Cache the last view of a page for offline mode

Question

I have a problem with my cache system for android and what i want is to cache my last view for android and open it in offline mode but in case of online want the live page not the cached one if we take any website of price as an example like this one http://www.oil-price.net/ and this my java class code

public class Petroleum_price extends Fragment {


    public Petroleum_price() {
        // Required empty public constructor
    }

    Context context;
    WebView mwebView;


    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.activity_petroleum_price, container, false);
        context = container.getContext();
        mwebView = new WebView(context);
        mwebView = (WebView) v.findViewById(R.id.webView);
        WebSettings webSettings = mwebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        mwebView.getSettings().setAppCachePath( getActivity().getApplicationContext().getCacheDir().getAbsolutePath() );
        mwebView.getSettings().setAppCacheEnabled(true);
        mwebView.getSettings().setAllowFileAccess( true );
        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
        webSettings.setUseWideViewPort(true);
        webSettings.setSaveFormData(true);
        CookieManager.getInstance().setAcceptCookie(true);
        if ( !isNetworkAvailable() ) { // loading offline
            mwebView.getSettings().setCacheMode( WebSettings.LOAD_CACHE_ELSE_NETWORK );
        }

        mwebView.loadUrl( "http://www.oil-price.net/" );
        return v;
    }

    private boolean isNetworkAvailable() {
        ConnectivityManager connectivityManager = (ConnectivityManager) getActivity().getSystemService(CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
    }
}

Amir_P · Answer 1 · 2017-09-19T08:57:53.343

you can use this code for your WebView implementation

webView.getSettings().setDomStorageEnabled(true);
webView.getSettings().setAppCacheMaxSize( 10 * 1024 * 1024 );
webView.getSettings().setAppCachePath( getCacheDir().getAbsolutePath() );
webView.getSettings().setAllowFileAccess( true );
webView.getSettings().setAppCacheEnabled( true );
webView.getSettings().setJavaScriptEnabled( true );
webView.getSettings().setCacheMode( WebSettings.LOAD_DEFAULT );
if ( !isNetworkAvailable() ) {
    webView.getSettings().setCacheMode( WebSettings.LOAD_CACHE_ELSE_NETWORK );
}
webView.loadUrl( "http://www.google.com" );

private boolean isNetworkAvailable() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService( CONNECTIVITY_SERVICE );
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}

and use this codes in your manifest

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

based on the answer of WebView load website when online, load local file when offline

these code is implement in my code but doesn't cache, it open the page when i am online but if offline doesn't open any thing. and thanks a lot for your response — Asem Abd-elnaser, Sep 19 '17 at 08:51
my code is in fragment not activity is there problem with it ? — Asem Abd-elnaser, Sep 19 '17 at 08:52
test code again i changed it. no i don't think that causes problem @AsemAbd-elnaser — Amir_P, Sep 19 '17 at 09:00

Cache the last view of a page for offline mode

1 Answers1