diff --git a/app/build.gradle b/app/build.gradle
index b15dbad..32bb92b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -15,6 +15,8 @@ android {
         versionName "1.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+
+        vectorDrawables.useSupportLibrary = true
     }
 
     buildTypes {
diff --git a/app/src/main/java/cc/jerryxiao/easterscrsaver/COLREmojiCompat.kt b/app/src/main/java/cc/jerryxiao/easterscrsaver/COLREmojiCompat.kt
index 1c8aeb4..2b1c252 100644
--- a/app/src/main/java/cc/jerryxiao/easterscrsaver/COLREmojiCompat.kt
+++ b/app/src/main/java/cc/jerryxiao/easterscrsaver/COLREmojiCompat.kt
@@ -2,7 +2,6 @@
 
 package cc.jerryxiao.easterscrsaver
 
-import android.app.Activity
 import android.content.Context
 import android.graphics.Canvas
 import android.graphics.drawable.Drawable
@@ -57,13 +56,13 @@ fun releaseIdentifiedCOLREmoji() {
     cachedDrawable.clear()
 }
 
-fun Array<Bubble>.identifierCOLREmoji(activity: Activity) {
+fun Array<Bubble>.identifierCOLREmoji(context: Context) {
     val list = ArrayList<CharSequence>()
     for (bubble in this) {
-        val drawable = activity.identifierEmojiDrawable(bubble.text, list)
+        val drawable = context.identifierEmojiDrawable(bubble.text, list)
         if (drawable != null) {
             bubble.drawable = drawable
             bubble.text = null
         }
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java b/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java
index a04d47b..cd8a742 100644
--- a/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java
+++ b/app/src/main/java/cc/jerryxiao/easterscrsaver/EasterDream.java
@@ -35,18 +35,15 @@ public class EasterDream extends DreamService {
     private static String TAG = "easter_daydream";
     private Drawable wallPaperDrawable = null;
     private FrameLayout last = null;
+    private boolean enabled = false;
     public void refresh() {
         final ImageView mLogo;
         final BubblesDrawable mBg;
         final FrameLayout layout = new FrameLayout(this);
 
-        Point size = new Point();
-        getWindowManager().getDefaultDisplay().getRealSize(size);
-
         final DisplayMetrics dm = getResources().getDisplayMetrics();
         final float dp = dm.density;
-        //final int minSide = Math.min(dm.widthPixels, dm.heightPixels);
-        final int minSide = Math.min(size.x, size.y);
+        final int minSide = Math.min(dm.widthPixels, dm.heightPixels);
         final int widgetSize = (int) (minSide * 0.75);
 
         final FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(widgetSize, widgetSize);
@@ -77,7 +74,7 @@ public class EasterDream extends DreamService {
         else {
             layout.setAlpha(0f);
             layout.setVisibility(View.VISIBLE);
-            addContentView(layout, new ViewGroup.LayoutParams(size.x, size.y));
+            addContentView(layout, new ViewGroup.LayoutParams(last.getWidth(), last.getHeight()));
             int animDuration = getResources().getInteger(android.R.integer.config_longAnimTime);
             animDuration = Math.max(animDuration, 1500);
             layout.animate().alpha(1f).setDuration(animDuration).setListener(null);
@@ -96,6 +93,11 @@ public class EasterDream extends DreamService {
         last = layout;
     }
 
+    @Override
+    public void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        enabled = false;
+    }
     @Override
     public void onAttachedToWindow() {
         super.onAttachedToWindow();
@@ -106,6 +108,8 @@ public class EasterDream extends DreamService {
         setFullscreen(true);
         // Set the dream layout
 
+        enabled = true;
+
         WallpaperManager wallPaperManager = WallpaperManager.getInstance(this);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && wallPaperManager.isWallpaperSupported()) {
             if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
@@ -229,13 +233,14 @@ class BubblesDrawable extends Drawable {
             drawn++;
         }
 
-        timer.schedule(new TimerTask() {
+        if (timer != null) timer.schedule(new TimerTask() {
             @Override
             public void run() {
                 timer.cancel();
                 timer.purge();
+                timer = null;
                 new Handler(Looper.getMainLooper()).post(() -> {
-                    context.refresh();
+                    if (context.enabled) try { context.refresh(); } catch (Exception ignored) {}
                 });
                 //randomize();
                 //chooseEmojiSet();
@@ -263,7 +268,7 @@ class BubblesDrawable extends Drawable {
         }
         // support code
         if (!supportCOLR) {
-            COLREmojiCompat.identifierCOLREmoji(mBubbs, null);
+            COLREmojiCompat.identifierCOLREmoji(mBubbs, this.context);
         }
         invalidateSelf();
     }