我正在尝试创建一个访问RottenTomatoes.com的Android应用程序并加载即将上映的电影的API数据。
我可以成功获取API数据，但是当我尝试解析数据时遇到了麻烦。
以下是无效的代码块：
public class MovieJSONParser {
static public class MovieParser{
static ArrayList<Movie> parseMovie(String jsonString) throws JSONException {
ArrayList<Movie> movies = new ArrayList<Movie>();
JSONObject moviesJSON = new JSONObject(jsonString);
JSONArray moviesArray = moviesJSON.getJSONArray("movies");
Log.d("app", "in MovieJSONParser");
for (int i = 0; i < moviesArray.length(); i++) {
JSONObject o = moviesArray.getJSONObject(i);
Log.d("app", o.toString());
Log.d("app", "Created a JSON object to put in Movies");
// THIS LINE ISN'T WORKING
Movie movie = new Movie(o);
Log.d("app", "after Movie declaration");
movies.add(movie);
}
Log.d("app", "end of MovieJSONParser");
return movies;
}
}
}
我知道我标记为无效的代码行无效，因为日志注释在语句之前都正确显示：
Movie movie = new Movie(o);
这行代码很简单......一个简单的类对象声明......我不知道它为什么会让程序崩溃......没有实际的错误。该计划正在运行。
这是我的Movie.class：
public class Movie extends Activity {
String url_posterThumbnail, title, year, mpaa_rating;
int critics_score;
public Movie(JSONObject o) throws JSONException {
Log.d("app", "in Movie");
this.title = o.getString("title");
this.year = o.getString("year");
this.mpaa_rating = o.getString("mpaa_rating");
this.critics_score = o.getInt("critics_score");
this.url_posterThumbnail = o.getString("thumbnail");
}
public String returnUrl_posterThumbnail() {
return url_posterThumbnail;
}
public void setUrl_posterThumbnail(String url_posterThumbnail) {
this.url_posterThumbnail = url_posterThumbnail;
}
public String returnTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String returnYear() {
return year;
}
public void setYear(String year) {
this.year = year;
}
public String returnMpaa_rating() {
return mpaa_rating;
}
public void setMpaa_rating(String mpaa_rating) {
this.mpaa_rating = mpaa_rating;
}
public int returnCritics_score() {
return critics_score;
}
public void setCritics_score(int critics_score) {
this.critics_score = critics_score;
}
@Override
public String toString() {
return "Movie [url_posterThumbnail=" + url_posterThumbnail + ", title="
+ title + ", year=" + year + ", mpaa_rating=" + mpaa_rating
+ ", critics_score=" + critics_score + "]";
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movies);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.movies, menu);
return true;
}
}
如果您需要，请点击我的MainActivity.class：
public class MainActivity extends Activity {
String APIKEY = "vs6hcrs57h4wy74u3zgxhmrm";
String url_MY_FAVORITE_MOVIES = "";
String url_BOX_OFFICE_MOVIES = "http://api.rottentomatoes.com/api/public/v1.0/lists/movies/box_office.json?limit=3&country=us&apikey=p53b5bybwxpg7nfykwzezkzr";
String url_IN_THEATRES_MOVIES = "http://api.rottentomatoes.com/api/public/v1.0/lists/movies/in_theaters.json?page_limit=3&page=1&country=us&apikey=p53b5bybwxpg7nfykwzezkzr";
String url_OPENING_MOVIES = "http://api.rottentomatoes.com/api/public/v1.0/lists/movies/opening.json?limit=3&country=us&apikey=p53b5bybwxpg7nfykwzezkzr";
String url_UPCOMING_MOVIES = "http://api.rottentomatoes.com/api/public/v1.0/lists/movies/upcoming.json?page_limit=3&page=1&country=us&apikey=p53b5bybwxpg7nfykwzezkzr";
ListView listview;
ArrayList<Movie> movies = new ArrayList<Movie>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d("app", "Hi! In onCreate");
listview = (ListView) findViewById(R.id.listView1);
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_list_item_1);
listview.setAdapter(arrayAdapter);
arrayAdapter.add("My Favorite Movies");
arrayAdapter.add("Box Office Movies");
arrayAdapter.add("In Theatres Movies");
arrayAdapter.add("Opening Movies");
arrayAdapter.add("Upcoming Movies");
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int listViewPosition,
long arg3) {
Intent i = new Intent(getBaseContext(), MoviesDetails.class);
switch (listViewPosition) {
case 0:
try {
movies = new GetMoviesASYNCTASK(MainActivity.this).execute(url_MY_FAVORITE_MOVIES).get();
} catch (InterruptedException e1) {
e1.printStackTrace();
} catch (ExecutionException e1) {
e1.printStackTrace();
