我打算向 ListView 添加额外的项目，然后刷新 ListView 以显示这些项目。但是，我相信正在添加这些项目（因为当我旋转时，ListView 会刷新并显示新项目）但当前没有发生刷新。
最初将项目添加到 ListView。我使用getData。之后，每次单击“添加更多”项时，都会从 getDataMore 中检索数据。我已经尝试过诸如 addAll() 和 notifyDataSetChanged() 之类的函数，但我相信我的结构有问题。
FragmentA - 包含带有单击侦听器的 ListView 的片段：
public class FragmentA extends Fragment implements OnItemClickListener {
getData data = getData.getMyData();
public Integer ArticleID;
public CustomList adapter;
public ListView listView;
public View v;
public View V;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
V = inflater.inflate(R.layout.fragment_a, container, false);
listView = (ListView)V.findViewById(R.id.list);
v = inflater.inflate(R.layout.single_row_loadmore, null);
listView.addFooterView(v);
adapter = new CustomList(getActivity(), data.Headline.toArray(new String[data.Headline.size()]), data.Description.toArray(new String[data.Description.size()]), data.BitmapList.toArray(new Bitmap[data.BitmapList.size()]), data.ArticleID.toArray(new Integer[data.ArticleID.size()]));
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
return V;
}
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
if((position + 1) < listView.getCount()){
// TODO Auto-generated method stub
Integer IDPasser;
Intent intent = new Intent(getActivity(), ArticleViewer.class);
VariableStore.ArticleID = (Integer) data.ArticleID.toArray()[position];
// Log.e("Passer", IDPasser.toString());
startActivity(intent);
}else{
Log.e("", "Load more has been clicked");
new getDataMore().runData();
adapter = new CustomList(getActivity(), data.Headline.toArray(new String[data.Headline.size()]), data.Description.toArray(new String[data.Description.size()]), data.BitmapList.toArray(new Bitmap[data.BitmapList.size()]), data.ArticleID.toArray(new Integer[data.ArticleID.size()]));
listView.setAdapter(adapter);
}
}
}
getData - 检索第一次创建 ListView 时的数据：
public class getData {
private static getData _instance;
// Defining ArrayList
public static ArrayList<String> Headline = new ArrayList<String>();
public static ArrayList<String> Description = new ArrayList<String>();
public static ArrayList<Bitmap> BitmapList = new ArrayList<Bitmap>();
public static ArrayList<Integer> ArticleID = new ArrayList<Integer>();
// Used to get array list into fragment
public static getData getMyData() {
if (_instance == null)
_instance = new getData();
_instance.runData();
return _instance;
}
public void runData() {
StrictMode.enableDefaults(); // STRICT MODE ENABLED
String result = "";
InputStream isr = null;
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://www.createyourownnews.co.uk/getAllCustomers.php"); // YOUR
// PHP
// SCRIPT
// ADDRESS
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
isr = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
isr, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
isr.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
// parse json data
try {
String s = "";
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json = jArray.getJSONObject(i);
Headline.add(json.getString("NewsStory"));
Description.add(json.getString("Summary1"));
ArticleID.add(json.getInt("ID"));
if (json.getString("Picture1URL").length() == 0) {
json.getString("Picture1URL")
.equals("http://4.bp.blogspot.com/-JOqxgp-ZWe0/U3BtyEQlEiI/AAAAAAAAOfg/Doq6Q2MwIKA/s1600/google-logo-874x288.png");
}
Log.e("", json.getString("Picture1URL"));
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream((InputStream) new URL(
json.getString("Picture1URL")).getContent());
BitmapList.add(bitmap);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (Exception e) {
Log.e("log_tag", "Error Parsing Data " + e.toString());
}
}
}
getDataMore - 添加到已创建的 ArrayLists 中的是 getData：
public class getDataMore {
public void runData() {
getData data = getData.getMyData();
StrictMode.enableDefaults(); // STRICT MODE ENABLED
String result = "";
InputStream isr = null;
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://www.createyourownnews.co.uk/getAllCustomers.php"); // YOUR
// PHP
// SCRIPT
// ADDRESS
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
isr = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection " + e.toString());
// ERROR CONNECTING
}
// convert response to string
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
isr, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
isr.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
// parse json data
try {
String s = "";
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json = jArray.getJSONObject(i);
data.Headline.add(json.getString("NewsStory"));
data.Description.add(json.getString("Summary1"));
data.ArticleID.add(json.getInt("ID"));
if(json.getString("Picture1URL").length() == 0){
json.getString("Picture1URL").equals("http://4.bp.blogspot.com/-JOqxgp-ZWe0/U3BtyEQlEiI/AAAAAAAAOfg/Doq6Q2MwIKA/s1600/google-logo-874x288.png");
}
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream((InputStream) new URL(json.getString("Picture1URL")).getContent());
data.BitmapList.add(bitmap);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Log.e("log_tag", "Iteration" + i);
}
} catch (Exception e) {
Log.e("log_tag", "Error Parsing Data " + e.toString());
}
}
}
如果有帮助 - CustomList 适配器：
public class CustomList extends ArrayAdapter<String>{
private final Activity context;
private final String[] titleId;
private final String[] descriptionId;
private final Bitmap[] pictureid;
public CustomList(Activity context,
String[] Headline, String[] Description, Bitmap[] BitmapList, Integer[] ArticleID) {
super(context, R.layout.single_row, Headline);
this.context = context;
this.titleId = Headline;
this.descriptionId = Description;
this.pictureid = BitmapList;
}
@Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.single_row, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.tvTitle);
TextView txtDescription = (TextView) rowView.findViewById(R.id.tvDescription);
ImageView imageView = (ImageView) rowView.findViewById(R.id.ivIcon);
txtTitle.setText(titleId[position]);
txtDescription.setText(descriptionId[position]);
imageView.setImageBitmap(pictureid[position]);
return rowView;
}
}