سلام لطفا کمکم بکنید خیلی مهم و ضروریه

مشکل من دو تاست 1:کد شو میزارم مشکلم اینه که یه متغیر به اسم number دارم که با هر با کلیک اضافه میشه تا به عدد بیست میرسه بعد میشه صفر دوباره تا بیست میشمره، دوتا باتن دارم یکی کم ودیگری اضافه میکنه مشکلم اینه که میخوام با اضافه شدن و یا کم شدن طبق اون عددnumber تعداد اشیایی نشون داده بشه مثلا گل،از سوییچ استفاده کردم ولی اررور force close میده

 package a.b.c;

import java.util.Random;

import a.b.c.R.raw;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;


	public class Tutorialnumber extends Activity {
		int number=0;
		MediaPlayer mp;
	    @Override
	    protected void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.tutorialnumber);

	        //setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

	        final TextView tv1=(TextView) findViewById(R.id.textview1);

	        final ImageView iv1=(ImageView) findViewById(R.id.imageView1);
	        final ImageView iv2=(ImageView) findViewById(R.id.ImageView02);
	        final ImageView iv3=(ImageView) findViewById(R.id.ImageView03);
	        final ImageView iv4=(ImageView) findViewById(R.id.ImageView04);
	        final ImageView iv5=(ImageView) findViewById(R.id.ImageView05);
	        final ImageView iv6=(ImageView) findViewById(R.id.ImageView06);	               
	        final ImageView iv7=(ImageView) findViewById(R.id.ImageView07);
	        final ImageView iv8=(ImageView) findViewById(R.id.ImageView08);
	        final ImageView iv9=(ImageView) findViewById(R.id.ImageView09);
	        final ImageView iv10=(ImageView) findViewById(R.id.imageView10);
	        final ImageView iv11=(ImageView) findViewById(R.id.imageView11);
	        final ImageView iv12=(ImageView) findViewById(R.id.ImageView12);	               
	        final ImageView iv13=(ImageView) findViewById(R.id.imageView13);
	        final ImageView iv14=(ImageView) findViewById(R.id.imageView14);
	        final ImageView iv15=(ImageView) findViewById(R.id.imageView15);
	        final ImageView iv16=(ImageView) findViewById(R.id.imageView16);
	        final ImageView iv17=(ImageView) findViewById(R.id.imageView17);
	        final ImageView iv18=(ImageView) findViewById(R.id.ImageView18);	               
	        final ImageView iv19=(ImageView) findViewById(R.id.imageView19);
	        final ImageView iv20=(ImageView) findViewById(R.id.imageView20);	               


	        Button bl=(Button) findViewById(R.id.button1);
	        bl.setOnClickListener(new OnClickListener() {

				@Override
				public void onClick(View arg0) {		

					Animation animzoomtext=AnimationUtils.loadAnimation(Tutorialnumber.this, R.anim.zoomtext);
			        tv1.setAnimation(animzoomtext);
			        if(number<1)
					{
						number=21;
					}
					number--;

			        number--;
			        tv1.setText(""+number);
					/*switch (number) {
					case 1:
						iv1.setVisibility(iv1.INVISIBLE);
						break;
					case 2:
						iv1.setVisibility(iv1.INVISIBLE);
						iv2.setVisibility(iv2.INVISIBLE);
						break;
					case 3:
						iv1.setVisibility(iv1.INVISIBLE);
						iv2.setVisibility(iv2.INVISIBLE);
						iv3.setVisibility(iv3.INVISIBLE);
						break;
					default:
						break;
					}*/

				}
			});

	        final Button br=(Button) findViewById(R.id.button3);
	        br.setOnClickListener(new OnClickListener() {

