Xamarin 绑定错误 CS0534：'HttpGetRequest' 未实现继承的抽象成员 'AsyncTask.DoInBackground(params Object[]?)'
Xamarin Binding Error CS0534: 'HttpGetRequest' does not implement inherited abstract member 'AsyncTask.DoInBackground(params Object[]?)'
我想在我的 Xamarin.Android 项目中使用 Triton Digital Mobile SDK。
创建绑定库并尝试构建它后，出现此错误：
error CS0534: 'HttpGetRequest' does not implement inherited abstract member 'AsyncTask.DoInBackground(params Object[]?)'
我使用 decompiler :
检查了 HttpGetRequest 的内容
package com.tritondigital.util;
import android.os.AsyncTask;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpGetRequest extends AsyncTask<String, Void, String> {
public static final String REQUEST_METHOD = "GET";
public static final int READ_TIMEOUT = 15000;
public static final int CONNECTION_TIMEOUT = 15000;
protected String doInBackground(String... params) {
String result, stringUrl = params[0];
try {
URL myUrl = new URL(stringUrl);
HttpURLConnection connection = (HttpURLConnection)myUrl.openConnection();
connection.setRequestMethod("GET");
connection.setReadTimeout(15000);
connection.setConnectTimeout(15000);
connection.connect();
connection.getResponseCode();
InputStreamReader streamReader = new InputStreamReader(connection.getInputStream());
BufferedReader reader = new BufferedReader(streamReader);
StringBuilder stringBuilder = new StringBuilder();
String inputLine;
while ((inputLine = reader.readLine()) != null)
stringBuilder.append(inputLine);
reader.close();
streamReader.close();
result = stringBuilder.toString();
} catch (IOException e) {
result = null;
}
return result;
}
protected void onPostExecute(String result) {
super.onPostExecute(result);
}
}
这是 Xamarin 绑定库出错的文件内容：
using System;
using System.Collections.Generic;
using Android.Runtime;
using Java.Interop;
namespace Com.Tritondigital.Util {
// Metadata.xml XPath class reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']"
[global::Android.Runtime.Register ("com/tritondigital/util/HttpGetRequest", DoNotGenerateAcw=true)]
public partial class HttpGetRequest : global::Android.OS.AsyncTask {
// Metadata.xml XPath field reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/field[@name='CONNECTION_TIMEOUT']"
[Register ("CONNECTION_TIMEOUT")]
public const int ConnectionTimeout = (int) 15000;
// Metadata.xml XPath field reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/field[@name='READ_TIMEOUT']"
[Register ("READ_TIMEOUT")]
public const int ReadTimeout = (int) 15000;
// Metadata.xml XPath field reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/field[@name='REQUEST_METHOD']"
[Register ("REQUEST_METHOD")]
public const string RequestMethod = (string) "GET";
static readonly JniPeerMembers _members = new XAPeerMembers ("com/tritondigital/util/HttpGetRequest", typeof (HttpGetRequest));
internal static IntPtr class_ref {
get { return _members.JniPeerType.PeerReference.Handle; }
}
[global::System.Diagnostics.DebuggerBrowsable (global::System.Diagnostics.DebuggerBrowsableState.Never)]
[global::System.ComponentModel.EditorBrowsable (global::System.ComponentModel.EditorBrowsableState.Never)]
public override global::Java.Interop.JniPeerMembers JniPeerMembers {
get { return _members; }
}
[global::System.Diagnostics.DebuggerBrowsable (global::System.Diagnostics.DebuggerBrowsableState.Never)]
[global::System.ComponentModel.EditorBrowsable (global::System.ComponentModel.EditorBrowsableState.Never)]
protected override IntPtr ThresholdClass {
get { return _members.JniPeerType.PeerReference.Handle; }
}
[global::System.Diagnostics.DebuggerBrowsable (global::System.Diagnostics.DebuggerBrowsableState.Never)]
[global::System.ComponentModel.EditorBrowsable (global::System.ComponentModel.EditorBrowsableState.Never)]
protected override global::System.Type ThresholdType {
get { return _members.ManagedPeerType; }
}
protected HttpGetRequest (IntPtr javaReference, JniHandleOwnership transfer) : base (javaReference, transfer)
{
}
// Metadata.xml XPath constructor reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/constructor[@name='HttpGetRequest' and count(parameter)=0]"
[Register (".ctor", "()V", "")]
public unsafe HttpGetRequest () : base (IntPtr.Zero, JniHandleOwnership.DoNotTransfer)
{
const string __id = "()V";
if (((global::Java.Lang.Object) this).Handle != IntPtr.Zero)
return;
try {
