کمک در رابطه یه مقدار ار کدهام

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.show_step);
        
        
        
        Button nextImage = (Button)findViewById(R.id.btnNext);
        final TextView txt = (TextView)findViewById(R.id.textView1);
        final ImageSwitcher  imageSwitcher= (ImageSwitcher)findViewById(R.id.imageChanger);
        
        imageSwitcher.setFactory(new ImageSwitcher.ViewFactory() {
            
            @Override
            public View makeView() {
                ImageView imageView = new ImageView(getApplicationContext());
                imageView.setImageResource(imageNo[0]);
                imageView.setScaleType(ScaleType.FIT_CENTER);
                imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
                        ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams
                        .MATCH_PARENT));
                
                
                return imageView;
            }
        });
        txt.setText("مرحله : 1 / "+countImage);
        
        nextImage.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                
                currentImage ++;
                int set  = currentImage+1;

                if(currentImage==countImage)
                    currentImage = 0;
                
                
                    imageSwitcher.setImageResource(imageNo[currentImage]);
                    
                    
                    txt.setText("Step : "+set+" / "+countImage);
                    
                    
            }
        });
    }