java – volley-如何从Volley中的OnResponse方法返回ArrayList
发布时间：2020-12-15 04:32:30 所属栏目：Java 来源：网络整理
导读：我正在使用volley来解析REST api中的Movie Details,我将解析后的Data保存在名为detailsMovies的对象的Arraylist中.但我无法访问onResponse方法之外的ArrayList.我是 Android新手所以我不知道该怎么做. 任何帮助表示赞赏！ 这是代码：` public class MovieDet
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我正在使用volley来解析REST api中的Movie Details,我将解析后的Data保存在名为detailsMovies的对象的Arraylist中.但我无法访问onResponse方法之外的ArrayList.我是
Android新手所以我不知道该怎么做.
任何帮助表示赞赏！ 这是代码：` public class MovieDetailsActivity extends AppCompatActivity {
TextView movieIdText;
private VolleySingleton volleySingleton;
private RequestQueue mRequestQueue;
private ArrayList<MovieDetails> detailsMovies = new ArrayList<>();
// private String movieTitle ;
// private String movieSummary ;
// private int movieYear;
// private long movieRating;
// private String movieYoutubeId;
// private String movieUrlThumbnail;
// private String movieDownloadLink720p;
// private String movieQuality720p;
// private String moviefileSize720p;
// private String movieDownloadLink1080p;
// private String movieQuality1080p;
// private String moviefileSize1080p;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_details);
Intent i = getIntent();
String movieId = i.getExtras().getString("movieId");
volleySingleton = VolleySingleton.getsInstance();
mRequestQueue = VolleySingleton.getmRequestQueue();
parseMovieDetails();
}
public void parseMovieDetails(){
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET,getUrl(100),new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
MovieDetails movieDetails = new MovieDetails();
if (response == null || response.length() == 0) {
Toast.makeText(getApplicationContext(),"Null Object",Toast.LENGTH_LONG).show();
}
try {
JSONObject movieData = response.getJSONObject("data");
JSONObject movieDetailsObject = movieData.getJSONObject(Keys.EndPointMovieDetails.KEYS_MOVIE);
String movieTitle = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEYS_TITLE_LONG);
long movieRating = movieDetailsObject.getInt(Keys.EndPointMovieDetails.KEYS_RATING);
String movieSynopsis = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEYS_DESCRIPTION);
String moviePosterUrl = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEYS_COVER);
String movieYoutubeId = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEY_YOUTUBE_ID);
movieDetails.setTitle(movieTitle);
movieDetails.setRating(movieRating);
movieDetails.setSummary(movieSynopsis);
movieDetails.setUrlThumbnail(moviePosterUrl);
movieDetails.setYoutube_id(movieYoutubeId);
detailsMovies.add(movieDetails);
JSONArray torrentDownloadLinks = movieDetailsObject.getJSONArray(Keys.EndPointMovieDetails.KEYS_TORRENTS);
for(int i=0;i<torrentDownloadLinks.length();i++) {
JSONObject urlInfo = torrentDownloadLinks.getJSONObject(i);
String urlTorrent = urlInfo.getString("url");
String quality = urlInfo.getString("quality");
String fileSize = urlInfo.getString("size");
movieDetails.setDownloadLink(urlTorrent);
movieDetails.setQuality(quality);
movieDetails.setFileSize(fileSize);
detailsMovies.add(movieDetails);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
mRequestQueue.add(jsonObjectRequest);
}
public String getUrl(int movieId){
return UrlEndPoints.URL_MOVIE_DETAILS+
UrlEndPoints.URl_CHAR_QUESTION+
UrlEndPoints.URL_PARAM_ID+movieId;
}
解决方法
在您的类中定义一个接口并实现它.
这里简单的技巧是与回调的接口. public class MovieDetailsActivity extends AppCompatActivity {
TextView movieIdText;
private VolleySingleton volleySingleton;
private RequestQueue mRequestQueue;
private ArrayList<MovieDetails> detailsMovies = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_details);
Intent i = getIntent();
String movieId = i.getExtras().getString("movieId");
volleySingleton = VolleySingleton.getsInstance();
mRequestQueue = VolleySingleton.getmRequestQueue();
parseMovieDetails(new CallBack() {
@Override
public void onSuccess(ArrayList<MovieDetails> detailsMovies) {
// Do Stuff
}
@Override
public void onFail(String msg) {
// Do Stuff
}
});
}
public void parseMovieDetails(final CallBack onCallBack){
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET,new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
MovieDetails movieDetails = new MovieDetails();
if (response == null || response.length() == 0) {
Toast.makeText(getApplicationContext(),Toast.LENGTH_LONG).show();
}
try {
JSONObject movieData = response.getJSONObject("data");
JSONObject movieDetailsObject = movieData.getJSONObject(Keys.EndPointMovieDetails.KEYS_MOVIE);
String movieTitle = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEYS_TITLE_LONG);
long movieRating = movieDetailsObject.getInt(Keys.EndPointMovieDetails.KEYS_RATING);
String movieSynopsis = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEYS_DESCRIPTION);
String moviePosterUrl = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEYS_COVER);
String movieYoutubeId = movieDetailsObject.getString(Keys.EndPointMovieDetails.KEY_YOUTUBE_ID);
movieDetails.setTitle(movieTitle);
movieDetails.setRating(movieRating);
movieDetails.setSummary(movieSynopsis);
movieDetails.setUrlThumbnail(moviePosterUrl);
movieDetails.setYoutube_id(movieYoutubeId);
detailsMovies.add(movieDetails);
JSONArray torrentDownloadLinks = movieDetailsObject.getJSONArray(Keys.EndPointMovieDetails.KEYS_TORRENTS);
for(int i=0;i<torrentDownloadLinks.length();i++) {
JSONObject urlInfo = torrentDownloadLinks.getJSONObject(i);
String urlTorrent = urlInfo.getString("url");
String quality = urlInfo.getString("quality");
String fileSize = urlInfo.getString("size");
movieDetails.setDownloadLink(urlTorrent);
movieDetails.setQuality(quality);
movieDetails.setFileSize(fileSize);
detailsMovies.add(movieDetails);
}
onCallBack.success(detailsMovies);
} catch (JSONException e) {
e.printStackTrace();
onCallBack.onFail(e.toString());
}
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
mRequestQueue.add(jsonObjectRequest);
}
public String getUrl(int movieId){
return UrlEndPoints.URL_MOVIE_DETAILS+
UrlEndPoints.URl_CHAR_QUESTION+
UrlEndPoints.URL_PARAM_ID+movieId;
}
public interface CallBack {
void onSuccess(ArrayList<MovieDetails> detailsMovies);
void onFail(String msg);
}
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