Android布局编辑器在预览自定义视图时引发异常

Android布局编辑器无法实例化自定义视图，这使我无法在布局编辑器中看到正确的预览。这在我的构造函数中：

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PinCodeView);
    try {
        int n = a.length();
        for (int i = 0; i < n; i++) {
            int attr = a.getIndex(i);

            switch (attr) {
            case R.styleable.PinCodeView_pinLength:
                pinLength = a.getInt(attr, 0);
                break;
            /* more case statements */
            }
        }
    } finally {
        a.recycle();
    }

下面是来自Eclipse的堆栈跟踪：

java.lang.ArrayIndexOutOfBoundsException: 2
at android.content.res.TypedArray.getIndex(TypedArray.java:71)
at com.example.pincode.PinCodeView.<init>(PinCodeView.java:52)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(ProjectCallback.java:402)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:166)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:135)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:739)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:711)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:372)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:321)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:324)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:325)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:372)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1361)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1115)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:941)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.partActivated(LayoutEditorDelegate.java:477)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.partBroughtToTop(LayoutEditorDelegate.java:487)
at org.eclipse.ui.internal.PartListenerList$2.run(PartListenerList.java:87)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.PartListenerList.fireEvent(PartListenerList.java:57)
at org.eclipse.ui.internal.PartListenerList.firePartBroughtToTop(PartListenerList.java:85)
at org.eclipse.ui.internal.PartService.firePartBroughtToTop(PartService.java:208)
at org.eclipse.ui.internal.WorkbenchPagePartList.firePartBroughtToTop(WorkbenchPagePartList.java:76)
at org.eclipse.ui.internal.WorkbenchPagePartList.fireActiveEditorChanged(WorkbenchPagePartList.java:52)
at org.eclipse.ui.internal.PartList.setActiveEditor(PartList.java:162)
at org.eclipse.ui.internal.WorkbenchPage.makeActiveEditor(WorkbenchPage.java:1281)
at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3530)
at org.eclipse.ui.internal.WorkbenchPage.requestActivation(WorkbenchPage.java:3077)
at org.eclipse.ui.internal.PartPane.requestActivation(PartPane.java:279)
at org.eclipse.ui.internal.EditorPane.requestActivation(EditorPane.java:98)
at org.eclipse.ui.internal.PartPane.setFocus(PartPane.java:325)
at org.eclipse.ui.internal.EditorPane.setFocus(EditorPane.java:127)
at org.eclipse.ui.internal.PartStack.presentationSelectionChanged(PartStack.java:844)
at org.eclipse.ui.internal.PartStack.access$1(PartStack.java:827)
at org.eclipse.ui.internal.PartStack$1.selectPart(PartStack.java:137)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:133)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:278)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent(DefaultTabFolder.java:88)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2743)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1429)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:257)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3629)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3284)
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(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)

