Have you looked at the log to see the stack trace? This would tell you
exactly why your app is crashing :)
On Fri, Dec 11, 2009 at 1:46 PM, Abhi <abhishek.r.sha...@gmail.com> wrote:
> Hi All,
>
> I have an Absolute Layout with two buttons on top, a Text View of
> fixed size in the middle and List View as the rest of the Layout.
>
> I want to use the top left button to add a list view item to the
> existing list and the top right button to remove the last item from
> the list. The List is layed out properly when the App starts, but as
> soon as any of the two buttons is pressed, the Activity Force Closes.
>
> Here is the code:
>
>
> package com.sample.headerlist;
>
> import java.util.ArrayList;
> import java.util.List;
>
> import android.app.Activity;
> import android.os.Bundle;
> import android.view.View;
> import android.widget.ArrayAdapter;
> import android.widget.Button;
> import android.widget.HeaderViewListAdapter;
> import android.widget.ListView;
> import android.widget.TextView;
>
> public class headerlist extends Activity implements
> View.OnClickListener
> {
> private ListView listView;
> private List<String> strings;
>
> �...@override
> public void onCreate(Bundle savedInstanceState)
> {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
>
> Button additem = (Button) findViewById(R.id.add_item);
> Button deleteitem = (Button) findViewById
> (R.id.del_item);
>
> listView = (ListView) findViewById(R.id.listView);
>
> additem.setOnClickListener(this);
> deleteitem.setOnClickListener(this);
>
> strings = new ArrayList<String>();
> strings.add("First");
> strings.add("Second");
> strings.add("Third");
> listView.setAdapter(new ArrayAdapter<String>(this,
> android.R.layout.simple_list_item_multiple_choice, strings));
> }
>
> �...@suppresswarnings("unchecked")
> �...@override
> public void onClick(View view)
> {
> if(view.getId() == R.id.add_item)
> {
> strings.add("another one");
> ((ArrayAdapter<String>)
> ((HeaderViewListAdapter) listView.getAdapter()).getWrappedAdapter
> ()).notifyDataSetChanged();
> }
> else if(view.getId() == R.id.del_item)
> {
> if(strings.size() > 0)
> {
> strings.remove(strings.size() - 1);
> ((ArrayAdapter<String>)
> ((HeaderViewListAdapter)listView.getAdapter()).getWrappedAdapter
> ()).notifyDataSetChanged();
> }
> }
> }
> }
>
>
> main.xml:
>
> <?xml version="1.0" encoding="utf-8"?>
> <AbsoluteLayout
> android:layout_width="fill_parent"
> android:layout_height="fill_parent"
> xmlns:android="http://schemas.android.com/apk/res/android";>
>
> <Button
> android:id="@+id/add_item"
> android:layout_width="120px"
> android:layout_height="wrap_content"
> android:text="Add Item"
> android:layout_x="0px"
> android:layout_y="0px"
>>
> </Button>
>
> <Button
> android:id="@+id/del_item"
> android:layout_width="120px"
> android:layout_height="wrap_content"
> android:text="Delete Item"
> android:layout_x="159px"
> android:layout_y="0px"
>>
> </Button>
>
> <TextView
>
> android:layout_width="315px"
> android:layout_height="25px"
> android:text="SEND TO:"
> android:textSize="20px"
> android:gravity="center_horizontal"
> android:layout_x="2px"
> android:layout_y="54px"
>>
> </TextView>
>
> <ListView
> android:id="@+id/listView"
> android:layout_width="fill_parent"
> android:layout_height="fill_parent"
> android:layout_x="0px"
> android:layout_y="82px"
>>
> </ListView>
>
> </AbsoluteLayout>
>
>
> Please Help.
>
> Abhishek
>
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--
Romain Guy
Android framework engineer
romain...@android.com
Note: please don't send private questions to me, as I don't have time
to provide private support. All such questions should be posted on
public forums, where I and others can see and answer them
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