Webview

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

        //hide statusbar
        if (Build.VERSION.SDK_INT < 16) {
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
            setContentView(R.layout.activity_main);
        } else {
            setContentView(R.layout.activity_main);
            android.support.v7.app.ActionBar ab = getSupportActionBar();
            ab.hide();
        }

        //setup our webview
        WebView myWebView = (WebView) findViewById(R.id.webView);
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setAppCacheEnabled(true);
        webSettings.setBuiltInZoomControls(false);
        webSettings.setDomStorageEnabled(true);
        webSettings.setDatabaseEnabled(true);
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
            webSettings.setDatabasePath("/data/data/" + myWebView.getContext().getPackageName() + "/databases/");
        }
        webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
        myWebView.setBackgroundColor(Color.parseColor("#147F52"));
        myWebView.loadUrl("file:///android_asset/index.html");
    }

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