Android java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法'int java.lang.Object.hashCode'

问题描述

07-11 02:26:51.393 E/AndroidRuntime(11963): Process: com.youku.iot,PID: 11963
07-11 02:26:51.393 E/AndroidRuntime(11963): Process: com.youku.iot,PID: 11963
07-11 02:26:51.393 E/AndroidRuntime(11963): java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
07-11 02:26:51.393 E/AndroidRuntime(11963): at android.os.Parcel.createException(Parcel.java:1956)
07-11 02:26:51.393 E/AndroidRuntime(11963): at android.os.Parcel.readException(Parcel.java:1918)
07-11 02:26:51.393 E/AndroidRuntime(11963): at android.os.Parcel.readException(Parcel.java:1868)
07-11 02:26:51.393 E/AndroidRuntime(11963): at com.xiaomi.mi_soundBox_command_sdk.IMiCommandInterface$Stub$Proxy.setPlaying(IMiCommandInterface.java:150)

以下代码来自Android源代码，但找不到任何可调用的代码 Object.hashCode。

/**
 * Throw an exception with the given message. Not intended for use
 * outside the Parcel class.
 *
 * @param code Used to determine which exception class to throw.
 * @param msg The exception message.
 */
public final void readException(int code,String msg) {
    String remoteStackTrace = null;
    final int remoteStackPayloadSize = readInt();
    if (remoteStackPayloadSize > 0) {
        remoteStackTrace = readString();
    }
    Exception e = createException(code,msg);
    // Attach remote stack trace if availalble
    if (remoteStackTrace != null) {
        remoteexception cause = new remoteexception(
                "Remote stack trace:\n" + remoteStackTrace,null,false,false);
        try {
            Throwable rootCause = ExceptionUtils.getRootCause(e);
            if (rootCause != null) {
                rootCause.initCause(cause);
            }
        } catch (RuntimeException ex) {
            Log.e(TAG,"Cannot set cause " + cause + " for " + e,ex);
        }
    }
    SneakyThrow.sneakyThrow(e);
}

/**
 * Creates an exception with the given message.
 *
 * @param code Used to determine which exception class to throw.
 * @param msg The exception message.
 */
private Exception createException(int code,String msg) {
    switch (code) {
        case EX_PARCELABLE:
            if (readInt() > 0) {
                return (Exception) readParcelable(Parcelable.class.getClassLoader());
            } else {
                return new RuntimeException(msg + " [missing Parcelable]");
            }
        case EX_Security:
            return new SecurityException(msg);
        case EX_BAD_PARCELABLE:
            return new BadParcelableException(msg);
        case EX_ILLEgal_ARGUMENT:
            return new IllegalArgumentException(msg);
        case EX_NULL_POINTER:
            return new NullPointerException(msg);
        case EX_ILLEgal_STATE:
            return new IllegalStateException(msg);
        case EX_NETWORK_MAIN_THREAD:
            return new networkonmainthreadException();
        case EX_UNSUPPORTED_OPERATION:
            return new UnsupportedOperationException(msg);
        case EX_SERVICE_SPECIFIC:
            return new ServiceSpecificException(readInt(),msg);
    }
    return new RuntimeException("UnkNown exception code: " + code
            + " msg " + msg);
}

/**
 * Read an integer value from the parcel at the current dataPosition().
 */
public final int readInt() {
    return nativeReadInt(mNativePtr);
}

/**
 * Read a long integer value from the parcel at the current dataPosition().
 */
public final long readLong() {
    return nativeReadLong(mNativePtr);
}

问题：在上面的代码中找不到任何调用Object.hashCode的代码。

解决方法

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