Display image thumbnail OnItemClickListener

Question

I'm new to this android apps development and currently, I'm creating an app that will get an image uri from the gallery to the listview on my activity. I have no problem with that. I just want to add a feature that when I clicked an image uri from my listview, a bitmap thumbnail of that image uri will appear. Here is my code:

     ListView lv;
 ArrayList<Uri> array_list = new ArrayList<Uri>();
 ArrayAdapter<Uri> array_adapter;

 final int RQS_LOADIMAGE = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    array_adapter = new ArrayAdapter<Uri>(MainActivity.this, android.R.layout.simple_list_item_1, array_list);
    lv = (ListView)findViewById(R.id.list);
    lv.setAdapter(array_adapter);

}

    public void btn_ai(View view) {
       Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
       startActivityForResult(intent, RQS_LOADIMAGE);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == RESULT_OK){

            switch(requestCode){

            case RQS_LOADIMAGE:
                Uri imageUri = data.getData();
                array_list.add(imageUri);
                array_adapter.notifyDataSetChanged();
                break; 
            }
        }
    }

}

Answer 1

First you need to set up a ViewHolder like this: How to implement a view holder?

Follow that example and you then set up OnClickListener using the ViewHolder and wallah. You can then set you method() to launch a new activity with the Bitmap etc.

EDIT: It is better to use a CustomAdapter as this will allow ViewHolder to be implemented. See these:

http://www.vogella.com/articles/AndroidListView/article.html#androidlists_adapterintro http://developer.android.com/reference/android/widget/Adapter.html