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Support ViewGroup as sticky #4

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4f0b7a2
Support ViewGroup as sticky.
Jul 13, 2017
b48f1bf
Add sample for ViewGroup sticky.
Jul 13, 2017
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19 changes: 19 additions & 0 deletions app/src/main/java/com/github/nitrico/mystickyscrollview/MainActivity.java
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package com.github.nitrico.mystickyscrollview;

import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
Expand Down Expand Up @@ -32,6 +33,8 @@ protected void onCreate(Bundle savedInstanceState) {
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

initTabLayout();

RecyclerView recycler = (RecyclerView) findViewById(R.id.recycler);
recycler.setNestedScrollingEnabled(false);
recycler.setLayoutManager(new LinearLayoutManager(this));
Expand All @@ -43,6 +46,22 @@ protected void onCreate(Bundle savedInstanceState) {
sticky.addOnStickyScrollViewListener(this);
}

private void initTabLayout() {
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_header);

TabLayout.Tab tab = tabLayout.newTab();
tab.setText("First");
tabLayout.addTab(tab);

tab = tabLayout.newTab();
tab.setText("Second");
tabLayout.addTab(tab);

tab = tabLayout.newTab();
tab.setText("Third");
tabLayout.addTab(tab);
}

@Override
public void onScrollChanged(int x, int y, int oldX, int oldY) {

Expand Down
49 changes: 45 additions & 4 deletions app/src/main/res/layout/activity_main.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
android:layout_height="match_parent"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:layout_scrollFlags="scroll|snap|exitUntilCollapsed"
app:title="@string/app_name">

<android.support.v7.widget.Toolbar
Expand All @@ -36,11 +36,52 @@
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity">

<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:listitem="@layout/item_text"/>
android:orientation="vertical">

<android.support.design.widget.TabLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/tab_header"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="#FFFFFF"
android:tag="sticky"
app:tabBackground="?selectableItemBackground"
app:tabGravity="fill"
app:tabIndicatorColor="#FF5555"
app:tabIndicatorHeight="2dp"
app:tabMode="fixed"
app:tabSelectedTextColor="#000000"
app:tabTextColor="#000000"/>

<TextView
android:text="@string/app_name"
android:layout_width="wrap_content"
android:layout_height="?actionBarSize"/>

<TextView
android:text="@string/app_name"
android:layout_width="wrap_content"
android:layout_height="?actionBarSize"/>

<TextView
android:text="@string/app_name"
android:layout_width="wrap_content"
android:layout_height="?actionBarSize"/>

<TextView
android:text="@string/app_name"
android:layout_width="wrap_content"
android:layout_height="?actionBarSize"/>

<android.support.v7.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:listitem="@layout/item_text"/>
</LinearLayout>

</com.github.nitrico.stickyscrollview.StickyScrollView>

Expand Down
29 changes: 14 additions & 15 deletions stickyscrollview/src/main/java/com/github/nitrico/stickyscrollview/StickyScrollView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;

@Keep
Expand Down Expand Up @@ -300,7 +301,7 @@ private void doTheStickyThing() {
if (viewTop <= 0) {
if (viewThatShouldStick == null || viewTop >
(getTopForViewRelativeOnlyChild(viewThatShouldStick)
- getScrollY() + (clippingToPadding ? 0 : getPaddingTop()))) {
- getScrollY() + (clippingToPadding ? 0 : getPaddingTop()))) {
viewThatShouldStick = v;
}
} else {
Expand Down Expand Up @@ -365,22 +366,20 @@ private void notifyHierarchyChanged() {
}

private void findStickyViews(View v) {
if (v instanceof ViewGroup) {
if (!detainStickyView(v) && (v instanceof ViewGroup)) {
ViewGroup vg = (ViewGroup) v;
for (int i = 0; i < vg.getChildCount(); i++) {
String tag = getStringTagForView(vg.getChildAt(i));
if (tag != null && tag.contains(STICKY_TAG)) {
stickyViews.add(vg.getChildAt(i));
} else if (vg.getChildAt(i) instanceof ViewGroup) {
findStickyViews(vg.getChildAt(i));
}
}
} else {
String tag = (String) v.getTag();
if (tag != null && tag.contains(STICKY_TAG)) {
stickyViews.add(v);
}
for (int i = 0; i < vg.getChildCount(); i++)
findStickyViews(vg.getChildAt(i));
}
}

private boolean detainStickyView(View view) {
String tag = getStringTagForView(view);
if (tag.contains(STICKY_TAG)) {
stickyViews.add(view);
return true;
}
return false;
}

private String getStringTagForView(View v) {
Expand Down