diff --git a/twidere/src/main/java/org/mariotaku/twidere/graphic/WindowBackgroundDrawable.java b/twidere/src/main/java/org/mariotaku/twidere/graphic/WindowBackgroundDrawable.java
deleted file mode 100644
index 2a63ba3a7..000000000
--- a/twidere/src/main/java/org/mariotaku/twidere/graphic/WindowBackgroundDrawable.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package org.mariotaku.twidere.graphic;
-
-import android.graphics.Canvas;
-import android.graphics.ColorFilter;
-import android.graphics.PixelFormat;
-import android.graphics.drawable.Drawable;
-import android.support.annotation.NonNull;
-
-/**
- * Created by mariotaku on 16/3/30.
- */
-public class WindowBackgroundDrawable extends Drawable {
-
-    private final int color;
-
-    public WindowBackgroundDrawable(int color) {
-        this.color = color;
-    }
-
-    @Override
-    public void draw(@NonNull Canvas canvas) {
-        canvas.drawColor(color);
-    }
-
-    @Override
-    public void setAlpha(int alpha) {
-        // No-op
-    }
-
-    @Override
-    public void setColorFilter(ColorFilter colorFilter) {
-        // No-op
-    }
-
-    @Override
-    public int getOpacity() {
-        return PixelFormat.TRANSLUCENT;
-    }
-}
diff --git a/twidere/src/main/kotlin/org/mariotaku/twidere/fragment/AccountsDashboardFragment.kt b/twidere/src/main/kotlin/org/mariotaku/twidere/fragment/AccountsDashboardFragment.kt
index ec3f6e507..34921d809 100644
--- a/twidere/src/main/kotlin/org/mariotaku/twidere/fragment/AccountsDashboardFragment.kt
+++ b/twidere/src/main/kotlin/org/mariotaku/twidere/fragment/AccountsDashboardFragment.kt
@@ -329,7 +329,7 @@ class AccountsDashboardFragment : BaseFragment(), LoaderCallbacks<AccountsInfo>,
     }
 
     internal fun updateAccountActions() {
-        val activity = activity as HomeActivity
+        val activity = activity as? HomeActivity ?: return
         val tabs = activity.tabs
         val account = accountsAdapter.selectedAccount ?: return
         var hasDmTab = false
diff --git a/twidere/src/main/kotlin/org/mariotaku/twidere/graphic/WindowBackgroundDrawable.kt b/twidere/src/main/kotlin/org/mariotaku/twidere/graphic/WindowBackgroundDrawable.kt
new file mode 100644
index 000000000..10c61e5da
--- /dev/null
+++ b/twidere/src/main/kotlin/org/mariotaku/twidere/graphic/WindowBackgroundDrawable.kt
@@ -0,0 +1,60 @@
+/*
+ *             Twidere - Twitter client for Android
+ *
+ *  Copyright (C) 2012-2017 Mariotaku Lee <mariotaku.lee@gmail.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.mariotaku.twidere.graphic
+
+import android.graphics.Canvas
+import android.graphics.ColorFilter
+import android.graphics.PixelFormat
+import android.graphics.drawable.Drawable
+
+/**
+ * Created by mariotaku on 16/3/30.
+ */
+class WindowBackgroundDrawable(private val color: Int) : Drawable() {
+
+    override fun draw(canvas: Canvas) {
+        canvas.drawColor(color)
+    }
+
+    override fun setAlpha(alpha: Int) {
+        // No-op
+    }
+
+    override fun setColorFilter(colorFilter: ColorFilter?) {
+        // No-op
+    }
+
+    override fun getOpacity(): Int {
+        return PixelFormat.TRANSLUCENT
+    }
+
+    override fun getConstantState(): Drawable.ConstantState {
+        return State(color)
+    }
+
+    class State(private val color: Int) : ConstantState() {
+
+        override fun newDrawable() = WindowBackgroundDrawable(color)
+
+        override fun getChangingConfigurations() = 0
+
+    }
+
+}
diff --git a/twidere/src/main/res/values-w480dp/fractions.xml b/twidere/src/main/res/values-w480dp/fractions.xml
new file mode 100644
index 000000000..2bb6332b9
--- /dev/null
+++ b/twidere/src/main/res/values-w480dp/fractions.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~             Twidere - Twitter client for Android
+  ~
+  ~  Copyright (C) 2012-2017 Mariotaku Lee <mariotaku.lee@gmail.com>
+  ~
+  ~  This program is free software: you can redistribute it and/or modify
+  ~  it under the terms of the GNU General Public License as published by
+  ~  the Free Software Foundation, either version 3 of the License, or
+  ~  (at your option) any later version.
+  ~
+  ~  This program is distributed in the hope that it will be useful,
+  ~  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~  GNU General Public License for more details.
+  ~
+  ~  You should have received a copy of the GNU General Public License
+  ~  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<resources>
+
+    <fraction name="aspect_ratio_profile_banner">250%p</fraction>
+
+</resources>
\ No newline at end of file
diff --git a/twidere/src/main/res/values-w600dp/fractions.xml b/twidere/src/main/res/values-w600dp/fractions.xml
new file mode 100644
index 000000000..3eefca924
--- /dev/null
+++ b/twidere/src/main/res/values-w600dp/fractions.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~             Twidere - Twitter client for Android
+  ~
+  ~  Copyright (C) 2012-2017 Mariotaku Lee <mariotaku.lee@gmail.com>
+  ~
+  ~  This program is free software: you can redistribute it and/or modify
+  ~  it under the terms of the GNU General Public License as published by
+  ~  the Free Software Foundation, either version 3 of the License, or
+  ~  (at your option) any later version.
+  ~
+  ~  This program is distributed in the hope that it will be useful,
+  ~  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~  GNU General Public License for more details.
+  ~
+  ~  You should have received a copy of the GNU General Public License
+  ~  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
+<resources>
+
+    <fraction name="aspect_ratio_profile_banner">300%p</fraction>
+
+</resources>
\ No newline at end of file
diff --git a/twidere/src/main/res/values-land/fractions.xml b/twidere/src/main/res/values-w720dp/fractions.xml
similarity index 100%
rename from twidere/src/main/res/values-land/fractions.xml
rename to twidere/src/main/res/values-w720dp/fractions.xml
diff --git a/twidere/src/main/res/values/fractions.xml b/twidere/src/main/res/values/fractions.xml
index 1a381b02c..276e41c1d 100644
--- a/twidere/src/main/res/values/fractions.xml
+++ b/twidere/src/main/res/values/fractions.xml
@@ -1,4 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~             Twidere - Twitter client for Android
+  ~
+  ~  Copyright (C) 2012-2017 Mariotaku Lee <mariotaku.lee@gmail.com>
+  ~
+  ~  This program is free software: you can redistribute it and/or modify
+  ~  it under the terms of the GNU General Public License as published by
+  ~  the Free Software Foundation, either version 3 of the License, or
+  ~  (at your option) any later version.
+  ~
+  ~  This program is distributed in the hope that it will be useful,
+  ~  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~  GNU General Public License for more details.
+  ~
+  ~  You should have received a copy of the GNU General Public License
+  ~  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <fraction name="aspect_ratio_profile_banner">200%p</fraction>