Suspended while debugging Android with AsyncTask -

here part of activity codes:

button.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                 iparser = new imageparser(mainactivity.this, earthqpicurl);                 iparser.execute();             }         }); 

and part of asynctask codes:

asyncresponse lempar; *//this interface* public imageparser(context actv, string earthqpicurl){    this.actv=actv;    this.earthqpicurl=earthqpicurl;    this.lempar = (asyncresponse) actv; } 

this interface code:

import android.graphics.bitmap;  public interface asyncresponse {     public void processfinish(bitmap output); } 

i use same code parsing jsondata, works. when use same constructor after modification class name, show error while debugging:

thread [<1> main] (suspended (exception classcastexception)) imageparser.<init>(context, string) line:25 mainactivity$1.oncllick(view) line: 23  

what's wrong code? can me? lot

these part of codes use in jsonparser:

asyncresponse delegate;  public jsonparser(context actv,string url){     this.actv=actv;     this.url = url;     this.delegate = (asyncresponse) actv; } 

same jsonparser, use interface named asyncresponse.

you casting object of type context asyncresponse:

this.lempar = (asyncresponse) actv; 

this what's causing error.