java.lang.ArrayIndexOutofBounds异常：2
位于android.content.res.TypedArray.getIndex（TypedArray.java:71）
位于com.example.pincode.PinCodeView。（PinCodeView.java:52）
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）
位于sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:39）
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:27）
位于java.lang.reflect.Constructor.newInstance（Constructor.java:513）
位于com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.InstanceClass（ProjectCallback.java:402）
位于com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView（ProjectCallback.java:166）
在android.view.BridgeInflater.loadCustomView（BridgeInflater.java:207）中
在android.view.BridgeInflater.createViewFromTag（BridgeInflater.java:135）中
位于android.view.LayoutInflater.rInflate_Original（LayoutInflater.java:739）
在android.view.LayoutInflater\u Delegate.rInflate（LayoutInflater\u Delegate.java:64）
位于android.view.LayoutInflater.rInflate（LayoutInflater.java:711）
在android.view.LayoutInflater.充气（LayoutInflater.java:489）
在android.view.LayoutInflater.inflate（LayoutInflater.java:372）
在com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate（RenderSessionImpl.java:321）上
位于com.android.layoutlib.bridge.bridge.createSession（bridge.java:324）
位于com.android.ide.common.rendering.layoutbrary.createSession（layoutbrary.java:325）
位于com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession（RenderService.java:372）
位于com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge（GraphicalEditorPart.java:1361）
位于com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout（GraphicalEditorPart.java:1115）
在com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated上（GraphicalEditorPart.java:941）
位于com.android.ide.eclipse.adt.internal.editors.layout.layouteditorregate.partActivated（layouteditorregate.java:477）
位于com.android.ide.eclipse.adt.internal.editors.layout.layouteditorregate.partBroughtToTop（layouteditorregate.java:487）
位于org.eclipse.ui.internal.PartListenerList$2.run（PartListenerList.java:87）
位于org.eclipse.core.runtime.SafeRunner.run（SafeRunner.java:42）
位于org.eclipse.core.runtime.Platform.run（Platform.java:888）
位于org.eclipse.ui.internal.PartListenerList.fireEvent（PartListenerList.java:57）
位于org.eclipse.ui.internal.PartListenerList.firePartBroughtToTop（PartListenerList.java:85）
位于org.eclipse.ui.internal.PartService.firePartBroughtToTop（PartService.java:208）
在org.eclipse.ui.internal.WorkbenchPagePartList.firePartBroughtToTop（WorkbenchPagePartList.java:76）上
位于org.eclipse.ui.internal.WorkbenchPagePartList.fireActiveEditorChanged（WorkbenchPagePartList.java:52）
位于org.eclipse.ui.internal.PartList.setActiveEditor（PartList.java:162）
位于org.eclipse.ui.internal.WorkbenchPage.makeActiveEditor（WorkbenchPage.java:1281）
位于org.eclipse.ui.internal.WorkbenchPage.setActivePart（WorkbenchPage.java:3530）
位于org.eclipse.ui.internal.WorkbenchPage.requestActivation（WorkbenchPage.java:3077）
位于org.eclipse.ui.internal.PartPane.requestActivation（PartPane.java:279）
位于org.eclipse.ui.internal.EditorPane.requestActivation（EditorPane.java:98）
位于org.eclipse.ui.internal.PartPane.setFocus（PartPane.java:325）
位于org.eclipse.ui.internal.EditorPane.setFocus（EditorPane.java:127）
在org.eclipse.ui.internal.PartStack.presentationSelectionChanged上（PartStack.java:844）
访问org.eclipse.ui.internal.PartStack.access$1（PartStack.java:827）
位于org.eclipse.ui.internal.PartStack$1.selectPart（PartStack.java:137）
位于org.eclipse.ui.internal.presentations.util.tabbesttackpresentation$1.handleEvent（tabbesttackpresentation.java:133）
位于org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent（AbstractTabFolder.java:269）
位于org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent（AbstractTabFolder.java:278）
位于org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1（DefaultTabFolder.java:1）
位于org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent（DefaultTabFolder.java:88）
位于org.eclipse.swt.widgets.EventTable.sendEvent（EventTable.java:84）
位于org.eclipse.swt.widgets.Display.sendEvent（Display.java:3783）
位于org.eclipse.swt.widgets.Widget.sendEvent（Widget.java:1375）
位于org.eclipse.swt.widgets.Widget.sendEvent（Widget.java:1398）
位于org.eclipse.swt.widgets.Widget.sendEvent（Widget.java:1383）
位于org.eclipse.swt.widgets.Widget.notifyListeners（Widget.java:1195）
位于org.eclipse.swt.custom.CTabFolder.setSelection（CTabFolder.java:2743）
位于org.eclipse.swt.custom.CTabFolder.onMouse（CTabFolder.java:1429）
位于org.eclipse.swt.custom.CTabFolder$1.handleEvent（CTabFolder.java:257）
位于org.eclipse.swt.widgets.EventTable.sendEvent（EventTable.java:84）
位于org.eclipse.swt.widgets.Display.sendEvent（Display.java:3783）
位于org.eclipse.swt.widgets.Widget.sendEvent（Widget.java:1375）
位于org.eclipse.swt.widgets.Widget.sendEvent（Widget.java:1398）
位于org.eclipse.swt.widgets.Widget.sendEvent（Widget.java:1383）
位于org.eclipse.swt.widgets.Widget.notifyListeners（Widget.java:1195）
位于org.eclipse.swt.widgets.Display.runDeferredEvents（Display.java:3629）
在org.eclipse.swt.widgets.Display.readAndDispatch（Display.java:3284）上
位于org.eclipse.ui.internal.Workbench.runEventLoop（Workbench.java:2640）
位于org.eclipse.ui.internal.Workbench.runUI（Workbench.java:2604）
位于org.eclipse.ui.internal.Workbench.access$4（Workbench.java:2438）
位于org.eclipse.ui.internal.Workbench$7.run（Workbench.java:671）
位于org.eclipse.core.databinding.observable.Realm.runWithDefault（Realm.java:332）
在或
java.lang.ArrayIndexOutOfBoundsException: 2
at android.content.res.TypedArray.getIndex(TypedArray.java:71)
at com.example.pincode.PinCodeView.<init>(PinCodeView.java:52)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(ProjectCallback.java:402)
at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:166)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:135)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:739)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:711)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:372)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:321)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:324)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:325)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:372)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1361)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1115)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:941)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.partActivated(LayoutEditorDelegate.java:477)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.partBroughtToTop(LayoutEditorDelegate.java:487)
at org.eclipse.ui.internal.PartListenerList$2.run(PartListenerList.java:87)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.PartListenerList.fireEvent(PartListenerList.java:57)
at org.eclipse.ui.internal.PartListenerList.firePartBroughtToTop(PartListenerList.java:85)
at org.eclipse.ui.internal.PartService.firePartBroughtToTop(PartService.java:208)
at org.eclipse.ui.internal.WorkbenchPagePartList.firePartBroughtToTop(WorkbenchPagePartList.java:76)
at org.eclipse.ui.internal.WorkbenchPagePartList.fireActiveEditorChanged(WorkbenchPagePartList.java:52)
at org.eclipse.ui.internal.PartList.setActiveEditor(PartList.java:162)
at org.eclipse.ui.internal.WorkbenchPage.makeActiveEditor(WorkbenchPage.java:1281)
at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3530)
at org.eclipse.ui.internal.WorkbenchPage.requestActivation(WorkbenchPage.java:3077)
at org.eclipse.ui.internal.PartPane.requestActivation(PartPane.java:279)
at org.eclipse.ui.internal.EditorPane.requestActivation(EditorPane.java:98)
at org.eclipse.ui.internal.PartPane.setFocus(PartPane.java:325)
at org.eclipse.ui.internal.EditorPane.setFocus(EditorPane.java:127)
at org.eclipse.ui.internal.PartStack.presentationSelectionChanged(PartStack.java:844)
at org.eclipse.ui.internal.PartStack.access$1(PartStack.java:827)
at org.eclipse.ui.internal.PartStack$1.selectPart(PartStack.java:137)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:133)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:278)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent(DefaultTabFolder.java:88)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2743)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1429)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:257)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3783)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1375)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1398)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1383)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1195)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3629)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3284)
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(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PinCodeView);  
int n = a.getIndexCount();  
for(int i =0;i < n;i++){ 
    int attr = a.getIndex(i);   
    switch(attr){  
      case R.styleable.PinCodeView_pinLength:  
         String strtext=a.getString(R.styleable.PinCodeView_pinLength);  
      break;  

      default:  
      break;  
    }              
}  
a.recycle();