Can't save Android XML file with custom component

I created Android XML lay out with some custom components. But when I am saving the XML file I get error. Since this is my fist time with custom components (widgets) I have no idea why am I getting this error. This is my xml code.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:layout_marginTop="12dp"
android:orientation="vertical"
android:background="@drawable/layout_bg">

<LinearLayout
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:layout_gravity="center_horizontal"
    android:paddingLeft="12dp"
    android:paddingRight="12dp"
    android:paddingTop="30dp">

  <kankan.wheel.widget.WheelView android:id="@+id/day"
        android:layout_height="wrap_content"
        android:layout_width="46dp"/>
    <kankan.wheel.widget.WheelView android:id="@+id/month"
        android:layout_height="wrap_content"
        android:layout_width="100dp"/>
    <kankan.wheel.widget.WheelView android:id="@+id/year"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"/> 


</LinearLayout>

And this is the error I get. I must say that there is no such a resource value in R.java file

error! NotFoundException: Could not resolve resource value: 0x7F020009.

android.content.res.Resources$NotFoundException: Could not resolve resource value: 0x7F020009. at com.android.layoutlib.bridge.BridgeResources.throwException(BridgeResources.java:546) at com.android.layoutlib.bridge.BridgeResources.getDrawable(BridgeResources.java:131) at kankan.wheel.widget.WheelView.initResourcesIfNecessary(WheelView.java:427) at kankan.wheel.widget.WheelView.calculateLayoutWidth(WheelView.java:482) at kankan.wheel.widget.WheelView.onMeasure(WheelView.java:518) at android.view.View.measure(View.java:7964) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:888) at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:619) at android.widget.LinearLayout.onMeasure(LinearLayout.java:280) at android.view.View.measure(View.java:7964) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:888) at android.widget.LinearLayout.measureVertical(Linea开发者_运维知识库rLayout.java:350) at android.widget.LinearLayout.onMeasure(LinearLayout.java:278) at android.view.View.measure(View.java:7964) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3023) at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) at android.view.View.measure(View.java:7964) at com.android.layoutlib.bridge.Bridge.computeLayout(Bridge.java:443) at com.android.ide.common.rendering.LayoutLibrary.createLegacySession(LayoutLibrary.java:404) at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:285) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1506) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1312) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1043) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.onXmlModelChanged(GraphicalEditorPart.java:1005) at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.xmlModelChanged(LayoutEditor.java:303) at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEditor$XmlModelStateListener.modelChanged(AndroidXmlEditor.java:1213) at org.eclipse.wst.sse.core.internal.model.AbstractStructuredModel.fireModelChanged(AbstractStructuredModel.java:553) at org.eclipse.wst.sse.core.internal.model.AbstractStructuredModel.internalModelChanged(AbstractStructuredModel.java:887) at org.eclipse.wst.sse.core.internal.model.AbstractStructuredModel.changedModel(AbstractStructuredModel.java:382) at org.eclipse.wst.xml.core.internal.document.DOMModelImpl.changedModel(DOMModelImpl.java:167) at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEditor.wrapEditXmlModel(AndroidXmlEditor.java:803) at com.android.ide.eclipse.adt.internal.editors.uimodel.UiElementNode.setPropertyValue(UiElementNode.java:1885) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.CanvasViewInfo.setPropertyValue(CanvasViewInfo.java:320) at org.eclipse.ui.views.properties.PropertySheetEntry.valueChanged(PropertySheetEntry.java:782) at org.eclipse.ui.views.properties.PropertySheetEntry.setValue(PropertySheetEntry.java:723) at org.eclipse.ui.views.properties.PropertySheetEntry.applyEditorValue(PropertySheetEntry.java:146) at org.eclipse.ui.views.properties.PropertySheetEntry$1.applyEditorValue(PropertySheetEntry.java:103) at org.eclipse.jface.viewers.CellEditor$1.run(CellEditor.java:333) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.CellEditor.fireApplyEditorValue(CellEditor.java:331) at com.android.ide.eclipse.adt.internal.editors.ui.EditableDialogCellEditor.handleDefaultSelection(EditableDialogCellEditor.java:264) at com.android.ide.eclipse.adt.internal.editors.ui.EditableDialogCellEditor$1.widgetDefaultSelected(EditableDialogCellEditor.java:83) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:119) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) 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:369) 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:619) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) at org.eclipse.equinox.launcher.Main.run(Main.java:1407) at org.eclipse.equinox.launcher.Main.main(Main.java:1383)

Please help me to resolve this error. Thanks in advance.

To solve this problem all I had to do is remove the following import:

import kankan.wheel.R; // remove this line

which gets added automatically when you copy and paste the code from the sample demo

Remove the line highlighted in this screen grab

There is a resource that is not found. It could be e.g. the @drawable/layout_bg you're using?

If that's not it, take a look at these two lines:

initResourcesIfNecessary(WheelView.java:427) 
calculateLayoutWidth(WheelView.java:482) 

You're calling something there that is requesting a Resource that is not there (an Id, a drawable, etc etc).

Every thing is correct. Please check the image format for layout_bg in drawable folder. Supported formats:

1.jpg 2.png 3.bmp

(eg: Android accept .jpg, not .jpeg).

I solved this by "try-catching" the resources access in the method

     initResourcesIfNecessary

I understand that it is not the ideal solution, but at least now i can edit my layouts in design time.

The modified method is below

        private void initResourcesIfNecessary() {


    if (centerDrawable == null) {
        try {
            centerDrawable = getContext().getResources().getDrawable(R.drawable.wheel_val);
        } catch (Exception ex) {
            centerDrawable = null;
        }
    }

    if (topShadow == null) {
        try {
            topShadow = new GradientDrawable(Orientation.TOP_BOTTOM, SHADOWS_COLORS);
        } catch (Exception ex) {
            topShadow = null;
        }
    }

    if (bottomShadow == null) {
        try {
            bottomShadow = new GradientDrawable(Orientation.BOTTOM_TOP, SHADOWS_COLORS);
        } catch (Exception ex) {
            bottomShadow = null;
        }
    }
    try {
        setBackgroundResource(R.drawable.wheel_bg);
    } catch (Exception ex) {
        setBackgroundResource(0);
    }
}