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I've created a custom layout to show gif animated image. Here is the code: 

public class GIFView extends View{ private Movie movie; private InputStream is; private long moviestart; private long duration; public GIFView(Context context) { super(context); is=getResources().openRawResource(R.drawable.anim_cerca); movie=Movie.decodeStream(is); duration = movie.duration(); } public GIFView(Context context,AttributeSet set){ super(context,set); is=getResources().openRawResource(R.drawable.anim_cerca); movie=Movie.decodeStream(is); duration = movie.duration(); } public GIFView(Context context,AttributeSet set,int def){ super(context,set,def); is=getResources().openRawResource(R.drawable.anim_cerca); movie=Movie.decodeStream(is); duration = movie.duration(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); long now=android.os.SystemClock.uptimeMillis(); Paint p = new Paint(); p.setAntiAlias(true); if (moviestart == 0) moviestart = now; int relTime = (int)((now - moviestart) % duration); movie.setTime(relTime); movie.draw(canvas,0,0); this.invalidate(); } }

This is the xml where i put this object: 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/sfondo"> <LinearLayout android:id="@+id/linearLayout2" android:layout_height="wrap_content" android:layout_width="match_parent" android:orientation="vertical"> <LinearLayout android:id="@+id/linearLayout1" android:layout_height="fill_parent" android:weightSum="1" android:layout_width="fill_parent" android:orientation="horizontal"> <ImageView android:layout_height="73dp" android:id="@+id/imageView1" android:layout_weight="0.25" android:src="@drawable/trovachiavi" android:layout_width="256dip"></ImageView> <ImageButton android:id="@+id/infoButton" android:background="@null" android:layout_height="47dp" android:layout_marginLeft="10dip" android:layout_weight="0.25" android:layout_marginTop="15dip" android:src="@drawable/info_mini" android:layout_width="47dp"></ImageButton> </LinearLayout> </LinearLayout> <LinearLayout android:id="@+id/layoutGIF" android:layout_height="wrap_content" android:layout_width="wrap_content" android:orientation="vertical"> <com.digit.GIFView android:id="@+id/gIFView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center"></com.digit.GIFView> </LinearLayout> <ImageButton android:id="@+id/avvia_cerca" android:layout_height="wrap_content" android:layout_width="wrap_content" android:layout_marginTop="10dp" android:layout_gravity="center|bottom" android:background="@null"></ImageButton> </LinearLayout>

When i go in the Graphical Layout zone of xml, it appears an error:

The following classes could not be instantiated: - (Open Class, Show Error Log) See the Error Log (Window > Show View) for more details. Tip: Use View.isInEditMode() in your custom views to skip code when shown in Eclipse

and in Error log appears these:

java.lang.NullPointerException at com.digit.GIFView.<init>(GIFView.java:27) 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:396) at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:164) at com.android.layoutlib.bridge.android.BridgeInflater.loadCustomView(BridgeInflater.java:205) at com.android.layoutlib.bridge.android.BridgeInflater.createViewFromTag(BridgeInflater.java:133) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:83) at android.view.LayoutInflater.rInflate(LayoutInflater.java:702) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:86) at android.view.LayoutInflater.rInflate(LayoutInflater.java:702) at android.view.LayoutInflater.inflate(LayoutInflater.java:479) at android.view.LayoutInflater.inflate(LayoutInflater.java:367) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:324) at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:321) 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:380) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1310) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1075) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:901) at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partActivated(LayoutEditor.java:416) at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.partBroughtToTop(LayoutEditor.java:425) 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)

What can i do? where does the error born? The elements under my custom view aren't displayed!

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5 Answers 5

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3

You have a NullPointerException in one of your constructors. I can not exactly tell which one, as the StackTrace says line 27, which is an empty line in the code you posted.

You should re-run your code, check the first line of the stack trace in your code. I would guess it's this line: 

duration = movie.duration();

and the movie object is null.

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8 Comments

if movie is null, I guess "is" is also null, which is because "R.drawable.anim_cerca" cannot be opened as raw resource, as it is compressed in your apk. Try storing your gif either in "assets" or "raw".
and how can i get it to create is?
as I said: store your gif in the "assets" folder of your android project and access the gif using 'context.getAssets().open("your-file-name-here.gif");' which also returns an input stream
the problem still remain... does eclipse compile, every time i open xml, all the .java associated with xml?
to be sure: do a "clean project" on your android project ;). Always a good thing to do, if you changed your resources and something strange happens.
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2

The problem is not with your code but displaying custom view in Graphical Layout. Drawing views rely on device features. To see your custom view properly you have to use the isInEditMode() method in your custom view implementation. Based on that method, you have to implement alternative initialization and drawing.

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1

I think you want your xml file object to be like this:

<com.spazio.digitale.GIFView android:id="@+id/gIFView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" />

assuming that your package is com.spazio.digitale which I'm not totally sure of from what you've posted.

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3 Comments

yes, true, i made error when i write post, but in eclipse is all ok
I suggest you update your post, it's hard to read the code when its not accurate.
looking at your log file, you need to look at the code is at line 27 as in com.digit.GIFView.<init>(GIFView.java:27) since that is where the exception is happening. I can't tell which line that is from what you've posted.
0

Try this it work for me 

public class MyOwnTextView extends TextView { public MyOwnTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub } public MyOwnTextView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub } public MyOwnTextView(Context context) { super(context); // TODO Auto-generated constructor stub } public void setTypeface(Typeface tf, int style) { if(!this.isInEditMode()){ Typeface normalTypeface = Typeface.createFromAsset(getContext().getAssets(), "font/Roboto-Light.ttf"); Typeface boldTypeface = Typeface.createFromAsset(getContext().getAssets(), "font/Roboto-Light.ttf"); if (style == Typeface.BOLD) { super.setTypeface(boldTypeface/*, -1*/); } else { super.setTypeface(normalTypeface/*, -1*/); } } } }

then at the xml 

<com.xxxxx.appname.MyOwnTextView android:layout_width="fill_parent" android:layout_height="fill_parent" />
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0

My problem was that a ttf font was placed in custom "fonts" folder under assets folder. Error when displayed xml layout:

The following classes could not be instantiated: ---- Tip: Use View.isInEditMode() in your custom views to skip code when shown...

Then, I placed the font under root assets folder, rebuilt project and, magically, all works and the xml layout was showed ok.

Then, I dragged the font to the "fonts" folder again trough ide, rebuilt project and the xml layout remains showed ok.

I don´t have any idea why this operation worked but if it can help anyone, ok.

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