Wie kann man in Android klebrige Abschnittsheader (wie iOS) erstellen?
Meine spezifische Frage ist: Wie kann ich einen Effekt wie folgt erzielen: http://youtu.be/EJm7subFbQI
Der Bounce-Effekt ist nicht wichtig, aber ich brauche den "Sticky" -Effekt für die Header. Wo fange ich an? In was kann ich mich setzen? Ich brauche etwas, das ich auf API 8 implementieren kann.
Vielen Dank.
Für dieses Problem gibt es bereits einige Lösungen. Was Sie beschreiben, sind Abschnittsheader, die in Android als sticky Abschnittsheader bezeichnet werden.
BEARBEITEN: Ich hatte etwas Zeit, um den Code eines voll funktionsfähigen Beispiels hinzuzufügen. Die Antwort wurde entsprechend bearbeitet.
Für diejenigen, die keinen Drittanbietercode verwenden möchten (oder ihn nicht direkt verwenden können, z. B. in Xamarin), könnte dies relativ einfach von Hand erfolgen. Die Idee ist die Verwendung einer anderen ListView für den Header. Diese Listenansicht enthält nur die Kopfelemente. Es kann vom Benutzer nicht gescrollt werden (setEnabled (false)), wird jedoch vom Code aus durch den Bildlauf der Hauptliste gescrollt. Sie haben also zwei Listen - headerListview und mainListview sowie zwei entsprechende Adapter, headerAdapter und mainAdapter. headerAdapter gibt nur Abschnittsansichten zurück, während mainAdapter zwei Ansichtstypen (Abschnitt und Element) unterstützt. Sie benötigen eine Methode, die eine Position in der Hauptliste einnimmt und eine entsprechende Position in der Abschnittsliste zurückgibt.
Hauptaktivität
public class MainActivity extends AppCompatActivity {
public static final int TYPE_SECTION = 0;
public static final int TYPE_ITEM = 1;
ListView mainListView;
ListView headerListView;
MainAdapter mainAdapter;
HeaderAdapter headerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainListView = (ListView)findViewById(R.id.list);
headerListView = (ListView)findViewById(R.id.header);
mainAdapter = new MainAdapter();
headerAdapter = new HeaderAdapter();
headerListView.setEnabled(false);
headerListView.setAdapter(headerAdapter);
mainListView.setAdapter(mainAdapter);
mainListView.setOnScrollListener(new AbsListView.OnScrollListener(){
@Override
public void onScrollStateChanged(AbsListView view, int scrollState){
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
// this should return an index in the headers list, based one the index in the main list. The logic for this is highly dependent on your data.
int pos = mainAdapter.getSectionIndexForPosition(firstVisibleItem);
// this makes sure our headerListview shows the proper section (the one on the top of the mainListview)
headerListView.setSelection(pos);
// this makes sure that headerListview is scrolled exactly the same amount as the mainListview
if(mainAdapter.getItemViewType(firstVisibleItem + 1) == TYPE_SECTION){
headerListView.setSelectionFromTop(pos, mainListView.getChildAt(0).getTop());
}
}
});
}
public class MainAdapter extends BaseAdapter{
int count = 30;
@Override
public int getItemViewType(int position){
if((float)position / 10 == (int)((float)position/10)){
return TYPE_SECTION;
}else{
return TYPE_ITEM;
}
}
@Override
public int getViewTypeCount(){ return 2; }
@Override
public int getCount() { return count - 1; }
@Override
public Object getItem(int position) { return null; }
@Override
public long getItemId(int position) { return position; }
public int getSectionIndexForPosition(int position){ return position / 10; }
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = getLayoutInflater().inflate(R.layout.item, parent, false);
position++;
if(getItemViewType(position) == TYPE_SECTION){
((TextView)v.findViewById(R.id.text)).setText("SECTION "+position);
}else{
((TextView)v.findViewById(R.id.text)).setText("Item "+position);
}
return v;
}
}
public class HeaderAdapter extends BaseAdapter{
int count = 5;
@Override
public int getCount() { return count; }
@Override
public Object getItem(int position) { return null; }
@Override
public long getItemId(int position) { return position; }
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = getLayoutInflater().inflate(R.layout.item, parent, false);
((TextView)v.findViewById(R.id.text)).setText("SECTION "+position*10);
return v;
}
}
}
Hier ein paar Dinge zu beachten. Wir möchten nicht den allerersten Abschnitt in der Hauptansichtsliste anzeigen, da dies zu einem Duplikat führen würde (es wird bereits in der Kopfzeile angezeigt). Um dies zu vermeiden, in Ihrem mainAdapter.getCount ():
return actualCount - 1;
und stellen Sie sicher, dass die erste Zeile in Ihrer getView () -Methode ist
position++;
Auf diese Weise werden in Ihrer Hauptliste alle Zellen außer der ersten dargestellt.
