Does somebody know why ListActivity
won't work and when I change it to Activity base class, with slight changes it works, but onClick()
method still doesn't. I'm trying only to put some strings into the list... Here's the code:
public class TestDataBaseActivity extends Activity implements OnClickListener {
private CommentsDataSource datasource;
ListView m_list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
datasource = new CommentsDataSource(this);
datasource.open();
List<Comment> values = datasource.getAllComments();
m_list = (ListView) findViewById(R.id.listView1);
// Use the SimpleCursorAdapter to show the
// elements in a ListView
ArrayAdapter<Comment> adapter = new ArrayAdapter<Comment>(this,
android.R.layout.simple_list_item_1, values);
m_list.setAdapter(adapter);
Button add = (Button)findViewById(R.id.button_add);
Button delete = (Button)findViewById(R.id.button_delete);
add.setOnClickListener(this);
delete.setOnClickListener(this);
}
// Will be called via the onClick attribute
// of the buttons in main.xml
@Override
public void onClick(View view) {
@SuppressWarnings("unchecked")
ArrayAdapter<Comment> adapter = (ArrayAdapter<Comment>) m_list.getAdapter();
Comment comment = null;
switch (view.getId()) {
case R.id.button_add:
String[] comments = new String[] {
"Cool", "Very nice", "Hate it"
};
int nextInt = new Random().nextInt(3);
// Save the new comment to the database
comment = datasource.createComment(comments[nextInt]);
adapter.add(comment);
break;
case R.id.button_delete:
if (m_list.getAdapter().getCount() > 0) {
comment = (Comment) m_list.getAdapter().getItem(0);
datasource.deleteComment(comment);
adapter.remove(comment);
}
break;
}
adapter.notifyDataSetChanged();
}
@Override
protected void onResume() {
datasource.open();
super.onResume();
}
@Override
protected void onPause() {
datasource.close();
super.onPause();
}
}
Here is XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".TestDataBaseActivity" >
<Button
android:id="@+id/button_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/add_new" />
<Button
android:id="@+id/button_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/button_add"
android:text="@string/delete_first" />
<ListView
android:id="@+id/listView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/button_add"
android:padding="15dp" >
</ListView>
</RelativeLayout>
I edited now to extend Activity, now "only" onClick() dont work... Thanks in advance!
For a ListActivity, you should override onListItemClick()
instead:
@Override
protected void onListItemClick(ListView lv, View v, int position, long id){
}
Since you are extending ListActivity
you need to have an Listview
with android:id="@android:id/list".
if you want to use @+id/lst_id
then dont extend ListActivity, just extended Activity.
And whenever you are using Listview you need to implement OnItemClickListener
not OnClickListener
.
and override the default OnItemClick
method
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
}
you should implement OnClickListener
public class TestDatabaseActivity extends ListActivity implements
OnClickListener{
try following code a simple list activity
public class MainActivity extends ListActivity implements OnItemClickListener {
ListView listView;
static final String[] SPORTS = {"Shuttle Badminton", "Tennis", "FootBall",
"Basket Ball","Table Tennis", "Chess","Hockey"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listView = getListView();
//setting adapter
listView.setAdapter(new ArrayAdapter<String>(getApplicationContext(),R.layout.list_item,SPORTS));
listView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
TextView tv = (TextView)view.findViewById(R.id.text1);
Toast.makeText(getApplicationContext(),"Position is: "+position,Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(),"Text is: "+tv.getText().toString(),Toast.LENGTH_SHORT).show();
}
}
here list_item is an xml having following code
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/text1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textColor="@android:color/black"
android:padding="10dp" />
Use this code for list activity and modify row xml according to your needs. hope this helps..
This is what's troubling you:
ArrayAdapter<Comment> adapter = (ArrayAdapter<Comment>) m_list.getAdapter();
Build a global object for your adapter instead. ( Declare it before onCreate() )
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