我写了json并在git的帮助下创建了url。但是现在我无法获得所请求的数据，因为结果即将到来null。请帮助我
public class TestActivity extends AppCompatActivity {
Button btnHit;
ListView moviList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
btnHit= (Button) findViewById(R.id.btn);
moviList=(ListView)findViewById(R.id.lvMovie);
/* btnHit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new JSONTask().execute("https://gist.githubusercontent.com/PoonamWadekar/5c69afdcbe9c68240c546f73bcb40c69/raw/050254dd568a972442cdff0d984c396b9b340b7f/movie.json");
}
});*/
}
public class JSONTask extends AsyncTask<String,String,List<MovieModel>>{
@Override
protected List<MovieModel> doInBackground(String... params) {
HttpURLConnection httpURLConnection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.connect();
InputStream inputStream = httpURLConnection.getInputStream();
reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
String finalJson=buffer.toString();
JSONObject parentObj=new JSONObject(finalJson);
JSONArray parentArray=parentObj.getJSONArray("movies");
List<MovieModel> movieModelList=new ArrayList<>();
for (int i=0; i<parentArray.length() ; i++)
{
JSONObject finalObj=parentArray.getJSONObject(i);
MovieModel movieModel=new MovieModel();
movieModel.setMovie(finalObj.getString("movie"));
movieModel.setYear(finalObj.getInt("year"));
movieModel.setRating((float) finalObj.getDouble("rating")/2);
movieModel.setStory(finalObj.getString("story"));
//movieModel.setImage(finalObj.getString("image"));
List<MovieModel.Caste> casteList=new ArrayList<>();
for (int j=0;j<finalObj.getJSONArray("caste").length();j++){
MovieModel.Caste caste=new MovieModel.Caste();
caste.setName(finalObj.getJSONArray("caste").getJSONObject(j).getString("name"));
casteList.add(caste);
}
movieModel.setCasteList(casteList);
movieModelList.add(movieModel);
Log.d("hi","list+++++++++++++++++++++++" +movieModelList);
}
return movieModelList;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (httpURLConnection != null)
httpURLConnection.disconnect();
try {
if (reader != null)
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(List<MovieModel> result) {
super.onPostExecute(result);
if (result==null){
Log.d("Hi","sorry no result");
return;
}
//set data to recycler view
MovieAdapter adapter=new MovieAdapter(getApplicationContext(),R.layout.movie_cell,result);
moviList.setAdapter(adapter);
}
}
public class MovieAdapter extends ArrayAdapter{
private List<MovieModel> movieModelList=new ArrayList<MovieModel>();
private int resource;
LayoutInflater inflater;
public MovieAdapter(Context context, int resource, List<MovieModel> objects) {
super(context, resource, objects);
movieModelList=objects;
this.resource=resource;
inflater= (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
}
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView==null)
{
convertView=inflater.inflate(resource,null);
}
ImageView movieIcon;
TextView name;
TextView year;
RatingBar ratingBar;
TextView tvCaste;
TextView story;
movieIcon= (ImageView) convertView.findViewById(R.id.place_image);
name= (TextView) convertView.findViewById(R.id.tv_name);
year= (TextView) convertView.findViewById(R.id.tv_year);
ratingBar= (RatingBar) convertView.findViewById(R.id.rt_ratebar);
tvCaste= (TextView) convertView.findViewById(R.id.tv_cast);
story= (TextView) convertView.findViewById(R.id.tv_story);
name.setText(movieModelList.get(position).getMovie());
year.setText(" year -"+ movieModelList.get(position).getYear());
StringBuffer stringBuffer=new StringBuffer();
for (MovieModel.Caste caste: movieModelList.get(position).getCasteList()){
stringBuffer.append(caste.getName() + ",");
}
tvCaste.setText(stringBuffer);
story.setText(movieModelList.get(position).getStory());
// rating bar
ratingBar.setRating(movieModelList.get(position).getRating()/2);
return convertView;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.actionbar_profile,menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id=item.getItemId();
if(id==R.id.refresh){
String url="https://gist.githubusercontent.com/PoonamWadekar/5c69afdcbe9c68240c546f73bcb40c69/raw/9e3de75ffa48c70f81ad07b7623e5fd0789142f0/movie.json";
Log.d("url____",url);
new JSONTask().execute(url);
return true;
}
return super.onOptionsItemSelected(item);
}
}
答案 0 :(得分：0)
我的设备运行正常。 对你的情况几乎没有疑问。