错误：如何将Cardview插入回收站片段布局
[英]Error: How to insert cardview into recycler fragment layout
问题描述
大家好，我目前正在研究如何解析JSON并在Android中使用RecyclerView和CardView显示。 我不明白为什么卡片视图未显示在回收者视图布局中。 有人遇到过这个问题吗？ 谢谢
news_layout.xml（片段布局）
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:id="@+id/recyclerview"
android:clickable="true"
android:focusable="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
recycle.news.xml（cardview布局）
<android.support.v7.widget.CardView
xmlns:android="https://schemas.android.com/apk/res/android"
xmlns:android2="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="https://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/card_view"
android:layout_width="match_parent"
android2:layout_marginTop="5dp"
android2:layout_marginLeft="5dp"
android2:layout_marginRight="5dp"
android2:layout_gravity="center|top"
card_view:cardPreventCornerOverlap="false"
card_view:cardCornerRadius="20dp"
android2:layout_width="match_parent"
android2:layout_height="wrap_content">
<FrameLayout
android2:layout_width="match_parent"
android2:layout_height="400dp"
app:cardElevation="0dp"
android2:background="@drawable/cardviewstring">
<LinearLayout
android2:orientation="vertical"
android2:layout_width="380dp"
android2:layout_height="match_parent"
android2:weightSum="1"
android2:layout_marginRight="20dp">
<LinearLayout
android2:orientation="vertical"
android2:layout_width="match_parent"
android2:layout_weight="1"
android2:layout_height="250dp">
<ImageView
android2:layout_width="match_parent"
android2:layout_height="match_parent"
app:srcCompat="@mipmap/ic_launcher"
android2:id="@+id/imageView4" />
</LinearLayout>
<LinearLayout
android2:orientation="vertical"
android2:layout_width="match_parent"
android2:layout_height="wrap_content"
android2:paddingTop="25dp">
<ScrollView
android2:layout_width="match_parent"
android2:layout_height="84dp"
android2:background="@drawable/screen_background_dark_transparent"
android2:layout_marginLeft="3dp">
<LinearLayout
android2:layout_width="match_parent"
android2:layout_height="wrap_content"
android2:orientation="vertical" >
<TextView
android2:text="TextView"
android2:layout_width="match_parent"
android2:layout_height="wrap_content"
android2:id="@+id/textView4" />
<TextView
android2:text="TextView"
android2:layout_width="match_parent"
android2:layout_height="35dp"
android2:id="@+id/textView3" />
</LinearLayout>
</ScrollView>
</LinearLayout>
<LinearLayout
android2:orientation="vertical"
android2:layout_marginTop="10dp"
android2:layout_width="match_parent"
android2:layout_height="42dp"
android:layout_alignParentBottom="true">
<LinearLayout
android2:orientation="horizontal"
android2:layout_width="match_parent"
android2:layout_height="match_parent">
<ImageView
android2:layout_width="wrap_content"
android2:layout_height="wrap_content"
app:srcCompat="@drawable/ic_share"
android2:id="@+id/imageView3"
android2:layout_weight="1" />
<ImageView
android2:layout_width="wrap_content"
android2:layout_height="wrap_content"
app:srcCompat="@drawable/ic_like"
android2:id="@+id/imageView2"
android2:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</FrameLayout>
</android.support.v7.widget.CardView>
NewsFragment.java
package com.androidbelieve.drawerwithswipetabs;
import android.app.LauncherActivity;
import android.graphics.Movie;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
/**
* Created by Ratan on 7/29/2015.
