android应用程序编码设置的运行时错误

Question

我正在开发一款安卓应用程序，该应用程序能够根据movied.org api中最受欢迎或收视率最高的电影进行排序。该应用程序应该在设置更改时从服务器获取新数据。这不起作用。这是我的代码，请帮我完成：

//MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    if(savedInstanceState==null){
        getSupportFragmentManager().beginTransaction().replace(R.id.fragment,new MainActivityFragment()).commit();
    }
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.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) {
        startActivity(new Intent(this,SettingsActivity.class));
        return true;
    }
    return super.onOptionsItemSelected(item);
}
 }
//SettingsActivity.java
 @Override
public void onCreate(Bundle savedInstanceState){
   super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.pref_general);
    bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_order_key)));
}
public void bindPreferenceSummaryToValue(Preference preference){
    preference.setOnPreferenceChangeListener(this);
    onPreferenceChange(preference, PreferenceManager.getDefaultSharedPreferences(preference.getContext()).getString(preference.getKey(),""));
}
@Override
public boolean onPreferenceChange(Preference preference, Object value) {
    String stringValue=value.toString();
    if(preference instanceof ListPreference){
        ListPreference listPreference=(ListPreference)preference;
        int prefIndex=listPreference.findIndexOfValue(stringValue);
        if(prefIndex>=0){
            preference.setSummary(listPreference.getEntries()[prefIndex]);
        }
    }else {
        preference.setSummary(stringValue);
    }
    return true;
}
//MainActivityFragment.java
public MainActivityFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView=inflater.inflate(R.layout.fragment_main, container, false);
    if (getActivity()!=null){
        ArrayList<String>arrayList=new ArrayList<String>();
        PosterAdapter imageAdapter=new PosterAdapter(getActivity(),arrayList,deviceWidth);
        imageGridView=(GridView)rootView.findViewById(R.id.image_grid_view);
        imageGridView.setColumnWidth(deviceWidth);
        imageGridView.setAdapter(imageAdapter);
    }
    imageGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Intent intent = new Intent(getActivity(), DetailActivity.class).putExtra("overview", overview.get(position))
                    .putExtra("poster", images.get(position))
                    .putExtra("title", title.get(position))
                    .putExtra("date", date.get(position))
                    .putExtra("rating", rating.get(position));
            startActivity(intent);
        }
    });
    return rootView;
}
private class PreferenceChangeListener implements SharedPreferences.OnSharedPreferenceChangeListener{
    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        imageGridView.setAdapter(null);
        onStart();
    }
}
@Override
public void onStart(){
    super.onStart();
    sharedPreferences= PreferenceManager.getDefaultSharedPreferences(getActivity());
    preferenceChangeListener=new PreferenceChangeListener();
    sharedPreferences.registerOnSharedPreferenceChangeListener(preferenceChangeListener);
    if (sharedPreferences.getString(getString(R.string.pref_order_key),"").equals(R.string.pref_order_most_popular)){
        sortByPopular=true;
    }else if (sharedPreferences.getString(getString(R.string.pref_order_key),"").equals(R.string.pref_order_top_rated)){
        sortByPopular=false;
    }
        ImageLoader imageLoader=new ImageLoader();
    if (isInternetAvailable()) {
        imageLoader.execute();
        Log.v(LOG_TAG,"async task completed");
    }else {
        TextView textView=new TextView(getActivity());
        RelativeLayout relativeLayout=(RelativeLayout)getActivity().findViewById(R.id.fragment_layout);
        textView.setText("There is no Internet service");
        if (relativeLayout.getChildCount()==1){
            relativeLayout.addView(textView);
        }
        imageGridView.setVisibility(GridView.GONE);
    }
}
public boolean isInternetAvailable(){
    ConnectivityManager connectivityManager=(ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();
    return networkInfo !=null&&networkInfo.isConnected();
}
public class ImageLoader extends AsyncTask<Void,Void,ArrayList<String>>{

