How do I display 2 views in 1 activity (android)?

Question

Suppose I have a webview open:

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    main_webv = (WebView) findViewById(R.id.mainwebview);
    main_webv.setWebViewClient(new HelloWebViewClient());
    main_webv.getSettings().setJavaScriptEnabled(true);
    main_webv.getSettings().setSupportZoom(false);
    main_webv.addJavascriptInterface(new HelloJavascriptInterface(),"hello");
    main_webv.setWebChromeClient(new HelloWebChromeClient());
    main_webv.loadUrl(SPLASH);   
    main_webv.setVisibility( 4 );

    setContentView(R.layout.main_list);         
    main_listv = (ListView) findViewById(R.id.mainlistview);    


}

I simply want to create a ListView above this webview (covering it up...but sitll allowing the webview to run). I could toggle the views on and off. Thanks.

Answer 1

You can use FrameLayout; that way both the Views will be arranged on top of another. You can then toggle their visibility using the View.setVisibility(..) method.

[EDIT: ADDED CODE]

This is my layout XML(weblister.xml):

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <ListView
    android:id="@+id/list_view"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    />
    <WebView
    android:id="@+id/webview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    />

</FrameLayout>

Now, I create an Activity which will have both ListView and WebView in its View heirarchy but only one of them would be Visible:

public class WebAct extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.weblister);

            //setup listview
        ListView listView = (ListView) findViewById(R.id.list_view);
        listView.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1,
                new String[]{"One","Two"}){

        });
            // setup web view
        WebView webView = (WebView) findViewById(R.id.webview);

        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setSupportZoom(false);

        webView.loadUrl("http://www.google.com");

            // set visibility    
        listView.setVisibility(View.INVISIBLE);
        webView.setVisibility(View.VISIBLE);
    }

}

Note: The code might not be complete but I hope it does convey my point to you.

Answer 2

Yes, setVisibility will probably help you if you want to programmatically switch Views on (View.VISIBLE) and off (VIEW.GONE).

Concerning your comment to Samuhs answer: In Java you don't have multiple inheritance. But ListActivity inherits from Activity so a ListActivity is pretty much the same (and more) as an Activity.

Also, you don't have to use a ListActivity to display ListViews, it simply provides some convenience-stuff for handling list based activities since they are so common.

What exactly is the error you get?