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I write a custom dialog and try to get some data from its parent activity, but I always get null when I call getOwnerActivity , could anyone tell me why this happen? Why I can show the data in the DemoDialog while failed to show data from TestDialogActivity? Many thanks in advance. DialogTestActivity public class DialogTestActivity extends Activity { List<String> data = new ArrayList<String>(); Button button; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button = (Button)findViewById(R.id.button); button.setOnClickListener(new OnClickListener(){ public void onClick(View v) { showDialog(0); } }); } public List<String> getData(){ data.add("one"); data.add("two"); data.add("three"); return data; } public Dialog onCreateDialog(int id){ return new DemoDialog(this); } } DemoDialog public class DemoDialog extends Dialog { Context context; public DemoDialog(Context context) { super(context); setContentView(R.layout.dialog); this.context = context; setTitle("Delete City"); ListView list = (ListView)findViewById(R.id.list); ArrayAdapter<String> aa = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_multiple_choice, ((DialogTestActivity)getOwnerActivity()).getData()); // ArrayAdapter<String> aa = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_multiple_choice, getData()); list.setAdapter(aa); list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); } private List<String> getData(){ List<String> data = new ArrayList<String>()

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