android webview CustomView onHideCustomView nullpointerexception -

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hi i'm making android web view app have error.

how can fix error??

please me.

webview mywebview; private mywebchromeclient mwebchromeclient = null; private view mcustomview; private relativelayout mcontentview; private framelayout mcustomviewcontainer; private webchromeclient.customviewcallback mcustomviewcallback; framelayout.layoutparams layoutparameters = new framelayout.layoutparams(framelayout.layoutparams.match_parent,         framelayout.layoutparams.match_parent);

...

private class mywebchromeclient extends webchromeclient {  public void onhidecustomview() {         if (mcustomview == null) {             return;         } else {             getwindow().setflags(windowmanager.layoutparams.flag_force_not_fullscreen,windowmanager.layoutparams.flag_force_not_fullscreen);             // hide custom view.             mcustomview.setvisibility(view.gone);             // remove custom view container.             mcustomviewcontainer.removeview(mcustomview);             mcustomview = null;             mcustomviewcontainer.setvisibility(view.gone);             mcustomviewcallback.oncustomviewhidden();             // show content view.             mcontentview.setvisibility(view.visible);             super.onhidecustomview();         }     } }  public boolean onkeydown(int key, keyevent event) {     if ((mcustomviewcontainer != null)&&(key == keyevent.keycode_back)) {         mwebchromeclient.onhidecustomview();         return true;     }     else if((key == keyevent.keycode_back)&&mywebview.cangoback()){         mywebview.goback();         return true;     }     return super.onkeydown(key, event); }

log cat

11-12 19:30:56.175  20071-20085/com.bayabro.bayabro v/mediaplayer﹕ callback application 11-12 19:30:56.175  20071-20085/com.bayabro.bayabro v/mediaplayer﹕ callback 11-12 19:30:56.670  20071-20071/com.bayabro.bayabro d/androidruntime﹕ shutting down vm 11-12 19:30:56.670  20071-20071/com.bayabro.bayabro w/dalvikvm﹕ threadid=1: thread exiting uncaught exception (group=0x416992a0) 11-12 19:30:56.670  20071-20071/com.bayabro.bayabro e/androidruntime﹕ fatal exception: main     java.lang.nullpointerexception             @ com.bayabro.bayabro.myactivity.onkeydown(myactivity.java:169)             @ android.view.keyevent.dispatch(keyevent.java:2705)             @ android.app.activity.dispatchkeyevent(activity.java:2431)             @ com.android.internal.policy.impl.phonewindow$decorview.dispatchkeyevent(phonewindow.java:2028)             @ android.view.viewrootimpl.deliverkeyeventpostime(viewrootimpl.java:3852)             @ android.view.viewrootimpl.handleimefinishedevent(viewrootimpl.java:3800)             @ android.view.viewrootimpl$viewroothandler.handlemessage(viewrootimpl.java:2935)             @ android.os.handler.dispatchmessage(handler.java:99)             @ android.os.looper.loop(looper.java:137)             @ android.app.activitythread.main(activitythread.java:4921)             @ java.lang.reflect.method.invokenative(native method)             @ java.lang.reflect.method.invoke(method.java:511)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1038)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:805)             @ dalvik.system.nativestart.main(native method) 11-12 19:30:57.175  20071-20086/com.bayabro.bayabro v/mediaplayer﹕ message received msg=3, ext1=63, ext2=0

mywebview never initialized therefor null @ &&mywebview.cangoback().

make sure initialize mywebview calling mywebview = (webview) findviewbyid(r.id.webview)

to avoid npe:

else if(mywebview != null && key == keyevent.keycode_back && mywebview.cangoback()){     mywebview.goback();     return true; }

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