Back Button Android WebView

Question

First off, I don't really know anything about Java at all.. I do front end dev and that's really it, I have tried looking through documentation and tutorials but am having issues.. I have a website and I am trying to get it to work on Android. I have pretty much everything working except pressing back on an Android device exits the app (Which is expected from what i've read)

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

Is what I tried adding to my code however I get the errors:

Error:(45, 24) error: non-static method canGoBack() cannot be referenced from a static context

Error:(46, 24) error: non-static method goBack() cannot be referenced from a static context

Error:(48, 22) error: cannot find symbol method onBackPressed()

Error:(43, 9) error: method does not override or implement a method from a supertype

Many thanks in advance!

PS - Here is the full code.

package com.appname.appname;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.view.KeyEvent;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    WebView myWebView = (WebView) findViewById(R.id.myWebView);
    myWebView.loadUrl("http://www.website.com");
    myWebView.setWebViewClient(new MyWebViewClient());

    //Settings
    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);

}

private class MyWebViewClient extends WebViewClient {

    //Open links internally
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if (Uri.parse(url).getHost().equals("www.website.com")) {
            return false;
        }
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
        startActivity(intent);
        return true;
    }

    //Back Button Fix

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

Thank you.

EDIT: I had also tried this code I found in another Stack post.

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            switch (keyCode) {
                case KeyEvent.KEYCODE_BACK:
                    if (WebView.canGoBack()) {
                        WebView.goBack();
                    } else {
                        finish();
                    }
                    return true;
            }

        }
        return super.onKeyDown(keyCode, event);
    }

I was told in a tutorial to press ctrl+o (In Android Studio) and select an Override for onKeyDown, but that isn't in my list. I then found that the onKeyDown was for pre 2.0 Phones? So I tried looking for onBackPressed but I couldn't find that either. I know this is going to be something really easy..

Answer 1

Try changing:

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

to:

@Override
public void onBackPressed()
{
    WebView webView = (WebView) findViewById(R.id.webView1);
    if(webView.canGoBack()){
        webView.goBack();
    }else{
        super.onBackPressed();
    }
}

Explanation: You should call canGoBack() and goBack() for the webview instance that you're using (move to the previous view). This is also why the method is declared at the instance level and not at the class level (static)

Update :

declare global

 WebView myWebView;


 this.myWebView = (WebView) findViewById(R.id.myWebView);

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

Full code :

 package com.appname.appname;

    import android.app.Activity;
    import android.content.Intent;
    import android.net.Uri;
    import android.os.Bundle;
    import android.webkit.WebSettings;
    import android.webkit.WebView;
    import android.webkit.WebViewClient;
    import android.view.KeyEvent;

    public class MainActivity extends Activity {

       WebView myWebView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.myWebView = (WebView) findViewById(R.id.myWebView);
        myWebView.loadUrl("http://www.website.com");
        myWebView.setWebViewClient(new MyWebViewClient());

        //Settings
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

    }

    private class MyWebViewClient extends WebViewClient {

        //Open links internally
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (Uri.parse(url).getHost().equals("www.website.com")) {
                return false;
            }
            Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(intent);
            return true;
        }

      }


        //Back Button Fix

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

Answer 2

Remove this :

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

from inside your inner class MyWebViewClient. It should be outside that class.

public class MainActivity extends Activity {

   ...
   ...
   private class MyWebViewClient extends WebViewClient {
      ...
      ...
   }
   ...
   @Override
   public void onBackPressed() {
        if (myWebView.canGoBack()) {
            myWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }
}