Android: NullPointerException

Question

I'm getting this error while I try to view my layouts in the graphical layout in ADT. The project runs fine and there were no problems with this at first. In addition,if I start a new project and open a layout xml file in the graphical layout its loading it fine. these are the xml file codes:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="@string/tot"
    android:textSize="40sp" />

<Button
    android:id="@+id/btn_Add"
    android:layout_width="450sp"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="@string/add" />

<Button
    android:id="@+id/btn_Sub"
    android:layout_width="450sp"
    android:layout_height="wrap_content"
    android:layout_marginTop="14dp"
    android:gravity="center"
    android:text="@string/sub" />

</LinearLayout>

Logcat:

java.lang.NullPointerException
at android.graphics.Bitmap_Delegate.nativeWidth(Bitmap_Delegate.java:296)
at android.graphics.Bitmap.nativeWidth(Bitmap.java)
at android.graphics.Bitmap.getWidth(Bitmap.java:917)
at android.graphics.Bitmap.getScaledWidth(Bitmap.java:965)
at android.graphics.drawable.BitmapDrawable.computeBitmapSize(BitmapDrawable.java:183)
at android.graphics.drawable.BitmapDrawable.setBitmap(BitmapDrawable.java:191)
at android.graphics.drawable.BitmapDrawable.<init>(BitmapDrawable.java:604)
at android.graphics.drawable.BitmapDrawable.<init>(BitmapDrawable.java:114)
at com.android.layoutlib.bridge.impl.ResourceHelper.getDrawable(ResourceHelper.java:239)
at com.android.layoutlib.bridge.bars.CustomBar.loadIcon(CustomBar.java:212)
at com.android.layoutlib.bridge.bars.CustomBar.loadIconById(CustomBar.java:204)
at com.android.layoutlib.bridge.bars.CustomBar.loadIconById(CustomBar.java:171)
at com.android.layoutlib.bridge.bars.FakeActionBar.<init>(FakeActionBar.java:38)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:347)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:336)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:333)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:451)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1545)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1302)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:1059)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.delegatePageChange(LayoutEditorDelegate.java:686)
at com.android.ide.eclipse.adt.internal.editors.common.CommonXmlEditor.pageChange(CommonXmlEditor.java:360)
at org.eclipse.ui.part.MultiPageEditorPart$2.widgetSelected(MultiPageEditorPart.java:292)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
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.Widget.sendEvent(Widget.java:1077)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3028)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1749)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:278)
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:4169)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1053)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:942)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
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:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
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:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)

What happens if you clean the project?

andy256
– andy256

2013-09-28 20:55:21 +00:00
Commented Sep 28, 2013 at 20:55 — andy256
– andy256, Commented Sep 28, 2013 at 20:55
Shouldn't the button layout_width be in dp?

Prince
– Prince

2015-05-12 14:17:02 +00:00
Commented May 12, 2015 at 14:17 — Prince
– Prince, Commented May 12, 2015 at 14:17

Adnan · Accepted Answer · 2013-09-28 21:01:00Z

1

You are right. I do face these types of errors soon. Following fix works for me.

1)In xml mode. Select all code, copy it.

2)Create new layout file. Paste code.

3) Delete old file. Rename new file to previous file name.

Have fun.

answered Sep 28, 2013 at 21:01

Adnan

5,0855 gold badges29 silver badges45 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Community · Accepted Answer · 2017-05-23 11:51:17Z

0

You cannot get an error while just trying to view your layout in a Graphical Layout. These errors are probably the previous the run-time errors you got when u ran your project or may be some other projects.

Clean your logs, by "clear-log" button available in the Logcat console and you will be fine.

Edit 1:

So this is not your Logcat errors (run-time errors). This is your compile-time errors.

I noticed that you have given hard-coded width to your button. This is probably not a right approach. Give it "wrap_content". Also u should never give width & height's to views in "sp". Always use 'dp' if you have to. 'sp' is normally meant for "text" font size. You might wanna check out this SO link for more clarification on sp, dp.

edited May 23, 2017 at 11:51

CommunityBot

11 silver badge

answered Sep 28, 2013 at 20:56

epiphany27

5171 gold badge10 silver badges23 bronze badges

1 Comment

Zachinio Over a year ago

I have tried this many times..when I try to open the graphic layout this shown:java.lang.NullPointerException Exception details are logged in Window > Show View > Error Log

Undo · Accepted Answer · 2014-03-30 23:55:51Z

0

If you are still having this problem, right click on the layout file and elect to open with XML Editor, as opposed to the Android Common XML Editor.

edited Mar 30, 2014 at 23:55

Undo♦

25.7k38 gold badges114 silver badges132 bronze badges

answered Mar 30, 2014 at 23:50

OTGuest

1

Comments

cutiko · Accepted Answer · 2015-06-26 14:43:56Z

0

Found the problem with this, my xml file was under a subfolder inside drawable, Im using Android Studio. This is what I initially did:

Secondary click in drawable
New File
New file was assign to xxhdpi sub-folder
Eventually select xml file

This is the re-do (fix):

Secondary click in drawbable folder
New/Drawable Resource
New Resource is added directly to drawable folder

Please let me know if I helped you.

edited Jun 26, 2015 at 14:43

answered Jan 19, 2015 at 17:18

cutiko

10.7k3 gold badges52 silver badges70 bronze badges

Collectives™ on Stack Overflow

Android: NullPointerException

4 Answers 4

Comments

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related