Eine andere Sache ist, dass Sie sicherstellen möchten, dass die Höhe Ihrer headerListview der Höhe des Listenelements entspricht. In diesem Beispiel ist die Höhe festgelegt, es kann jedoch schwierig sein, wenn die Elementhöhe in dp nicht auf einen genauen Wert eingestellt ist. Bitte beziehen Sie sich auf diese Antwort, um zu erfahren, wie Sie dieses Problem lösen können: https://stackoverflow.com/a/41577017/291688
Hauptlayout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
xmlns:tools="http://schemas.Android.com/tools"
Android:id="@+id/activity_main"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:paddingBottom="@dimen/activity_vertical_margin"
Android:paddingLeft="@dimen/activity_horizontal_margin"
Android:paddingRight="@dimen/activity_horizontal_margin"
Android:paddingTop="@dimen/activity_vertical_margin">
<ListView
Android:id="@+id/header"
Android:layout_width="match_parent"
Android:layout_height="48dp"/>
<ListView
Android:id="@+id/list"
Android:layout_below="@+id/header"
Android:layout_width="match_parent"
Android:layout_height="match_parent"/>
</RelativeLayout>
Artikel-/Kopfzeile
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
Android:orientation="vertical" Android:layout_width="match_parent"
Android:layout_height="48dp">
<TextView
Android:id="@+id/text"
Android:gravity="center_vertical"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
/>
</LinearLayout>
Fügen Sie dies in Ihrer app.gradle-Datei hinzu
compile 'se.emilsjolander:StickyScrollViewItems:1.1.0'
dann sieht mein Layout, in dem ich Android:tag ="sticky" zu bestimmten Ansichten wie textview oder edittext und nicht zu LinearLayout hinzugefügt habe, so aus. Es verwendet auch Datenbindung, ignorieren Sie das.
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:Android="http://schemas.Android.com/apk/res/Android">
<data>
<variable
name="temp"
type="com.lendingkart.prakhar.lendingkartdemo.databindingmodel.BusinessDetailFragmentModel" />
<variable
name="presenter"
type="com.lendingkart.prakhar.lendingkartdemo.presenters.BusinessDetailsPresenter" />
</data>
<LinearLayout
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:orientation="vertical">
<com.lendingkart.prakhar.lendingkartdemo.customview.StickyScrollView
Android:id="@+id/sticky_scroll"
Android:layout_width="match_parent"
Android:layout_height="match_parent">
<!-- scroll view child goes here -->
<LinearLayout
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:orientation="vertical">
<Android.support.v7.widget.CardView xmlns:card_view="http://schemas.Android.com/apk/res-auto"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_gravity="center"
card_view:cardCornerRadius="5dp"
card_view:cardUseCompatPadding="true">
<LinearLayout
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:orientation="vertical">
<TextView
style="@style/group_view_text"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:background="@drawable/businessdetailtitletextviewbackground"
Android:padding="@dimen/activity_horizontal_margin"
Android:tag="sticky"
Android:text="@string/business_contact_detail" />
<Android.support.design.widget.TextInputLayout
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_margin="7dp">
<Android.support.design.widget.TextInputEditText
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:hint="@string/comapnyLabel"
Android:textSize="16sp" />
