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POExtended EditText class wont instantiate
 

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  1. POExtended EditText class wont instantiate
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    <p>I'm trying to extend the EditText class but I can't seem to get it to work. I've created this class in my public class MainActivity extends Activity as a sub class:</p> <pre><code>public class EditText2 extends EditText { public EditText2(Context context) { super(context); // TODO Auto-generated constructor stub } public EditText2(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub } public EditText2(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub } } </code></pre> <p>and tried hand coding and using the Graphical Layout tab in Eclipse to edit the activity_main.xml to add the new class as such:</p> <pre><code>&lt;first.words.firstwords.MainActivity.EditText2 android:id="@+id/user_input" android:layout_width="wrap_content" android:layout_height="wrap_content" android:ems="10" android:text="EditText2" &gt; &lt;requestFocus /&gt; &lt;/first.words.firstwords.MainActivity.EditText2&gt; </code></pre> <p>But I get:</p> <blockquote> <p>java.lang.NullPointerException at com.android.layoutlib.bridge.impl.RenderSessionImpl.getDefaultProperties(RenderSessionImpl.java:1476) at com.android.layoutlib.bridge.BridgeRenderSession.getDefaultProperties(BridgeRenderSession.java:68) at com.android.ide.eclipse.adt.internal.editors.layout.gle2.ViewHierarchy.getDefaultProperties(ViewHierarchy.java:710) at com.android.ide.eclipse.adt.internal.editors.layout.properties.XmlProperty.getStringValue(XmlProperty.java:209) at com.android.ide.eclipse.adt.internal.editors.layout.properties.XmlProperty.getValue(XmlProperty.java:221) at com.android.ide.eclipse.adt.internal.editors.layout.properties.XmlPropertyEditor.getText(XmlPropertyEditor.java:116) at com.android.ide.eclipse.adt.internal.editors.layout.properties.XmlPropertyEditor.paint(XmlPropertyEditor.java:131) at org.eclipse.wb.internal.core.model.property.table.PropertyTable.drawProperty(PropertyTable.java:1309) at org.eclipse.wb.internal.core.model.property.table.PropertyTable.drawContent(PropertyTable.java:1151) at org.eclipse.wb.internal.core.model.property.table.PropertyTable.handlePaint(PropertyTable.java:1094) at org.eclipse.wb.internal.core.model.property.table.PropertyTable.access$200(PropertyTable.java:64) at org.eclipse.wb.internal.core.model.property.table.PropertyTable$3.handleEvent(PropertyTable.java:187) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1276) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1300) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1285) at org.eclipse.swt.widgets.Control.gtk_expose_event(Control.java:2992) at org.eclipse.swt.widgets.Composite.gtk_expose_event(Composite.java:709) at org.eclipse.swt.widgets.Canvas.gtk_expose_event(Canvas.java:167) at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1769) at org.eclipse.swt.widgets.Control.windowProc(Control.java:5116) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4377) at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method) at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:8317) at org.eclipse.swt.widgets.Display.eventProc(Display.java:1193) at org.eclipse.swt.internal.gtk.OS._gdk_window_process_all_updates(Native Method) at org.eclipse.swt.internal.gtk.OS.gdk_window_process_all_updates(OS.java:5571) at org.eclipse.swt.widgets.Display.update(Display.java:4330) at org.eclipse.swt.widgets.Display.runDeferredLayouts(Display.java:3588) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3173) 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(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) 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) at org.eclipse.equinox.launcher.Main.main(Main.java:1414)</p> </blockquote> <p>from the activity_main.xml and ClassNotFoundException when I run the application. I've googled around and looked at <a href="https://stackoverflow.com/questions/7648924/extending-a-edittext-in-android-what-do-i-do-wrong">Extending a EditText in Android. What do I do wrong?</a> and <a href="https://stackoverflow.com/questions/7518573/whats-the-right-way-to-extend-edittext-to-give-it-additional-default-function">What's the right way to extend EditText to give it additional “default” functionality</a> among others to no avail.</p> <p>Can anyone see where I've gone wrong as I've spent hours looking myself and can't see it.</p>
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