我使用了这个库：https://github.com/johannilsson/android-pulltorefresh
运行良好，但在ListView简单（简单就是我在单元格android的模式中所说的）。
我在自定义ListView中放置了一个Adpter，用于包含图像，标题和描述的单元格。
我的班级与adpter：
public class extends Main_podcast ListActivity implements {OnItemClickListener
private Bitmap pathImgSmal;
/ ** Called When the activity is first created. * /
@ Override
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
Mybundle bundle = new Bundle ();
mybundle.putString ("podcastnumber", "0");
/ / Check for connection and starts downloading the XML
Connected conected Boolean = (this);
if (conected == true) {
DoInBackground new (). execute ();
Else {}
new AlertDialog.Builder (Main_podcast.this)
. SetTitle ("Alert!")
. SetMessage ("Unable to connect to the Internet," +
"Check your network or try again later.")
. SetNeutralButton ("OK"
new DialogInterface.OnClickListener () {
public void onClick (DialogInterface dialog,
int which) {}
}). Show ();
}
}
/ / Method calls the XML Parser
public void do_update ()
{
PodcastParser.parse ();
}
/ / Method that populates the list view with XML parameters
public void populate_listview ()
{
List <Itens> podcastList <Itens> = new ArrayList ();
for (int i = 0; i <arraysPodcast.PodcastTitle.length; i + +) {
end item Items = new Items ();
item.setTitle (arraysPodcast.PodcastTitle [i]);
item.setData (arraysPodcast.PodcastData [i]);
item.setImage (arraysPodcast.ArrayIMGPodcast [i]);
podcastList.add (item);
}
setListAdapter (new PodcastAdapter (this, podcastList));
ListView shot getListView = ();
shot.setOnItemClickListener ((OnItemClickListener) this);
}
public void onItemClick (AdapterView <?> arg0, View v, int position, long id) {
/ / Start the Activity podcast regarding your number from the list
Myintent intent = new Intent ("com.example.player.PODCAST");
Mybundle bundle = new Bundle ();
mybundle.putInt ("podcastnumber" position);
myintent.putExtras (mybundle);
startActivity (myintent);
}
private class extends DoInBackground AsyncTask <Void, Void, Void>
implements DialogInterface.OnCancelListener
{
ProgressDialog private dialog;
protected void OnPreExecute ()
{
dialog = ProgressDialog.show (Main_podcast.this, "", "Loading Podcasts ...", true);
}
protected void doInBackground (Void. unused ..)
{
do_update ();
return null;
}
OnPostExecute protected void (Void unused)
{
dialog.dismiss ();
populate_listview ();
}
public void onCancel (DialogInterface dialog)
{
cancel (true);
dialog.dismiss ();
}
}
public static boolean Connected (Context context) {
try {
= ConnectivityManager cm (ConnectivityManager)
context.getSystemService (Context.CONNECTIVITY_SERVICE);
LogSync String = null;
LogToUserTitle String = null;
if (cm.getNetworkInfo (ConnectivityManager.TYPE_MOBILE). isConnected ()) {
LogSync + = "\ nConectado 3G Internet";
LogToUserTitle + = "Connected to 3G Internet";
return true;
} Else if (cm.getNetworkInfo (ConnectivityManager.TYPE_WIFI). IsConnected ()) {
LogSync + = "\ nConectado WIFI Internet";
LogToUserTitle + = "Connected to Wireless Internet";
return true;
Else {}
LogSync + = "\ nYou have internet connection";
LogToUserTitle + = "Do not have an internet connection";
return false;
}
} Catch (Exception e) {
return false;
}
}
} / / Class
问题是，如何使用自定义单元库johannilsson实现我的类？
欢迎任何帮助！
答案 0 :(得分：0)
决定如下：
public class PullToRefreshActivity extends ListActivity implements OnItemClickListener {
private LinkedList<String> mListItems;
private List<Itens> podcastList;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pull_to_refresh);
// Set a listener to be invoked when the list should be refreshed.
// ======================================================
Bundle mybundle = new Bundle();
mybundle.putString("podcastnumber", "0");
//verifica se há conexao e inicia download do XML
Boolean conected = Conectado(this);
if(conected == true){
new DoInBackground().execute();
}else{
new AlertDialog.Builder(PullToRefreshActivity.this)
.setTitle("Alerta!")
.setMessage("Não foi possível estabelecer uma conexão com a Internet," +
"verifique sua rede ou tente novamente mais tarde.")
.setNeutralButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {}
}).show();
}
// ======================================================
((PullToRefreshListView) getListView()).setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh() {
// Do work to refresh the list here.
new DoInBackground().execute();
}
});
}
// ==================================================================
public void do_update()
{
PodcastParser.parse();
}
//metodo que preenche a list view com parametros do XML
public void populate_listview()
{
podcastList = new ArrayList<Itens>();
for (int i = 0; i < arraysPodcast.PodcastTitle.length; i++) {
final Itens item = new Itens();
item.setTitle(arraysPodcast.PodcastTitle[i]);
item.setData(arraysPodcast.PodcastData[i]);
item.setImage(arraysPodcast.ArrayIMGPodcast[i]);
podcastList.add(item);
}
setListAdapter(new PodcastAdapter(this, podcastList));
((PullToRefreshListView) getListView()).setOnItemClickListener((OnItemClickListener) this);
}
public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {
//Inicia Activity da podcast referente a seu numero da lista
Intent myintent = new Intent("com.example.player.PODCAST");
Bundle mybundle = new Bundle();
mybundle.putInt("podcastnumber", (position-1));
Log.e("posicao na lista",""+position);
myintent.putExtras(mybundle);
startActivity(myintent);
}
private class DoInBackground extends AsyncTask<Void, Void, Void>
implements DialogInterface.OnCancelListener
{
private ProgressDialog dialog;
protected void onPreExecute()
{
dialog = ProgressDialog.show(PullToRefreshActivity.this, "", "Carregando Podcasts...", true);
}
protected Void doInBackground(Void... unused)
{
PodcastAdapter.topBar=true;
do_update();
return null;
}
protected void onPostExecute(Void unused)
{
((PullToRefreshListView) getListView()).onRefreshComplete();
dialog.dismiss();
populate_listview();
}
public void onCancel(DialogInterface dialog)
{
cancel(true);
dialog.dismiss();
}
}
public static boolean Conectado(Context context) {
try {
ConnectivityManager cm = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
String LogSync = null;
String LogToUserTitle = null;
if (cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnected()) {
LogSync += "\nConectado a Internet 3G ";
LogToUserTitle += "Conectado a Internet 3G ";
return true;
} else if(cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnected()){
LogSync += "\nConectado a Internet WIFI ";
LogToUserTitle += "Conectado a Internet WIFI ";
return true;
} else {
LogSync += "\nNão possui conexão com a internet ";
LogToUserTitle += "Não possui conexão com a internet ";
return false;
}
} catch (Exception e) {
return false;
}
}
}