android - How to draw a line over a GridView programmatically -


i new posting on stack overflow, best descriptive here.

right playing around android studio. have set gridview (i built own custom image adapter) contains square images form 5 6 grid padding in-between each grid space. want able draw line (using canvas , paint) on top of gridview programatically.

i have looked @ quite few posts on stack overflow in order try , solve issue, such one: draw line on top of existing layout programmatically

when following instructions link above ^^^, able create program draws line on imageview.

but when use similar code in program tries draw line on gridview, draws line , nothing else.

here code snippets of i'm trying do. xml file:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">      <!-- game layout *er -->     <gridview xmlns:android="http://schemas.android.com/apk/res/android"         android:id="@+id/gridviewgame"         android:layout_width="match_parent"         android:layout_weight="1"         android:layout_height="0dp"         android:numcolumns="5"         android:stretchmode="columnwidth"         android:gravity="center"         />      <com.example.ella.lazorsgame.drawview         android:id="@+id/paintview"         android:layout_width="match_parent"         android:layout_height="match_parent"         />  </linearlayout>

this custom view code:

public class drawview extends view {     paint paint = new paint();     private int strokewidth = 8;      public drawview(context context, attributeset attrs) {         super(context, attrs);         paint.setcolor(color.red);         paint.setstrokewidth(strokewidth);     }      @override     public void ondraw(canvas canvas) {         canvas.drawline(0, 0, 300, 300, paint);     }  }

and i'm drawing grid of images in main activity (this code works itself... grid doesn't show when try , draw line on top):

public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_game_setup);          gridview gridview = (gridview) findviewbyid(r.id.gridviewgame);         blockgridadapter = new imageadapter(this, r.drawable.selectedblock, 30);          // set grid space object array *er         (int = 0; < blockspaces.length; i++) {             blockspaces[i] = new blockspace(gridview, i);         }          // set grid visual display on phone screen *er         gridview.setadapter(blockgridadapter);          // ------------- initial game setup (block placements) -------------- *er         blocksetup(levelselected);          gridview.setonitemclicklistener(new adapterview.onitemclicklistener() {             public void onitemclick(adapterview<?> parent, view v, int position, long id) {                 updateselection(position);             }         });     }

thank help! let me know if more information needed.

you not calling super method of ondraw

super.ondraw(canvas);

thus thing drawn line , system doesn't handle other views invalidated , needs de redrawn!!!

check out: http://developer.android.com/training/custom-views/custom-drawing.html


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