我有一个android布局，其中有一个带有许多元素的scrollView。在scrollView的底部，我有一个listView，然后由适配器填充。
我遇到的问题是，android是排除listView从scrollView作为scrollView已经有一个可滚动的功能。我希望listView和内容一样长，并且主滚动视图是可滚动的。
我怎样才能实现这种行为呢?
这是我的主要布局:
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:fillViewport="true"
android:gravity="top" >
<LinearLayout
android:id="@+id/foodItemActvity_linearLayout_fragments"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
</LinearLayout>
</ScrollView>
然后，我以编程方式将我的组件添加到linearlayour的id: foodItemActvity_linearLayout_fragments。下面是加载到线性布局中的一个视图。就是这个给我的卷轴带来了麻烦。
<?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="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/fragment_dds_review_textView_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Reviews:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ListView
android:id="@+id/fragment_dds_review_listView"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
我的适配器然后填充这个列表视图。
当我点击主scrollView时，这是一个来自android层级查看器的图像:
如您所见，它排除了评论列表视图。
我应该能够向下滚动页面，看到8个评论，但它只显示了这3个，我可以滚动评论所在的一小部分。我想要一个全局页面滚动
在xml:
<com.example.util.NestedListView
android:layout_marginTop="10dp"
android:id="@+id/listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:divider="@null"
android:layout_below="@+id/rl_delivery_type" >
</com.example.util.NestedListView>
在Java中:
public class NestedListView extends ListView implements View.OnTouchListener, AbsListView.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;
}
}
我知道已经很长时间了，但我也有这个问题，尝试了这个解决方案，它是有效的。所以我想这对其他人也有帮助。
我添加android:fillViewport="true"的布局xml为scrollView。
总的来说，ScrollView是这样的。
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrollView6"
android:fillViewport="true">
这对我来说就像魔法一样。
位于ScrollView内部的ListView再次扩展到它的大小。
下面是ScrollView和ListView的完整示例代码。
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrollView6" android:fillViewport="true">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
....
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/lv_transList" android:layout_gravity="top"
android:layout_marginTop="5dp"/>
....
</LinearLayout>
</ScrollView>
It is not possible to use Scroll-view inside List-view as List-view already has scrolling property.
To use list-view inside Scroll-view you can follow these steps which worked for me :
1) Create NonScrollListView java file that disable the default scrolling property of list-view. and code is below
package your-package-structure;
import android.content.Context;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.ListView;
public class NonScrollListView extends ListView {
public NonScrollListView(Context context) {
super(context);
}
public NonScrollListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public NonScrollListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int heightMeasureSpec_custom = MeasureSpec.makeMeasureSpec(
Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec_custom);
ViewGroup.LayoutParams params = getLayoutParams();
params.height = getMeasuredHeight();
}
}
2) Now create xml file which which has NestedScrollView and inside this use NonScrollListView for listing your items. This will make your entire screen to scroll with all the views.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<ViewFlipper
android:id="@+id/v_flipper"
android:layout_width="match_parent"
android:layout_height="130dp">
</ViewFlipper>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SHOP"
android:textSize="15dp"
android:textStyle="bold"
android:gravity="center"
android:padding="5dp"
android:layout_marginTop="15dp"
android:layout_marginBottom="5dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginBottom="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:background="#ddd"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1"
>
<com.abc.xyz.NonScrollListView
android:id="@+id/listview"
android:divider="@null"
android:layout_width="match_parent"
android:layout_marginBottom="10dp"
android:layout_height="match_parent"
android:padding="8dp">
</com.abc.xyz.NonScrollListView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="bottom">
<include layout="@layout/footer" />
</LinearLayout>
</LinearLayout>
3) Now in java class i.e, home.java define NonScrollListView instead of Listview.
