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demo a horizontal and vertical recycler view (#758)
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‎demoProjects/ExamplesComposeConstraintLayout/.idea/deploymentTargetDropDown.xml‎

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‎demoProjects/ExamplesRecyclerView/app/src/main/AndroidManifest.xml‎

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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<activity android:name="com.example.motionrecycle.TwoRecycler"
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android:exported="true">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<activity android:name="com.example.motionrecycle.BinaryLights"
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android:exported="true">
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<intent-filter>

‎demoProjects/ExamplesRecyclerView/app/src/main/java/com/example/motionrecycle/TwoRecycler.java‎

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package com.example.motionrecycle;
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import android.os.Bundle;
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import android.os.Handler;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.Button;
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import androidx.annotation.NonNull;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.constraintlayout.motion.widget.MotionLayout;
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import androidx.constraintlayout.motion.widget.TransitionAdapter;
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import androidx.constraintlayout.utils.widget.MotionLabel;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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public class TwoRecycler extends AppCompatActivity {
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MotionLayout motionLayout;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.recycler_two);
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setTitle("Collapsing Horizontal & Vertical RecyclerView");
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motionLayout = findViewById(R.id.motion_layout_container);
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RecyclerView recyclerView = findViewById(R.id.recycler_view_vertical);
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configure(recyclerView, false);
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recyclerView = findViewById(R.id.recycler_view_horizontal_view);
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configure(recyclerView, true);
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}
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public void configure(RecyclerView rv, boolean horizontal) {
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rv.setAdapter( new RecyclerView.Adapter<SimpleViewHolder>() {
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final int type = (horizontal) ? R.layout.row_item_horizontal : R.layout.lock_recycler_item;
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@NonNull
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@Override
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public SimpleViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
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LayoutInflater inflater = LayoutInflater.from(parent.getContext());
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View view = inflater.inflate(type, parent, false);
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return new SimpleViewHolder(view, rv);
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}
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@Override
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public void onBindViewHolder(@NonNull SimpleViewHolder holder, int position) {
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if (horizontal)
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((MotionLabel) (holder.label)).setText("Group " + position);
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else
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((Button) (holder.label)).setText("item " + position);
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}
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@Override
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public int getItemCount() {
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return 200;
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}
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});
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rv.setLayoutManager(new LinearLayoutManager(this,
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(horizontal) ? RecyclerView.HORIZONTAL : RecyclerView.VERTICAL, false));
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}
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static class SimpleViewHolder extends RecyclerView.ViewHolder {
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View label;
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RecyclerView mRecyclerView;
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TransitionAdapter adapter = new TransitionAdapter() {
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@Override
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public void onTransitionStarted(MotionLayout motionLayout, int startId, int endId) {
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mRecyclerView.suppressLayout(true);
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}
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@Override
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public void onTransitionCompleted(MotionLayout motionLayout, int currentId) {
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mRecyclerView.suppressLayout(false);
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}
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};
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public SimpleViewHolder(View itemView, RecyclerView recyclerView) {
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super(itemView);
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mRecyclerView = recyclerView;
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label = itemView.findViewById(R.id.button);
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if (itemView instanceof MotionLayout) {
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((MotionLayout) itemView).setTransitionListener(adapter);
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}
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}
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}
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}
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‎demoProjects/ExamplesRecyclerView/app/src/main/res/layout/recycler_two.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.motion.widget.MotionLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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xmlns:tools="http://schemas.android.com/tools"
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android:id="@+id/motion_layout_container"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:layout_marginVertical="16dp"
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app:layoutDescription="@xml/recycle_two_scene"
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tools:context=".MainActivity">
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<TextView
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android:id="@+id/horizontal_title_text_view"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:text="Horizontal RecyclerView"
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android:textAlignment="center"
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android:textSize="20sp" />
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<androidx.core.widget.NestedScrollView
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android:id="@+id/recycler_view_horizontal"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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app:layout_constraintTop_toBottomOf="@+id/horizontal_title_text_view"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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android:orientation="vertical">
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<androidx.recyclerview.widget.RecyclerView
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android:id="@+id/recycler_view_horizontal_view"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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tools:itemCount="1"
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tools:listitem="@layout/row_single_item_horizontal" />
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</androidx.core.widget.NestedScrollView>
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<TextView
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android:id="@+id/vertical_title_text_view"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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android:text="Vertical RecyclerView"
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android:textAlignment="center"
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android:textSize="20sp" />
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<androidx.recyclerview.widget.RecyclerView
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android:id="@+id/recycler_view_vertical"
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android:layout_width="0dp"
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android:layout_height="0dp"
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tools:itemCount="10"
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tools:listitem="@layout/row_single_item" />
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</androidx.constraintlayout.motion.widget.MotionLayout>

