[android-developers] Re: Andrlid ListView focus mess up with two focusable items in each row
Thanks for the tip. But since the new data is coming back from server, I need to update the UI instead of just updating some of the data set, since now the data in the listview is more when some new data is coming back from server. On Dec 9, 6:45 pm, Kostya Vasilyev kmans...@gmail.com wrote: You don't really have to go through notifyDataSetChanged to update the UI. If you know that the set of items stays the same (i.e. only their data changed), you can iterate the listview's children and update them bypassing the adapter. -- Kostya 09.12.2011 14:10, yanguoc...@gmail.com пишет: Thanks. But seems hard to maintain focus in a listview before and after the latyout pass. I check the source code of listview, it did something that may broke the focus in layout pass. On Dec 9, 5:46 am, lbendlinl...@bendlin.us wrote: you will need to remember (per row) which item has focus, and when the list adapter reloads you will have to apply that knowledge and set requestFocus() to the appropriate item. -- Kostya Vasilyev -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Andrlid ListView focus mess up with two focusable items in each row
Thanks. But seems hard to maintain focus in a listview before and after the latyout pass. I check the source code of listview, it did something that may broke the focus in layout pass. On Dec 9, 5:46 am, lbendlin l...@bendlin.us wrote: you will need to remember (per row) which item has focus, and when the list adapter reloads you will have to apply that knowledge and set requestFocus() to the appropriate item. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Andrlid ListView focus mess up with two focusable items in each row
In my application, I want to implement a ListView, of each itemview is
a LinearLayout with two focusable buttons in it horziontally, and each
row item data loads from server in page. But it seems that when
adapter.notifyDataSetChanged is invoked, if the focus is on the right
button of the itemview, it will jump to the left button. Any way I can
make the focus stable ?
Following is my sample code to reproduce the problem. Any one can help
give some suggestion? Thanks.
package com.listviewfocus;
import java.util.Vector;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
public class SimpleActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ListView list = new ListView(this);
final MyAdapter adapter = new MyAdapter();
list.setItemsCanFocus(true);
list.setAdapter(adapter);
setContentView(list);
final Handler handler = new Handler();
new Thread(new Runnable(){
public void run() {
while(true) {
handler.post(new Runnable() {
public void run() {
adapter.addItem(System.currentTimeMillis()
+);
}
});
try {
Thread.currentThread().sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}).start();
}
class MyAdapter extends BaseAdapter {
private VectorString items = new VectorString();
public MyAdapter() {
}
public void addItem(String s) {
items.add(s);
this.notifyDataSetChanged();
}
@Override
public int getCount() {
return items.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup
parent) {
LinearLayout view;
if (convertView instanceof LinearLayout) {
view = (LinearLayout) convertView;
} else {
view = new LinearLayout(parent.getContext());
Button b1 = new Button(parent.getContext());
Button b2 = new Button(parent.getContext());
view.addView(b1);
view.addView(b2);
}
((Button)(((ViewGroup)
view).getChildAt(0))).setText(position+:b1);
((Button)(((ViewGroup)
view).getChildAt(1))).setText(position+:b2);
return view;
}
}
}
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