android webview 中localStorage无效的解决方法

mainWebView = (WebView)this.findViewById(R.id.mainWebView);
        WebSettings settings = mainWebView.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setAllowFileAccess(true);
        settings.setDatabaseEnabled(true);
         String dir = this.getApplicationContext().getDir("database", Context.MODE_PRIVATE).getPath();  
        settings.setDatabasePath(dir);  
        settings.setDomStorageEnabled(true);
        settings.setGeolocationEnabled(true);

mWebView.getSettings().setDomStorageEnabled(true);  
mWebView.getSettings().setAppCacheMaxSize(1024*1024*8); 
String appCachePath = getApplicationContext().getCacheDir().getAbsolutePath(); 
mWebView.getSettings().setAppCachePath(appCachePath); 
mWebView.getSettings().setAllowFileAccess(true); 

mWebView.getSettings().setAppCacheEnabled(true);