无法从源类型转换为目标类型 (JNIEnv.GetArray(pudis.手柄);)

我正在尝试在我的应用程序中接收短信。

我的项目中有一个 BroadcastReceiver 类，但收到运行时错误：

System.InvalidCastException：无法从源类型转换为 目标类型。 at at (包装器演员表 object.__castclass_with_cache (object，intptr，intptr( at at Android.Runtime.JNIEnv.CopyArray (intptr，Java.Lang.Object[]( <0x002a3> at at Android.Runtime.JNIEnv.GetArray (intptr( <0x0021f>
at Messages.SMSBroadcastReceiver.OnReceive (Android.Content.Context，Android.Content.Intent([0x0005f] 在 c：''Users''Jase''Documents''Projects''Messages''Messages''SMSBroadcastReceiver.cs：36 在 Android.Content.BroadcastReceiver.n_OnReceive_Landroid_content_Context_Landroid_content_Intent_ (intptr，intptr，intptr，intptr([0x00019] 在 /用户/建造者/数据/车道/单机器人-mlion-monodroid-4.20-series/ba9bbbdd/source/monodroid/src/Mono.Android/platforms/android-21/src/generated/Android.Content.BroadcastReceiver.cs：334 at at (包装器动态方法( 对象.145a0c82-0de6-4c2c-90a0-3654436a06c3 (intptr，intptr，intptr，intptr(

这是我正在使用的代码：

using System;
using System.Text;
using Android.App;
using Android.OS;
using Android.Content;
using Android.Runtime;
using Android.Util;
using Android.Widget;
using Android.Telephony;
using Environment = System.Environment;
namespace Messages
{
    [BroadcastReceiver(Enabled = true, Label = "SMS Receiver")]
    [IntentFilter(new[] { "android.provider.Telephony.SMS_RECEIVED" })]
    public class SMSBroadcastReceiver : BroadcastReceiver
    {
        private const string Tag = "SMSBroadcastReceiver";
        private const string IntentAction = "android.provider.Telephony.SMS_RECEIVED";
        public override void OnReceive(Context context, Intent intent)
        {
            Log.Info(Tag, "Intent: " + intent.Action);
            if (intent.Action != IntentAction)
                return;
            var bundle = intent.Extras;
            if (bundle == null)
                return;
            var pdus = bundle.Get("pdus");

            // ********** This is the error line at runtime ****************
            var castedPdus = JNIEnv.GetArray<Java.Lang.Object>(pdus.Handle);
            var messages = new SmsMessage[castedPdus.Length];
            var stringBuilder = new StringBuilder();
            for (int i = 0; i < messages.Length; i++)
            {
                var bytes = new byte[JNIEnv.GetArrayLength(castedPdus[i].Handle)];
                JNIEnv.CopyArray(castedPdus[i].Handle, bytes);
                messages[i] = SmsMessage.CreateFromPdu(bytes);
                stringBuilder.Append(String.Format("SMS from: {0}{1}Body: {2}{1}", messages[i].OriginatingAddress,
                        Environment.NewLine, messages[i].MessageBody));
            }
            Toast.MakeText(context, stringBuilder.ToString(), ToastLength.Long).Show();
        }
    }
}

一段时间以来，我一直在尝试提出解决方案，并且已经搜索了几个小时，但是针对此错误的现有解决方案都没有奏效。我不明白。有人可以帮忙阐明这一点吗？

我正在更新这个问题：

Bundle not null: Bundle[mParcelledData.dataSize=256]
PDUS: [[B@5s294833
PDUS Handle: 2065454
Cannot cast from source type to destination type.   at (wrapper castclass) object:__castclass_with_cache (object,intptr,intptr)
  at Android.Runtime.JNIEnv.CopyArray[Object] (IntPtr src, Java.Lang.Object[] dest) [0x00078] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.20-series/ba9bbbdd/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.cs:946 
  at Android.Runtime.JNIEnv.GetArray[Object] (IntPtr array_ptr) [0x00053] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.20-series/ba9bbbdd/source/monodroid/src/Mono.Android/src/Runtime/JNIEnv.cs:1211 
  at Java.Lang.Object.ToArray[Object] () [0x00000] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.20-series/ba9bbbdd/source/monodroid/src/Mono.Android/src/Java.Lang/Object.cs:338 
  at Java.Lang.Object.op_Explicit (Java.Lang.Object value) [0x00008] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.20-series/ba9bbbdd/source/monodroid/src/Mono.Android/src/Java.Lang/Object.cs:499 
  at Messages.SMSBroadcastReceiver.OnReceive (Android.Content.Context context, Android.Content.Intent intent) [0x000ba] in c:'Users'Jase'Documents'Projects'Messages'Messages'SMSBroadcastReceiver.cs:52