*/
public class NewsFragment extends Fragment {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private GridLayoutManager gridLayoutManager;
private newsAdapter nAdapter;
private List<listnews> data_list;
private JsonArrayRequest jsonArrayRequest;
private RequestQueue requestQueue;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.news_layout,container,false);
mRecyclerView =(RecyclerView)view.findViewById(R.id.recyclerview);
mRecyclerView.setHasFixedSize(true);
data_list = new ArrayList<>();
load_data_from_server(0);
mRecyclerView.setHasFixedSize(true);
gridLayoutManager = new GridLayoutManager(getActivity(),2);
mRecyclerView.setLayoutManager(gridLayoutManager);
nAdapter = new newsAdapter(getActivity(),data_list);
mRecyclerView.setAdapter(nAdapter);
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if(gridLayoutManager.findLastCompletelyVisibleItemPosition() == data_list.size()-1)
{
load_data_from_server(data_list.get(data_list.size()-1).getNews_id());
}
}
});
return view;
private void load_data_from_server(final int id)
{
AsyncTask<Integer, Void, Void> task = new AsyncTask<Integer, Void, Void>() {
@Override
protected Void doInBackground(Integer... params) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("http://192.168.107.1/ibmcoe_la/selected.php?id="+params[0])
.build();
try{
Response response = client.newCall(request).execute();
JSONArray array = new JSONArray(response.body().string());
for(int i=0; i<array.length(); i++)
{
JSONObject object = array.getJSONObject(i);
listnews data = new listnews(object.getInt("news_id"),object.getString("path_image"),object.getString("news_image")
,object.getString("news_title"),object.getString("news_description")
);
data_list.add(data);
}
}catch (IOException e){
e.printStackTrace();
}catch (JSONException e){
System.out.println("End of content");
}
return null;
}
protected void onPostExecute(Void avoid){
nAdapter.notifyDataSetChanged();
}
};
task.execute(id);
}
@Override
public String toString()
{
return "NewsFragment";
}
}
newsAdapter.java
package com.androidbelieve.drawerwithswipetabs;
import android.content.Context;
import android.provider.ContactsContract;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
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.bumptech.glide.Glide;
import java.util.ArrayList;
import java.util.List;
/**
* Created by LENOVO on 20/2/2017.
*/
public class newsAdapter extends RecyclerView.Adapter<newsAdapter.ViewHolder> {
private Context context;
private List<listnews> my_data;
public newsAdapter(Context context, List<listnews> my_data)
{
this.context = context;
this.my_data = my_data;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycle_news,parent,false);
// ViewHolder viewHolder = new ViewHolder(view);
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.description.setText(my_data.get(position).getNews_description());
Glide.with(context).load(my_data.get(position).getPath_image()).into(holder.dataimage);
}
@Override
public int getItemCount()
{
if(my_data !=null)
{
return my_data.size();
}
return 0;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView description;
public TextView imagetitle;
public ImageView dataimage;
public ViewHolder(View itemView) {
super(itemView);
description = (TextView) itemView.findViewById(R.id.textView3);
imagetitle = (TextView) itemView.findViewById(R.id.textView4);
dataimage = (ImageView) itemView.findViewById(R.id.imageView4);
}
}
}
listnews.java
package com.androidbelieve.drawerwithswipetabs;
import java.io.Serializable;
/**
* Created by LENOVO on 21/2/2017.