package comabc.xyz.landscapeapp;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.Toolbar;
import android.widget.ViewFlipper;
public class home extends Fragment {
int pos = 0;
ViewFlipper v_flipper;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_home, container, false);
return view;
}
@Override
public void onViewCreated(@NonNull final View view, @Nullable Bundle savedInstanceState) {
NonScrollListView listView = (NonScrollListView) view.findViewById(R.id.listview);
customAdapter customAdapter = new customAdapter(getActivity());
listView.setAdapter(customAdapter);
listView.setFocusable(false);
customAdapter.notifyDataSetChanged();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d("listview click", "onItemClick: ");
/* FragmentTransaction fr = getFragmentManager().beginTransaction().replace(R.id.fragment_container, new productdisplay());
fr.putExtra("Position", position);
fr.addToBackStack("tag");
fr.commit();*/
Intent intent = new Intent(getActivity(), productdisplay.class);
intent.putExtra("Position", position);
startActivity(intent);
}
});
//image slider
int images[] = {R.drawable.slide1, R.drawable.slide2, R.drawable.slide3};
v_flipper = view.findViewById(R.id.v_flipper);
for (int image : images) {
flipperImages(image);
}
}
private void flipperImages(int image) {
ImageView imageView = new ImageView(getActivity());
imageView.setBackgroundResource(image);
v_flipper.addView(imageView);
v_flipper.setFlipInterval(4000);
v_flipper.setAutoStart(true);
v_flipper.setInAnimation(getActivity(), android.R.anim.slide_in_left);
v_flipper.setOutAnimation(getActivity(), android.R.anim.slide_out_right);
}
}
Note: I used Fragments here.
好吧，这是我的答案。固定ListView高度的方法足够封闭，但并不完美。如果大多数项目都是相同的高度，那工作得很好。但如果不是，那就有大问题了。我尝试了很多次，当我输出listItem的值时。getMeasureHeight和listItem。getMeasuerWidth到日志中，我看到宽度值变化很大，这在这里是不期望的，因为同一ListView中的所有项应该具有相同的宽度。问题来了:
有些人使用度量(0,0)，这实际上使视图在两个方向上都没有边界，宽度也失控了。有些人尝试获取listView的twidth，但它返回0，没有意义。
当我进一步了解android如何渲染视图时，我意识到所有这些尝试都无法达到我搜索的答案，除非这些函数在视图渲染后运行。
这一次我使用getViewTreeObserver在ListView上，我想固定高度，然后添加ongloballayoutlistener。在这个方法中，我声明了一个新的OnGlobalLayoutListener，在这个方法中，getWidth返回ListView的实际宽度。
private void getLayoutWidth(final ListView lv, final int pad){
//final ArrayList<Integer> width = new ArrayList<Integer>();
ViewTreeObserver vto = lv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
lv.getViewTreeObserver().removeOnGlobalLayoutListener(this);
//width.add(layout.getMeasuredWidth());
int width = lv.getMeasuredWidth();
ListUtils.setDynamicHeight(lv, width, pad);
}
});
}
public static class ListUtils {
//private static final int UNBOUNDED = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
public static void setDynamicHeight(ListView mListView, int width, int pad) {
ListAdapter mListAdapter = mListView.getAdapter();
mListView.getParent();
if (mListAdapter == null) {
// when adapter is null
return;
}
int height = 0;
int desiredWidth = View.MeasureSpec.makeMeasureSpec(width - 2*pad, View.MeasureSpec.EXACTLY);
for (int i = 0; i < mListAdapter.getCount(); i++) {
View listItem = mListAdapter.getView(i, null, mListView);
listItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
//listItem.measure(UNBOUNDED, UNBOUNDED);
height += listItem.getMeasuredHeight() + 2*pad;
Log.v("ViewHeight :", mListAdapter.getClass().toString() + " " + listItem.getMeasuredHeight() + "--" + listItem.getMeasuredWidth());
}
ViewGroup.LayoutParams params = mListView.getLayoutParams();
params.height = height + (mListView.getDividerHeight() * (mListAdapter.getCount() - 1));
mListView.setLayoutParams(params);
mListView.requestLayout();
}
}
value pad，是我在ListView layout中设置的填充。
经过大量的研发后完成:
Fragment_one.xml应该是这样的:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/scrollViewParent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="400dip" >
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<View
android:id="@+id/customView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/transparent" />
</RelativeLayout>
<!-- Your other elements are here -->
</LinearLayout>
</ScrollView>
FragmentOne.java的Java类如下所示:
private ListView listView;
private View customView
onCreateView
listView = (ListView) rootView.findViewById(R.id.listView);
scrollViewParent = (ScrollView)rootView.findViewById(R.id.scrollViewParent);
customView = (View)rootView.findViewById(R.id.customView);
customView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// Disallow ScrollView to intercept touch events.
scrollViewParent.requestDisallowInterceptTouchEvent(true);
// Disable touch on transparent view
return false;
case MotionEvent.ACTION_UP:
// Allow ScrollView to intercept touch events.
scrollViewParent.requestDisallowInterceptTouchEvent(false);
return true;
case MotionEvent.ACTION_MOVE:
scrollViewParent.requestDisallowInterceptTouchEvent(true);
return false;
default:
return true;
}
}
});
