我的数据显示在logcat中，但在打开应用时没有显示任何内容。您可以进一步查看here.但我发现了一个问题＆＃34;没有附加适配器：跳过布局＆＃34;有这个问题的任何想法吗？
这是我的 MainActivity xml文件：
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:card_view="http://schemas.android.com/tools">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
card_view:cardUseCompatPadding="true"
card_view:cardElevation="5dp"
card_view:cardCornerRadius="5dp">
</android.support.v7.widget.RecyclerView>
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:indeterminateTint="@color/colorPrimary" />
</RelativeLayout>
CardView xml文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:card_view="http://schemas.android.com/apk/res-auto">
<android.support.v7.widget.CardView
android:id="@+id/card_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:elevation="3dp"
card_view:cardUseCompatPadding="true"
card_view:cardElevation="5dp"
card_view:cardCornerRadius="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton android:id="@+id/imagebtn"
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="?attr/selectableItemBackgroundBorderless"
android:clickable="true"
android:scaleType="centerCrop" />
<TextView android:id="@+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:layout_below="@+id/imagebtn"
android:padding="5dp"
android:textColor="#000"
android:gravity="center"
android:text="Hospital Name"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
MainActivity java类文件：
public class MainActivity extends AppCompatActivity implements
ExampleAdapter.OnItemClickListener {
public static final String EXTRA_CREATOR = "orga_organame";
public static final String EXTRA_URL =
"http://xelwel.com.np/hamrosewaapp/uploads/images/logo/civil.png";
private RecyclerView mRecyclerview;
private ExampleAdapter mExampleAdapter;
private List<UserInfo> mExampleList;
private RequestQueue mRequestQueue;
ImageButton imageButton;
TextView textView;
ProgressBar progressbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressbar = findViewById(R.id.progressBar);
progressbar.setVisibility(View.VISIBLE);
imageButton = findViewById(R.id.imagebtn);
textView = findViewById(R.id.description);
mRecyclerview = findViewById(R.id.recycler_view);
mRecyclerview.setHasFixedSize(true);
mRecyclerview.setLayoutManager(new LinearLayoutManager(this));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(this);
jsonParse();
}
public void jsonParse() {
final String url =
("http://xelwel.com.np/hamrosewaapp/api/get_organization_list");
final StringRequest request = new StringRequest(Request.Method.POST,
url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.i("response", url + "response:" + response);
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray jsonArray = jsonObject.getJSONArray("org_list");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject obj = jsonArray.getJSONObject(i);
String hsname = obj.getString("orga_organame");
String image = obj.getString("logo_path" + "civil.png");
mExampleList.add(new UserInfo(hsname, image));
}
mExampleAdapter = new ExampleAdapter(MainActivity.this,
mExampleList);
mRecyclerview.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(MainActivity.this);
progressbar.setVisibility(View.GONE);
} catch (JSONException e) {
Toast.makeText(getApplicationContext(),"Error Parsing Data",
Toast.LENGTH_LONG);
e.printStackTrace();
}catch (Exception e) {
Toast.makeText(getApplicationContext(),"Something went
wrong", Toast.LENGTH_LONG);
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("api_key", "123456789");
return params;
}
};
mRequestQueue.add(request);
}
@Override
public void onItemClick(int position) {
Intent detailIntent = new Intent(this, DetailActivity.class);
UserInfo clickedItem = mExampleList.get(position);
detailIntent.putExtra(EXTRA_URL, clickedItem.getImage_link());
detailIntent.putExtra(EXTRA_CREATOR, clickedItem.getName());
startActivity(detailIntent);
}
}
DetailActivity java类文件：
Intent intent = getIntent();
String imageUrl = intent.getStringExtra(EXTRA_URL);
String name = intent.getStringExtra(EXTRA_CREATOR);
ImageView imageView = findViewById(R.id.image_view_detail);
TextView textView = findViewById(R.id.text_view);
Picasso.with(this).load(imageUrl).fit().centerInside().into(imageView);
textView.setText(name);
ExampleAdapter java类文件：
public class ExampleAdapter extends
RecyclerView.Adapter<ExampleAdapter.ViewHolder> {
private Context mcontext;
private List<UserInfo> mExampleList;
private OnItemClickListener mListener;
public interface OnItemClickListener{
void onItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener){
mListener = listener;
}
public ExampleAdapter(Context context, List<UserInfo> list) {
mcontext = context;
mExampleList = list;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView =
LayoutInflater.from(mcontext).inflate(R.layout.cardview,parent,false);
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
UserInfo info = mExampleList.get(position);
String imageUrl = info.getImage_link();
String hsname = info.getName();
holder.textView.setText(hsname);
Picasso.with(mcontext).load(imageUrl).fit().centerInside().
into(holder.imageView);
}
@Override
public int getItemCount() {
return mExampleList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView textView;
public ImageView imageView;
public ViewHolder(View itemView) {
super(itemView);
textView = (TextView) itemView.findViewById(R.id.description);
imageView = (ImageView) itemView.findViewById(R.id.image);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(mListener!= null){
int position = getAdapterPosition();
if (position!= RecyclerView.NO_POSITION){
mListener.onItemClick(position);
}
}
}
});
}
}
}
UserInfo java类文件：
public class UserInfo {
public String id, name, image_link;
public UserInfo(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 image_link;
}
public void setName(String image_link) {
this.image_link = image_link;
}
public String getImage_link() {
return image_link;
}
public void setImage_link(String image_link) {
this.image_link = image_link;
}
}
这些是与这些问题相关的总代码。请通过一些特定的解决方案查看代码和响应...
答案 0 :(得分：0)
试试这个
你在UserInfo类构造函数中犯了错误。
你添加了
mExampleList.add(new UserInfo(hsname, image));
但是这里设置了id和name
public UserInfo(String id, String name) {
this.id = id;
this.name = name;
}
更改您的构造函数
public UserInfo(String name, String image_link) {
this.image_link = image_link;
this.name = name;
}
您没有在image_link变量中设置任何值，但在适配器类中访问
UserInfo info = mExampleList.get(position);
String imageUrl = info.getImage_link();
String hsname = info.getName();
答案 1 :(得分：0)
试试这个
try {
JSONObject jsonObject = new JSONObject(response);
String logoURL = jsonObject.getString("logo_path")
JSONArray jsonArray = jsonObject.getJSONArray("org_list");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject obj = jsonArray.getJSONObject(i);
String hsname = obj.getString("orga_organame");
String imageurl = obj.getString("orga_image");
String image = logoURL +"/"+ imageurl ;
mExampleList.add(new UserInfo(hsname, image));
}
}