android - Why height of RelativeLayout change when I add a view to RelativeLayout. -

i'm drawing lines in relative layout.to this, add line views add relative layout. when add drawed lines relative layouts relative layout's height changes. why ? in advance ! :)

layout.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent"     android:layout_height="fill_parent"     tools:context="com.mobisoft.kelimebul.local.oyun"     android:backgroundtint="#ffffcd8d"     android:backgroundtintmode="multiply"     android:background="#ffff9f63"     android:padding="7dp"     android:id="@+id/s"     android:orientation="vertical">      <relativelayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/relative"         android:touchscreenblocksfocus="true"         android:nestedscrollingenabled="true"         android:layout_weight="1">          <gridview             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:id="@+id/gameboard"              android:listselector="#00000000"             android:background="@color/tahta_rengi"             android:scrollbars="none"             android:fastscrollalwaysvisible="false"             android:fastscrollenabled="false"             android:focusable="false"             android:focusableintouchmode="false"             android:drawselectorontop="true" />     </relativelayout>       <horizontalscrollview         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:id="@+id/horizontalscrollview"         android:background="@color/tahta_rengi"         android:layout_weight="1">          <linearlayout             android:orientation="horizontal"             android:layout_width="fill_parent"             android:layout_height="fill_parent"             android:id="@+id/scrolinear">          </linearlayout>     </horizontalscrollview>           <relativelayout             android:orientation="horizontal"             android:layout_width="fill_parent"             android:layout_height="wrap_content"              android:background="@color/backgroundcolor"             android:backgroundtint="@color/backgroundcolortint"             android:visibility="visible"             android:layout_weight="1">              <linearlayout                 android:orientation="horizontal"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_alignparentright="true"                 android:layout_marginright="5dp"                 android:layout_centerhorizontal="true">                  <imageview                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:id="@+id/timeicon"                     android:src="@drawable/clock"                     android:scaletype="fitcenter"                     android:layout_gravity="center_horizontal"                     android:layout_marginright="4dp" />                  <textview                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:textappearance="?android:attr/textappearancemedium"                     android:id="@+id/time"                     android:gravity="center_vertical|center|right|center_horizontal"                     android:textsize="@dimen/score_textsize"                     android:layout_gravity="right"                     android:textalignment="center"                     android:layout_alignparentright="true" />             </linearlayout>              <linearlayout                 android:orientation="horizontal"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_alignparentleft="true">                  <textview                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:textappearance="?android:attr/textappearancemedium"                     android:text="@string/remainingwordn"                     android:id="@+id/textview5"                     android:textsize="@dimen/score_textsize" />                  <textview                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:textappearance="?android:attr/textappearancemedium"                     android:id="@+id/remainingnumber"                     android:textsize="@dimen/score_textsize" />             </linearlayout>         </relativelayout>  </linearlayout> 

activity.java // part code of activity

     drawview drawview; drawview = new drawview(getapplicationcontext(), locs, view.getwidth(), colors.get(linecolor));                              relativelayoutoflines.addview(drawview); // add view relativelayouts 

drawview.java

public class drawview extends view { paint paint = new paint(); float locs[]; int strokewidth; int color;  public drawview(context context, float locs[], int strokewidth, int color) {     super(context);     this.locs = locs;     this.strokewidth = strokewidth;     this.color = color; }  @override public void ondraw(canvas canvas) {      paint.setcolor(getcontext().getresources().getcolor(color));     paint.setalpha(100);     paint.setstrokewidth(strokewidth);       canvas.drawline(locs[0], locs[1], locs[2], locs[3], paint);  // left, top, right, bottom      canvas.save();     canvas.restore();  }  } 

before drawing: https://www.dropbox.com/s/oo79d8rvp4sa2nj/s.png?dl=0

after drawing : https://www.dropbox.com/s/vawjsxcbi6gd2go/s2.png?dl=0