    @Override
    protected ArrayList<String> doInBackground(Void... params) {
        while (true){
            try {
                images=new ArrayList<>(Arrays.asList(getPathsFromURL(sortByPopular)));
                return images;
            }catch (Exception e){
                continue;
            }
        }
    }
    @Override
    protected void onPostExecute(ArrayList<String>results){
        if (results!=null&&getActivity()!=null){
            PosterAdapter posterAdapter=new PosterAdapter(getActivity(),results,deviceWidth);
            imageGridView.setAdapter(posterAdapter);
        }
    }
    public String[] getPathsFromURL(boolean sorting){
        while (true){
            HttpURLConnection httpURLConnection=null;
            BufferedReader bufferedReader=null;
            String JSONResult;
            try {
                if (sortByPopular){
                    url = "http://api.themoviedb.org/3/discover/movie?sort_by=popularity.desc&api_key=281ad0257e71bca17a21b42c9fee7304";
                }else {
                    url="http://api.themoviedb.org/3/discover/movie?sort_by=vote_average.desc&vote_count.gte=500&api_key=281ad0257e71bca17a21b42c9fee7304";
                }
                URL url1=new URL(url);
                httpURLConnection=(HttpURLConnection)url1.openConnection();
                httpURLConnection.setRequestMethod("GET");
                httpURLConnection.connect();
                InputStream inputStream=httpURLConnection.getInputStream();
                StringBuffer stringBuffer=new StringBuffer();
                if (inputStream==null){
                    return null;
                }
                bufferedReader=new BufferedReader(new InputStreamReader(inputStream));
                String data;
                while ((data=bufferedReader.readLine())!=null){
                    stringBuffer.append(data+"n");
                }
                if (stringBuffer.length()==0){
                    return null;
                }
                JSONResult=stringBuffer.toString();
                Log.v(LOG_TAG,JSONResult);
                try {
                    overview=new ArrayList<String>(Arrays.asList(getStringsFromAPI(JSONResult, "overview")));
                    title=new ArrayList<String>(Arrays.asList(getStringsFromAPI(JSONResult, "original_title")));
                    rating=new ArrayList<String>(Arrays.asList(getStringsFromAPI(JSONResult, "vote_average")));
                    date=new ArrayList<String>(Arrays.asList(getStringsFromAPI(JSONResult, "release_date")));
                    return getDataFromJSON(JSONResult);
                }catch (JSONException e){
                    return null;
                }
            }catch (Exception e){
                continue;
            }finally {
                if (httpURLConnection!=null){
                    httpURLConnection.disconnect();
                }
                if (bufferedReader!=null){
                    try {
                        bufferedReader.close();
                    }catch (final IOException e){
                    }
                }
            }
        }
    }
    }
    public String[] getStringsFromAPI(String JSONStringParameter,String parameter) throws JSONException{
        JSONObject jsonObject=new JSONObject(JSONStringParameter);
        JSONArray jsonArray=jsonObject.getJSONArray("results");
        String[] results=new String[jsonArray.length()];
        for (int i=0;i<jsonArray.length();i++){
            JSONObject poster=jsonArray.getJSONObject(i);
            if (parameter.equals("vote_average")){
                Double decimalNumber=poster.getDouble("vote_average");
                String userRating=Double.toString(decimalNumber)+"/10";
                results[i]=userRating;
            }
            String posterPath=poster.getString(parameter);
            results[i]=posterPath;
        }
        return results;
    }
    public String[] getDataFromJSON(String JSONStringParameter)throws JSONException{
        JSONObject jsonObject=new JSONObject(JSONStringParameter);
        JSONArray jsonArray=jsonObject.getJSONArray("results");
        String[] results=new String[jsonArray.length()];
        for (int i=0;i<jsonArray.length();i++){
            JSONObject poster=jsonArray.getJSONObject(i);
            String posterPath=poster.getString("poster_path");
            results[i]=posterPath;
        }
        return results;
    }
//PosterAdapter.java
 private Context context;
private ArrayList<String> arrayList;
private int posterWidth;
public PosterAdapter(Context c,ArrayList<String> filePaths,int a){
    context=c;
    arrayList=filePaths;
    posterWidth=a;
}
@Override
public int getCount() {
    return arrayList.size();
}
@Override
public Object getItem(int position) {
    return null;
}
@Override
public long getItemId(int position) {
    return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ImageView image;
    if (convertView==null){
        image=new ImageView(context);
    }else {
        image=(ImageView)convertView;
    }
    String url = "http://image.tmdb.org/t/p/w185" + arrayList.get(position);
    Picasso.with(context).load(url).into(image);
    return image;
}

提前感谢

Answer 1

我与另一位开发人员进行了交谈，发现我的代码是准确的，并且存在一个错误，其他开发人员正在试图找出。我会随时通知你们的。谢谢你的帮助。