How do I stop Flash after leaving a WebView?

I have an app that I've put together to stream flash video in a webview when a user clicks a button.

It does this fine, but after backing out or losing focus, it looks like it continues to use data for a while until I assume when the system shuts the activity down. If I manually kill out of the activity screen, data use stops almost immediately. Just backing out and it can keep going for a while.

Can someone help me out with my code, I would really appreciate it!

import java.lang.reflect.Method;
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;

public class Video extends Activity {


    private WebView webview;


    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.video);


    webview = (WebView) findViewById(R.id.webview);

// resumeTimers() to account for the webview refcount bug (hopefully)
    webview.resumeTimers();
    WebSettings webSettings = webview.getSettings();
    webview.getSettings().setJavaScriptEnabled(true);
    webSettings.setPluginsEnabled(true);
    webview.setVerticalScrollBarEnabled (false);
    webview.setHorizontalScrollBarEnabled (false);

    webview.loadUrl("http://www.nasa.gov/multimedia/nasatv/nasatv_android_flash.html");
}


@Override
protected void onPause() {
pauseBrowser();
super.onPause();
}

@Override
protected void onResume() {
resumeBrowser();
super.onResume();
}



private void pauseBrowser() {

// pause flash and javascript etc
callHiddenWebViewMethod(webview, "onPause");
webview.pauseTimers();
}

private void resumeBrowser() {

// resume flash and javascript etc
callHiddenWebViewMethod(webview, "onResume");
webview.resumeTimers();
}

private void callHiddenWebViewMethod(final WebView wv, final String name){
    if( webview != null ){
        try {
            Method method = WebView.class.getMethod(name);
            method.invoke(webvi