Android, How to get/set layout parameters? -


in application have conversation room. of messages should aligned right while rest should left aligned.

single row of list this:

<?xml version="1.0" encoding="utf-8"?>  <linearlayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:id="@+id/llcontainer" >      <linearlayout         android:orientation="vertical"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_margin="5dp"         android:background="@drawable/speech_bubble_orange"         android:id="@+id/llgroup" >              <textview                 android:id="@+id/message_text"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:shadowcolor="@color/message_textshadow"                 android:shadowdx="1"                 android:shadowdy="1"                 android:text="medium text"                 android:textcolor="@color/message_textcolor"                 android:textsize="20sp" />              <textview                 android:id="@+id/message_date"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:text="@string/temp_date"                 android:gravity="right"                 android:layout_marginleft="4dp"                 android:layout_marginright="4dp"/>     </linearlayout>  </linearlayout>

getview() of adapter this:

@override public view getview(final int position, view convertview, viewgroup parent) {     viewholder holder;      if (convertview == null) {         convertview = myinflater.inflate(r.layout.list_message_row, null);         holder = new viewholder();          holder.tvmessagebody = (textview) convertview.findviewbyid(r.id.message_text);         holder.tvmessagedate = (textview) convertview.findviewbyid(r.id.message_date);         holder.llcontainer = (linearlayout) convertview.findviewbyid(r.id.llcontainer);         holder.llgroup = (linearlayout) convertview.findviewbyid(r.id.llgroup);          convertview.settag(holder);     } else {         holder = (viewholder) convertview.gettag();     }      holder.tvmessagebody.settext(messagelist.get(position).getmessagebody());     string date = messagelist.get(position).getsentdate();     holder.tvmessagedate.settext(formatfancieddate(date));      linearlayout.layoutparams params = (linearlayout.layoutparams) holder.llcontainer.getlayoutparams();     try {         if(messagelist.get(position).ismine()) {             holder.llgroup.setbackgroundresource(r.drawable.speech_bubble_green);             params.gravity = gravity.right;         }         //if not mine sender show orange background , align left         else {             holder.llgroup.setbackgroundresource(r.drawable.speech_bubble_orange);             params.gravity = gravity.left;         }          holder.llcontainer.setlayoutparams(params);      } catch (nullpointerexception e) {         e.printstacktrace();     }      return convertview; }

i think should fine when run application nullpointerexception happens , points params.gravity = gravity.right; or params.gravity = gravity.left; (depends on ismine() method).

what think? mistake? suggestion appreciated.

use relativelayout params , set gravity this, work.

relativelayout.layoutparams params = new relativelayout.layoutparams(relativelayout.layoutparams.wrap_content, relativelayout.layoutparams.wrap_content); params.addrule(relativelayout.align_parent_right, relativelayout.true);

this working me in application.


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