ArrayAdapter text and image

All we need is a simple explanation of the problem, which is provided below.

In my activity I implement a list which contains the names of some files.
Every list’s item refers to a layout in which I’d like to show the name of the images and a thumbnail of the image referenced. Ican show the the name using an ArrayAdapter but i don’t know hot to insert the image thumbnail.
All the image referenced stay in sd_card and i have the path of they.
Here is the single row layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:orientation="horizontal" >

<ImageView
    android:id="@+id/imageView"
    android:layout_width="36dp"
    android:layout_height="wrap_content"
    android:src="@drawable/btn_nav_background_default" />

<TextView
    android:id="@+id/titoloTv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>

and the layout of the activity

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

<Button
    android:id="@+id/creaButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="Crea una nuova realtà aumentata" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="Ar già create"
    android:textAppearance="?android:attr/textAppearanceLarge" />

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >


</ListView>

</LinearLayout>

and the activity code inherent adapter.

    ArrayAdapter<?> arrayAdapter = new ArrayAdapter<String>(this,R.layout.row,R.id.titoloTv,targetName);
    listView.setAdapter(arrayAdapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {  
           @Override  
           public void onItemClick(AdapterView<?> adapter, final View componente, int pos, long id){

...................            
           } 

    }); 

I’m trying using this but doesn’t work properly.

    String tempTarget;
    List<Map<String,Object>> data = new ArrayList<Map<String,Object>>();

   for(int i = 0; i<ARelements.size();i++){
        Element ar = arIterator.next();

        Map<String,Object> map = new HashMap<String,Object>(2);
        tempTarget = ar.getAttributeValue("TARGET");
        thumbnailBitmap = ThumbnailUtils.extractThumbnail(BitmapFactory.decodeFile(tempTarget), THUMBSIZE, THUMBSIZE);
        map.put("thumbnail", thumbnailBitmap);
        map.put("titolo", tempTarget);
        data.add(map);
    }
   arIterator= null;

   SimpleAdapter simpleAdapter = new SimpleAdapter(this,data,R.layout.row,new String[] {"thumbnail","titolo"},new int[] {R.id.imageView, R.id.titoloTv});


    listView.setAdapter(simpleAdapter);

Let’s Solve it:

This is a common error many developers questioned us about it. So we write the explanation above. You just have to apply the suggested solution to your code and it will do for you. If you still getting this error after applying this code then comment below we will get back to you with the new method.

Solution 1

You need to implement a custom array adapter and specify that imageview and textview layout/id(s) in the adapter.

Something like:

  public class CustomListViewAdapter extends ArrayAdapter<RowItem> {


    Context context;

    public CustomListViewAdapter(Context context, int resourceId, //resourceId=your layout
            List<RowItem> items) {
        super(context, resourceId, items);
        this.context = context;
    }

    /*private view holder class*/
    private class ViewHolder {
        ImageView imageView;
        TextView txtTitle;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        RowItem rowItem = getItem(position);

        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder();
            holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
            holder.imageView = (ImageView) convertView.findViewById(R.id.icon);
            convertView.setTag(holder);
        } else
            holder = (ViewHolder) convertView.getTag();

        holder.txtTitle.setText(rowItem.getTitle());
        holder.imageView.setImageResource(rowItem.getImageId());

        return convertView;
    }
}  

And then:

listView = (ListView) findViewById(R.id.list);
        CustomListViewAdapter adapter = new CustomListViewAdapter(this,
                R.layout.list_item, rowItems);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(this);
    }


@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {
    Toast toast = Toast.makeText(getApplicationContext(),
        "Item " + (position + 1) + ": " + rowItems.get(position),
        Toast.LENGTH_SHORT);
    toast.show();
}  

Refer Extending other Adapters too, for ListView(s) and their custom implementation:
Eg.
http://theopentutorials.com/tutorials/android/listview/android-custom-listview-with-image-and-text-using-arrayadapter/

Solution 2

You don’t necessarily need a custom ArrayAdapter, a SimpleAdapter will do the trick for a thumbnail/text combo. You can store the path to the thumbnail and the text you want in a HashMap array, and then apply it using a SimpleAdapter. For example, if you had 5 thumbnails + text and arrays of each:

List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
for (int i = 0; i < 5; i++) {
            Map<String, Object> datum = new HashMap<String, Object>(2);
            datum.put("thumbnail", thumbnail[i]);
            datum.put("name", text[i]);
            data.add(datum);
        }
YourListViewId.setAdapter(new SimpleAdapter(this, data, R.layout.yoursinglerowlayout, new String[] {"thumbnail","name"}, new int[] {R.id.imageView, R.id.titoloTv}));

Solution 3

First: You will have to change your ArrayAdapter to BaseAdapter because BaseAdapter gives you more flexibility with the views. Try to use this code and see how it works:

