Android update custom XML imageView by id

Question

I am very new to Android. I am working with a list view which uses a custom list_v.xml to house x2 textviews. I have also included a imageView which I would like to update through the activity.

<?xml version="1.0" encoding="utf-8"?>

<ImageView
    android:id="@+id/icon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />


<TextView
    android:id="@+id/title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="24sp"
    android:maxHeight="40sp"
    android:textColor="#FFFFFF" />

<TextView
    android:id="@+id/body"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="24sp"
    android:maxHeight="35sp"
    android:textColor="#FFFFFF" />

I have updated the textviews via Json using this simple adapter concept but I would like to set the imageView for each row the same. I could hardcode the drawable to the xml above but I would like to reuse this view and update the image for other views if that makes sense.

Heres my activity class where I update the textViews but how do I programatically update the imageView to use the same image for all rows.

The imageView src will not come from my Json request it will be a drawable in the package.

@Override
    protected void onPostExecute(JSONArray json) {
        pDialog.dismiss();


        try {

            // Getting JSON Array from URL
            for(int i = 0; i < json.length(); i++){
                JSONObject c = json.getJSONObject(i);

                // Storing  JSON item in a Variable
                String cat = "Category: " + c.getString(TAG_Cat);
                String title = c.getString(TAG_Title);

                // Adding value HashMap key => value
                HashMap<String, String> map = new HashMap<String, String>();

                map.put(TAG_Cat, cat);
                map.put(TAG_Title, title);

                oslist.add(map);
                listView = (ListView)findViewById(R.id.listView);


                ListAdapter adapter = new SimpleAdapter(TopTipsActivity.this, oslist,
                        R.layout.list_v,
                        new String[] { TAG_Cat,TAG_Title},
                        new int[] {R.id.title,R.id.body});

                listView.setAdapter(adapter);
                listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> parent, View view,
                                            int position, long id) {
                        Toast.makeText(TopTipsActivity.this, "You Clicked at "+oslist.get(+position).get("Title"), Toast.LENGTH_SHORT).show();

                    }
                });

            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

I have tried to use

 ImageView image = (ImageView) listView.findViewById(R.id.icon);
 image.setBackgroundResource(R.drawable.tip_selected);

I am guessing I somehow need to reference list_v not listView.findViewById. I am probably missing the point completely.

Answer 1

That's so simple, just edit your HashMap to

HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_Cat, cat);
map.put(TAG_Title, title);
// the following line will add the default image to your map
map.put("Image", String.valueOf(R.drawable.ic_launcher));

and edit the SimpleAdapter to

ListAdapter adapter = new SimpleAdapter(TopTipsActivity.this, oslist,
                    R.layout.list_v,
                    new String[] { TAG_Cat, TAG_Title, "Image"},
                    new int[] {R.id.title, R.id.body, R.id.icon});