Web服务同步后ListView不更新

时间:2015-02-27 22:22:23

标签: android android-listview android-listfragment android-syncadapter android-webservice

我已经强制SyncAdapter调用webservice并插入/更新数据库。我想在ListView中展示一些此类数据,因此我实施了ListFragment,数据通过CursorAdapter显示。一切正常,除非我从网上获取新数据并将其插入数据库,CursorAdapter未更新,新数据未显示在ListView

在我的ContentProvider中,在每次插入后,我都会调用context.getContentResolver().notifyChange(uri, null);

这是实现适配器

ListFragment部分
mAdapter = new ObavijestiAdapter(getActivity(), null, 0);
setListAdapter(mAdapter);

这是我的自定义适配器

public class ObavijestiAdapter extends CursorAdapter {
private Cursor mCursor;
private Context mContext;
private final LayoutInflater mInflater;

static class ViewHolder {
    public TextView hTextNaslov;
    public TextView hTextOpis;
    public ImageView hImage;
}
public ObavijestiAdapter(Context context, Cursor c, int flags) {
    super(context, c, flags);
    mInflater = LayoutInflater.from(context);
    mContext = context;
}

@Override
public void bindView(View view, Context context, Cursor cursor) {
    final ViewHolder holder = (ViewHolder)view.getTag();

    //TODO: REMOVE AFTER IMPLEMENTING REAL IMAGE
    int w = 24, h = 24;
    Bitmap.Config conf = Bitmap.Config.ARGB_8888; // see other conf types
    Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
    //END REMOVE

    holder.hImage.setImageBitmap(bmp);
    holder.hTextNaslov.setText(cursor.getString(cursor.getColumnIndex(DataContract.Obavijesti.OBAVIJESTI_NASLOV)));
    holder.hTextOpis.setText(cursor.getString(cursor.getColumnIndex(DataContract.Obavijesti.OBAVIJESTI_OPIS)));

}


@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
    View view=mInflater.inflate(R.layout.fragment_obavijesti_row,parent,false);

    final ViewHolder holder = new ViewHolder();
    holder.hTextOpis = (TextView) view.findViewById(R.id.obOpis);
    holder.hTextNaslov = (TextView) view.findViewById(R.id.obNaslov);
    holder.hImage = (ImageView) view.findViewById(R.id.oblist_image);
    view.setTag(holder);
    return view;
}

有人能帮助我吗?

2 个答案:

答案 0 :(得分:2)

我终于开始工作了。因此,对于任何尝试执行类似操作的人,您必须在cursor.setNotificationUri(getContext().getContentResolver(), uri); .query之后加入ContentProvider。就是这样......

但是,如果您像我一样并且正在从Web服务接收数据,请记住不要将.notifyDataSetChanged()放在ContentProvider .update/.insert/.delete上,而是放在SyncAdapter中调用此方法的适配器上。在我的例子中

mContentResolver.applyBatch(ScheduleContract.CONTENT_AUTHORITY, batch);
mContentResolver.notifyChange(DataContract.Obavijesti.CONTENT_URI, null);

我希望,对某些人来说,这会有所帮助

答案 1 :(得分:-1)

尝试在更新信息后使您正在使用的视图无效。

listview.invalidate();