I created a chat following this example: http://warting.se/2012/06/04/chat-bubbles-in-android/ works fine but I want when I add a new message the message displayed on bottom of ListView instead added on top, like whatsapp.
I did
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="80dp"
android:divider="@android:color/transparent"
android:dividerHeight="0dp">
</ListView>
<RelativeLayout
android:id="@+id/form"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:orientation="vertical">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:ems="10"
android:id="@+id/chatText"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/buttonSend"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enviar"
android:id="@+id/buttonSend"
android:layout_alignBottom="@+id/chatText"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:background="@color/action_bar"
android:textColor="#FFF"/>
</RelativeLayout>
ListAdapter
public class DiscussArrayAdapter extends ArrayAdapter<OneComment> {
private TextView countryName;
private List<OneComment> countries = new ArrayList<OneComment>();
private LinearLayout wrapper;
public DiscussArrayAdapter(Context context, int resource) {
super(context, resource);
}
@Override
public void add(OneComment object) {
countries.add(object);
super.add(object);
}
public int getCount() {
return this.countries.size();
}
public OneComment getItem(int index) {
return this.countries.get(index);
}
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if (row == null) {
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.listitem_discuss, parent, false);
}
wrapper = (LinearLayout) row.findViewById(R.id.wrapper);
OneComment coment = getItem(position);
countryName = (TextView) row.findViewById(R.id.comment);
countryName.setText(coment.comment);
countryName.setBackgroundResource(coment.left ? R.drawable.bubble_yellow : R.drawable.bubble_green);
wrapper.setGravity(coment.left ? Gravity.LEFT : Gravity.RIGHT);
return row;
}
public Bitmap decodeToBitmap(byte[] decodedByte) {
return BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
}
}
Instead of this:
countries.add(object);
super.add(object);
Use this:
countries.add(0,object);
super.insert(0,object);
The 0
indicates the position in the array, namely the beginning.
You have to add the object in the first position. Try this:
@Override
public void add(OneComment object) {
countries.add(0, object);
super.insert(0, object);
}
You call "add" from the ArrayList, and "insert" from the ArrayAdapter.
I hope it helps.
I encountered the same problem some times ago. I re ordered the List
(in your case should be a List<OneComment>
) before passing it to the Adapter
.
For Java order reference here .
<ListView
android:stackFromBottom="true"
...
></ListView>
Add this line in ListView.
Use a LinearLayout inside a ScrollView . Set height of ScrollView as MATCH_PARENT and set height of LinearLayout as WRAP_CONTENT . Set gravity of ScrollView to BOTTOM . Set orientation of LinearLayout to VERTICAL . Create another XML layout for your chat_message_item and inflate this layout while popping up new messages. Inflate and add new items in LinearLayout as mLinearLayout.addView(chatMessageItem) .
This will work.
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