title: Using the Back Button on WebView
body: <p>I cant figure out why the application keeps crashing once i press the back button on my phone. Im trying to use the back button to go back a page while on the WebView</p>
  
  <p>This is my code:</p>
  
  <pre><code>package com.***.****;
  
  import android.app.Activity;
  import android.os.Bundle;
  import android.view.KeyEvent;
  import android.view.Window;
  import android.view.WindowManager;
  import android.webkit.WebSettings;
  import android.webkit.WebView;
  import android.webkit.WebViewClient;
  
  
  public class MainActivity extends Activity {
  
  WebView myWebView;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      // TODO Auto-generated method stub
      super.onCreate(savedInstanceState);
      requestWindowFeature(Window.FEATURE_NO_TITLE);
      getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
      setContentView(R.layout.activity_main);
  
      WebView myWebView = (WebView) findViewById(R.id.webview);
      myWebView.setWebViewClient(new WebViewClient());
      WebSettings webSettings = myWebView.getSettings();
      webSettings.setJavaScriptEnabled(true);
      myWebView.loadUrl("*****");
  }
  
   @Override
   public boolean onKeyDown(int keyCode, KeyEvent event) {
      // Check if the key event was the Back button and if there's history
      if ((keyCode == KeyEvent.KEYCODE_BACK) &amp;&amp; myWebView.canGoBack()) {
          myWebView.goBack();
          return true;
      }
      // If it wasn't the Back key or there's no web page history, bubble up to the default
      // system behavior (probably exit the activity)
      return super.onKeyDown(keyCode, event);
  }
  }
  </code></pre>
  
  <p>This is what comes up when i click the back button</p>
  
  <pre><code>11-28 14:13:17.768: E/AndroidRuntime(3636): FATAL EXCEPTION: main
  11-28 14:13:17.768: E/AndroidRuntime(3636): java.lang.NullPointerException
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at com.triplec.googledeveloper.MainActivity.onKeyDown(MainActivity.java:35)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.view.KeyEvent.dispatch(KeyEvent.java:2756)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.app.Activity.dispatchKeyEvent(Activity.java:2428)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2076)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:4192)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.view.ViewRootImpl.handleImeFinishedEvent(ViewRootImpl.java:4121)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3169)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.os.Handler.dispatchMessage(Handler.java:99)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.os.Looper.loop(Looper.java:137)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at android.app.ActivityThread.main(ActivityThread.java:5328)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at java.lang.reflect.Method.invokeNative(Native Method)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at java.lang.reflect.Method.invoke(Method.java:511)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
  11-28 14:13:17.768: E/AndroidRuntime(3636):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>