我有一个listview从Json的sql数据库中获取数据。
我想将其转换为动态列表视图，在滚动结束时，在加载更多项目并将其添加到适配器时（例如，每次10个项目），列表的页脚中会出现“加载更多项目”。我在实现此功能时遇到问题。请帮帮我。谢谢。
活动类：
public class MoreVideos extends ListActivity {
int i =1;
private int dateCode = 1;
private ListArrayAdapter listAdapter = null;
private ProgressDialog pDialog = null;
private String id;
@SuppressWarnings("unused")
ArrayList<videoDto> aryLists =null;
String getDate;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.more_video);
id=getIntent().getStringExtra("id");
pDialog = new ProgressDialog(getApplicationContext());
pDialog.setMessage("Loading....");
pDialog.setCancelable(true);
loadCategoriesAsync();
};
// TODO Auto-generated method stub
protected void loadCategoriesAsync() {
loadCategoriesTaskHandler task = new loadCategoriesTaskHandler();
if (Build.VERSION.SDK_INT >= 11)
{
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
else
{
task.execute();
}
}
class loadCategoriesTaskHandler extends AsyncTask<videoDto, Void, String>
{
@Override
protected String doInBackground(videoDto... params)
{
String results= "";
try
{
videoDto videodto=new videoDto();
// healthDto.getInfom(strEail.trim(),strPassword,getApplicationContext());
aryLists = new ArrayList<videoDto>();
aryLists= videodto.getvideo(id);
}
catch (Exception e)
{
e.printStackTrace();
}
return results;
}
@Override
protected void onPostExecute(String result)
{
super.onPostExecute(result);
if(aryLists!=null){
listAdapter = new ListArrayAdapter(getApplicationContext(), MoreVideos.this,
aryLists);
setListAdapter(listAdapter);
}else{
Toast.makeText(getApplicationContext(), "ArrayList is null ", Toast.LENGTH_SHORT).show();
}
}
}
适配器类：
public class ListArrayAdapter extends ArrayAdapter<videoDto> {
private final Context context;
private MoreVideos _parent;
public ListArrayAdapter(Context context, MoreVideos parent,
ArrayList<videoDto> aryLog) {
super(context, R.layout.video_listing, aryLog);
this.context = context;
this._parent = parent;
}
@SuppressLint("InflateParams")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflate = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflate.inflate(R.layout.video_listing,
null);
ViewHolder viewHolder = new ViewHolder();
viewHolder.index = (TextView) rowView
.findViewById(R.id.index);
viewHolder.NameOfVideo = (TextView) rowView
.findViewById(R.id.txt_name_video);
viewHolder.img = (ImageView) rowView
.findViewById(R.id.img_video);
viewHolder.rel= (RelativeLayout) rowView.findViewById(R.id.click);
viewHolder.bookv = (ImageView)rowView.findViewById(R.id.bookv);
//viewHolder.download = (ImageView)rowView.findViewById(R.id.download);
rowView.setTag(viewHolder);
rowView.setTag(viewHolder);
}
ViewHolder holder = (ViewHolder) rowView.getTag();
final videoDto userLog = (this._parent != null) ? this._parent.listAdapter
.getItem(position) : null;
String currentPosition = Integer.toString(position);
if (userLog != null) {
try {
try {
/* if(currentPosition.equals(""))
{
holder.index.setText("-----");
}
else
{
holder.index.setText(Integer.toString(Integer.parseInt(currentPosition) + 1));
}*/
holder.rel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String name =userLog.link ;
/*try {
MediaPlayer player = new MediaPlayer();
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.setDataSource("http://xty/MRESC/images/test/xy.mp3");
player.prepare();
player.start();
} catch (Exception e) {
// TODO: handle exception
}*/
//Log.v("String ", speaker.vid);
Intent mainIntent = new Intent(getApplicationContext(),VideoViewActivity.class);
mainIntent.putExtra("IMGNAME", name);
//Log.v("name",name);
// startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse(name)));
startActivity(mainIntent);
}
});
holder.bookv.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
// String jobId = (String) v.getTag();
String name =userLog.link ;
videoDto videodto = (videoDto) v.getTag();
Intent intentJobApplicants = new Intent(getApplicationContext(),VideoViewActivity.class);
intentJobApplicants.putExtra("IMGNAME",name);
// intentJobApplicants.putExtra("JobId", jobAp.id);
startActivity(intentJobApplicants);
}
});
if (userLog.VideoText.equals("")) {
holder.NameOfVideo.setText("-----");
} else {
holder.NameOfVideo.setText(userLog.VideoText);
}
i=i+1;
Log.v("i",String.valueOf(i));
} catch (Exception ex) {
// Toast.makeText(context, ex.getMessage(),
// Toast.LENGTH_SHORT).show();
}
if (position % 2 == 0) {
rowView.setBackgroundColor(Color.LTGRAY);
} else {
rowView.setBackgroundColor(Color.WHITE);
}
}catch(Exception ex){
ex.printStackTrace();
}
}
return rowView;
}
}
}
查看持有人类：
public static class ViewHolder {
protected TextView index;
protected ImageView bookv;
protected ImageView img;
protected ImageView download;
protected TextView NameOfVideo;
protected RelativeLayout rel;
}