</Android.support.design.widget.TextInputLayout>
<Android.support.design.widget.TextInputLayout
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_margin="5dp">
<Android.support.design.widget.TextInputEditText
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:hint="@string/contactLabel"
Android:textSize="16sp" />
</Android.support.design.widget.TextInputLayout>
<Android.support.design.widget.TextInputLayout
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_margin="5dp">
<Android.support.design.widget.TextInputEditText
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:hint="@string/emailLabel"
Android:textSize="16sp" />
</Android.support.design.widget.TextInputLayout>
<Android.support.design.widget.TextInputLayout
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_margin="5dp">
<Android.support.design.widget.TextInputEditText
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:hint="@string/NumberOfEmployee"
Android:textSize="16sp" />
</Android.support.design.widget.TextInputLayout>
</LinearLayout>
</Android.support.v7.widget.CardView>
<Android.support.v7.widget.CardView xmlns:card_view="http://schemas.Android.com/apk/res-auto"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_gravity="center"
card_view:cardCornerRadius="5dp"
card_view:cardUseCompatPadding="true">
<TextView
style="@style/group_view_text"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:background="@drawable/businessdetailtitletextviewbackground"
Android:padding="@dimen/activity_horizontal_margin"
Android:tag="sticky"
Android:text="@string/nature_of_business" />
</Android.support.v7.widget.CardView>
<Android.support.v7.widget.CardView xmlns:card_view="http://schemas.Android.com/apk/res-auto"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_gravity="center"
card_view:cardCornerRadius="5dp"
card_view:cardUseCompatPadding="true">
<TextView
style="@style/group_view_text"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:background="@drawable/businessdetailtitletextviewbackground"
Android:padding="@dimen/activity_horizontal_margin"
Android:tag="sticky"
Android:text="@string/taxation" />
</Android.support.v7.widget.CardView>
</LinearLayout>
</com.lendingkart.prakhar.lendingkartdemo.customview.StickyScrollView>
</LinearLayout>
</layout>
die Stilgruppe für die Textansicht sieht folgendermaßen aus
<style name="group_view_text" parent="@Android:style/TextAppearance.Medium">
<item name="Android:layout_width">wrap_content</item>
<item name="Android:layout_height">wrap_content</item>
<item name="Android:textColor">@color/edit_text_color</item>
<item name="Android:textSize">16dp</item>
<item name="Android:layout_centerVertical">true</item>
<item name="Android:textStyle">bold</item>
</style>
und der Hintergrund für die Textansicht sieht folgendermaßen aus: (@ drawable/businessdetailtitletextviewbackground)
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:Android="http://schemas.Android.com/apk/res/Android">
<item>
<shape Android:shape="rectangle">
<solid Android:color="@color/edit_text_color" />
</shape>
</item>
<item Android:bottom="2dp">
<shape Android:shape="rectangle">
<solid Android:color="@color/White" />
</shape>
</item>
</layer-list>
Sie können diesen Effekt mit SuperSLiM library erreichen. Es bietet Ihnen einen LayoutManager für RecyclerView mit austauschbaren linearen, Raster- und gestaffelten Ansichten.
