[英]Can't get int or double to display on RecyclerView after parsing json
When I just display string data it seems to show up fine, but when I try to display an int or double the RecyclerView won't populate. 当我只显示字符串数据时,看起来似乎很好,但是当我尝试显示int或double时,不会填充RecyclerView。 I am pulling from the Google places API JSON.
我从Google Places API JSON中提取。 I think maybe it is the way I'm using my
onBindViewHolder()
? 我认为这可能是我使用
onBindViewHolder()
吗? Thanks 谢谢
// MainActivity
private void getJson() {
String URL = https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.7085,-74.003124&opennow&radius=5000&type=restaurant&key=
JsonObjectRequest root = new JsonObjectRequest(Request.Method.GET, URL, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray results = response.getJSONArray("results");
Log.d("RESULTS", String.valueOf(results));
for(int i = 0; i<results.length(); i++) {
JSONObject resultsObj = results.getJSONObject(i);
mImageUrls.add(resultsObj.getString("icon"));
mTitle.add(resultsObj.getString("name"));
//mRating.add(resultsObj.getDouble("rating"));
mPriceLevel.add(resultsObj.getInt("price_level"));
}
getRecyclerView();
} catch (JSONException e) {
e.printStackTrace();
}
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
mRequestQueue.add(root);
}
private void getRecyclerView() {
// LinearLayoutManager
recyclerView = findViewById(R.id.recyclerView);
adapter = new RecyclerViewAdapter(mImageUrls, mTitle, mPriceLevel, this);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
}
And the RecyclerViewAdapter
Class is. 而
RecyclerViewAdapter
类是。
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
private static final String TAG = "RecyclerViewAdapter";
private ArrayList<String> rNames = new ArrayList<>();
private ArrayList<String> rImageUrls = new ArrayList<>();
private ArrayList<Double> rRatings = new ArrayList<>();
private ArrayList<Integer> rPriceLevel = new ArrayList<>();
private Context mContext;
public RecyclerViewAdapter(ArrayList<String> image, ArrayList<String> name, ArrayList<Integer> priceLevel, Context context) {//, ArrayList<Double> rating
this.rImageUrls = image;
this.rNames = name;
//this.rRatings = rating;
this.rPriceLevel = priceLevel;
mContext = context;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_item, parent, false);
ViewHolder holder = new ViewHolder(view);
return holder;
//return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, final int position) {
Glide.with(mContext).asBitmap().load(rImageUrls.get(position)).into(holder.image);
holder.name.setText(rNames.get(position));
//holder.rating.setText(rRatings.get(position));
holder.priceLevel.setText(rPriceLevel.get(position));
holder.parentLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: clicked on an image: " + rNames.get(position));
Toast.makeText(mContext, rNames.get(position), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public int getItemCount() {
return rNames.size(); //we can use rImageUrls/rRatings as well because they are all the same size
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView image;
TextView name;
TextView rating;
TextView priceLevel;
TextView address;
RelativeLayout parentLayout;
public ViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.image);
name = (TextView) itemView.findViewById(R.id.title);
//rating = itemView.findViewById(R.id.rating);
priceLevel = (TextView) itemView.findViewById(R.id.priceLevel);
parentLayout = itemView.findViewById(R.id.parentLayout);
}
}
}
The reason for this is you are not converting Double to String change this line holder.rating.setText(rRatings.get(position));
原因是您没有将Double转换为String,请更改此行
holder.rating.setText(rRatings.get(position));
to holder.rating.setText(String.valueOf(rRatings.get(position)));
到
holder.rating.setText(String.valueOf(rRatings.get(position)));
I would like to suggest you to create an object having all necessary parameters in it and then pass a single list of that object to the RecyclerViewAdapter
. 我建议您创建一个包含所有必需参数的对象,然后将该对象的单个列表传递给
RecyclerViewAdapter
。
public class MapElement {
public String name;
public String imageUrl;
public Double rating;
public Integer price;
}
Then create an ArrayList
of this object when you get the response from your getJson
function call. 然后,当您从
getJson
函数调用获得响应时,请为此对象创建一个ArrayList
。 Now in your adapter just use a single list of MapElement
object to show the data from there. 现在,在适配器中,只需使用一个
MapElement
对象列表即可显示其中的数据。
The modified adapter should look like this. 修改后的适配器应如下所示。
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
private static final String TAG = "RecyclerViewAdapter";
private ArrayList<MapElement> elements = new ArrayList<>();
private Context mContext;
public RecyclerViewAdapter(ArrayList<MapElement> elements, Context context) {
this.elements = elements;
mContext = context;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_item, parent, false);
ViewHolder holder = new ViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, final int position) {
Glide.with(mContext).asBitmap().load(rImageUrls.get(position)).into(holder.image);
holder.name.setText(elements.get(position).name);
holder.rating.setText(elements.get(position).rating);
holder.priceLevel.setText(elements.get(position).price);
holder.parentLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: clicked on an image: " + rNames.get(position));
Toast.makeText(mContext, elements.get(position).name, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public int getItemCount() {
return elements.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView image;
TextView name;
TextView rating;
TextView priceLevel;
TextView address;
RelativeLayout parentLayout;
public ViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.image);
name = (TextView) itemView.findViewById(R.id.title);
rating = itemView.findViewById(R.id.rating);
priceLevel = (TextView) itemView.findViewById(R.id.priceLevel);
parentLayout = itemView.findViewById(R.id.parentLayout);
}
}
}
First you should check that the rating you are getting is a double value. 首先,您应该检查所获得的评级是否为双精度值。 It might be the case that an exception is thrown after this line
可能是在此行之后引发异常的情况
mRating.add(resultsObj.getDouble("rating"))
Also as @hooray_todd siggested textview only takes string value so you have to change your data into string. 同样,由于@hooray_todd,已签名的textview仅采用字符串值,因此您必须将数据更改为字符串。
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