var __r = _members.InstanceMethods.StartCreateInstance (__id, ((object) this).GetType (), null);
SetHandle (__r.Handle, JniHandleOwnership.TransferLocalRef);
_members.InstanceMethods.FinishCreateInstance (__id, this, null);
} finally {
}
}
static Delegate cb_doInBackground_arrayLjava_lang_String_;
#pragma warning disable 0169
static Delegate GetDoInBackground_arrayLjava_lang_String_Handler ()
{
if (cb_doInBackground_arrayLjava_lang_String_ == null)
cb_doInBackground_arrayLjava_lang_String_ = JNINativeWrapper.CreateDelegate ((_JniMarshal_PPL_L) n_DoInBackground_arrayLjava_lang_String_);
return cb_doInBackground_arrayLjava_lang_String_;
}
static IntPtr n_DoInBackground_arrayLjava_lang_String_ (IntPtr jnienv, IntPtr native__this, IntPtr native__params)
{
var __this = global::Java.Lang.Object.GetObject<global::Com.Tritondigital.Util.HttpGetRequest> (jnienv, native__this, JniHandleOwnership.DoNotTransfer);
var @params = (string[]) JNIEnv.GetArray (native__params, JniHandleOwnership.DoNotTransfer, typeof (string));
IntPtr __ret = JNIEnv.NewString (__this.DoInBackground (@params));
if (@params != null)
JNIEnv.CopyArray (@params, native__params);
return __ret;
}
#pragma warning restore 0169
// Metadata.xml XPath method reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/method[@name='doInBackground' and count(parameter)=1 and parameter[1][@type='java.lang.String...']]"
[Register ("doInBackground", "([Ljava/lang/String;)Ljava/lang/String;", "GetDoInBackground_arrayLjava_lang_String_Handler")]
protected virtual unsafe string DoInBackground (params string[] @params)
{
const string __id = "doInBackground.([Ljava/lang/String;)Ljava/lang/String;";
IntPtr native__params = JNIEnv.NewArray (@params);
try {
JniArgumentValue* __args = stackalloc JniArgumentValue [1];
__args [0] = new JniArgumentValue (native__params);
var __rm = _members.InstanceMethods.InvokeVirtualObjectMethod (__id, this, __args);
return JNIEnv.GetString (__rm.Handle, JniHandleOwnership.TransferLocalRef);
} finally {
if (@params != null) {
JNIEnv.CopyArray (native__params, @params);
JNIEnv.DeleteLocalRef (native__params);
}
global::System.GC.KeepAlive (@params);
}
}
static Delegate cb_onPostExecute_Ljava_lang_String_;
#pragma warning disable 0169
static Delegate GetOnPostExecute_Ljava_lang_String_Handler ()
{
if (cb_onPostExecute_Ljava_lang_String_ == null)
cb_onPostExecute_Ljava_lang_String_ = JNINativeWrapper.CreateDelegate ((_JniMarshal_PPL_V) n_OnPostExecute_Ljava_lang_String_);
return cb_onPostExecute_Ljava_lang_String_;
}
static void n_OnPostExecute_Ljava_lang_String_ (IntPtr jnienv, IntPtr native__this, IntPtr native_result)
{
var __this = global::Java.Lang.Object.GetObject<global::Com.Tritondigital.Util.HttpGetRequest> (jnienv, native__this, JniHandleOwnership.DoNotTransfer);
var result = JNIEnv.GetString (native_result, JniHandleOwnership.DoNotTransfer);
__this.OnPostExecute (result);
}
#pragma warning restore 0169
// Metadata.xml XPath method reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/method[@name='onPostExecute' and count(parameter)=1 and parameter[1][@type='java.lang.String']]"
[Register ("onPostExecute", "(Ljava/lang/String;)V", "GetOnPostExecute_Ljava_lang_String_Handler")]
protected virtual unsafe void OnPostExecute (string result)
{
const string __id = "onPostExecute.(Ljava/lang/String;)V";
IntPtr native_result = JNIEnv.NewString (result);
try {
JniArgumentValue* __args = stackalloc JniArgumentValue [1];
__args [0] = new JniArgumentValue (native_result);
_members.InstanceMethods.InvokeVirtualVoidMethod (__id, this, __args);
} finally {
JNIEnv.DeleteLocalRef (native_result);
}
}
}
}
关于如何解决这个问题有什么想法吗？
您可以打开Transforms文件夹下的Metadata.xml，添加如下代码：
<add-node path="/api/package[@name='com.tritondigital.util']">
<class abstract="false" deprecated="not deprecated" final="false" name="HttpGetRequest" static="true" visibility="public" extends="java.lang.Object"/>
</add-node>
此外，您可以查看类似案例并阅读有关绑定的文档。
案例：error CS0534: [java class] does not implement inherited abstract member 'AsyncTask.DoInBackground(params Object[])'
文档：https://gist.github.com/JonDouglas/dda6d8ace7d071b0e8cb#common-paths
我想在我的 Xamarin.Android 项目中使用 Triton Digital Mobile SDK。
创建绑定库并尝试构建它后，出现此错误：
error CS0534: 'HttpGetRequest' does not implement inherited abstract member 'AsyncTask.DoInBackground(params Object[]?)'
