I have an onScrollListener animation in my Kotlin project and I will like to use that code in my java as well, I have tired to convert the Kotlin code to Java but i am see some error and my app crashes when it detects the onScrollListener the animation hides a TextView
This is the Kotlin Code
class MainActivity : AppCompatActivity()
{
private lateinit var category_recycler: RecyclerView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var btnExtended = true
//animated scroll
var animator : ValueAnimator? = null
//the note onscroll listener
note_recycler.addOnScrollListener(object : RecyclerView.OnScrollListener(){
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
if (animator==null){
animator=createanimator()
}
if (dy>0 && btnExtended)
{
animator!!.start()
btnExtended = !btnExtended
}else if (dy<0 && !btnExtended){
animator!!.reverse()
btnExtended = !btnExtended
}
}
})
}
private fun createanimator(): ValueAnimator{
var textview = findViewById<TextView>(R.id.textview) //textview i want to hide
val initSize=textview.measuredWidth
val animator=ValueAnimator.ofInt(initSize,0)
animator.duration=250
animator.addUpdateListener { animation ->
val value = animation.animatedValue as Int
val layoutParams = textview.layoutParams //line 50
layoutParams.width = value
textview.requestLayout()
}
return animator
}
}
//So far this is the code i has converted to java
public class MainActivity extends AppCompatActivity implements NoteListener {
private RecyclerView note_recycler;
private ValueAnimator animator = null;
private Boolean btnExtended;
private TextView textview;
private LinearLayout.LayoutParams layoutParams;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnExtended = true;
note_recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if(animator==null){
animator=createanimator();
}
if (dy>0 && btnExtended)
{
if(animator!=null){
animator.start();
}
btnExtended = !btnExtended;
}
else if (dy<0 && !btnExtended){
if(animator!=null){
animator.reverse();
}
btnExtended = !btnExtended;
}
}
});
}
private ValueAnimator createanimator() {
textview = findViewById(R.id.textview);
int initSize = textview.getMeasuredWidth();
animator=ValueAnimator.ofInt(initSize,0);
animator.setDuration(250);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(@NonNull ValueAnimator animation) {
int value = (int) animation.getAnimatedValue();
//there is a missing line here named line 50 from the kotlin code, Please can you help me convert it and also cross check the other code for the java convertion
layoutParams.width =value;
textview.requestLayout();
}
});
return animator;
}
}
//Please I am new to kotlin and i am not sure if this java convertion is right please can you check through it and convert the line 50 i was unable to convert