}
Log.d("app", "right before starting MoviesDetails activity");
i.putExtra("movies", movies);
startActivity(i);
break;
case 1:
try {
movies = new GetMoviesASYNCTASK(MainActivity.this).execute(url_BOX_OFFICE_MOVIES).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
Log.d("app", "right before starting MoviesDetails activity");
i.putExtra("movies", movies);
startActivity(i);
break;
case 2:
try {
movies = new GetMoviesASYNCTASK(MainActivity.this).execute(url_IN_THEATRES_MOVIES).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
Log.d("app", "right before starting MoviesDetails activity");
i.putExtra("movies", movies);
startActivity(i);
break;
case 3:
try {
movies = new GetMoviesASYNCTASK(MainActivity.this).execute(url_OPENING_MOVIES).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
Log.d("app", "right before starting MoviesDetails activity");
i.putExtra("movies", movies);
startActivity(i);
break;
case 4:
try {
movies = new GetMoviesASYNCTASK(MainActivity.this).execute(url_UPCOMING_MOVIES).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
Log.d("app", "right before starting MoviesDetails activity");
i.putExtra("movies", movies);
startActivity(i);
break;
default:
break;
}
Log.d("app", "end of file?");
}
});
}
@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;
}
}
最后，如果您需要，请点击我的GetMoviesASYNCTASK.class：
public class GetMoviesASYNCTASK extends AsyncTask<String, Void, ArrayList<Movie>> {
String url_string;
ProgressDialog pd;
MainActivity main;
public GetMoviesASYNCTASK(MainActivity main){
this.main = main;
}
@Override
protected ArrayList<Movie> doInBackground(String... params) {
url_string = params[0];
// pd = new ProgressDialog(main);
// pd.setCancelable(false);
// pd.setMessage("Loading Movies...!");
// pd.show();
Log.d("app", "begin asynctask");
try {
URL url = new URL(url_string);//Parse the string as an url
HttpURLConnection con = (HttpURLConnection) url.openConnection();
//create a http connection using that url
con.setRequestMethod("GET");//Use the get method
con.connect(); //Connect to http
int statusCode = con.getResponseCode();//Get the server's response
if (statusCode == HttpURLConnection.HTTP_OK) { //If server returns 200
BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = reader.readLine();
while (line != null) {
sb.append(line);
line = reader.readLine();
}
Log.d("app", "String value of API stored");
ArrayList<Movie> movies = MovieJSONParser.MovieParser.parseMovie(sb.toString());
Log.d("app", "movies in ASYNCTASK initialized :)");
return movies;
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d("app", "asynctask didn't work");
return null;
}
// Override
protected void onPostExecute(ArrayList<Movie> result) {
//ArrayList<String> movieTitles = new ArrayList<String>();
super.onPostExecute(result);
Log.d("app", "exiting asynctask");
//pd.dismiss();
}
}
我错过了一些明显的东西吗？
任何帮助将不胜感激！
答案 0 :(得分：0)
critics_score是评级对象，但在这里你试图直接访问该密钥。所以它抛出异常。
最好使用带有一些默认值而不是getString（）的optString（），因为即使密钥不存在，也不会以异常结束。
以下是工作代码：
JSONObject object = new JSONObject(result);
JSONArray records = object.getJSONArray("movies");
Log.d(LOG_TAG, "records" + records);
int len = records.length();
String albumart[] = new String[len];
for (int i = 0; i < len; i++) {
JSONObject record = (JSONObject) records.getJSONObject(i);
String extid = record.getString("id");
String accountName = record.optString("title", "No title");
JSONObject posters = record.getJSONObject("posters");
String albuart = posters.optString("detailed", null);
String critics = record.optString("critics_consensus", "No Critics");
String year = record.getString("year");
String rating = record.optString("mpaa_rating", "No rating");
JSONObject ratings = record.getJSONObject("ratings");
String rating = ratings.optString("critics_score", "");
if(rating.length() <= 0 ) {
rating = "0";
}
String audience_rating = ratings.optString("audience_rating", "");
if(audience_rating.length() <= 0 ) {
audience_rating = "0";
}
String duration = record.optString("runtime", "");
if(duration.length() <= 0 ) {
duration = "0"
}
}