我使用 decompiler :
检查了HttpGetRequest 的内容
package com.tritondigital.util;
import android.os.AsyncTask;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpGetRequest extends AsyncTask<String, Void, String> {
public static final String REQUEST_METHOD = "GET";
public static final int READ_TIMEOUT = 15000;
public static final int CONNECTION_TIMEOUT = 15000;
protected String doInBackground(String... params) {
String result, stringUrl = params[0];
try {
URL myUrl = new URL(stringUrl);
HttpURLConnection connection = (HttpURLConnection)myUrl.openConnection();
connection.setRequestMethod("GET");
connection.setReadTimeout(15000);
connection.setConnectTimeout(15000);
connection.connect();
connection.getResponseCode();
InputStreamReader streamReader = new InputStreamReader(connection.getInputStream());
BufferedReader reader = new BufferedReader(streamReader);
StringBuilder stringBuilder = new StringBuilder();
String inputLine;
while ((inputLine = reader.readLine()) != null)
stringBuilder.append(inputLine);
reader.close();
streamReader.close();
result = stringBuilder.toString();
} catch (IOException e) {
result = null;
}
return result;
}
protected void onPostExecute(String result) {
super.onPostExecute(result);
}
}
这是 Xamarin 绑定库出错的文件内容：
using System;
using System.Collections.Generic;
using Android.Runtime;
using Java.Interop;
namespace Com.Tritondigital.Util {
// Metadata.xml XPath class reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']"
[global::Android.Runtime.Register ("com/tritondigital/util/HttpGetRequest", DoNotGenerateAcw=true)]
public partial class HttpGetRequest : global::Android.OS.AsyncTask {
// Metadata.xml XPath field reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/field[@name='CONNECTION_TIMEOUT']"
[Register ("CONNECTION_TIMEOUT")]
public const int ConnectionTimeout = (int) 15000;
// Metadata.xml XPath field reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/field[@name='READ_TIMEOUT']"
[Register ("READ_TIMEOUT")]
public const int ReadTimeout = (int) 15000;
// Metadata.xml XPath field reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/field[@name='REQUEST_METHOD']"
[Register ("REQUEST_METHOD")]
public const string RequestMethod = (string) "GET";
static readonly JniPeerMembers _members = new XAPeerMembers ("com/tritondigital/util/HttpGetRequest", typeof (HttpGetRequest));
internal static IntPtr class_ref {
get { return _members.JniPeerType.PeerReference.Handle; }
}
[global::System.Diagnostics.DebuggerBrowsable (global::System.Diagnostics.DebuggerBrowsableState.Never)]
[global::System.ComponentModel.EditorBrowsable (global::System.ComponentModel.EditorBrowsableState.Never)]
public override global::Java.Interop.JniPeerMembers JniPeerMembers {
get { return _members; }
}
[global::System.Diagnostics.DebuggerBrowsable (global::System.Diagnostics.DebuggerBrowsableState.Never)]
[global::System.ComponentModel.EditorBrowsable (global::System.ComponentModel.EditorBrowsableState.Never)]
protected override IntPtr ThresholdClass {
get { return _members.JniPeerType.PeerReference.Handle; }
}
[global::System.Diagnostics.DebuggerBrowsable (global::System.Diagnostics.DebuggerBrowsableState.Never)]
[global::System.ComponentModel.EditorBrowsable (global::System.ComponentModel.EditorBrowsableState.Never)]
protected override global::System.Type ThresholdType {
get { return _members.ManagedPeerType; }
}
protected HttpGetRequest (IntPtr javaReference, JniHandleOwnership transfer) : base (javaReference, transfer)
{
}
// Metadata.xml XPath constructor reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/constructor[@name='HttpGetRequest' and count(parameter)=0]"
[Register (".ctor", "()V", "")]
public unsafe HttpGetRequest () : base (IntPtr.Zero, JniHandleOwnership.DoNotTransfer)
{
const string __id = "()V";
if (((global::Java.Lang.Object) this).Handle != IntPtr.Zero)
return;
try {
var __r = _members.InstanceMethods.StartCreateInstance (__id, ((object) this).GetType (), null);
SetHandle (__r.Handle, JniHandleOwnership.TransferLocalRef);
_members.InstanceMethods.FinishCreateInstance (__id, this, null);
} finally {
}
}
static Delegate cb_doInBackground_arrayLjava_lang_String_;
#pragma warning disable 0169
static Delegate GetDoInBackground_arrayLjava_lang_String_Handler ()
{
if (cb_doInBackground_arrayLjava_lang_String_ == null)
cb_doInBackground_arrayLjava_lang_String_ = JNINativeWrapper.CreateDelegate ((_JniMarshal_PPL_L) n_DoInBackground_arrayLjava_lang_String_);
return cb_doInBackground_arrayLjava_lang_String_;
}
static IntPtr n_DoInBackground_arrayLjava_lang_String_ (IntPtr jnienv, IntPtr native__this, IntPtr native__params)
{
var __this = global::Java.Lang.Object.GetObject<global::Com.Tritondigital.Util.HttpGetRequest> (jnienv, native__this, JniHandleOwnership.DoNotTransfer);
var @params = (string[]) JNIEnv.GetArray (native__params, JniHandleOwnership.DoNotTransfer, typeof (string));
IntPtr __ret = JNIEnv.NewString (__this.DoInBackground (@params));
if (@params != null)
JNIEnv.CopyArray (@params, native__params);
return __ret;
}
#pragma warning restore 0169
// Metadata.xml XPath method reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/method[@name='doInBackground' and count(parameter)=1 and parameter[1][@type='java.lang.String...']]"
