无法从源类型转换为目标类型(JNIEnv.GetArray <java.lang.object>(pudis.Handle);)</java.lang.object>

时间:2014-12-18 10:15:49

标签: java c# android xamarin.android xamarin-studio

我正在尝试在我的应用中接收短信。

我的项目中有一个BroadcastReceiver类,我收到一个运行时错误:

  

System.InvalidCastException:无法从源类型转换为   目的地类型。 at at(wrapper castclass)   对象.__ castclass_with_cache(object,intptr,intptr)at at Android.Runtime.JNIEnv.CopyArray   (intptr,Java.Lang.Object [])&lt; 0x002a3&gt; at at   Android.Runtime.JNIEnv.GetArray(intptr)&lt; 0x0021f&gt;

  在Messages.SMSBroadcastReceiver.OnReceive   (Android.Content.Context,Android.Content.Intent)[0x0005f] in   C:\用户\ Jase \文件\项目\消息\消息\ SMSBroadcastReceiver.cs:36   在   Android.Content.BroadcastReceiver.n_OnReceive_Landroid_content_Context_Landroid_content_Intent_   (intptr,intptr,intptr,intptr)[0x00019] in   /Users/builder/data/lanes/monodroid-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)   object.145a0c82-0de6-4c2c-90a0-3654436a06c3   (intptr,intptr,intptr,intptr)

以下是我使用的代码:

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();
        }
    }
}

我一直试图提出一段时间的解决方案并且已经搜索了几个小时但是这个错误的现有解决方案都没有奏效。我不明白。有人可以帮忙解释一下吗?


我用以下内容更新此问题:

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

我还要注意,我已经尝试了很多方法来解决这个问题。我现在(真的)在Google搜索结果的第60页上,尝试找到某些内容。问题是,我在网上找到的这个完全相同的错误的解决方案实际上都没有效果,因为它们基本上只是同一个语句的微小变化,只是以稍微不同的方式编写,但做同样的事情产生相同的例外。

我也尝试了以下内容:

//                    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,例外情况不同于&#34;无法从源类型转换为目标类型&#34;,到&#34;无法将对象[]转换为对象&#34;。好吧,呃。但问题不在于我做错了,而是我们告诉这样做&#34;错误&#34;&#34; 34 ;.在Xamarin中没有其他方式可以在线找到我的短信。在线的每个示例似乎都基于这一个代码片段 - 给予或进行一些小的改动。我不知道现在该做什么。似乎没有一丝希望。

3 个答案:

答案 0 :(得分:1)

既然您说过要在Android Studio中使用Java,但没有给出答案,我会留下一个给您和其他可能正在寻找解决方案的人。

SmsReceiver.java:

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();
            }
        }
    }
}

请务必将所需的权限和intent-filter添加到AndroidManifest.xml文件中。

的AndroidManifest.xml:

<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>

答案 1 :(得分:1)

到目前为止,您可能已经在Java中实现了自己的应用,但这是我在Android 5.0上读取pdu的解决方案。

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);

顺便说一下,它似乎是一个与Xamarin相关的bug。检查Bugzilla Issue 26674

答案 2 :(得分:0)

这是另一种选择:

[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));
        }

    }
}