我需要一些关于Android Fragment中的添加功能的帮助。我不知道我做错了什么...很抱歉我对Java的知识有限......
当我点击提交按钮时，没有发生任何事情...我认为从onResponse方法开始出错了。
这些功能假设添加我有键入的记录，名称，价格和＆amp;对数据库的描述，如果记录成功添加，它将提醒用户＆＃34;产品成功添加＆＃34;否则会通知用户无法添加记录。
代码在活动页面上运行良好（我从我的注册帐户活动中复制代码），但在将其移动到片段页面时无效。
这是AddFragment.java
package ezms.ezms;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;
/**
* A simple {@link Fragment} subclass.
*/
public class AddFragment extends Fragment {
public AddFragment() {
// Required empty public constructor
}
EditText pName, pPrice, pDesc;
Button btn_addProduct;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_add, container, false);
pName = (EditText) view.findViewById(R.id.pName);
pPrice = (EditText) view.findViewById(R.id.pPrice);
pDesc = (EditText) view.findViewById(R.id.pDesc);
btn_addProduct = (Button) view.findViewById(R.id.btn_addProduct);
btn_addProduct.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final String name = pName.getText().toString();
final String price = pPrice.getText().toString();
final String desc = pDesc.getText().toString();
Response.Listener<String> responseListener = new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
boolean success = jsonResponse.getBoolean("success");
if (success) {
AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(AddFragment.this.getActivity());
myAlertDialog.setMessage("New Product Successfully Added.");
myAlertDialog.setPositiveButton("GOT IT", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
Toast.makeText(AddFragment.this.getActivity(), "New Product Successfully Added.", Toast.LENGTH_SHORT).show();
}
});
myAlertDialog.show();
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(AddFragment.this.getActivity());
builder.setMessage("Failed to Add Product.")
.setNegativeButton("RETRY", null)
.create()
.show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
AddProductRequest AddProductRequest = new AddProductRequest(name, price, desc, responseListener);
RequestQueue queue = Volley.newRequestQueue(AddFragment.this.getActivity());
queue.add(AddProductRequest);
}
});
return view;
}
}
这是AddProductRequest.java
package ezms.ezms;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;
import java.util.HashMap;
import java.util.Map;
public class AddProductRequest extends StringRequest {
private static final String ADD_REQUEST_URL = "http://www.pohqw.com/projects/myapp/add_product.php";
private Map<String, String> params;
// Constructor of this class
public AddProductRequest(String name, String price, String desc, Response.Listener<String> listener) {
super(Method.POST, ADD_REQUEST_URL, listener, null);
params = new HashMap<>();
params.put("name", name);
params.put("price", price);
params.put("desc", desc);
}
@Override
public Map<String, String> getParams() {
return params;
}
}
这是我在Android Studio上显示的错误消息..
05-09 13:12:47.004 10674-12581/? I/System.out: [CDS]rx timeout:1
05-09 13:12:47.004 10674-12581/? I/System.out: [CDS]rx timeout:2500
05-09 13:12:47.004 10674-12581/? I/System.out: Close in OkHttp:0
05-09 13:12:47.004 10674-12581/? I/System.out: [CDS]close[38156]
05-09 13:12:47.004 10674-12581/? D/libc-netbsd: [getaddrinfo]: hostname=www.pohqw.com; servname=(null); cache_mode=(null), netid=0; mark=0
05-09 13:12:47.005 10674-12581/? D/libc-netbsd: [getaddrinfo]: ai_addrlen=0; ai_canonname=(null); ai_flags=4; ai_family=0
05-09 13:12:47.005 10674-12581/? D/libc-netbsd: [getaddrinfo]: hostname=www.pohqw.com; servname=(null); cache_mode=(null), netid=0; mark=0
05-09 13:12:47.005 10674-12581/? D/libc-netbsd: [getaddrinfo]: ai_addrlen=0; ai_canonname=(null); ai_flags=1024; ai_family=0
05-09 13:12:47.007 10674-12581/? D/libc-netbsd: getaddrinfo: www.pohqw.com get result from proxy >>
05-09 13:12:47.007 10674-12581/? I/System.out: propertyValue:true
05-09 13:12:47.008 10674-12581/? I/System.out: [CDS]rx timeout:2500
05-09 13:12:47.009 10674-12581/? I/System.out: [socket][5] connection www.pohqw.com/202.75.56.237:80;LocalPort=58216(2500)
05-09 13:12:47.009 10674-12581/? I/System.out: [CDS]connect[www.pohqw.com/202.75.56.237:80] tm:2
05-09 13:12:47.010 10674-12581/? D/Posix: [Posix_connect Debug]Process ezms.ezms :80
05-09 13:12:47.066 10674-12581/? I/System.out: [socket][/192.168.1.34:58216] connected
05-09 13:12:47.067 10674-12581/? I/System.out: [OkHttp] sendRequest>>
05-09 13:12:47.067 10674-12581/? I/System.out: [OkHttp] sendRequest<<
05-09 13:12:47.385 10674-10674/? W/System.err: org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
05-09 13:12:47.385 10674-10674/? W/System.err: at org.json.JSON.typeMismatch(JSON.java:111)
05-09 13:12:47.385 10674-10674/? W/System.err: at org.json.JSONObject.<init>(JSONObject.java:160)
05-09 13:12:47.385 10674-10674/? W/System.err: at org.json.JSONObject.<init>(JSONObject.java:173)
05-09 13:12:47.385 10674-10674/? W/System.err: at ezms.ezms.AddFragment$1$1.onResponse(AddFragment.java:59)
05-09 13:12:47.385 10674-10674/? W/System.err: at ezms.ezms.AddFragment$1$1.onResponse(AddFragment.java:55)
05-09 13:12:47.385 10674-10674/? W/System.err: at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
05-09 13:12:47.385 10674-10674/? W/System.err: at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
05-09 13:12:47.385 10674-10674/? W/System.err: at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
05-09 13:12:47.385 10674-10674/? W/System.err: at android.os.Handler.handleCallback(Handler.java:815)
05-09 13:12:47.385 10674-10674/? W/System.err: at android.os.Handler.dispatchMessage(Handler.java:104)
05-09 13:12:47.385 10674-10674/? W/System.err: at android.os.Looper.loop(Looper.java:194)
05-09 13:12:47.385 10674-10674/? W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5546)
05-09 13:12:47.385 10674-10674/? W/System.err: at java.lang.reflect.Method.invoke(Native Method)
05-09 13:12:47.385 10674-10674/? W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
05-09 13:12:47.385 10674-10674/? W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:964)
05-09 13:12:47.385 10674-10674/? W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)
答案 0 :(得分：0)
显然，当我尝试你的URL POST时，我得到了这个：
警告：mysqli_stmt_bind_param（）要求参数1为mysqli_stmt，第9行/home/pohqw/public_html/projects/myapp/add_product.php中给出布尔值
警告：mysqli_stmt_execute（）要求参数1为mysqli_stmt，第10行/home/pohqw/public_html/projects/myapp/add_product.php中给出布尔值 {＆＃34;成功＆＃34;：真}
似乎您的警告会与您的{"success":true}
答案 1 :(得分：-1)
尝试替换
行 RequestQueue queue = Volley.newRequestQueue(AddFragment.this.getActivity());
与
RequestQueue queue = Volley.newRequestQueue(getActivity().getApplicationContext());