still didnt get @android:id/list vs @+id/listView1

when extendin开发者_JAVA百科g listactivity it is must to have a @android:id/list

question 1> what if i want to implement 2 listviews then ids will be same @android:id/list.

question 2> in what scenario i should use @+id/listView1.

Thanks in advance.

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Well, the ID is independant(unless you don't name them uniquely) so you'd use the "@+id/listView1" solution every time as far as I know. I did this on my own Android app and it worked just fine.

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ListActivity is basically a 'convenience' class which simply extends Activity and has a single ListView plus some convenience methods for handling it - there's nothing particularly special about it.

If you want an Activity which has more than one ListView then it would be better to simply create your own from scratch.

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If you create a Xml with let's say a relativelayout that contains a imageview on the top and a listview in the middle and a button in the bottom. Then you need to set an uniqe ID for your listview to gain access to it. ex:

<ListView
   android:"@+id/unique_listview"
   android:layout_width="fill_parent"
   android:layout_height="400px"
/>

Then you can customize and populate the listView with this:

ListView myList = (ListView) findViewById(R.id.unique_listview);
myList.setAdapter(new myListAdapter(this));


private class myListAdapter extends BaseAdapter {
....
}