onSaveInstanceState is not working

Question

The last link is not opening while returning from other tab and also onPause() is not working .it shows null pointer exception and app closes automatically whilie clicking other tab except first one . fragment tab code

public class FragmentTab extends Fragment {
    protected WebView myWebView;
    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_layout, container, false);
        WebView myWebView = (WebView) v.findViewById(R.id.webview);
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        myWebView.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return false;
            }
        });
        if(savedInstanceState != null)
            myWebView.restoreState(savedInstanceState);
        else
            myWebView.loadUrl("http://www.example.com");
        return v;
    }
    @Override
public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        myWebView.saveState(outState);
    }
}

And Here are the MainActivity

public class MainActivity extends FragmentActivity {
    private FragmentTabHost mTabHost;

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

        setContentView(R.layout.activity_main);
        mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);
            mTabHost.addTab(
                    mTabHost.newTabSpec("tab1").setIndicator(null,ContextCompat.getDrawable(this,R.drawable.home)),
                    FragmentTab.class, null);
            mTabHost.addTab(
                    mTabHost.newTabSpec("tab2").setIndicator(null,ContextCompat.getDrawable(this,R.drawable.deals_offers)),
                    FragmentTab.class, null);
            mTabHost.addTab(
                    mTabHost.newTabSpec("tab3").setIndicator(null,ContextCompat.getDrawable(this,R.drawable.profile)),
                    FragmentTab.class, null);
            mTabHost.addTab(
                    mTabHost.newTabSpec("tab4").setIndicator(null, ContextCompat.getDrawable(this, R.drawable.menu)),
                    FragmentTab.class, null);
    }
}

Answer 1

Use This Library : https://github.com/frankiesardo/icepick

remove protected from WebView

@State 
WebView myWebView; // This will be automatically saved and restored

Add Following Line In Your Activity Method Rest Will Be Handled.

In OnCreate Method

@Override public void onCreate(Bundle savedInstanceState) 
   {
       super.onCreate(savedInstanceState);
       Icepick.restoreInstanceState(this, savedInstanceState);
   }

In onSaveInstanceState

@Override public void onSaveInstanceState(Bundle outState) 
   {
       super.onSaveInstanceState(outState);
       Icepick.saveInstanceState(this, outState);
   }

Answer 2

Look like myWebView always null in your code:

public class FragmentTab extends Fragment {
protected WebView myWebView;
@Override
public void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_layout, container, false);
    myWebView = (WebView) v.findViewById(R.id.webview);

    // instead of WebView myWebView = (WebView) v.findViewById(R.id.webview);

    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    myWebView.setWebViewClient(new WebViewClient() {
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return false;
        }
    });
    if(savedInstanceState != null)
        myWebView.restoreState(savedInstanceState);
    else
        myWebView.loadUrl("http://www.example.com");
    return v;
}
@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    myWebView.saveState(outState);
}
}