How to add “Go Back” function in WebView inside Fr

Question

UPDATE: Solved! Problem was related to my Viewpager not WebView.

I'm trying to add a "Go Back" function to my WebView which is inside a Fragment. But I can't figure out how to:

public final class TestFragment extends Fragment {

    static WebView mWeb;
    private View mContentView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState)
    {   
        mContentView = inflater.inflate(R.layout.webview, null);
        mWeb = (WebView)mContentView.findViewById(R.id.webview);

        WebSettings settings = mWeb.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setSupportZoom(false);
        mWeb.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        mWeb.getSettings().setBuiltInZoomControls(false);
        mWeb.loadUrl("myurl...");
        mWeb.setOnKeyListener(new OnKeyListener(){
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if ((keyCode == KeyEvent.KEYCODE_BACK) && mWeb.canGoBack()) {
                    mWeb.goBack();
                    return true;
                }
                return false;
            }
        });
    }   
}

I also tried something like:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK) && mWeb.canGoBack()) {
        mWeb.goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

Another solution but same problem:

@Override
public void onBackPressed()
{
    if(webView.canGoBack())
        webView.goBack();
    else
        super.onBackPressed();
}

Any ideas how to get this working?

Answer 1

my solution was in fragment I added to public methods

public static boolean canGoBack(){
        return mWebView.canGoBack();
    }

    public static void goBack(){
        mWebView.goBack();
    }

then from activity I call

@Override
public void onBackPressed() {
    if(webFragment.canGoBack()){
        webFragment.goBack();
    }else{
        super.onBackPressed();
    }

}

note The mwebview is static

Answer 2

In WebViewActivity.java, I added 1 method:

@Override
public void onBackPressed() {

    WebViewFragment fragment = (WebViewFragment)
            getSupportFragmentManager().findFragmentById(R.id.fragmentContainer);
    if (fragment.canGoBack()) {
        fragment.goBack();
    } else {
        super.onBackPressed();
    }
}

In WebViewFragment.java, I added 2 methods:

public boolean canGoBack() {
    return mWebView.canGoBack();
}

public void goBack() {
    mWebView.goBack();
}

Answer 3

Actually you can not do directly inside the fragment. The onBackPressed can be overridden in the FragmentActivity. What you can do is:

1. Override the onBackPressed inside the activity.
2. When the onBackPressed is called, check if the instance of the current fragment is the instance showing the webview.
3. If it is, ask the fragment if the webview can go back.
4. if it is not, call the super or whatever you need

Edit:

 @Override
 public void onBackPressed() {
       Fragment webview = getSupportFragmentManager().findFragmentByTag("webview");
       if (webview instanceof MyWebViewFragment) {
              boolean goback = ((MyWebViewFragment)webview).canGoBack();
              if (!goback)
                super.onBackPressed();
       }
 }

Answer 4

you can do this by :

• in the Activity put :

  // Set WebView
  
  public void setWebView(WebView web) {
  
      this.web = web;
  }
  

• in the web fragment after ActivityCreated() put:

  ((Your_Activity) getActivity()).setWebView(webView);

• Don't forget to set webView from the onCreateView() like these:

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
          Bundle savedInstanceState) {
      webView = (WebView) inflater.inflate(R.layout.your_web_fragment, container,
              false);
      return web;
  }
  

Answer 5

You can check this code :

    webView.canGoBack();
    webView.setOnKeyListener(new View.OnKeyListener() {

        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK
                    && event.getAction() == MotionEvent.ACTION_UP
                    && webView.canGoBack()) {
                webView.goBack();
                return true;
            }
            return false;
        }
    });

Answer 6

I've created a simple interface:

public interface IOnBackPressed {
    boolean onBackPressed();
}

in the Activity:

public class MyActivity extends Activity {
    @Override public void onBackPressed() {
    Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.main_container);
       if (!(fragment instanceof IOnBackPressed) || !((IOnBackPressed) fragment).onBackPressed()) {
          super.onBackPressed();
       }
    }
}

in the Fragment:

public class MyFragment extends Fragment implements IOnBackPressed {
   @Override
    public boolean onBackPressed() {
        if (webview.canGoBack()) {
            webview.goBack();
            // backpress is not considered in the Activity
            return true;
        } else {
            // activity will act normal
            return false;
        }
    }
}