				@Override
				public void onClick(View arg0) {

					Animation animzoomtext=AnimationUtils.loadAnimation(Tutorialnumber.this, R.anim.zoomtext);
			        tv1.setAnimation(animzoomtext);
					if(number>=20)
					{					
						number=-1;						
					}
					number++;

			        tv1.setText(""+number);
					switch (number) {
					/*case 0:
						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.INVISIBLE);
						iv5.setVisibility(View.INVISIBLE);
						iv6.setVisibility(View.INVISIBLE);
						iv7.setVisibility(View.INVISIBLE);
						iv8.setVisibility(View.INVISIBLE);
						iv9.setVisibility(View.INVISIBLE);
						iv10.setVisibility(View.INVISIBLE);
						iv11.setVisibility(View.INVISIBLE);
						iv12.setVisibility(View.INVISIBLE);
						iv13.setVisibility(View.INVISIBLE);
						iv14.setVisibility(View.INVISIBLE);
						iv15.setVisibility(View.INVISIBLE);
						iv16.setVisibility(View.INVISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						break;*/
					case 1:

						iv11.setVisibility(View.VISIBLE);

						MediaPlayer.create(Tutorialnumber.this,R.raw.en_1);
						mp.start();
						break;
					case 2:

						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);

						MediaPlayer.create(Tutorialnumber.this,R.raw.en_2);
						mp.start();
						break;
					case 3:

						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);


						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 4:
						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.INVISIBLE);
						iv5.setVisibility(View.INVISIBLE);
						iv6.setVisibility(View.INVISIBLE);
						iv7.setVisibility(View.INVISIBLE);
						iv8.setVisibility(View.INVISIBLE);
						iv9.setVisibility(View.INVISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.INVISIBLE);
						iv15.setVisibility(View.INVISIBLE);
						iv16.setVisibility(View.INVISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 5:
						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.INVISIBLE);
						iv5.setVisibility(View.INVISIBLE);
						iv6.setVisibility(View.INVISIBLE);
						iv7.setVisibility(View.INVISIBLE);
						iv8.setVisibility(View.INVISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.INVISIBLE);
						iv15.setVisibility(View.INVISIBLE);
						iv16.setVisibility(View.INVISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 6:
						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.INVISIBLE);
						iv5.setVisibility(View.INVISIBLE);
						iv6.setVisibility(View.INVISIBLE);
						iv7.setVisibility(View.INVISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.INVISIBLE);
						iv15.setVisibility(View.INVISIBLE);
						iv16.setVisibility(View.INVISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 7:iv1.setVisibility(View.INVISIBLE);
					iv2.setVisibility(View.INVISIBLE);
					iv3.setVisibility(View.INVISIBLE);
					iv4.setVisibility(View.INVISIBLE);
					iv5.setVisibility(View.INVISIBLE);
					iv6.setVisibility(View.INVISIBLE);
					iv7.setVisibility(View.INVISIBLE);
					iv8.setVisibility(View.VISIBLE);
					iv9.setVisibility(View.VISIBLE);
					iv10.setVisibility(View.VISIBLE);
					iv11.setVisibility(View.VISIBLE);
					iv12.setVisibility(View.VISIBLE);
					iv13.setVisibility(View.VISIBLE);
					iv14.setVisibility(View.VISIBLE);
					iv15.setVisibility(View.INVISIBLE);
					iv16.setVisibility(View.INVISIBLE);
					iv17.setVisibility(View.INVISIBLE);
					iv18.setVisibility(View.INVISIBLE);
					iv19.setVisibility(View.INVISIBLE);
					iv20.setVisibility(View.INVISIBLE);MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 8:
						iv1.setVisibility(View.INVISIBLE);
					iv2.setVisibility(View.INVISIBLE);
					iv3.setVisibility(View.INVISIBLE);
					iv4.setVisibility(View.INVISIBLE);
					iv5.setVisibility(View.INVISIBLE);
					iv6.setVisibility(View.INVISIBLE);
					iv7.setVisibility(View.VISIBLE);
					iv8.setVisibility(View.VISIBLE);
					iv9.setVisibility(View.VISIBLE);
					iv10.setVisibility(View.VISIBLE);
					iv11.setVisibility(View.VISIBLE);
					iv12.setVisibility(View.VISIBLE);
					iv13.setVisibility(View.VISIBLE);
					iv14.setVisibility(View.VISIBLE);
					iv15.setVisibility(View.INVISIBLE);
					iv16.setVisibility(View.INVISIBLE);
					iv17.setVisibility(View.INVISIBLE);
					iv18.setVisibility(View.INVISIBLE);
					iv19.setVisibility(View.INVISIBLE);
					iv20.setVisibility(View.INVISIBLE);MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 9:
						iv1.setVisibility(View.INVISIBLE);
					iv2.setVisibility(View.INVISIBLE);
					iv3.setVisibility(View.INVISIBLE);
					iv4.setVisibility(View.INVISIBLE);
					iv5.setVisibility(View.INVISIBLE);
					iv6.setVisibility(View.INVISIBLE);
					iv7.setVisibility(View.VISIBLE);
					iv8.setVisibility(View.VISIBLE);
					iv9.setVisibility(View.VISIBLE);
					iv10.setVisibility(View.VISIBLE);
					iv11.setVisibility(View.VISIBLE);
					iv12.setVisibility(View.VISIBLE);
					iv13.setVisibility(View.VISIBLE);
					iv14.setVisibility(View.VISIBLE);
					iv15.setVisibility(View.VISIBLE);
					iv16.setVisibility(View.INVISIBLE);
					iv17.setVisibility(View.INVISIBLE);
					iv18.setVisibility(View.INVISIBLE);
					iv19.setVisibility(View.INVISIBLE);
					iv20.setVisibility(View.INVISIBLE);MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 10:
						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.INVISIBLE);
						iv5.setVisibility(View.INVISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.INVISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 11:
						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.INVISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.INVISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 12:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.INVISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 13:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.INVISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 14:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.INVISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.VISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 15:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.VISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.VISIBLE);
						iv18.setVisibility(View.INVISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 16:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.INVISIBLE);
						iv3.setVisibility(View.VISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.VISIBLE);
						iv18.setVisibility(View.VISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 17:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.VISIBLE);
						iv3.setVisibility(View.VISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.VISIBLE);
						iv18.setVisibility(View.VISIBLE);
						iv19.setVisibility(View.INVISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 18:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.VISIBLE);
						iv3.setVisibility(View.VISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.VISIBLE);
						iv18.setVisibility(View.VISIBLE);
						iv19.setVisibility(View.VISIBLE);
						iv20.setVisibility(View.INVISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 19:

