How do I scroll like this programmatically?
For that scrolling behavior you need collapse or expand CollapsingToolbarLayout no need to scroll your the NestedScrollView
Here is the sample code for that
How do I scroll like this programmatically?
For that scrolling behavior you need collapse or expand CollapsingToolbarLayout no need to scroll your the NestedScrollView
Here is the sample code for that
Try this Make some below changes in your Layout
<?xml version="1.0" encoding="utf-8"?> <androidx.coordinatorlayout.widget.CoordinatorLayout 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:id="@+id/rootView" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true"> <com.google.android.material.appbar.AppBarLayout android:id="@+id/app_bar" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@android:color/transparent" android:fitsSystemWindows="true"> <com.google.android.material.appbar.CollapsingToolbarLayout android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" app:expandedTitleMarginEnd="64dp" app:expandedTitleMarginStart="48dp" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <ImageView android:id="@+id/iv_image" android:layout_width="match_parent" android:layout_height="250dp" android:adjustViewBounds="true" android:scaleType="fitXY" android:src="@drawable/goku" app:layout_collapseMode="parallax" app:layout_collapseParallaxMultiplier="0.7" /> <androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" app:contentInsetLeft="0dp" app:contentInsetStart="0dp" app:contentInsetStartWithNavigation="0dp" app:titleTextAppearance="@style/AppTheme.Toolbar.Title" app:popupTheme="@style/AppTheme.PopupOverlay" /> </com.google.android.material.appbar.CollapsingToolbarLayout> </com.google.android.material.appbar.AppBarLayout> <com.google.android.material.floatingactionbutton.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" android:background="@color/Boxcolordiabled" app:layout_anchor="@id/app_bar" app:layout_anchorGravity="bottom|end" app:srcCompat="@drawable/ic_favorite" /> <androidx.core.widget.NestedScrollView android:id="@+id/nsv_form" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/holo_blue_light" app:layout_behavior="@string/appbar_scrolling_view_behavior"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:animateLayoutChanges="true" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> <Button android:id="@+id/btnColl" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="Expand " /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="@string/demo" /> </LinearLayout> </androidx.core.widget.NestedScrollView> </androidx.coordinatorlayout.widget.CoordinatorLayout> Activity code
import android.animation.ValueAnimator; import android.os.Bundle; import android.view.View; import android.view.animation.DecelerateInterpolator; import android.widget.Button; import android.widget.Toast; import com.google.android.material.appbar.AppBarLayout; import com.google.android.material.floatingactionbutton.FloatingActionButton; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import androidx.appcompat.widget.Toolbar; import androidx.coordinatorlayout.widget.CoordinatorLayout; import neel.com.bottomappbar.R; public class MainActivity extends AppCompatActivity { Toolbar toolbar; AppBarLayout app_bar; Button btnColl; FloatingActionButton fab; CoordinatorLayout rootView; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); toolbar = findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setTitle("Stack Demo"); app_bar = findViewById(R.id.app_bar); btnColl = findViewById(R.id.btnColl); fab = findViewById(R.id.fab); rootView = findViewById(R.id.rootView); fab.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(MainActivity.this, "Collapse FAB Clicked", Toast.LENGTH_SHORT).show(); CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) app_bar.getLayoutParams(); final AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior(); if (behavior != null) { ValueAnimator valueAnimator = ValueAnimator.ofInt(); valueAnimator.setInterpolator(new DecelerateInterpolator()); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { behavior.setTopAndBottomOffset((Integer) animation.getAnimatedValue()); app_bar.requestLayout(); } }); valueAnimator.setIntValues(0, -900); valueAnimator.setDuration(1000); valueAnimator.start(); } } }); btnColl.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(MainActivity.this, "Expand btnColl Clicked", Toast.LENGTH_SHORT).show(); CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) app_bar.getLayoutParams(); final AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior(); if (behavior != null) { ValueAnimator valueAnimator = ValueAnimator.ofInt(); valueAnimator.setInterpolator(new DecelerateInterpolator()); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { behavior.setTopAndBottomOffset((Integer) animation.getAnimatedValue()); app_bar.requestLayout(); } }); valueAnimator.setIntValues(-900, 0); valueAnimator.setDuration(400); valueAnimator.start(); } } }); } } OUTPUT
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