Here’s how I am getting images from sd card and populating it in a listview

public class GetSdCardContent extends Activity {

    public static Cursor cursor;
    private int columnIndex;
    private File file;
    private String SD_CARD_ROOT;
    ArrayList<String> f = new ArrayList<String>(); 
    File[] listFile;
    ImageAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.sdcard_layout);


        getSdcardImages();


        ListView lv1 = (ListView) findViewById(R.id.sdlistView1);
        adapter = new ImageAdapter();
        lv1.setAdapter(adapter);

    }


    public void getSdcardImages() {
        File file = new File(
                android.os.Environment.getExternalStorageDirectory().getPath(),
                "Pictures");


        if (file.isDirectory()) {
            listFile = file.listFiles();

            for (int i = 0; i < listFile.length; i++) {

                f.add(listFile[i].getAbsolutePath());
                Log.i("FILES:"+"---", f.toString());

            }
        }
    }

This is the adapter I am using. It’s a base adapter and I am getting only images for now. You can also add your TextView if you want to.

    public class ImageAdapter extends BaseAdapter {
        private LayoutInflater mInflater;

        public ImageAdapter() {
            mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        public int getCount() {
            return f.size();
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.custom_listview_items,
                        null);
                holder.imageview = (ImageView) convertView
                        .findViewById(R.id.customimageView1);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            Bitmap myBitmap = BitmapFactory.decodeFile(f.get(position));
            try {

                holder.imageview.setImageBitmap(getResizedBitmap(myBitmap, 300, 300));
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return convertView;
        }
    }

This method is for bitmap. If you want to resize your image and stuff.

    public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
        int width = bm.getWidth();
        int height = bm.getHeight();
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // CREATE A MATRIX FOR THE MANIPULATION
        Matrix matrix = new Matrix();
        // RESIZE THE BIT MAP
        matrix.postScale(scaleWidth, scaleHeight);

        // "RECREATE" THE NEW BITMAP
        Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
        return resizedBitmap;
    }
    class ViewHolder {
        ImageView imageview;

    }
}

Last part: Two layouts.

One: layout for items.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/customimageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/bluebutton" />

</LinearLayout>

Second: Main Layout. (ListView)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

     <ListView
        android:id="@+id/sdlistView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView> 


</LinearLayout>

Hope this gives some help..:)

Solution 4

I’ve solved it using this class

public class ExtendedSimpleAdapter extends SimpleAdapter{
List<HashMap<String, Object>> map;
String[] from;
int layout;
int[] to;
Context context;
LayoutInflater mInflater;
public ExtendedSimpleAdapter(Context context, List<HashMap<String, Object>> data,
        int resource, String[] from, int[] to) {
    super(context, data, resource, from, to);
    layout = resource;
    map = data;
    this.from = from;
    this.to = to;
    this.context = context;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
return this.createViewFromResource(position, convertView, parent, layout);
}

private View createViewFromResource(int position, View convertView,
    ViewGroup parent, int resource) {
View v;
if (convertView == null) {
    v = mInflater.inflate(resource, parent, false);
} else {
    v = convertView;
}

this.bindView(position, v);

return v;
}


private void bindView(int position, View view) {
final Map dataSet = map.get(position);
if (dataSet == null) {
    return;
}

final ViewBinder binder = super.getViewBinder();
final int count = to.length;

for (int i = 0; i < count; i++) {
    final View v = view.findViewById(to[i]);
    if (v != null) {
        final Object data = dataSet.get(from[i]);
        String text = data == null ? "" : data.toString();
        if (text == null) {
            text = "";
        }

        boolean bound = false;
        if (binder != null) {
            bound = binder.setViewValue(v, data, text);
        }

        if (!bound) {
            if (v instanceof Checkable) {
                if (data instanceof Boolean) {
                    ((Checkable) v).setChecked((Boolean) data);
                } else if (v instanceof TextView) {
                    // Note: keep the instanceof TextView check at the bottom of these
                    // ifs since a lot of views are TextViews (e.g. CheckBoxes).
                    setViewText((TextView) v, text);
                } else {
                    throw new IllegalStateException(v.getClass().getName() +
                            " should be bound to a Boolean, not a " +
                            (data == null ? "<unknown type>" : data.getClass()));
                }
            } else if (v instanceof TextView) {
                // Note: keep the instanceof TextView check at the bottom of these
                // ifs since a lot of views are TextViews (e.g. CheckBoxes).
                setViewText((TextView) v, text);
            } else if (v instanceof ImageView) {
                if (data instanceof Integer) {
                    setViewImage((ImageView) v, (Integer)     data);                            
                } else if (data instanceof Bitmap){
                    setViewImage((ImageView) v, (Bitmap)data);
                } else {
                    setViewImage((ImageView) v, text);
                }
            } else {
                throw new IllegalStateException(v.getClass().getName() + " is not a " +
                        " view that can be bounds by this SimpleAdapter");
            }
        }
    }
}
}



private void setViewImage(ImageView v, Bitmap bmp){
v.setImageBitmap(bmp);
}



}

Note: You are free to use these solutions for your personal use. We recommend you apply the first solution to your code because it was tested in our system before posting it on this page.

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