how to implement a dialog box on button click in android

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Mobile

Android

i have a button and have set its onclick listener that checks the number if times a button was clicked, i used if else statement for doing it. now in the else statement i need to implement a dialoge box. This is the code i used by i'm getting errors. need help

public void onClick(View v) {
			// TODO Auto-generated method stub
			clickCount=clickCount+=1;
			try {
				
				if(clickCount<=5){
					Intent intent = new Intent(ACTION_SCAN);

					intent.putExtra("SCAN_MODE", "PRODUCT_MODE");

	       		startActivityForResult(intent, 0);
	
				}
				else
				{
					AlertDialog.Builder alertdialogBuilder=new AlertDialog.Builder(getApplicationContext());
					alertdialogBuilder.setMessage(R.string.decision);
					alertdialogBuilder.setPositiveButton(R.string.positive_button, new DialogInterface.OnClickListener() {
						
						@Override
						public void onClick(DialogInterface dialog, int which) {
							// TODO Auto-generated method stub
							Intent positveActivity = new Intent(getApplicationContext(),MainActivity.class);
				            startActivity(positveActivity);	
						}
					}); 
					 AlertDialog alertDialog = alertdialogBuilder.create();
				      alertDialog.show();
					//Toast.makeText(getApplicationContext(), "Reached Maximum scan Primay" , Toast.LENGTH_LONG).show();
					//Intent i1=new Intent(getApplicationContext(),MainActivity.class);
					//startActivity(i1);
				}
	             //start the scanning activity from the com.google.zxing.client.android.SCAN intent

							} catch (ActivityNotFoundException anfe) {

       //on catch, show the download dialog

			showDialog(Secondary.this, "No Scanner Found", "Download a scanner code activity?", "Yes", "No").show();

			}

		}	
		});
}