add: fab and toolbar hide when scrolling

app/src/main/java/com/stardust/scriptdroid/ui/main/MainActivity.java

@@ -83,7 +83,7 @@ public class MainActivity extends BaseActivity implements OnActivityResultDelega
     private FragmentPagerAdapterBuilder.StoredFragmentPagerAdapter mPagerAdapter;
 
     private OnActivityResultDelegate.Mediator mActivityResultMediator = new OnActivityResultDelegate.Mediator();
-    private DrawableSaver mDrawerHeaderBackgroundSaver, mAppbarBackgroundSaver;
+    private DrawableSaver mDrawerHeaderBackgroundSaver;
     private VersionGuard mVersionGuard;
 
 
@@ -178,7 +178,6 @@ public class MainActivity extends BaseActivity implements OnActivityResultDelega
                 R.string.text_drawer_close);
         drawerToggle.syncState();
         mDrawerLayout.addDrawerListener(drawerToggle);
-        mAppbarBackgroundSaver = new DrawableSaver.ImageSaver(this, "appbar_background", (ImageView) $(R.id.app_bar_bg));
     }
 
     private void setUpTabViewPager() {
@@ -192,11 +191,6 @@ public class MainActivity extends BaseActivity implements OnActivityResultDelega
         tabLayout.setupWithViewPager(mViewPager);
     }
 
-    @Click(R.id.add)
-    void showAddFilePanel() {
-        mAddBottomMenuPanel.show();
-    }
-
     @Click(R.id.create_new_file)
     void createScriptFile() {
         new ScriptOperations(this, mDrawerLayout)
@@ -271,15 +265,9 @@ public class MainActivity extends BaseActivity implements OnActivityResultDelega
         mVersionGuard.checkDeprecateAndUpdate();
     }
 
-    @Click(R.id.toolbar)
-    public void OnToolbarClick() {
-        mAppbarBackgroundSaver.select(this, mActivityResultMediator);
-    }
-
     @Subscribe
     public void onMessageEvent(MessageEvent event) {
         if (event.message.equals(MESSAGE_CLEAR_BACKGROUND_SETTINGS)) {
-            mAppbarBackgroundSaver.reset();
             mDrawerHeaderBackgroundSaver.reset();
         }
     }

app/src/main/java/com/stardust/scriptdroid/ui/main/script_list/MyScriptListFragment.java

@@ -107,11 +107,10 @@ public class MyScriptListFragment extends Fragment {
         mScriptFiles.clear();
         mDirectories.clear();
         StorageFileProvider.getDefault().getInitialDirectoryScriptFiles()
-                .subscribeOn(Schedulers.computation())
+                .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(new SimpleObserver<ScriptFile>() {
 
-
                     @Override
                     public void onNext(@io.reactivex.annotations.NonNull ScriptFile file) {
                         if (file.isFile()) {

app/src/main/java/com/stardust/widget/ScrollAwareFABBehavior.java

@@ -0,0 +1,84 @@
+package com.stardust.widget;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.TimeInterpolator;
+import android.content.Context;
+import android.support.design.widget.CoordinatorLayout;
+import android.support.design.widget.FloatingActionButton;
+import android.support.v4.view.animation.FastOutSlowInInterpolator;
+import android.util.AttributeSet;
+import android.view.View;
+
+/**
+ * Created by Stardust on 2017/8/20.
+ */
+
+public class ScrollAwareFABBehavior extends FloatingActionButton.Behavior {
+
+    private static final long DURATION = 200;
+    private static final TimeInterpolator INTERPOLATOR = new FastOutSlowInInterpolator();
+    private boolean mHidden = false;
+
+    public ScrollAwareFABBehavior(Context context, AttributeSet attrs) {
+        super();
+    }
+
+    @Override
+    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View directTargetChild, View target, int nestedScrollAxes) {
+        return true;
+    }
+
+    @Override
+    public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
+        super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
+        if (dyConsumed > 0) {
+            onScrollDown(coordinatorLayout, child);
+        } else if (dyConsumed < 0) {
+            onScrollUp(coordinatorLayout, child);
+        }
+    }
+
+    private void onScrollUp(CoordinatorLayout parent, FloatingActionButton button) {
+        if (!mHidden) {
+            return;
+        }
+        startShowingAnimation(parent, button);
+    }
+
+    private void startShowingAnimation(CoordinatorLayout parent, FloatingActionButton button) {
+        button.animate()
+                .translationY(0)
+                .setDuration(DURATION)
+                .setListener(new AnimatorListenerAdapter() {
+                    @Override
+                    public void onAnimationEnd(Animator animation) {
+                        mHidden = false;
+                    }
+                })
+                .start();
+    }
+
+    private void onScrollDown(CoordinatorLayout parent, FloatingActionButton button) {
+        if (mHidden) {
+            return;
+        }
+        startHidingAnimation(parent, button);
+    }
+
+    private void startHidingAnimation(CoordinatorLayout parent, FloatingActionButton button) {
+        button.animate()
+                .translationY(parent.getY() + parent.getHeight() - button.getY())
+                .setDuration(DURATION)
+                .setInterpolator(INTERPOLATOR)
+                .setListener(new AnimatorListenerAdapter() {
+                    @Override
+                    public void onAnimationEnd(Animator animation) {
+                        mHidden = true;
+                    }
+                })
+                .start();
+    }
+
+
+}