‎demoProjects/ExamplesRecyclerView/app/src/main/res/layout/row_item_horizontal.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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android:layout_width="200dp"
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android:layout_height="100dp">
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<androidx.constraintlayout.utils.widget.MotionLabel
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android:id="@+id/base"
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android:layout_width="0dp"
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android:layout_height="0dp"
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android:layout_margin="8dp"
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android:background="#125127"
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app:borderRound="4sp"
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android:text="Horizontal"
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android:textColor="#A9DFAA"
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app:textPanY="0.9"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintEnd_toEndOf="parent"
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app:layout_constraintStart_toStartOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<androidx.constraintlayout.utils.widget.MotionLabel
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android:id="@+id/button"
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android:layout_width="0dp"
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android:layout_height="0dp"
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android:layout_marginTop="32dp"
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android:layout_marginBottom="-16dp"
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android:text="Horizontal item."
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android:textColor="#EBFFEB"
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android:background="#4E5C4C"
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app:borderRound="16sp"
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app:layout_constraintBottom_toBottomOf="@+id/base"
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app:layout_constraintEnd_toEndOf="@+id/base"
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app:layout_constraintStart_toStartOf="@+id/base"
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app:layout_constraintTop_toTopOf="@+id/base" />
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</androidx.constraintlayout.widget.ConstraintLayout>

‎demoProjects/ExamplesRecyclerView/app/src/main/res/xml/recycle_two_scene.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<MotionScene
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:motion="http://schemas.android.com/apk/res-auto">
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<ConstraintSet android:id="@+id/start">
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<Constraint
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android:id="@id/horizontal_title_text_view"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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motion:layout_constraintTop_toTopOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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motion:layout_constraintEnd_toEndOf="parent"
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/>
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<Constraint
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android:id="@id/recycler_view_horizontal"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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motion:layout_constraintEnd_toEndOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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motion:layout_constraintTop_toBottomOf="@id/horizontal_title_text_view" />
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<Constraint
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android:id="@id/vertical_title_text_view"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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motion:layout_constraintEnd_toEndOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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motion:layout_constraintTop_toBottomOf="@id/recycler_view_horizontal"
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/>
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<Constraint
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android:id="@id/recycler_view_vertical"
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android:layout_width="0dp"
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android:layout_height="0dp"
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motion:layout_constraintBottom_toBottomOf="parent"
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motion:layout_constraintEnd_toEndOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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motion:layout_constraintTop_toBottomOf="@id/vertical_title_text_view" />
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</ConstraintSet>
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<ConstraintSet android:id="@+id/end">
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<Constraint
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android:id="@id/horizontal_title_text_view"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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motion:layout_constraintTop_toTopOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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motion:layout_constraintEnd_toEndOf="parent"
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android:visibility="invisible"
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/>
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<Constraint
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android:id="@id/recycler_view_horizontal"
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motion:layout_constraintBottom_toTopOf="parent"
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motion:layout_constraintEnd_toEndOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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android:visibility="invisible"
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/>
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<Constraint
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android:id="@id/vertical_title_text_view"
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android:layout_width="0dp"
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android:layout_height="wrap_content"
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motion:layout_constraintEnd_toEndOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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motion:layout_constraintTop_toTopOf="parent" />
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<Constraint
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android:id="@id/recycler_view_vertical"
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android:layout_width="0dp"
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android:layout_height="0dp"
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motion:layout_constraintBottom_toBottomOf="parent"
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motion:layout_constraintEnd_toEndOf="parent"
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motion:layout_constraintStart_toStartOf="parent"
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motion:layout_constraintTop_toBottomOf="@id/vertical_title_text_view" />
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</ConstraintSet>
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<Transition
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motion:duration="1000"
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motion:layoutDuringTransition="honorRequest"
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motion:constraintSetEnd="@+id/end"
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motion:constraintSetStart="@+id/start">
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<OnSwipe
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motion:dragScale=".25"
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motion:touchAnchorId="@id/recycler_view_vertical"
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motion:dragDirection="dragUp"
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motion:onTouchUp="stop" />
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</Transition>
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</MotionScene>

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