Java RecyclerView没有';我什么也没表现出来
好的,我有两个文本视图“name”和“id”,我想从recyclerview和json中填充它们。 我可以在Android监视器中获取json,但它在recyclerview中没有显示任何内容 以下是我的MainActivity.java:Java RecyclerView没有';我什么也没表现出来,java,android,json,android-studio,android-volley,Java,Android,Json,Android Studio,Android Volley,好的,我有两个文本视图“name”和“id”,我想从recyclerview和json中填充它们。 我可以在Android监视器中获取json,但它在recyclerview中没有显示任何内容 以下是我的MainActivity.java: txt = (TextView) findViewById(R.id.name); idd = (TextView) findViewById(R.id.id); recyclerView = (RecyclerView) findV
txt = (TextView) findViewById(R.id.name);
idd = (TextView) findViewById(R.id.id);
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new
LinearLayoutManager(getApplicationContext()));
listItems = new ArrayList<>();
loadRecyclerViewData();
}
public void loadRecyclerViewData()
{
final String URL_DATA = "my url";
final StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_DATA, new Response.Listener<String>() {
@Override
public void onResponse(String s) {
try {
JSONObject jsonObject = new JSONObject(s);
JSONArray array = jsonObject.getJSONArray("");
for(int i=0;i<array.length();i++)
{
JSONObject o = array.getJSONObject(i);
ListItem_Ostan item = new ListItem_Ostan(o.getString("name"),o.getString("id"));
listItems.add(item);
}
adapter = new MyAdapter_Ostan(listItems,getApplicationContext());
recyclerView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
})
RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
requestQueue.add(stringRequest);
}
这是我的MyAdapter_ostan.java:
public class ListItem_Ostan {
private String id,name;
public ListItem_Ostan(String id, String name)
{
this.id = id;
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public class MyAdapter_Ostan extends RecyclerView.Adapter<MyAdapter_Ostan.ViewHolder> {
private List<ListItem_Ostan> listItems;
Context context;
public MyAdapter_Ostan(List<ListItem_Ostan> listItems, Context context) {
this.listItems = listItems;
this.context = context;
}
@Override
public MyAdapter_Ostan.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.layouts_ostan, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(final MyAdapter_Ostan.ViewHolder holder, int position) {
final ListItem_Ostan listItem = listItems.get(position);
LinearLayout linearLayout = holder.linearLayout;
holder.id.setText(listItem.getId());
holder.name.setText(listItem.getName());
final CardView cardView = holder.cardView;
}
@Override
public int getItemCount() {
return listItems.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView name,id;
LinearLayout linearLayout;
ArrayList<ListItem_Ostan> listItem = new ArrayList<ListItem_Ostan>();
CardView cardView;
Context context;
public TextView getName() {
return name;
}
public ViewHolder(View itemView)
{
super(itemView);
cardView = (CardView)itemView.findViewById(R.id.card_view);
name = (TextView)itemView.findViewById(R.id.name);
id = (TextView)itemView.findViewById(R.id.id);
}
有什么问题吗?我怎样才能修好它?请帮忙 你的Json
[{“id”:“1”,“姓名”:“悉尼”},{“id”:“2”,“姓名”:“设拉子”},{“id”:“3”,“姓名”:“东京”},{“id”:“4”,“姓名”:“德黑兰”}]
你可以这样试试
JSONArray jArray = new JSONArray(s);
for(i=0; i < jArray.length(); i++)
{
JSONObject jObject = jArray.getJSONObject(i);
String name = jObject.getString("name");
String id= jObject.getString("id");
System.out.println("id: " + i + " IntelliJ Amiya " + jObject.getString("id"));
ListItem_Ostan item = new ListItem_Ostan(name,id);
listItems.add(item);
}
JSONArray jArray=新的JSONArray;
对于(i=0;i
您的json字符串无效。json字符串始终以JsonObject而不是JsonArray ex.{“ss”:[]开头
请检查您的json是否有效
如下所示的有效json
{
"array_name": [{
"id": "1",
"name": "Sydney"
}, {
"id": "2",
"name": "Shiraz"
}, {
"id": "3",
"name": "Tokyo"
}, {
"id": "4",
"name": "Tehran"
}]
}
创建json Pojo类
请检查:
JSONObject jsonObject = new JSONObject(s);
JSONArray array = jsonObject.getJSONArray("");
到
listItems.size()
首先您是否尝试过:将您的json响应放在这里,我认为json解析是正确的wrong@IntelliJAmiyaWhere?适配器部分。logcat中是否有异常?抱歉。getJSONArray
Array名称不存在。Json有效。
JSONObject jsonObject = new JSONObject(s);
JSONArray array = jsonObject.getJSONArray("");
JSONObject jsonObject = new JSONObject(s);
JSONArray array = jsonObject.getJSONArray("array_name");