Android : java.lang.RuntimeException: Could not initialize AdView: AdView was initialized with a Context that wasn't an Activity

I have implemented admob in my activity. it is working fine . i want to use it in customized dialog box. But it give the run time exception.i.e

09-19 15:55:19.519: E/AndroidRuntime(7050): android.view.InflateException: Binary XML file line #7: Error inflating class <unknown> 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.createView(LayoutInflater.java:626) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:702) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.rInflate(LayoutInflater.java:761) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.parseInclude(LayoutInflater.java:855) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.rInflate(LayoutInflater.java:751) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.inflate(LayoutInflater.java:498) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.inflate(LayoutInflater.java:398) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.inflate(LayoutInflater.java:354) 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:350) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.app.Dialog.setContentView(Dialog.java:480) 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.burble.JoinLoadActivity.addjumper(JoinLoadActivity.java:663) 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.burble.JoinLoadActivity.onClick(JoinLoadActivity.java:342) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.View.performClick(View.java:4658) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.View$PerformClick.run(View.java:19461) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.os.Handler.handleCallback(Handler.java:733) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.os.Handler.dispatchMessage(Handler.java:95) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.os.Looper.loop(Looper.java:146) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.app.ActivityThread.main(ActivityThread.java:5653) 09-19 15:55:19.519: E/AndroidRuntime(7050): at java.lang.reflect.Method.invokeNative(Native Method) 09-19 15:55:19.519: E/AndroidRuntime(7050): at java.lang.reflect.Method.invoke(Method.java:515) 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291) 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107) 09-19 15:55:19.519: E/AndroidRuntime(7050): at dalvik.system.NativeStart.main(Native Method) 09-19 15:55:19.519: E/AndroidRuntime(7050): Caused by: java.lang.reflect.InvocationTargetException 09-19 15:55:19.519: E/AndroidRuntime(7050): at java.lang.reflect.Constructor.constructNative(Native Method) 09-19 15:55:19.519: E/AndroidRuntime(7050): at java.lang.reflect.Constructor.newInstance(Constructor.java:423) 09-19 15:55:19.519: E/AndroidRuntime(7050): at android.view.LayoutInflater.createView(LayoutInflater.java:600) 09-19 15:55:19.519: E/AndroidRuntime(7050): ... 22 more 09-19 15:55:19.519: E/AndroidRuntime(7050): Caused by: java.lang.RuntimeException: Could not initialize AdView: AdView was initialized with a Context that wasn't an Activity. 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.google.ads.AdView.a(SourceFile:402) 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.google.ads.AdView.<init>(SourceFile:125) 09-19 15:55:19.519: E/AndroidRuntime(7050): ... 25 more 09-19 15:55:19.519: E/AndroidRuntime(7050): Caused by: com.google.ads.internal.b: AdView was initialized with a Context that wasn't an Activity. 09-19 15:55:19.519: E/AndroidRuntime(7050): at com.google.ads.AdView.a(SourceFile:389) 09-19 15:55:19.519: E/AndroidRuntime(7050): ... 26 more

can anyone help me on this. Thanks in advance!