如何在我的活动中获取 viewpager 数据 android java

Question

How can I get viewpager data in my activity android java

I want the viewpager's current page data in my activity

my activity

 ViewPager2 locationViewPager = findViewById(R.id.locationViewPager);
    ImageView next = findViewById(R.id.next);
    ImageView back = findViewById(R.id.back);
     genres = findViewById(R.id.textView1);
     source = findViewById(R.id.textView2);


    List<TravelLocation> travelLocations = new ArrayList<>();


    for (int i=0;i<=1000;i++){
        TravelLocation travelLocationMV = new TravelLocation();
        travelLocationMV.imageUrl = R.drawable.cardimage;
        travelLocationMV.genres = "Thriller";
        travelLocationMV.source = "Netflix";
        travelLocations.add(travelLocationMV);
    }

    TravelLocationAdapter travelLocationAdapter = new TravelLocationAdapter(travelLocations);


    locationViewPager.setAdapter(travelLocationAdapter);

    locationViewPager.setClipToPadding(false);
    locationViewPager.setClipChildren(false);
    locationViewPager.setOffscreenPageLimit(3);
    locationViewPager.getChildAt(0).setOverScrollMode(RecyclerView.OVER_SCROLL_NEVER);



    CompositePageTransformer compositePageTransformer = new CompositePageTransformer();
    compositePageTransformer.addTransformer(new MarginPageTransformer(40));
    compositePageTransformer.addTransformer((page, position) -> {
        float r = 1 - Math.abs(position);
        page.setScaleY(0.90f + r * 0.04f);
    });

    locationViewPager.setPageTransformer(compositePageTransformer);

my adapter

class TravelLocationAdapter extends RecyclerView.Adapter<TravelLocationAdapter.TravelLocationViewHolder>{

private List<TravelLocation> travelLocations;

public TravelLocationAdapter(List<TravelLocation> travelLocations) {
    this.travelLocations = travelLocations;
}

@NonNull
@Override
public TravelLocationViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    return new TravelLocationViewHolder(
            LayoutInflater.from(parent.getContext()).inflate(
                    R.layout.cardlayout,
                    parent, false
            )
    );
}
@Override
public void onBindViewHolder(@NonNull TravelLocationViewHolder holder, int position) {
    holder.setLocationData(travelLocations.get(position));
    holder.kbvLocation.setOnClickListener(view -> {
    });
}
@Override
public int getItemCount() {
    return travelLocations.size();
}

static class TravelLocationViewHolder extends RecyclerView.ViewHolder {

    private ImageView kbvLocation;


    TravelLocationViewHolder(@NonNull View itemView) {
        super(itemView);
        kbvLocation = itemView.findViewById(R.id.kbvLocation);
    }
    void setLocationData(TravelLocation travelLocation){
        Picasso.get().load(travelLocation.imageUrl).into(kbvLocation);
    }
}

}

my data class

class TravelLocation {
public int  imageUrl;
public String genres,source; }

I want to access the other two text view in main activity

how can I set TextView 's text in my activity

how can the other two fields get in activity

I want to set this field in activity

Answer 1

You can create another function inside of TravelLocationAdapter which accepts a value that you want the textview to have. This way code remains in adapter and you can call it and pass value to it from main activity. The function can even return the values.