Eine gute Demo befindet sich in github Repository
Es ist einfach so ein Ergebnis zu bekommen
app:slm_headerDisplay="inline|sticky"
or
app:slm_headerDisplay="sticky"
Ich habe eine spezielle Klasse verwendet, um eine Listenansicht wie iPhone ..__ zu erreichen. Sie finden hier ein Beispiel mit Quellcode. https://demonuts.com/Android-recyclerview-sticky-header-like-iphone/
Diese Klasse, für die die Listenansicht aktualisiert wurde, lautet as
import Android.content.Context;
import Android.graphics.drawable.Drawable;
import Android.util.AttributeSet;
import Android.util.TypedValue;
import Android.view.Gravity;
import Android.view.View;
import Android.view.animation.AlphaAnimation;
import Android.widget.AbsListView;
import Android.widget.AdapterView;
import Android.widget.FrameLayout;
import Android.widget.ImageView;
import Android.widget.ImageView.ScaleType;
import Android.widget.ListView;
import Android.widget.RelativeLayout;
public class HeaderListView extends RelativeLayout {
// TODO: Handle listViews with fast scroll
// TODO: See if there are methods to dispatch to mListView
private static final int FADE_DELAY = 1000;
private static final int FADE_DURATION = 2000;
private InternalListView mListView;
private SectionAdapter mAdapter;
private RelativeLayout mHeader;
private View mHeaderConvertView;
private FrameLayout mScrollView;
private AbsListView.OnScrollListener mExternalOnScrollListener;
public HeaderListView(Context context) {
super(context);
init(context, null);
}
public HeaderListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
mListView = new InternalListView(getContext(), attrs);
LayoutParams listParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
listParams.addRule(ALIGN_PARENT_TOP);
mListView.setLayoutParams(listParams);
mListView.setOnScrollListener(new HeaderListViewOnScrollListener());
mListView.setVerticalScrollBarEnabled(false);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (mAdapter != null) {
mAdapter.onItemClick(parent, view, position, id);
}
}
});
addView(mListView);
mHeader = new RelativeLayout(getContext());
LayoutParams headerParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
headerParams.addRule(ALIGN_PARENT_TOP);
mHeader.setLayoutParams(headerParams);
mHeader.setGravity(Gravity.BOTTOM);
addView(mHeader);
// The list view's scroll bar can be hidden by the header, so we display our own scroll bar instead
Drawable scrollBarDrawable = getResources().getDrawable(R.drawable.scrollbar_handle_holo_light);
mScrollView = new FrameLayout(getContext());
LayoutParams scrollParams = new LayoutParams(scrollBarDrawable.getIntrinsicWidth(), LayoutParams.MATCH_PARENT);
scrollParams.addRule(ALIGN_PARENT_RIGHT);
scrollParams.rightMargin = (int) dpToPx(2);
mScrollView.setLayoutParams(scrollParams);
ImageView scrollIndicator = new ImageView(context);
scrollIndicator.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
scrollIndicator.setImageDrawable(scrollBarDrawable);
scrollIndicator.setScaleType(ScaleType.FIT_XY);
mScrollView.addView(scrollIndicator);
mScrollView.setVisibility(INVISIBLE);
addView(mScrollView);
}
public void setAdapter(SectionAdapter adapter) {
mAdapter = adapter;
mListView.setAdapter(adapter);
}
public void setOnScrollListener(AbsListView.OnScrollListener l) {
mExternalOnScrollListener = l;
}
private class HeaderListViewOnScrollListener implements AbsListView.OnScrollListener {
private int previousFirstVisibleItem = -1;
private int direction = 0;
private int actualSection = 0;
private boolean scrollingStart = false;
private boolean doneMeasuring = false;
private int lastResetSection = -1;
private int nextH;
private int prevH;
private View previous;
private View next;
private AlphaAnimation fadeOut = new AlphaAnimation(1f, 0f);
private boolean noHeaderUpToHeader = false;
