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package pl.polidea.coverflow;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.util.Log;
/**
* This class is an adapter that provides images from a fixed set of resource
* ids. Bitmaps and ImageViews are kept as weak references so that they can be
* cleared by garbage collection when not needed.
*
*/
public class ResourceImageAdapter extends AbstractCoverFlowImageAdapter {
/** The Constant TAG. */
private static final String TAG = ResourceImageAdapter.class
.getSimpleName();
/** The Constant DEFAULT_LIST_SIZE. */
private static final int DEFAULT_LIST_SIZE = 20;
/** The Constant IMAGE_RESOURCE_IDS. */
private static final List<Integer> IMAGE_RESOURCE_IDS = new ArrayList<Integer>(
DEFAULT_LIST_SIZE);
/** The Constant DEFAULT_RESOURCE_LIST. */
private static final int[] DEFAULT_RESOURCE_LIST = {};
/** The bitmap map. */
private final Map<Integer, WeakReference<Bitmap>> bitmapMap = new HashMap<Integer, WeakReference<Bitmap>>();
private final Context context;
/**
* Creates the adapter with default set of resource images.
*
* @param context
* context
*/
public ResourceImageAdapter(final Context context) {
super();
this.context = context;
setResources(DEFAULT_RESOURCE_LIST);
}
/**
* Replaces resources with those specified.
*
* @param resourceIds
* array of ids of resources.
*/
public final synchronized void setResources(final int[] resourceIds) {
IMAGE_RESOURCE_IDS.clear();
for (final int resourceId : resourceIds) {
IMAGE_RESOURCE_IDS.add(resourceId);
}
notifyDataSetChanged();
}
/*
* (non-Javadoc)
*
* @see android.widget.Adapter#getCount()
*/
@Override
public synchronized int getCount() {
return IMAGE_RESOURCE_IDS.size();
}
/*
* (non-Javadoc)
*
* @see pl.polidea.coverflow.AbstractCoverFlowImageAdapter#createBitmap(int)
*/
@Override
protected Bitmap createBitmap(final int position) {
Log.v(TAG, "creating item " + position);
final Bitmap bitmap = ((BitmapDrawable) context.getResources()
.getDrawable(IMAGE_RESOURCE_IDS.get(position)))
.getBitmap();
bitmapMap.put(position, new WeakReference<Bitmap>(bitmap));
return bitmap;
}
}
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