I need to make a list view. What you need now is that pressing the button dynamically adds new elements It's a code that's easy for me to understand without performance improvement or anything.
I know similar questions are already posted on this site, but it's a little different from exactly what I want. Help me.
android listview dynamic
First, define xml. res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="@+id/addBtn"
android:text="Add New Item"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="addItems"/>
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false"
/>
</LinearLayout>
This completes a simple layout with the button above and the list view below. Remember that the ID of the list view is @android:id/list. Used to define ListView in ListActivity.
public class ListViewDemo extends ListActivity {
//Initialize elements to be listed
ArrayList<String> listItems=new ArrayList<String>();
//Adapter declaration to handle data in the list
ArrayAdapter<String> adapter;
//Variants that store how many clicks a button has been clicked
int clickCounter=0;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
adapter=new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
listItems);
setListAdapter(adapter);
}
//Methods for dynamically adding elements to the list
public void addItems(View v) {
listItems.add("Clicked : "+clickCounter++);
adapter.notifyDataSetChanged();
}
}
Android.R.layout.simple_list_item_1 is the default list element layout provided by Android.
listItems is an array that stores elements in the list. If you want to add and delete elements in the list, you can add and delete elements in the listItems. And that processing in ArrayAdapter adapter
adapter.notifyDataSetChanged();Like this.
The adapter contains three items, one for Context, one for list item layout for listactivity, and one for actual data to show each item.
adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,listItems);
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