						iv1.setVisibility(View.INVISIBLE);
						iv2.setVisibility(View.VISIBLE);
						iv3.setVisibility(View.VISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.VISIBLE);
						iv18.setVisibility(View.VISIBLE);
						iv19.setVisibility(View.VISIBLE);
						iv20.setVisibility(View.VISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;
					case 20:

						iv1.setVisibility(View.VISIBLE);
						iv2.setVisibility(View.VISIBLE);
						iv3.setVisibility(View.VISIBLE);
						iv4.setVisibility(View.VISIBLE);
						iv5.setVisibility(View.VISIBLE);
						iv6.setVisibility(View.VISIBLE);
						iv7.setVisibility(View.VISIBLE);
						iv8.setVisibility(View.VISIBLE);
						iv9.setVisibility(View.VISIBLE);
						iv10.setVisibility(View.VISIBLE);
						iv11.setVisibility(View.VISIBLE);
						iv12.setVisibility(View.VISIBLE);
						iv13.setVisibility(View.VISIBLE);
						iv14.setVisibility(View.VISIBLE);
						iv15.setVisibility(View.VISIBLE);
						iv16.setVisibility(View.VISIBLE);
						iv17.setVisibility(View.VISIBLE);
						iv18.setVisibility(View.VISIBLE);
						iv19.setVisibility(View.VISIBLE);
						iv20.setVisibility(View.VISIBLE);
						MediaPlayer.create(Tutorialnumber.this,R.raw.en_3);
						mp.start();
						break;

					default:
						break;
						}
					}			
			});        
	        	}
}

مشکل دومم اینه که یه عدد رندوم تولید کردم و به اندازه اون تعداد گل هایی رو نشون میدم و در قسمت پایین هم چهار گزینه دارم که جواب من تو یکی از اون هاست حالا چیکار بکنم که وقتی گزینه ی درست انتخاب شد مثلا یک عملی انجام بشه مثل تغییر background عکس. این کار بفکرم رسید ولی کار نمیکنه شاید هم اشتباه باشه کدشو پایین مینویسم خیلی ممنون کمکم بکنید

String a=b1.gettext().tostring();
int x=Integer.parseint(a);
if (random==x){
    یک عملی
}