我在 gridview 上使用光标适配器时遇到问题,我使用光标从媒体商店加载照片。我意识到我的 newView 和 bindView 被完全调用了。我的意思是假设我有 500 张照片, newView 也会被调用相同的次数。
我做错了什么吗?我认为只有当单元格在屏幕上可见时它才会调用。
public int taskA = 0;
public GalleryCursorAdapter(Context context, Cursor c) {
super(context, c);
// TODO Auto-generated constructor stub
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// TODO Auto-generated method stub
int index = cursor.getColumnIndex(MediaStore.Images.Media._ID);
long id = cursor.getLong(index);
Bundle idBundle = new Bundle();
idBundle.putLong("id", id);
Message msg = new Message();
msg.setData(idBundle);
ImageHandler imgHandler = new ImageHandler(context, (ImageView) view);
imgHandler.sendMessage(msg);
view.setTag(imgHandler);
Log.w("task s", " count");
}
@SuppressLint({ "NewApi", "NewApi" })
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// TODO Auto-generated method stub
int index = cursor.getColumnIndex(MediaStore.Images.Media._ID);
long id = cursor.getLong(index);
ImageView iView = new ImageView(context);
Bundle idBundle = new Bundle();
idBundle.putLong("id", id);
Message msg = new Message();
msg.setData(idBundle);
ImageHandler imgHandler = new ImageHandler(context, iView);
imgHandler.sendMessage(msg);
iView.setTag(imgHandler);
taskA++;
Log.w("task s", taskA+ " count");
return iView;
}
static class ImageHandler extends Handler {
private ImageView mView;
private Context mContext;
public ImageHandler(Context c, ImageView v) {
mView = v;
mContext = c;
}
@Override
public void handleMessage(Message msg) {
Bundle idBundle = msg.getData();
Long id = idBundle.getLong("id");
Bitmap image = MediaStore.Images.Thumbnails.getThumbnail(
mContext.getContentResolver(),
id,
MediaStore.Images.Thumbnails.MICRO_KIND,
new Options());
mView.setImageBitmap(image);
}
}