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私はwww.omdbapi.comからデータを取得しています。私は私のカスタムListViewにムービーIDと共にムービーIDを表示したい。しかし、私はonPostExecute()のAsyncTaskのプロセスで立ち往生しています。カスタムアダプターを更新できません。あなたのpostExecute（）メソッドアダプタを設定するためのループのために削除して、単にこのようにそれを行うにはAndroidでASyncTaskを使用してCustomAdapterを更新する方法
私のListViewの活動
public class MovieSearch extends AppCompatActivity {
ListViewAdapter listViewAdapter ;
ListView lview;
EditText moviename ;
ProgressDialog progressDialog;
String name ;
private final static String name1[] = {
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"};
private final static String id[] = {
"Month - 1",
"Month - 2",
"Month - 3",
"Month - 4",
"Month - 5",
"Month - 6",
"Month - 7",
"Month - 8",
"Month - 9",
"Month - 10",
"Month - 11",
"Month - 12"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_search);
moviename = (EditText) findViewById(R.id.search_movie_name);
lview = (ListView) findViewById(R.id.list_movie);
//listViewAdapter = new ListViewAdapter(this, new String[]{}, new String[]{});
lview.setAdapter(listViewAdapter);
lview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Object movieid = listViewAdapter.getItem(position);
//Intent intent = new Intent(MovieSearch.this, MovieDetails .class).putExtra(Intent.EXTRA_TEXT, movieid);
//startActivity(intent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void searching(View view) {
name = moviename.getText().toString();
new RetrieveFeedTask().execute(name);
}
public class RetrieveFeedTask extends AsyncTask<String, Void, String[]>{
private final String LOG_TAG = RetrieveFeedTask.class.getSimpleName();
private String[] getMovieDataFromJson(String jsonstring, int cnt) throws JSONException{
final String SEARCH = "Search";
final String TITLE = "Title";
final String YEAR = "Year";
final String POSTER = "Poster";
final String MOVIEID = "imdbID" ;
JSONObject jsonObject = new JSONObject(jsonstring);
JSONArray jsonArray = jsonObject.getJSONArray(SEARCH);
String[] resultStrs = new String[cnt];
String[] movIdStrs = new String[cnt];
String[] coverStrs = new String[cnt];
for (int i = 0; i < jsonArray.length(); i++){
String movname;
String movyear;
String movcover;
String movieID;
JSONObject titleobj = jsonArray.getJSONObject(i);
movname = titleobj.getString(TITLE);
movyear = titleobj.getString(YEAR);
movcover = titleobj.getString(POSTER);
movieID = titleobj.getString(MOVIEID);
resultStrs[i] = movname + " [" + movyear + "]";
movIdStrs[i] = movieID ;
coverStrs[i] = movcover ;
name1[i] = resultStrs[i];
id[i] = movIdStrs[i];
}
for (String s : resultStrs){
Log.v(LOG_TAG, "Movie Entry : " + s);
}
return resultStrs;
}
@Override
protected void onPreExecute(){
progressDialog = ProgressDialog.show(MovieSearch.this, "", "Searching for "+name+"...", true);
}
@Override
protected String[] doInBackground(String... params) {
String jsonString;
try{
URL url = new URL("http://www.omdbapi.com/?s="+params[0]);
Log.v(LOG_TAG, "URL : " + url);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder stringBuilder = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
stringBuilder.append(line).append("\n");
}
bufferedReader.close();
progressDialog.dismiss();
jsonString = stringBuilder.toString();
Log.v(LOG_TAG, "JSONString : " + jsonString);
}
finally{
urlConnection.disconnect();
}
}
catch(Exception e) {
Log.e("ERROR", e.getMessage(), e);
return null;
}
try{
return getMovieDataFromJson(jsonString, 10);
}catch (JSONException e){
Log.e(LOG_TAG, e.getMessage(), e);
e.printStackTrace();
}
return new String[0];
}
@Override
protected void onPostExecute(String[] res){
if (res != null){
// mMovie.clear();
for (String newmovstr : res){
//mMovieAdapter.add(newmovstr);
listViewAdapter = new ListViewAdapter(MovieSearch.this, newmovstr, newmovstr);
}
}
}
}
}
マイCustomListViewAdpter
public class ListViewAdapter extends BaseAdapter {
Activity context;
String name;
String id;
public ListViewAdapter(Activity context, String name, String id) {
super();
this.context = context;
this.name = name;
this.id = id;
}
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
private class ViewHolder {
TextView txtViewName;
TextView txtViewID;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null)
{
convertView = inflater.inflate(R.layout.list_item_movie, null);
holder = new ViewHolder();
holder.txtViewName = (TextView) convertView.findViewById(R.id.list_item_movie_textview);
holder.txtViewID = (TextView) convertView.findViewById(R.id.list_item_movieID_textview);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.txtViewName.setText(name);
holder.txtViewID.setText(id);
return convertView;
}
}
変更します。個々の要素ではなく、データのリストを渡す必要があります。 –
lview.setAdapter（listViewAdapter）;これをpostexecuteの内側に入れ、oncreateから削除する - > listViewAdapter = new ListViewAdapter（MovieSearch.this、newmovstr、newmovstr）; –