Adding custom component in xml error

I'm trying to create simple custom component that draws Bitmap. It works fine when I'm adding it programatically.

RelativeLayout layout = (RelativeLayout) findViewById(R.id.linlay); Bitmap mBitmap = BitmapFactory.decodeResource(getResources(),
               R.drawable.girl);

AdView ad = new AdView(this,mBitmap);

layout.addView(ad);

But when I try to add it through xml file I get error:

<test.com.ad.AdView
   android:id="@+id/ad"
   android:layout_width="fill_parent" 
   android:layout_height="wrap_content" 
   ></test.com.ad.AdView>

java.lang.NullPointerException at test.com.ad.AdView.onMeasure(AdView.java:81) at android.view.View.measure(View.java:10577) at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581) at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365) at android.view.View.measure(View.java:10577) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4270) at android.widget.FrameLayout.onMeasure(FrameLayout.java:267) at android.view.View.measure(View.java:10577) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4270) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1284) at android.widget.LinearLayout.measureVertical(LinearLayout.java:613) at android.widget.LinearLayout.onMeasure(LinearLayout.java:519) at android.view.View.measure(View.java:10577) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4270) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1284) at android.widget.LinearLayout.measureVertical(LinearLayout.java:613) at android.widget.LinearLayout.onMeasure(LinearLayout.java:519) at android.view.View.measure(View.java:10577) at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:551) at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:453) at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:323) 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.pageChange(LayoutEditor.java:403) at org.eclipse.ui.part.MultiPageEditorPart$2.widgetSelected(MultiPageEditorPart.java:290) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4125) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270) at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2745) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1432) 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:4125) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3971) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3610) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.开发者_如何学JAVAIDEApplication.start(IDEApplication.java:123) 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:344) 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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

My onMeasure looks like that:

@Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // TODO Auto-generated method stub
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        setMeasuredDimension(resolveSize(bitmap.getWidth(), widthMeasureSpec),
                resolveSize(bitmap.getHeight(), heightMeasureSpec));

    }

What is wrong here ?

When you call new AdView(this,mBitmap); at coding then you passing mBitmap but when you try to add it through xml then mBitmap is null becuase you didnt pass mBitmap.. so you must change your AdView(this) instead of AdView(this,mBitmap); and add Bitmap mBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.girl); in AdView() class