android - 在 webview 准备好之前如何做进度条？

Question

我有一个带有 WebView 的应用程序，带有 HTML 代码 iframe。WebView url 通过菜单更改，需要几秒钟的时间。我想在 WebView 准备好使用之前创建 ProgressBar。我该怎么做？

注意:

如果你给我评价我检查菜单值的方式，我会很高兴

这是我在 PasteBin 中的代码: http://pastebin.com/6gXZxvds

或在这里:

主要 Activity :

public class MainActivity extends Activity {
    String[] menu;
    DrawerLayout dLayout;
    ListView dList;
    ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        menu = new String[]{"home","soccer","basketball"};
        dLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        dList = (ListView) findViewById(R.id.right_drawer);
        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,menu);
        dList.setAdapter(adapter);
        dList.setSelector(android.R.color.holo_blue_dark);
        dList.setOnItemClickListener(new OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {

                dLayout.closeDrawers();         
                Bundle args = new Bundle();
                args.putString("Menu", menu[position]);
                Fragment detail = new DetailFragment();
                detail.setArguments(args);
                FragmentManager fragmentManager = getFragmentManager();       
                fragmentManager.beginTransaction().replace(R.id.content_frame, detail).commit();

            }

        });

    }



}

细节 fragment :

public class DetailFragment extends Fragment {
    //TextView text;
    String str;
    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle args) {

        View view = inflater.inflate(R.layout.menu_detail_fragment, container, false);
        String menu = getArguments().getString("Menu");
        /*text= (TextView) view.findViewById(R.id.detail);
        text.setText(menu);*/

        if(menu.equals("home"))
        {
            str = "<iframe src='http://www.fcbj.co.il/' style='min-height: 100%; width: 100%; border: 0px;'></iframe>";
        }
        else if (menu.equals("soccer")) {
            str = "<iframe src='http://www.fcbj.co.il/News/' style='min-height: 100%; width: 100%; border: 0px;'></iframe>";
        }
        else if(menu.equals("basketball"))
        {
            str = "<iframe src='http://www.fcbj.co.il/basketball/News/' style='min-height: 100%; width: 100%; border: 0px;'></iframe>";
        }

        WebView browser =(WebView)view.findViewById(R.id.webPage);
        WebSettings settings    =   browser.getSettings();
        settings.setJavaScriptEnabled(true);
        browser.loadData(str,"text/html","UTF-8");


        return view;
    }


}

谢谢大家:)

Answer 1

尝试将 WebChromeClient 设置为 webview :

browser.setWebChromeClient(new WebChromeClient() {
     @Override
     public void onProgressChanged(WebView view, int newProgress) {
         super.onProgressChanged(view, newProgress);
         // change webview progress here                 
     }
});