Optimize sample

Author: DylanCaiCoding

app/src/main/java/com/dylanc/loadinghelper/sample/adapter/ToolbarAdapter.java

@@ -39,8 +39,8 @@
  */
 public class ToolbarAdapter extends LoadingHelper.Adapter<ToolbarAdapter.ViewHolder> {
 
-  private String title;
-  private NavIconType type;
+  private final String title;
+  private final NavIconType type;
   private int menuId;
   private Function1<? super MenuItem, Boolean> onMenuItemClick;
 

app/src/main/java/com/dylanc/loadinghelper/sample/animation/FadeAnimation.java

@@ -1,7 +1,5 @@
 package com.dylanc.loadinghelper.sample.animation;
 
-import android.animation.Animator;
-import android.animation.AnimatorListenerAdapter;
 import android.view.View;
 
 import com.dylanc.loadinghelper.LoadingHelper;
@@ -13,20 +11,29 @@
  */
 public class FadeAnimation implements LoadingHelper.Animation {
 
+  private static final long DEFAULT_DURATION = 500;
+  private final long duration;
+
+  public FadeAnimation() {
+    this(DEFAULT_DURATION);
+  }
+
+  public FadeAnimation(long duration) {
+    this.duration = duration;
+  }
+
   @Override
   public void onStartShowAnimation(@NotNull View view, @NotNull Object viewType) {
     view.setAlpha(0);
-    view.animate().alpha(1).setDuration(500).setListener(null);
+    view.animate().alpha(1).setDuration(duration);
   }
 
   @Override
   public void onStartHideAnimation(@NotNull View view, @NotNull Object viewType) {
-    view.animate().alpha(0f).setDuration(500).setListener(new AnimatorListenerAdapter() {
-      @Override
-      public void onAnimationEnd(Animator animation) {
-        view.setAlpha(1);
-        view.setVisibility(View.GONE);
-      }
+    view.setAlpha(1);
+    view.animate().alpha(0).setDuration(duration).withEndAction(() -> {
+      view.setAlpha(1);
+      view.setVisibility(View.GONE);
     });
   }
 }

app/src/main/res/layout/layout_bottom_editor.xml

@@ -5,16 +5,22 @@
   android:orientation="vertical">
 
   <ScrollView
-    android:id="@+id/content_parent"
     android:layout_width="match_parent"
     android:layout_height="0dp"
-    android:layout_weight="1" />
+    android:layout_weight="1">
+
+    <LinearLayout
+      android:id="@+id/content_parent"
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:orientation="vertical" />
+  </ScrollView>
 
   <LinearLayout
     android:layout_width="match_parent"
     android:layout_height="48dp"
-    android:elevation="4dp"
     android:background="@android:color/white"
+    android:elevation="4dp"
     android:orientation="horizontal">
 
     <EditText