Develop Reference

Eclipse can't render Android layout

Eclipse gives the following error when I try to add "android.support.v7.widget.Toolbar"
The following classes could not be instantiated:
- android.support.v7.widget.Toolbar (Open Class, Show Error Log) See the Error
Log (Window > Show View) for more details.
Layout rendering error

The following classes could not be instantiated: - android.inputmethodservice.KeyboardView

I was trying to set a keyboard view but the following error occurred
"The following classes could not be instantiated:
- android.inputmethodservice.KeyboardView (Open Class, Show Error Log)"
I am using this version
Build: v22.6.2-1085508

Running Android Lint has encountered a... Failed. java.lang.NullPointerException

I just added Google Play Service Library to my project and when I am making a modification in one of my project files I am keep getting an error dialog from eclipse:
'Running Android Lint' has encountered a problem. Failed.
So, I enabled Error Log (Window -> Show View -> Error Log) tab and I found a warning and an error line:
Error:
Failed: com.android.ide.eclipse.adt
java.lang.NullPointerException
at com.android.tools.lint.checks.ApiDetector$ApiVisitor.checkField(ApiDetector.java:1416)
at com.android.tools.lint.checks.ApiDetector$ApiVisitor.visitSelect(ApiDetector.java:1277)
at com.android.tools.lint.client.api.JavaVisitor$DispatchVisitor.visitSelect(JavaVisitor.java:904)
at com.android.tools.lint.client.api.JavaVisitor$DelegatingJavaVisitor.visitSelect(JavaVisitor.java:1147)
at lombok.ast.Select.accept(Select.java:91)
at lombok.ast.MethodInvocation.accept(MethodInvocation.java:121)
at lombok.ast.ExpressionStatement.accept(ExpressionStatement.java:63)
at lombok.ast.Block.accept(Block.java:106)
at lombok.ast.MethodDeclaration.accept(MethodDeclaration.java:240)
at lombok.ast.NormalTypeBody.accept(NormalTypeBody.java:57)
at lombok.ast.ClassDeclaration.accept(ClassDeclaration.java:239)
at lombok.ast.CompilationUnit.accept(CompilationUnit.java:83)
at com.android.tools.lint.client.api.JavaVisitor.visitFile(JavaVisitor.java:219)
at com.android.tools.lint.client.api.LintDriver.checkIndividualJavaFiles(LintDriver.java:1624)
at com.android.tools.lint.client.api.LintDriver.runFileDetectors(LintDriver.java:993)
at com.android.tools.lint.client.api.LintDriver.checkProject(LintDriver.java:869)
at com.android.tools.lint.client.api.LintDriver.analyze(LintDriver.java:442)
at com.android.tools.lint.client.api.LintDriver.analyze(LintDriver.java:363)
at com.android.ide.eclipse.adt.internal.lint.LintJob.run(LintJob.java:163)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
and a Warning:
Fatal Error: No API database found at null
An exception stack trace is not available.
My application is working, but it is annoying to close the dialog each time I make an edit and save.

This is a workaround (not exactly the solution). In Window > Preferences > Android > Lint Error Checking, uncheck "When saving files check for errors".
EDIT:
Please use the above steps only if you don't care about linting your code. These steps are for turning off Lint checking, not correcting the reported lint errors.

I would suggest for you to check on the warnings on your project. Resolving them one by one may get rid of the startup error.

Opening error and log cat in Eclipse

This is a silly thing to fix but I can't open up my console windows in Eclipse. If I re-open Eclipse and change the file location they are there on display. However when I try the following:
window > show other > error log
Nothing gets opened.
Has anyone ever experienced this before?

if you want to show your logcat view do:
window -> show view -> other->Android -> logcat
for error log
window -> show view -> error log or window -> show view -> other->General -> error log

Android graphical layout representation error?

java.lang.NullPointerException
Exception details are logged in Window > Show View > Error Log
The following classes could not be found:
- RelativeLayout (Change to android.widget.RelativeLayout, Fix Build Path, Edit XML)