*/
public class listnews implements Serializable {
public int news_id;
public String path_image, news_image, news_title, news_description;
public listnews(int news_id, String path_image, String news_image, String news_title, String news_description) {
this.news_id = news_id;
this.path_image = path_image;
this.news_image = news_image;
this.news_title = news_title;
this.news_description = news_description;
}
public int getNews_id() {
return news_id;
}
public void setNews_id(int news_id) {
this.news_id = news_id;
}
public String getPath_image() {
return path_image;
}
public void setPath_image(String path_image) {
this.path_image = path_image;
}
public String getNews_image() {
return news_image;
}
public void setNews_image(String news_image) {
this.news_image = news_image;
}
public String getNews_title() {
return news_title;
}
public void setNews_title(String news_title) {
this.news_title = news_title;
}
public String getNews_description() {
return news_description;
}
public void setNews_description(String news_description) {
this.news_description = news_description;
}
}
数据库结构
**localhost Server Response (get JSON)**
http://192.168.107.1/ibmcoe_la/selected.php?id
{
"server_response": [
{
"news_id": "25",
"path_image": "http://localhost/ibmcoe_la/images/lonesky.jpg",
"news_title": "lonesky.jpg",
"news_description": "testttttt",
"news_timepost": "17.03.01 15:34:53"
},
{
"news_id": "23",
"path_image": "http://localhost/ibmcoe_la/images/ump-ios-01.jpg",
"news_title": "ump-ios-01.jpg",
"news_description": "5455454",
"news_timepost": "17.02.22 15:24:07"
},
{
"news_id": "22",
"path_image": "http://localhost/ibmcoe_la/images/fccc9dc81940317b7881c2be7f5c94c4.jpg",
"news_title": "fccc9dc81940317b7881c2be7f5c94c4.jpg",
"news_description": "21",
"news_timepost": "17.02.22 15:23:10"
},
{
"news_id": "19",
"path_image": "http://localhost/ibmcoe_la/images/logo-rasmi-ump-(logo-sahaja).png",
"news_title": "logo-rasmi-ump-(logo-sahaja).png",
"news_description": "qqqq",
"news_timepost": "17.02.22 15:10:04"
},
{
"news_id": "5",
"path_image": "http://localhost/ibmcoe_la/images/Koala.jpg",
"news_title": "Koala.jpg",
"news_description": "e",
"news_timepost": "17.02.22 10:40:32"
},
{
"news_id": "4",
"path_image": "http://localhost/ibmcoe_la/images/Tulips.jpg",
"news_title": "Tulips.jpg",
"news_description": "c",
"news_timepost": "17.02.22 10:22:54"
},
{
"news_id": "2",
"path_image": "http://localhost/ibmcoe_la/images/Chrysanthemum.jpg",
"news_title": "Chrysanthemum.jpg",
"news_description": "d",
"news_timepost": "17.02.22 10:16:23"
},
{
"news_id": "18",
"path_image": "http://localhost/ibmcoe_la/images/fccc9dc81940317b7881c2be7f5c94c4.jpg",
"news_title": "fccc9dc81940317b7881c2be7f5c94c4.jpg",
"news_description": "q",
"news_timepost": "17.02.22 03:08:28"
},
{
"news_id": "17",
"path_image": "http://localhost/ibmcoe_la/images/galaxy-pictures-6.jpg",
"news_title": "galaxy-pictures-6.jpg",
"news_description": "1",
"news_timepost": "17.02.22 02:39:56"
},
{
"news_id": "16",
"path_image": "http://localhost/ibmcoe_la/images/PicIBM.png",
"news_title": "PicIBM.png",
"news_description": "2",
"news_timepost": "17.02.22 02:37:56"
},
{
"news_id": "15",
"path_image": "http://localhost/ibmcoe_la/images/PicIBM.png",
"news_title": "PicIBM.png",
"news_description": "2",
"news_timepost": "17.02.22 02:37:45"
},
{
"news_id": "14",
"path_image": "http://localhost/ibmcoe_la/images/PicIBM.png",
"news_title": "PicIBM.png",
"news_description": "2",
"news_timepost": "17.02.22 02:33:38"
},
{
"news_id": "13",
"path_image": "http://localhost/ibmcoe_la/images/testin123.jpg",
"news_title": "testin123.jpg",
"news_description": "1",
"news_timepost": "17.02.22 02:30:08"
},
{
"news_id": "1",
"path_image": "http://localhost/ibmcoe_la/images/Penguins.jpg",
"news_title": "Penguins.jpg",
"news_description": "testing",
"news_timepost": "17.02.21 04:49:32"
}
]
}
2 个解决方案
解决方案1
