Android GridView - Update View by Position

Question

I have a GridView using a custom adapter (myAdapter extends BaseAdapter), where each element in the grid contains an ImageButton. getView () is working fine.

However, from other places in my code, how can I update the image (setImageResource) for one specific element in the grid depending on its position in the GridView?

So far, I have added this to my adapter class:

public void changeImage() { Log.d(TAG, "Image change"); this.ImageButton.setImageResource(R.drawable.newImage); } 

And I would like to write something like this: mygridview.getItemIdAtPosition(20).changeImage(); (not compiled).

Answer 1

If you want to update the image for one specific element in the grid, what you can do is ... have onClickListener for all the images in the grid.

Now, when u clicks on any image, find the position of the image and change the original cheers resource for that particular image.

Example:

When adding an image: imageView.setOnClickListener (imageListener);

And the listener will look like dis:

 private OnClickListener imageListener = new OnClickListener() { public void onClick(View v) { int id = v.getId(); ImageView imgView = imageArray.get(id); imgView .setBackgroundResource(R.drawable.newImage); }; 

I hope you will like it.

Answer 2

In the case of images in the GridView, I did this and it also works:

 gridview.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View imgView, int position, long id) { ImageView imageView = (ImageView) imgView; imageView.setImageResource(R.drawable.newImage); } }); } 

Answer 3

This is also my last problem. Here is my solution. I use the data Model and adapter for my RecyclerView First, register your new data in your model

  DataModel detail = new DataModel(id, name, sat, image); 

use set to replace the old value with the new

  mData.set(index, detail); 

finally upgrade your adapter

  if(adapter!=null) adapter.notifyItemChanged(index);