diff --git a/app/src/main/ic_launcher-web.png b/app/src/main/ic_launcher-web.png
new file mode 100644
index 0000000..eca030f
Binary files /dev/null and b/app/src/main/ic_launcher-web.png differ
diff --git a/app/src/main/java/io/github/jeffshee/visualizerdemo/MainActivity.kt b/app/src/main/java/io/github/jeffshee/visualizerdemo/MainActivity.kt
index db781b2..ec402a8 100644
--- a/app/src/main/java/io/github/jeffshee/visualizerdemo/MainActivity.kt
+++ b/app/src/main/java/io/github/jeffshee/visualizerdemo/MainActivity.kt
@@ -11,12 +11,13 @@ import android.support.v4.app.ActivityCompat
 import android.support.v4.content.ContextCompat
 import android.support.v7.app.AppCompatActivity
 import android.view.View
-import io.github.jeffshee.visualizer.painters.fft.FftCircle
-import io.github.jeffshee.visualizer.painters.fft.FftWave
-import io.github.jeffshee.visualizer.painters.misc.Background
+import android.widget.Toast
+import io.github.jeffshee.visualizer.painters.fft.*
 import io.github.jeffshee.visualizer.painters.misc.SimpleIcon
+import io.github.jeffshee.visualizer.painters.modifier.Beat
+import io.github.jeffshee.visualizer.painters.modifier.Move
+import io.github.jeffshee.visualizer.painters.modifier.Rotate
 import io.github.jeffshee.visualizer.painters.modifier.Shake
-import io.github.jeffshee.visualizer.painters.modifier.Zoom
 import io.github.jeffshee.visualizer.painters.waveform.Waveform
 import io.github.jeffshee.visualizer.utils.Preset
 import io.github.jeffshee.visualizer.utils.VisualizerHelper
@@ -28,6 +29,7 @@ class MainActivity : AppCompatActivity() {
     private lateinit var background: Bitmap
     private lateinit var bitmap: Bitmap
     private lateinit var circleBitmap: Bitmap
+    private var current = 0
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -72,13 +74,33 @@ class MainActivity : AppCompatActivity() {
         circleBitmap = SimpleIcon.getCircledBitmap(bitmap)
 
         helper = VisualizerHelper(0)
-        visual.setPainterList(
-            helper, listOf(
+        val painterLists = listOf(
+            listOf(FftBar(), Move(FftWave(), yR = .5f)),
+            listOf(FftLine(), Move(FftWaveRgb(), yR = .5f)),
+            listOf(Rotate(SimpleIcon(circleBitmap).apply { radiusR = .5f }).apply { rpm = 2f }),
+            listOf(Preset.getPresetWithBitmap("cIcon", circleBitmap)),
+            listOf(Beat(Preset.getPresetWithBitmap("cIcon", circleBitmap))),
+            listOf(
+                Waveform().apply { paint.alpha = 150 },
+                Shake(Preset.getPresetWithBitmap("cWaveRgbIcon", circleBitmap)).apply {
+                    animX.duration = 1000
+                    animY.duration = 2000
+                }),
+            listOf(
                 Preset.getPresetWithBitmap("liveBg", background),
-
                 FftCircle().apply { paint.strokeWidth = 8f;paint.strokeCap = Paint.Cap.ROUND }
             )
         )
+        visual.setPainterList(
+            helper, painterLists[current]
+        )
+        visual.setOnLongClickListener {
+            if (current < painterLists.lastIndex) current++ else current = 0
+            visual.setPainterList(helper, painterLists[current])
+            true
+        }
+
+        Toast.makeText(this, "Try long-click \ud83d\ude09", Toast.LENGTH_LONG).show()
     }
 
     override fun onDestroy() {
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
index 898f3ed..0d01c2a 100644
Binary files a/app/src/main/res/mipmap-hdpi/ic_launcher.png and b/app/src/main/res/mipmap-hdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
index 64ba76f..cf64194 100644
Binary files a/app/src/main/res/mipmap-mdpi/ic_launcher.png and b/app/src/main/res/mipmap-mdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
index e5ed465..5f8d840 100644
Binary files a/app/src/main/res/mipmap-xhdpi/ic_launcher.png and b/app/src/main/res/mipmap-xhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
index b0907ca..68188e9 100644
Binary files a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png and b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
index 2c18de9..925eceb 100644
Binary files a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png and b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png differ
diff --git a/visualizer/src/main/java/io/github/jeffshee/visualizer/views/VisualizerView.kt b/visualizer/src/main/java/io/github/jeffshee/visualizer/views/VisualizerView.kt
index b23cde9..6bbe36a 100644
--- a/visualizer/src/main/java/io/github/jeffshee/visualizer/views/VisualizerView.kt
+++ b/visualizer/src/main/java/io/github/jeffshee/visualizer/views/VisualizerView.kt
@@ -54,15 +54,17 @@ class VisualizerView : View {
 
     override fun onDraw(canvas: Canvas?) {
         super.onDraw(canvas)
-        setLayerType(LAYER_TYPE_HARDWARE, paint)
-        canvas?.apply {
-            painterList.forEach {
-                it.calc(helper)
-                it.draw(canvas, helper) }
-            simpleText.text = "FPS: ${frameManager.fps()}"
-            if (fps) simpleText.draw(canvas, helper)
+        if(this::painterList.isInitialized && this::helper.isInitialized){
+            setLayerType(LAYER_TYPE_HARDWARE, paint)
+            canvas?.apply {
+                painterList.forEach {
+                    it.calc(helper)
+                    it.draw(canvas, helper) }
+                simpleText.text = "FPS: ${frameManager.fps()}"
+                if (fps) simpleText.draw(canvas, helper)
+            }
+            frameManager.tick()
+            if (anim) invalidate()
         }
-        frameManager.tick()
-        if (anim) invalidate()
     }
 }
\ No newline at end of file