새로 정의한 레이아웃에서 문제가 발생합니다.

컴파일은 문제 없이 돌아가는데

xml 미리 보기에서

soundpool이나 mediaplayer 초기화 부분에서

에러가 생겨서 화면이 보이지 않습니다.

에뮬레이터에서는 돌아가지만

단말기에서는 설치조차 되지 않더군요

이게 잘 되다가 갑자기 어느 때부터

문제가 발생하더니 원인이 대체 무엇인지 모르겠습니다.

java.lang.NoClassDefFoundError: Could not initialize class android.media.SoundPool
    at com.fin10.AndPiano.Drum.init(Drum.java:78)
    at com.fin10.AndPiano.Drum.<init>(Drum.java:64)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(Unknown Source)
    at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(Unknown Source)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:198)
    at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:126)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:296)
    at com.android.layoutlib.bridge.Bridge.computeLayout(Bridge.java:396)
    at com.android.ide.eclipse.adt.internal.editors.layout.gle1.GraphicalLayoutEditor.computeLayout(Unknown Source)
    at com.android.ide.eclipse.adt.internal.editors.layout.gle1.GraphicalLayoutEditor.recomputeLayout(Unknown Source)
    at com.android.ide.eclipse.adt.internal.editors.layout.gle1.GraphicalLayoutEditor.onConfigurationChange(Unknown Source)
    at com.android.ide.eclipse.adt.internal.editors.layout.configuration.ConfigurationComposite.onDeviceConfigChange(Unknown Source)
    at com.android.ide.eclipse.adt.internal.editors.layout.configuration.ConfigurationComposite.access$2(Unknown Source)
    at com.android.ide.eclipse.adt.internal.editors.layout.configuration.ConfigurationComposite$3.widgetSelected(Unknown Source)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3910)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3503)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1311)