Android cannot close drawer inside onReceivedError

Mobile
1

I have this code within onCreate:

webView.setWebViewClient(new WebViewClient() {

    final ProgressDialog progress = new ProgressDialog(MainActivity.this);
    .
    .
    public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
        view.loadUrl("file:///android_asset/www/error.html");
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.openDrawer(GravityCompat.START);
        progress.dismiss();
    }

});

When there is no internet connection it successfully detects the error and loads error.html. However, it refuses to open the drawer. Also, it closes the progress dialog whether I comment out that line or not. The drawer opens and closes fine when the back button is pressed:

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        drawer.openDrawer(GravityCompat.START);
    }
}

Why will the drawer not open inside onReceivedError?

2

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