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

webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setAppCacheEnabled(false);
webview.getSettings().setDomStorageEnabled(true);
webview.getSettings().setDatabaseEnabled(true);
webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);