我有一个类从数据库中检索数据并使用简单的适配器
将其显示在列表视图中public class ViewExs extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://www.lamia.byethost18.com/get_all_ex.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "ID_exercise";
private static final String TAG_NAME = "ID_exercise";
// products JSONArray
JSONArray products = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_exs);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent i = new Intent(getApplicationContext(), EditProductActivity.class);
startActivity(i);
/* // getting values from selected ListItem
String pid = ((TextView) view.findViewById(R.id.pid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
EditProductActivity.class);
// sending pid to next activity
in.putExtra(TAG_PID, pid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);*/
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ViewExs.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
ViewExs.this, productsList,
R.layout.item_list_3, new String[] {TAG_NAME},
new int[] { R.id.pid});
// updating listview
setListAdapter(adapter);
}
});
}
}
}
我想使用自定义适配器而不是简单的适配器..这是我的自定义适配器
public class MySimpleArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final String[] values;
TextView textView;
public MySimpleArrayAdapter(Context context, String[] values) {
super(context, R.layout.item_list_3, values);
this.context = context;
this.values = values;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.item_list_3, parent, false);
final TextView textView = (TextView) rowView.findViewById(R.id.pid);
textView.setText(values[position]);
return rowView;
}
}
我如何做这部分代码
ListAdapter adapter = new SimpleAdapter(
ViewExs.this, productsList,
R.layout.item_list_3, new String[] {TAG_NAME},
new int[] { R.id.pid});
// updating listview
setListAdapter(adapter);
？
有人可以帮忙吗？
答案 0 :(得分：0)
只需在方法中使用MySimpleArrayAdapter并设置适配器 -
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable()
{
public void run()
{
/**
* Updating parsed JSON data into ListView
* */
MySimpleArrayAdapter adapter = new MySimpleArrayAdapter(ViewExs.this,
new String[] {TAG_NAME});
// updating listview
setListAdapter(adapter);
}
});
}
答案 1 :(得分：0)
假设您的值数组是String []值，那么
MySimpleArrayAdapter adapter = new MySimpleArrayAdapter(
ViewExs.this,values);
setListAdapter(adapter);
答案 2 :(得分：0)
您好我使用了下面的自定义数组适配器，它只是一个示例。但我希望它有所帮助。它显示使用显示它的片段中的ArrayList发送给它的数据。
public class MovieAdapter extends ArrayAdapter<Movie> {
private Context context;
private List<Movie> movies;
public MovieAdapter(Context context, List<Movie> movies) {
super(context, R.layout.movie_layout, movies);
this.context = context;
this.movies = movies;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View movieView = convertView;
if (movieView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
movieView = inflater.inflate(R.layout.movie_layout, parent, false);
}
movieView.setTag(movies.get(position));
TextView txtTitle = (TextView) movieView.findViewById(R.id.txtTitle);
TextView txtDate = (TextView) movieView.findViewById(R.id.txtDate);
RatingBar ratingBar = (RatingBar) movieView
.findViewById(R.id.ratingBar);
txtTitle.setText(movies.get(position).MovieTitle);
txtDate.setText("Date Viewed: " + movies.get(position).dateViewed);
ratingBar.setIsIndicator(true);
ratingBar.setNumStars(movies.get(position).rating);
ratingBar.setRating(movies.get(position).rating);
return movieView;
}
}
片段
public class MyListFragment extends Fragment {
Movie movie;
MovieAdapter adapter;
MovieSelectedListener callBack;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.list_fragment, container, false);
ListView movieList = (ListView) view.findViewById(R.id.movieList);
movieList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
TextView movie = (TextView) view.findViewById(R.id.txtTitle);
String title = movie.getText().toString();
callBack.onMovieSelected(title);
}
});
if (getArguments() != null)
movie = (Movie) getArguments().getSerializable("Movie");
Log.v("PASSED", "Got here");
adapter = new MovieAdapter(getActivity(), movie.movies);
movieList.setAdapter(adapter);
movieList.setLongClickable(true);
movieList.setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent,
final View view, int position, long id) {
// TODO Auto-generated method stub
AlertDialog.Builder dialog = new AlertDialog.Builder(
getActivity());
dialog.setMessage("Are you sure you want to delete this movie?");
dialog.setTitle("Alert Message");
dialog.setCancelable(false);
dialog.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
TextView movie = (TextView) view
.findViewById(R.id.txtTitle);
String title = movie.getText().toString();
callBack.onDeleteSelected(title, adapter);
}
});
dialog.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
}
});
dialog.show();
return false;
}
});
return view;
}
public interface MovieSelectedListener {
public void onMovieSelected(String movie);
public void onDeleteSelected(String movie, MovieAdapter adapter);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
;
try {
callBack = (MovieSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement MovieSelectedListener");
}
}
public void sortTitle() {
adapter.sort(new Comparator<Movie>() {
public int compare(Movie lhs, Movie rhs) {
return lhs.MovieTitle.compareTo(rhs.MovieTitle);
}
});
adapter.notifyDataSetChanged();
}
public void sortDateViewed() {
adapter.sort(new Comparator<Movie>() {
public int compare(Movie lhs, Movie rhs) {
return lhs.dateViewed.compareTo(rhs.dateViewed);
}
});
adapter.notifyDataSetChanged();
}
public void sortRating() {
adapter.sort(new Comparator<Movie>() {
public int compare(Movie lhs, Movie rhs) {
return ((Integer) lhs.rating).compareTo(rhs.rating);
}
});
adapter.notifyDataSetChanged();
}
}