private boolean didScroll = false;
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (mExternalOnScrollListener != null) {
mExternalOnScrollListener.onScrollStateChanged(view, scrollState);
}
didScroll = true;
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (mExternalOnScrollListener != null) {
mExternalOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
if (!didScroll) {
return;
}
firstVisibleItem -= mListView.getHeaderViewsCount();
if (firstVisibleItem < 0) {
mHeader.removeAllViews();
return;
}
updateScrollBar();
if (visibleItemCount > 0 && firstVisibleItem == 0 && mHeader.getChildAt(0) == null) {
addSectionHeader(0);
lastResetSection = 0;
}
int realFirstVisibleItem = getRealFirstVisibleItem(firstVisibleItem, visibleItemCount);
if (totalItemCount > 0 && previousFirstVisibleItem != realFirstVisibleItem) {
direction = realFirstVisibleItem - previousFirstVisibleItem;
actualSection = mAdapter.getSection(realFirstVisibleItem);
boolean currIsHeader = mAdapter.isSectionHeader(realFirstVisibleItem);
boolean prevHasHeader = mAdapter.hasSectionHeaderView(actualSection - 1);
boolean nextHasHeader = mAdapter.hasSectionHeaderView(actualSection + 1);
boolean currHasHeader = mAdapter.hasSectionHeaderView(actualSection);
boolean currIsLast = mAdapter.getRowInSection(realFirstVisibleItem) == mAdapter.numberOfRows(actualSection) - 1;
boolean prevHasRows = mAdapter.numberOfRows(actualSection - 1) > 0;
boolean currIsFirst = mAdapter.getRowInSection(realFirstVisibleItem) == 0;
boolean needScrolling = currIsFirst && !currHasHeader && prevHasHeader && realFirstVisibleItem != firstVisibleItem;
boolean needNoHeaderUpToHeader = currIsLast && currHasHeader && !nextHasHeader && realFirstVisibleItem == firstVisibleItem && Math.abs(mListView.getChildAt(0).getTop()) >= mListView.getChildAt(0).getHeight() / 2;
noHeaderUpToHeader = false;
if (currIsHeader && !prevHasHeader && firstVisibleItem >= 0) {
resetHeader(direction < 0 ? actualSection - 1 : actualSection);
} else if ((currIsHeader && firstVisibleItem > 0) || needScrolling) {
if (!prevHasRows) {
resetHeader(actualSection-1);
}
startScrolling();
} else if (needNoHeaderUpToHeader) {
noHeaderUpToHeader = true;
} else if (lastResetSection != actualSection) {
resetHeader(actualSection);
}
previousFirstVisibleItem = realFirstVisibleItem;
}
if (scrollingStart) {
int scrolled = realFirstVisibleItem >= firstVisibleItem ? mListView.getChildAt(realFirstVisibleItem - firstVisibleItem).getTop() : 0;
if (!doneMeasuring) {
setMeasurements(realFirstVisibleItem, firstVisibleItem);
}
int headerH = doneMeasuring ? (prevH - nextH) * direction * Math.abs(scrolled) / (direction < 0 ? nextH : prevH) + (direction > 0 ? nextH : prevH) : 0;
mHeader.scrollTo(0, -Math.min(0, scrolled - headerH));
if (doneMeasuring && headerH != mHeader.getLayoutParams().height) {
LayoutParams p = (LayoutParams) (direction < 0 ? next.getLayoutParams() : previous.getLayoutParams());
p.topMargin = headerH - p.height;
mHeader.getLayoutParams().height = headerH;
mHeader.requestLayout();
}
}
if (noHeaderUpToHeader) {
if (lastResetSection != actualSection) {
addSectionHeader(actualSection);
lastResetSection = actualSection + 1;
}
mHeader.scrollTo(0, mHeader.getLayoutParams().height - (mListView.getChildAt(0).getHeight() + mListView.getChildAt(0).getTop()));
}
}
private void startScrolling() {
scrollingStart = true;
doneMeasuring = false;
lastResetSection = -1;
}
private void resetHeader(int section) {
scrollingStart = false;
addSectionHeader(section);
mHeader.requestLayout();
lastResetSection = section;
}
private void setMeasurements(int realFirstVisibleItem, int firstVisibleItem) {
if (direction > 0) {
nextH = realFirstVisibleItem >= firstVisibleItem ? mListView.getChildAt(realFirstVisibleItem - firstVisibleItem).getMeasuredHeight() : 0;
