我正在从Android的MySQL数据库中检索数据，并且正在使用Recyclerview。我测试了php文件，它工作正常，但活动中没有任何显示。我检查了每件事，似乎还好，我不知道这是什么问题？
等待活动：
<android.support.v7.widget.RecyclerView
android:id="@+id/recylcerView"
android:layout_width="1dp"
android:layout_height="1dp"
tools:layout_editor_absoluteX="745dp"
tools:layout_editor_absoluteY="51dp" />
</RelativeLayout>
list_layout：
<?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"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<TextView
android:id="@+id/imageView"
android:layout_width="120dp"
android:layout_height="90dp"
android:padding="4dp"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
android:text=" Waiting Time :"
android:textColor="#000000"
android:textStyle="bold"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"/>
<TextView
android:id="@+id/textViewTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_toRightOf="@id/imageView"
android:text="00"
android:layout_marginTop="5dp"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
android:textColor="#000000" />
<TextView
android:id="@+id/textViewRating"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/textViewTime"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:layout_toRightOf="@id/imageView"
android:background="@color/colorPrimary"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:text="Bus Number : "
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small.Inverse"
android:textStyle="bold" />
<TextView
android:id="@+id/textViewBusNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/textViewRating"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:layout_toRightOf="@id/imageView"
android:text="255"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Large" />
</RelativeLayout>
</LinearLayout>
WaitingActivity：
public class WaitingActivity extends AppCompatActivity {
private static final String URL_PRODUCTS = "http://192.168.1.2/Android/v1/test1.php";
List<Product> productList;
RecyclerView recyclerView;
ProductsAdapter adapter ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_waiting);
recyclerView = (RecyclerView) findViewById(R.id.recylcerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
}
private void loadProducts() {
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_PRODUCTS,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONArray products = new JSONArray(response);
for (int i = 0; i < products.length(); i++) {
JSONObject productObject = products.getJSONObject(i);
int Temp_dt = productObject.getInt("Temp_dt");
int BusNumber =productObject.getInt("BusNumber");
Product product = new Product(Temp_dt, BusNumber);
productList.add(product);
}
adapter = new ProductsAdapter(WaitingActivity.this, productList);
recyclerView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(WaitingActivity.this, error.getMessage(),Toast.LENGTH_SHORT).show();
}
});
//adding our stringrequest to queue
Volley.newRequestQueue(this).add(stringRequest);
}
产品类别：
public class Product {
private int Temp_dt;
private int BusNumber;
public Product(int Temp_dt, int BusNumber) {
this.Temp_dt = Temp_dt;
this.BusNumber = BusNumber ;
}
public int getWaitingTime() {
return Temp_dt;
}
public int getBusNumber() {
return BusNumber ;
}
}
ProductAdapter：
public class ProductsAdapter extends
RecyclerView.Adapter<ProductsAdapter.ProductViewHolder> {
private Context mCtx;
private List<Product> productList;
public ProductsAdapter(Context mCtx, List<Product> productList) {
this.mCtx = mCtx;
this.productList = productList;
}
@Override
public ProductViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//inflating and returning our view holder
LayoutInflater inflater = LayoutInflater.from(mCtx);
View view = inflater.inflate(R.layout.list_layout, null);
return new ProductViewHolder(view);
}
@Override
public void onBindViewHolder(ProductViewHolder holder, int position) {
Product product = productList.get(position);
holder.textViewTime.setText(String.valueOf(product.getWaitingTime()));
holder.textViewBusNumber.setText(String.valueOf(product.getBusNumber()));
}
@Override
public int getItemCount() {
return productList.size();
}
class ProductViewHolder extends RecyclerView.ViewHolder {
TextView textViewTime;
TextView textViewBusNumber;
public ProductViewHolder(View itemView) {
super(itemView);
textViewTime = itemView.findViewById(R.id.textViewTime);
textViewBusNumber = itemView.findViewById(R.id.textViewBusNumber);
}
}
}
我希望从php文件显示temp_dt和等待时间，但实际输出只是空的活动。