我还想指出，我已经尝试了很多方法来解决这个问题。我现在(真的(在谷歌搜索结果的第60页上，试图找到一些东西。问题是，我在网上找到的针对这个完全相同错误的解决方案都没有实际工作，因为它们基本上只是同一语句的微小变体，只是以略有不同的方式编写，但做同样的事情会产生相同的异常。

我还尝试了以下方法：

//                    var castedPdus = JNIEnv.GetObjectArrayElement(pdus.Handle, 0);
//                    Object castedPdus = (Object)bundle.Get("pdus");
//                    var castedPdus = JNIEnv.GetArray<Java.Lang.Object>(pdus.Handle);

没有任何运气。

根据我使用的语句，异常从"无法从源类型转换为目标类型"到"无法将对象 [] 转换为对象"不等。嗯，嘟嘟。但问题不在于我"做错了"，而是我们被告知要做"错"。我无法在网上找到其他方式可以在 Xamarin 中接收短信。网上的每一个例子似乎都基于这个代码片段 - 给予或采取一些小的更改。我不知道现在该怎么办。似乎甚至没有一丝希望。

package com.your.app;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.Toast;
public class SmsReceiver extends BroadcastReceiver {
    private static final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(SMS_RECEIVED)) {
            Bundle bundle = intent.getExtras();
            if (bundle != null) {
                // get sms objects
                Object[] pdus = (Object[]) bundle.get("pdus");
                if (pdus.length == 0) {
                    return;
                }
                // large message might be broken into many
                SmsMessage[] messages = new SmsMessage[pdus.length];
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < pdus.length; i++) {
                    messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
                    sb.append(messages[i].getMessageBody());
                }
                String sender = messages[0].getOriginatingAddress();
                Log.d("SNDR", sender);
                String message = sb.toString();
                Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
                // prevent any other broadcast receivers from receiving broadcast
                abortBroadcast();
            }
        }
    }
}

<uses-permission android:name="android.permission.RECEIVE_SMS" />
<application
    android:allowBackup="true"
    android:icon="@drawable/icon"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <receiver android:name="com.your.app.SmsReceiver" android:enabled="true">
        <intent-filter android:priority="2147483647">
            <action android:name="android.provider.Telephony.SMS_RECEIVED" />
        </intent-filter>
    </receiver>
</application>

Java.Lang.Object rawPdus = intent.Extras.Get("pdus");
int length = JNIEnv.GetArrayLength(rawPdus.Handle);
if (length < 1)
    return;
var pdus = JNIEnv.GetArrayItem<byte[]>(rawPdus.Handle, 0);
var msg = SmsMessage.CreateFromPdu(pdus);

[BroadcastReceiver(Enabled = true, Label = "SMS Receiver")]
[IntentFilter(new[] { "android.provider.Telephony.SMS_RECEIVED" })] 
public class SMSBroadcastReceiver : BroadcastReceiver, ISMSReceiver
{
    private const string Tag = "SMSBroadcastReceiver";
    private const string IntentAction = "android.provider.Telephony.SMS_RECEIVED"; 
    public override void OnReceive(Context context, Intent intent)
    {
        Log.Info(Tag, "Intent received: " + intent.Action);
        if (intent.Action != IntentAction) return;
        SmsMessage[] messages=Telephony.Sms.Intents.GetMessagesFromIntent (intent);
        var sb = new StringBuilder();
        for (var i = 0; i < messages.Length; i++)
        {
            sb.Append(string.Format("SMS From: {0}{1}Body: {2}{1}", messages[i].OriginatingAddress,
                Environment.NewLine,messages[i].MessageBody));
        }
    }
}