapter;
private Drawable divider;
private int dividerHeight;
private boolean clipDivider;
public SimpleListView(final Context context)
{
this(context, null);
}
public SimpleListView(final Context context, final AttributeSet attrs)
{
this(context, attrs, android.R.attr.listViewStyle);
}
public SimpleListView(final Context context, final AttributeSet attrs, final int defStyle)
{
super(context, attrs, defStyle);
final TypedArray array =
context.obtainStyledAttributes(attrs, R.styleable.SimpleListView, defStyle, 0);
final Drawable dividerAttribute =
array.getDrawable(R.styleable.SimpleListView_android_divider);
if(dividerAttribute != null) {
setDivider(dividerAttribute);
}
final int dividerHeightAttribute =
array.getDimensionPixelSize(R.styleable.SimpleListView_android_dividerHeight, 0);
if(dividerHeightAttribute != 0) {
setDividerHeight(dividerHeightAttribute);
}
array.recycle();
}
public Drawable getDivider()
{
return this.divider;
}
public void setDivider(final Drawable newDivider)
{
if(newDivider != null) {
this.dividerHeight = newDivider.getIntrinsicHeight();
this.clipDivider = newDivider instanceof ColorDrawable;
} else {
this.dividerHeight = 0;
this.clipDivider = false;
}
this.divider = newDivider;
requestLayout();
}
public int getDividerHeight()
{
return this.dividerHeight;
}
public void setDividerHeight(final int newHeight)
{
this.dividerHeight = newHeight;
requestLayout();
}
@Override
public ListAdapter getAdapter()
{
return this.adapter;
}
@Override
public void setAdapter(final ListAdapter adapter)
{
this.adapter = adapter;
removeAllViewsInLayout();
requestLayout();
}
@Override
public View getSelectedView()
{
throw new UnsupportedOperationException(
"SimpleListView.getSelectedView() is not supported");
}
@Override
public void setSelection(final int position)
{
throw new UnsupportedOperationException(
"SimpleListView.setSelection(int) is not supported");
}
@Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int innerWidth = 0;
int innerHeight = 0;
final int itemCount = this.adapter == null ? 0 : this.adapter.getCount();
if(itemCount > 0
&& (widthMode != MeasureSpec.EXACTLY || heightMode != MeasureSpec.EXACTLY)) {
for(int i = 0; i < itemCount; ++i) {
final View convertView = getChildAt(i);
final View child = this.adapter.getView(i, convertView, this);
if(convertView == null) {
LayoutParams params = child.getLayoutParams();
if(params == null) {
params = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
child.setLayoutParams(params);
}
addViewInLayout(child, i, params);
}
if(child.getLayoutParams() instanceof MarginLayoutParams) {
measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0);
} else {
measureChild(child, widthMeasureSpec, heightMeasureSpec);
}
innerWidth = Math.max(innerWidth, child.getMeasuredWidth());
innerHeight += child.getMeasuredHeight();
}
innerHeight += (itemCount - 1) * this.dividerHeight;
}
if(widthMode != MeasureSpec.EXACTLY) {
final int newWidthSize = getPaddingLeft() + getPaddingRight() + innerWidth;
widthSize =
widthMode == MeasureSpec.AT_MOST ? Math.min(widthSize, newWidthSize)
: newWidthSize;
}
if(heightMode != MeasureSpec.EXACTLY) {
final int newHeightSize = getPaddingTop() + getPaddingBottom() + innerHeight;
heightSize =
heightMode == MeasureSpec.AT_MOST ? Math.min(heightSize, newHeightSize)
: newHeightSize;
}
setMeasuredDimension(widthSize, heightSize);
}
@Override
protected void onLayout(final boolean changed, final int left, final int top, final int right,
final int bottom)
