Java 从片段到非活动类获取字符串,然后转换为JSONObject
我试图将I从片段传递到非活动类,并将字符串转换为JSONObject 在我的片段中,我将需要的字符串存储在一个共享优先权中Java 从片段到非活动类获取字符串,然后转换为JSONObject,java,android,android-fragments,sharedpreferences,Java,Android,Android Fragments,Sharedpreferences,我试图将I从片段传递到非活动类,并将字符串转换为JSONObject 在我的片段中,我将需要的字符串存储在一个共享优先权中 @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View rootView = inflater.inflate(R.layout.store_list, co
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.store_list, container, false);
//super.onCreate();
VolleyGet.getInstance(getActivity());
VolleyGet.getInstance().VolleyGET(domain, api, new CustomListener<String>(){
@Override
public void getResult(String result){
if (!result.isEmpty())
{
Log.e("storelist---------->", result);
SharedPreferences sp1=getActivity().getSharedPreferences("storeList", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp1.edit();
editor.putString("storeList", result);
editor.commit();
}
}
});
在我的非活动课程中,我尝试获得如下共享偏好:
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder>{
Context context;
JSONArray storeArray;
SharedPreferences preferences = context.getSharedPreferences("storeList", Activity.MODE_PRIVATE);
String storeList = preferences.getString("storeList", "");
System.out.println("storelist", storeList);
storeArray = new JSONArray(storeList);
JSONObject jObj = storeArray.getJSONObject(0);
List<Movie> mItems;
public CardAdapter() {
super();
mItems = new ArrayList<Movie>();
Movie movie = new Movie();
movie.setName("this will come from the JSONObject");
movie.setThumbnail(R.drawable.will come from JSONObject);
mItems.add(movie);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.store_cardview, viewGroup, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
Movie movie = mItems.get(i);
viewHolder.tvMovie.setText(movie.getName());
viewHolder.imgThumbnail.setImageResource(movie.getThumbnail());
}
@Override
public int getItemCount() {
return mItems.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public ImageView imgThumbnail;
public TextView tvMovie;
public ViewHolder(View itemView) {
super(itemView);
imgThumbnail = (ImageView)itemView.findViewById(R.id.img_thumbnail);
tvMovie = (TextView)itemView.findViewById(R.id.tv_movie);
}
}
}
我在1上遇到错误。无法解析符号println 2。未知类:storelist 3。storearray也是未知的
请帮忙,谢谢 首先,您不能访问System.out.println或在您的问题范围之外执行操作的未初始化上下文
关于其他错误,我认为您没有显示正确的代码,但是如果错误是storelist,那么您的变量实际上是storelist,因此看起来像是输入错误
看看任何关于RecyclerView适配器的教程,构造函数通常是由上下文提供的。这就是访问SharedReferences所需要的
public class CardAdapter extends
RecyclerView.Adapter<CardAdapter.ViewHolder> {
private JSONArray mArray;
private Context mContext;
private SharedPreferences mPrefs;
public CardAdapter(Context context) {
mContext = context;
mPrefs = context.getSharedPreferences("storeList", Activity.MODE_PRIVATE);
mArray = new JSONArray(mPrefs.getString("storeList", "[]"));
}
}
你不能只在方法外打印LN你真的需要适配器中的共享首选项吗?为什么您不能在创建适配器之前提取json数组/对象?@cricket_007我可以在外部提取它,但我仍然想知道如何在类中获取共享首选项,谢谢!1请显示该类的构造函数。当前,您的上下文值为null,因此,如果确实编译了该代码,则不应运行该代码。2我不知道未知类storelist引用的是什么错误,因为您仅声明了storelistfine@cricket_0071我已经将类2编辑为Me,我不明白为什么我的storeList不起作用。关于你的评论,你不能只在方法外打印,准确地说,不能在块外打印;