android webview back button setOnClickListener

Issue

I set a button on my main layout that should execute goBack method of webview that is set on another layout. Application crashes when setOnClickListener for backButton. What I am doing wrong? Thank you.

webView class,

 public class webPush extends Activity {

        WebView webview; 
        Button backButton;

        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            setContentView(R.layout.webview); 

            webview = (WebView) findViewById(R.id.webview1);

            backButton = (Button)findViewById(R.id.button1);

            backButton.setOnClickListener(new OnClickListener() 
            {
                  @Override 
                  public void onClick(View arg0) 
                  {
                      webview.goBack();
                  }
            });

            webview.getSettings().setJavaScriptEnabled(true);       

            webview.setWebViewClient(new WebViewClient());

            webview.loadUrl("http://www.google.com");

        }

from main layout,

<Button
                 android:id="@+id/button1"
                 style="?android:attr/buttonStyleSmall"
                 android:layout_width="78dp"
                 android:layout_height="wrap_content"
                 android:layout_weight="0.02"
                 android:text="Back" />

Solution

in which layout u have placed button? is it in main.xml or webview layout? if the button is in main.xml then setContentView(R.layout.main);

Answered By - sush