{
super.onLayout(changed, left, top, right, bottom);
if(this.adapter == null) {
return;
}
positionItems();
invalidate();
}
private void positionItems()
{
int top = getPaddingTop();
final int left = getPaddingLeft();
for(int i = 0, count = getChildCount(); i < count; ++i) {
final View child = getChildAt(i);
final int width = child.getMeasuredWidth();
final int height = child.getMeasuredHeight();
child.layout(left, top, left + width, top + height);
top += height + this.dividerHeight;
}
}
@Override
protected void dispatchDraw(final Canvas canvas)
{
final boolean drawDividers = this.dividerHeight > 0 && this.divider != null;
if(drawDividers) {
final int left = getPaddingLeft();
final int right = getWidth() - getPaddingRight();
final Rect dividerBounds = new Rect(left, 0, right, 0);
for(int i = 0, count = getChildCount(); i < count - 1; ++i) {
final View child = getChildAt(i);
dividerBounds.top = dividerBounds.bottom + child.getMeasuredHeight();
dividerBounds.bottom = dividerBounds.top + this.dividerHeight;
drawDivider(canvas, dividerBounds);
}
}
super.dispatchDraw(canvas);
}
private void drawDivider(final Canvas canvas, final Rect bounds)
{
if(!this.clipDivider) {
this.divider.setBounds(bounds);
} else {
canvas.save();
canvas.clipRect(bounds);
}
this.divider.draw(canvas);
if(this.clipDivider) {
canvas.restore();
}
}
}
我面临同样的问题。我发现的唯一的解决方案是将PopupWindow宽度设置到ListView的准确宽度：
listView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
final PopupWindow popup = new PopupWindow(listView, listView.getMeasuredWidth(),
ViewGroup.LayoutParams.WRAP_CONTENT, true);
popup.showAsDropDown(anchor);
不幸的是，它并没有完全解决问题。 ListView测试自己，以便它只能包装它的第一个孩子。如果例如第二个孩子比第一个孩子宽，第二个孩子将被裁剪。
我不确定，但改变ListView度量方式的唯一方法是将其子类化并覆盖onMeasure()方法。我现在想做，如果我能成功，我会在这里写评论。
这是如何做到这一点：
// Don't use this. It causes ListView's to have strange widths, similar to "fill_parent"
//popupWindow.setWindowLayoutMode(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT);
// Instead, use this:
final int NUM_OF_VISIBLE_LIST_ROWS = 4;
listView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
popupWindow.setWidth(listView.getMeasuredWidth());
popupWindow.setHeight((listView.getMeasuredHeight() + 10) * NUM_OF_VISIBLE_LIST_ROWS);
注意setWidth()和setHeight()使用原始像素值，所以你需要调整不同屏幕尺寸和不同的密度。
你可以把暂时控制在XML文件中，如：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:entries="@array/popitems" />
<TextView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:text="My name is ZhengGuangyu"
android:visibility="invisible" />
</LinearLayout>
请注意TextView的文本。你应该把你的列表视图的最长文本。
如果你的列表视图中包含下面的字符串：
，那么你应该写橙色的TextView;
然后用这个：
popupWindow.setWidth(LayoutParams.WRAP_CONTENT);
popupWindow.setHeight(LayoutParams.WRAP_CONTENT);
它的工作对我来说，你可以试试。
我的解决办法是重写的ListView这样的onMeasure：
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int maxWidth = meathureWidthByChilds() + getPaddingLeft() + getPaddingRight();
super.onMeasure(MeasureSpec.makeMeasureSpec(maxWidth, MeasureSpec.EXACTLY), heightMeasureSpec);
}
public int meathureWidthByChilds() {
int maxWidth = 0;
View view = null;
for (int i = 0; i < getAdapter().getCount(); i++) {
view = getAdapter().getView(i, view, this);
view.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
if (view.getMeasuredWidth() > maxWidth){
maxWidth = view.getMeasuredWidth();
}
}
return maxWidth;
}
感谢分享！ – shiami 2010-12-01 02:26:14
我写了一个'SimpleListView'类来扩展'AdapterView'类。它的性能很差，但可以根据其子女的宽度改变其宽度。如果你愿意，我可以分享源代码。 – Michael 2010-12-01 19:06:55
小精灵，你能分享你的答案吗 – pengwang 2010-12-02 06:45:15