0 2017-03-07 08:44:54
我认为您可以尝试这样：
JSONObject jsonObject= new JSONObject(response.body().string());
JSONArray array = jsonObject.getJSONArray("server_response");
for(int i=0; i<array.length(); i++)
{
JSONObject object = array.getJSONObject(i);
listnews data = new listnews(object.getInt("news_id"),object.getString("path_image"),object.getString("news_image")
,object.getString("news_title"),object.getString("news_description")
);
data_list.add(data);
}
解决方案2
0 2017-03-07 09:10:01
尝试一下，尝试在CardView上方插入线性布局，并在cardView上放一些标高，看它是否会出现：
<LinearLayout
xmlns:android="https://schemas.android.com/apk/res/android"
xmlns:android2="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="https://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orienatation="vertical"
android2:layout_height="wrap_content"
>
<android.support.v7.widget.CardView
android:id="@+id/card_view"
android:layout_width="match_parent"
android2:layout_marginTop="5dp"
android2:layout_marginLeft="5dp"
android2:layout_marginRight="5dp"
android2:layout_gravity="center|top"
card_view:cardPreventCornerOverlap="false"
card_view:cardCornerRadius="20dp"
app:elevation="5dp"
android2:layout_width="match_parent"
android2:layout_height="wrap_content">
<FrameLayout
android2:layout_width="match_parent"
android2:layout_height="400dp"
app:cardElevation="0dp"
android2:background="@drawable/cardviewstring">
<LinearLayout
android2:orientation="vertical"
android2:layout_width="380dp"
android2:layout_height="match_parent"
android2:weightSum="1"
android2:layout_marginRight="20dp">
<LinearLayout
android2:orientation="vertical"
android2:layout_width="match_parent"
android2:layout_weight="1"
android2:layout_height="250dp">
<ImageView
android2:layout_width="match_parent"
android2:layout_height="match_parent"
app:srcCompat="@mipmap/ic_launcher"
android2:id="@+id/imageView4" />
</LinearLayout>
<LinearLayout
android2:orientation="vertical"
android2:layout_width="match_parent"
android2:layout_height="wrap_content"
android2:paddingTop="25dp">
<ScrollView
android2:layout_width="match_parent"
android2:layout_height="84dp"
android2:background="@drawable/screen_background_dark_transparent"
android2:layout_marginLeft="3dp">
<LinearLayout
android2:layout_width="match_parent"
android2:layout_height="wrap_content"
android2:orientation="vertical" >
<TextView
android2:text="TextView"
android2:layout_width="match_parent"
android2:layout_height="wrap_content"
android2:id="@+id/textView4" />
<TextView
android2:text="TextView"
android2:layout_width="match_parent"
android2:layout_height="35dp"
android2:id="@+id/textView3" />
</LinearLayout>
</ScrollView>
</LinearLayout>
<LinearLayout
android2:orientation="vertical"
android2:layout_marginTop="10dp"
android2:layout_width="match_parent"
android2:layout_height="42dp"
android:layout_alignParentBottom="true">
<LinearLayout
android2:orientation="horizontal"
android2:layout_width="match_parent"
android2:layout_height="match_parent">
<ImageView
android2:layout_width="wrap_content"
android2:layout_height="wrap_content"
app:srcCompat="@drawable/ic_share"
android2:id="@+id/imageView3"
android2:layout_weight="1" />
<ImageView
android2:layout_width="wrap_content"
android2:layout_height="wrap_content"
app:srcCompat="@drawable/ic_like"
android2:id="@+id/imageView2"
android2:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</FrameLayout>
</android.support.v7.widget.CardView>
<LinearLayout/>
回收站视图：未连接适配器； 跳过布局（API 的回收站视图中的错误）
[英]Recycler view: no adapter attached; skipping layout(Error in recycler view for API )
如何使用cardview和adapter向recyclerview布局添加按钮？
[英]How to add a button into a recyclerview layout with cardview and adapter?
无法获取 Cardview、E/RecyclerView：未连接适配器； 跳过布局错误，如何将适配器添加到 recyclerView？
[英]Unable to get the Cardview, E/RecyclerView: No adapter attached; skipping layout error , how to add adapter to recyclerView?
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