我的recyclerview没有填充json这里是我的片段代码，其中包含recyclerview，我从php通过volley库获取json数据请帮帮我。我已发布片段代码，适配器代码以及我的应用程序的日志。
public String get_events="urlfordata";
public RequestQueue requestQueue;
public StringRequest stringRequest;
public String college_name;
public RecyclerView recyclerView;
public LinearLayoutManager llm;
public List<events> events = new ArrayList<events>();
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.events_home,container,false);
recyclerView = (RecyclerView) v.findViewById(R.id.neostat_home_recycleview);
SharedPreferences sha1 = getActivity().getSharedPreferences("user_data", Context.MODE_PRIVATE);
college_name = sha1.getString("college_name",null);
llm = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(llm);
requestQueue = Volley.newRequestQueue(getContext());
stringRequest = new StringRequest(Request.Method.POST, get_events, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
for (int i=0;i<jsonArray.length();i++)
{
JSONObject jsonObject = jsonArray.getJSONObject(i);
events = new ArrayList<>();
events.add(new events(jsonObject.getString("title"),jsonObject.getString("image")));
System.out.println(jsonObject.getString("title"));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String,String> hashMap = new HashMap<String,String>();
hashMap.put("college_name","");
return hashMap;
}
};
requestQueue.add(stringRequest);
events_adapter adapter = new events_adapter(events);
recyclerView.setAdapter(adapter);
return v;
}
}
我的适配器： -
import android.content.Context;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import java.util.List;
/**
* Created by cheta on 5/18/2016.
*/
public class events_adapter extends RecyclerView.Adapter<events_adapter.EventHolder> {
List<events> events;
events_adapter(List<events> events)
{
this.events =events;
}
@Override
public EventHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.event_cardview,parent,false);
EventHolder pvh = new EventHolder(v);
return pvh;
}
@Override
public void onBindViewHolder(EventHolder holder, int position) {
holder.textView.setText(events.get(position).title);
Context context = holder.imageView.getContext();
Picasso.with(context).load(events.get(position).image).fit().into(holder.imageView);
}
@Override
public int getItemCount() {
return events.size();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public static class EventHolder extends RecyclerView.ViewHolder
{
ImageView imageView;
TextView textView;
CardView cardView;
EventHolder(View v)
{
super(v);
cardView = (CardView) v.findViewById(R.id.events_home_cardview);
imageView = (ImageView) v.findViewById(R.id.events_home_image);
textView = (TextView) v.findViewById(R.id.events_home_title);
}
}
}
我的日志： -
05-18 20:56:41.538 26693-26693/com.ph.com.neostat W/System: ClassLoader referenced unknown path: /data/app/com.ph.com.neostat-1/lib/x86
05-18 20:56:41.598 26693-26703/com.ph.com.neostat I/art: Background sticky concurrent mark sweep GC freed 15897(1349KB) AllocSpace objects, 8(176KB) LOS objects, 72% free, 1026KB/3MB, paused 7.468ms total 52.247ms
05-18 20:56:41.741 26693-26693/com.ph.com.neostat W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
05-18 20:56:41.835 26693-26988/com.ph.com.neostat D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
[ 05-18 20:56:42.023 26693:26693 D/ ]
HostConnection::get() New Host Connection established 0xaa97fda0, tid 26693
[ 05-18 20:56:42.157 26693:26988 D/ ]
HostConnection::get() New Host Connection established 0xaec12aa0, tid 26988
05-18 20:56:42.355 26693-26988/com.ph.com.neostat I/OpenGLRenderer: Initialized EGL, version 1.4
05-18 20:56:43.596 26693-26988/com.ph.com.neostat W/EGL_emulation: eglSurfaceAttrib not implemented
05-18 20:56:43.596 26693-26988/com.ph.com.neostat W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xaa75e620, error=EGL_SUCCESS
05-18 20:56:43.784 26693-26693/com.ph.com.neostat I/Choreographer: Skipped 99 frames! The application may be doing too much work on its main thread.
05-18 20:56:45.295 26693-26693/com.ph.com.neostat I/Choreographer: Skipped 86 frames! The application may be doing too much work on its main thread.
05-18 20:56:45.621 26693-26699/com.ph.com.neostat W/art: Suspending all threads took: 38.568ms
05-18 20:57:25.469 26693-26988/com.ph.com.neostat W/EGL_emulation: eglSurfaceAttrib not implemented
05-18 20:57:25.470 26693-26988/com.ph.com.neostat W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xab27ec00, error=EGL_SUCCESS
05-18 20:57:27.763 26693-26988/com.ph.com.neostat E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb2eef960
05-18 20:57:36.429 26693-26988/com.ph.com.neostat W/EGL_emulation: eglSurfaceAttrib not implemented
05-18 20:57:36.429 26693-26988/com.ph.com.neostat W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xab27ef40, error=EGL_SUCCESS
05-18 20:57:37.093 26693-26988/com.ph.com.neostat E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb2eef8f0
05-18 20:57:43.260 26693-26699/com.ph.com.neostat W/art: Suspending all threads took: 79.213ms
--------- beginning of system
05-18 20:57:44.483 26693-26693/com.ph.com.neostat W/FragmentManager: moveToState: Fragment state for classified_home{9dbcc53 #0 id=0x7f0c006a android:switcher:2131492970:1} not updated inline; expected state 3 found 2
05-18 20:57:44.747 26693-26988/com.ph.com.neostat W/EGL_emulation: eglSurfaceAttrib not implemented
05-18 20:57:44.748 26693-26988/com.ph.com.neostat W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xab27ef60, error=EGL_SUCCESS
05-18 20:57:45.461 26693-26988/com.ph.com.neostat E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb2eef5e0
05-18 20:57:48.924 26693-26693/com.ph.com.neostat W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=561.48926, y[0]=977.46094, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=7782899, downTime=7776256, deviceId=0, source=0x1002 }
05-18 20:57:48.924 26693-26693/com.ph.com.neostat W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=561.48926, y[0]=977.46094, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=7782899, downTime=7776256, deviceId=0, source=0x1002 }
05-18 20:57:48.924 26693-26693/com.ph.com.neostat W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=561.48926, y[0]=977.46094, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=7782899, downTime=7776256, deviceId=0, source=0x1002 }
05-18 20:57:48.924 26693-26693/com.ph.com.neostat W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=561.48926, y[0]=977.46094, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=7782899, downTime=7776256, deviceId=0, source=0x1002 }
答案 0 :(得分：0)
正如塞尔文在评论中所说，请记住以下事项。
1。 events_adapter adapter = new events_adapter(events); - ，以便在获取数据（http响应）后为RecyclerView设置适配器，或者在此之前设置适配器，请致电adpter.notifyDataSetChanged();这样RecyclerView将刷新视图。
2。 events = new ArrayList<>(); in loop - 在每个循环上创建events对象，而您只想创建一次。
3。而不是System.out.println("blah blah blah");使用Android Logging API - Log
将以下更改改为onResponse方法
解决方案1
在发出请求或创建适配器实例之前调用此行events = new ArrayList<>();。
for (int i=0;i<jsonArray.length();i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
events.add(new events(jsonObject.getString("title"),jsonObject.getString("image")));
Log.i("TAG","Title "+jsonObject.getString("title"));
}
adapter.notifyDataSetChanged();
解决方案2
events = new ArrayList<>();
for (int i=0;i<jsonArray.length();i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
events.add(new events(jsonObject.getString("title"),jsonObject.getString("image")));
Log.i("TAG","Title "+jsonObject.getString("title"));
}
events_adapter adapter = new events_adapter(events);
recyclerView.setAdapter(adapter);