[Register ("doInBackground", "([Ljava/lang/String;)Ljava/lang/String;", "GetDoInBackground_arrayLjava_lang_String_Handler")]
protected virtual unsafe string DoInBackground (params string[] @params)
{
const string __id = "doInBackground.([Ljava/lang/String;)Ljava/lang/String;";
IntPtr native__params = JNIEnv.NewArray (@params);
try {
JniArgumentValue* __args = stackalloc JniArgumentValue [1];
__args [0] = new JniArgumentValue (native__params);
var __rm = _members.InstanceMethods.InvokeVirtualObjectMethod (__id, this, __args);
return JNIEnv.GetString (__rm.Handle, JniHandleOwnership.TransferLocalRef);
} finally {
if (@params != null) {
JNIEnv.CopyArray (native__params, @params);
JNIEnv.DeleteLocalRef (native__params);
}
global::System.GC.KeepAlive (@params);
}
}
static Delegate cb_onPostExecute_Ljava_lang_String_;
#pragma warning disable 0169
static Delegate GetOnPostExecute_Ljava_lang_String_Handler ()
{
if (cb_onPostExecute_Ljava_lang_String_ == null)
cb_onPostExecute_Ljava_lang_String_ = JNINativeWrapper.CreateDelegate ((_JniMarshal_PPL_V) n_OnPostExecute_Ljava_lang_String_);
return cb_onPostExecute_Ljava_lang_String_;
}
static void n_OnPostExecute_Ljava_lang_String_ (IntPtr jnienv, IntPtr native__this, IntPtr native_result)
{
var __this = global::Java.Lang.Object.GetObject<global::Com.Tritondigital.Util.HttpGetRequest> (jnienv, native__this, JniHandleOwnership.DoNotTransfer);
var result = JNIEnv.GetString (native_result, JniHandleOwnership.DoNotTransfer);
__this.OnPostExecute (result);
}
#pragma warning restore 0169
// Metadata.xml XPath method reference: path="/api/package[@name='com.tritondigital.util']/class[@name='HttpGetRequest']/method[@name='onPostExecute' and count(parameter)=1 and parameter[1][@type='java.lang.String']]"
[Register ("onPostExecute", "(Ljava/lang/String;)V", "GetOnPostExecute_Ljava_lang_String_Handler")]
protected virtual unsafe void OnPostExecute (string result)
{
const string __id = "onPostExecute.(Ljava/lang/String;)V";
IntPtr native_result = JNIEnv.NewString (result);
try {
JniArgumentValue* __args = stackalloc JniArgumentValue [1];
__args [0] = new JniArgumentValue (native_result);
_members.InstanceMethods.InvokeVirtualVoidMethod (__id, this, __args);
} finally {
JNIEnv.DeleteLocalRef (native_result);
}
}
}
}
关于如何解决这个问题有什么想法吗？
您可以打开Transforms文件夹下的Metadata.xml，添加如下代码：
<add-node path="/api/package[@name='com.tritondigital.util']">
<class abstract="false" deprecated="not deprecated" final="false" name="HttpGetRequest" static="true" visibility="public" extends="java.lang.Object"/>
</add-node>
此外，您可以查看类似案例并阅读有关绑定的文档。
案例：error CS0534: [java class] does not implement inherited abstract member 'AsyncTask.DoInBackground(params Object[])'
文档：https://gist.github.com/JonDouglas/dda6d8ace7d071b0e8cb#common-paths