Hello, I'm testing some code from a demo found in a forum and I'm
getting some strange results. My goal is to be able to allow users to
access the pictures on their device to choose an avatar/logo. This
code run flawlessly except that I only get a handful of images on the
phone. And its not even always the same images. Whats more is that
it loads those images into a gridview and repeats them for what looks
like a number of times equal to the actual number of images that are
on the device. And on top of that if I scroll down the through the
pictures, and scroll back up, it reorders the pictures from what they
were previously. Each time I load the app the pictures seem to be
different as well. I have around 400 pictures stored on my phone, and
thats what I'm using to test. If someone could shed some light on
this for me that would be great. This is my first time using a URI to
access content to I'm not sure where to start troubleshooting this
one.
public class gallery extends Activity {
/**
* Cursor used to access the results from querying for images on
the SD card.
*/
private Cursor cursor;
/*
* Column index for the Thumbnails Image IDs.
*/
private int columnIndex;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery);
// Set up an array of the Thumbnail Image ID column we want
String[] projection = {MediaStore.Images.Thumbnails._ID};
// Create the cursor pointing to the SDCard
cursor = managedQuery
( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null,
MediaStore.Images.Thumbnails.IMAGE_ID);
// Get the column index of the Thumbnails Image ID
columnIndex = cursor.getColumnIndexOrThrow
(MediaStore.Images.Thumbnails._ID);
GridView sdcardImages = (GridView) findViewById(R.id.sdcard);
sdcardImages.setAdapter(new ImageAdapter(this));
// Set up a click listener
sdcardImages.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView parent, View v, int
position, long id) {
// Get the data location of the image
String[] projection = {MediaStore.Images.Media.DATA};
cursor = managedQuery
( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null,
null);
columnIndex = cursor.getColumnIndexOrThrow
(MediaStore.Images.Media.DATA);
cursor.moveToPosition(position);
// Get image filename
String imagePath = cursor.getString(columnIndex);
// Use this path to do further processing, i.e. full
screen display
}
});
}
/**
* Adapter for our image files.
*/
private class ImageAdapter extends BaseAdapter {
private Context context;
public ImageAdapter(Context localContext) {
context = localContext;
}
public int getCount() {
return cursor.getCount();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup
parent) {
ImageView picturesView;
if (convertView == null) {
picturesView = new ImageView(context);
// Move cursor to current position
cursor.moveToPosition(position);
// Get the current value for the requested column
int imageID = cursor.getInt(columnIndex);
// Set the content of the image based on the provided
URI
picturesView.setImageURI(Uri.withAppendedPath(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID));
picturesView.setScaleType
(ImageView.ScaleType.FIT_CENTER);
picturesView.setPadding(8, 8, 8, 8);
picturesView.setLayoutParams(new GridView.LayoutParams
(100, 100));
}
else {
picturesView = (ImageView)convertView;
}
return picturesView;
}
}
}
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