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);


}
});
}