java - how do i add a timer to make the line refresh and appear after evry 2 seconds? -

i making app make hands of clock.that is, draw simple line on screen , want rotate hands of clock.how do using timer?(so position of line refreshes).only 1 end point of line should rotate,while other remains staionary.in folllowing code,i draw line on screen:

drawview.java:

package linerefresh.xyz.com;  import java.util.timer; import java.util.timertask; import android.content.context; import android.graphics.canvas; import android.graphics.color; import android.graphics.paint; import android.view.view;  public class drawview extends view { paint paint = new paint();  public drawview(context context) {     super(context);     }  @override public void ondraw(final canvas canvas) {   paint.setcolor(color.black);  canvas.drawline(50, 200, 270, 200, paint);     } 

}

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linerefresh.java:

package linerefresh.xyz.com;  import android.app.activity; import android.graphics.color; import android.os.bundle;  public class linerefresh extends activity { drawview drawview;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     drawview = new drawview(this);     drawview.setbackgroundcolor(color.white);     setcontentview(drawview);  } } 

try this:

private handler mhandler = new handler();

private runnable methodtodrawclockline = new runnable()  {       public void run()      {           //execute here drawing routine.         // after drawing set timer x period of time         mhandler.postdelayed(methodtodrawclockline, 1000); //it'll re-execute after 1sec.       }   } 

in oncreate or method want start timer can use:

mhandler.removecallbacks(mupdatetimetask); //be sure remove handler before add new one
mhandler.postdelayed(methodtodrawclockline, 1000); //it'll execute after 1sec.

when you're done, remember remove handler. mhandler.removecallbacks(mupdatetimetask);

that shold it.