}
previous = mHeader.getChildAt(0);
prevH = previous != null ? previous.getMeasuredHeight() : mHeader.getHeight();
if (direction < 0) {
if (lastResetSection != actualSection - 1) {
addSectionHeader(Math.max(0, actualSection - 1));
next = mHeader.getChildAt(0);
}
nextH = mHeader.getChildCount() > 0 ? mHeader.getChildAt(0).getMeasuredHeight() : 0;
mHeader.scrollTo(0, prevH);
}
doneMeasuring = previous != null && prevH > 0 && nextH > 0;
}
private void updateScrollBar() {
if (mHeader != null && mListView != null && mScrollView != null) {
int offset = mListView.computeVerticalScrollOffset();
int range = mListView.computeVerticalScrollRange();
int extent = mListView.computeVerticalScrollExtent();
mScrollView.setVisibility(extent >= range ? View.INVISIBLE : View.VISIBLE);
if (extent >= range) {
return;
}
int top = range == 0 ? mListView.getHeight() : mListView.getHeight() * offset / range;
int bottom = range == 0 ? 0 : mListView.getHeight() - mListView.getHeight() * (offset + extent) / range;
mScrollView.setPadding(0, top, 0, bottom);
fadeOut.reset();
fadeOut.setFillBefore(true);
fadeOut.setFillAfter(true);
fadeOut.setStartOffset(FADE_DELAY);
fadeOut.setDuration(FADE_DURATION);
mScrollView.clearAnimation();
mScrollView.startAnimation(fadeOut);
}
}
private void addSectionHeader(int actualSection) {
View previousHeader = mHeader.getChildAt(0);
if (previousHeader != null) {
mHeader.removeViewAt(0);
}
if (mAdapter.hasSectionHeaderView(actualSection)) {
mHeaderConvertView = mAdapter.getSectionHeaderView(actualSection, mHeaderConvertView, mHeader);
mHeaderConvertView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
mHeaderConvertView.measure(MeasureSpec.makeMeasureSpec(mHeader.getWidth(), MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
mHeader.getLayoutParams().height = mHeaderConvertView.getMeasuredHeight();
mHeaderConvertView.scrollTo(0, 0);
mHeader.scrollTo(0, 0);
mHeader.addView(mHeaderConvertView, 0);
} else {
mHeader.getLayoutParams().height = 0;
mHeader.scrollTo(0, 0);
}
mScrollView.bringToFront();
}
private int getRealFirstVisibleItem(int firstVisibleItem, int visibleItemCount) {
if (visibleItemCount == 0) {
return -1;
}
int relativeIndex = 0, totalHeight = mListView.getChildAt(0).getTop();
for (relativeIndex = 0; relativeIndex < visibleItemCount && totalHeight < mHeader.getHeight(); relativeIndex++) {
totalHeight += mListView.getChildAt(relativeIndex).getHeight();
}
int realFVI = Math.max(firstVisibleItem, firstVisibleItem + relativeIndex - 1);
return realFVI;
}
}
public ListView getListView() {
return mListView;
}
public void addHeaderView(View v) {
mListView.addHeaderView(v);
}
private float dpToPx(float dp) {
return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, getContext().getResources().getDisplayMetrics());
}
protected class InternalListView extends ListView {
public InternalListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected int computeVerticalScrollExtent() {
return super.computeVerticalScrollExtent();
}
@Override
protected int computeVerticalScrollOffset() {
return super.computeVerticalScrollOffset();
}
@Override
protected int computeVerticalScrollRange() {
return super.computeVerticalScrollRange();
}
}
}
XML-Verwendung
<?xml version="1.0" encoding="utf-8"?>
<Android.support.constraint.ConstraintLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
xmlns:app="http://schemas.Android.com/apk/res-auto"
xmlns:tools="http://schemas.Android.com/tools"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
tools:context=".MainActivity">
<com.example.parsaniahardik.listview_stickyheader_ios.HeaderListView
Android:layout_width="match_parent"
Android:layout_height="match_parent"
Android:id="@+id/lv">
</com.example.parsaniahardik.listview_stickyheader_ios.HeaderListView>