Android中的NegativeArraySizeException

Question

我試圖運行此代碼，但出現錯誤。誰能告訴我爲什麼？調試器顯示以下

螺紋[< 3>主]（暫停（例外NegativeArraySizeException）） ViewRoot.handleMessage（消息）線：1704 的ViewRoot（處理程序）.dispatchMessage（消息）線：99 Looper.loop （）行：123 ActivityThread.main（String []）line：4203 Method.invokeNative（Object，Object []，Class，Class []，Class，int，boolean）line：not available [本機方法] Method .invoke（Object，Object ...）line：521 ZygoteInit $ MethodAndArgsCaller.run（）line：791 ZygoteInit.main（String []）line：549 NativeStart.main（String []）line：not available [本地方法]

public void convertAudio() throws IOException { 
    Log.d("FILE", "Converting Audio"); 
    java.io.File fileExist = new java.io.File("/sdcard/" , "test1.3gp"); 
    java.io.File fileNew = new java.io.File("/sdcard/" , "test2.3gp"); 
    if (fileNew.exists()) { 
    FileInputStream fExist = new FileInputStream(fileExist); 
     FileInputStream fNew = new FileInputStream(fileNew); 

     long lengthExist = fileExist.length(); 
     if (lengthExist > Integer.MAX_VALUE) { 
      // File is too large 
     } 
     byte[] bytesExist = new byte[(int)lengthExist]; 

     int offset = 0; 
     int numRead = 0; 
     try { 
     while (offset < bytesExist.length && (numRead=fExist.read(bytesExist, offset, bytesExist.length-offset)) >= 0) { 
      offset += numRead; 
     } 
     } finally { 


     } 

     // Ensure all the bytes have been read in 
     if (offset < bytesExist.length) { 
      throw new IOException("Could not completely read file "+fileExist.getName()); 
     } 


     byte[] cleanExist = convert3gpDataToAmr(bytesExist); 

     long lengthNew = fileNew.length(); 
     if (lengthNew > Integer.MAX_VALUE) { 
      // File is too large 
     } 
     byte[] bytesNew = new byte[(int)lengthNew]; 

     int offsetNew = 0; 
     int numReadNew = 0; 
     try { 
     while (offset < bytesNew.length && (numRead=fNew.read(bytesNew, offsetNew, bytesNew.length-offsetNew)) >= 0) { 
     offsetNew += numReadNew; 
     } 
     } finally { 


     } 

     // Ensure all the bytes have been read in 
     if (offset < bytesNew.length) { 
      throw new IOException("Could not completely read file "+fileExist.getName()); 
     } 


     byte[] cleanNew = convert3gpDataToAmr(bytesNew);  

    } 


    } 

//＃！AMR \ n

private static byte[] AMR_MAGIC_HEADER = {0x23, 0x21, 0x41, 0x4d, 0x52, 0x0a}; 

    public byte[] convert3gpDataToAmr(byte[] data) { 
    if (data == null) { 
     return null; 
    } 

    ByteArrayInputStream bis = new ByteArrayInputStream(data); 
     // read FileTypeHeader 
    FileTypeBox ftypHeader = new FileTypeBox(bis); 
    // You can check if it is correct here 
    // read MediaDataHeader 
    MediaDataBox mdatHeader = new MediaDataBox(bis); 
    // You can check if it is correct here 
    int rawAmrDataLength = mdatHeader.getDataLength(); 
    int fullAmrDataLength = AMR_MAGIC_HEADER.length + rawAmrDataLength; 
    byte[] amrData = new byte[fullAmrDataLength]; 
    System.arraycopy(AMR_MAGIC_HEADER, 0, amrData, 0, AMR_MAGIC_HEADER.length); 
     bis.read(amrData, AMR_MAGIC_HEADER.length, rawAmrDataLength); 
    return amrData; 
} 


} 

Answer 1

我會檢查是否fullAmrDataLength是否定的，因爲那時

byte[] amrData = new byte[fullAmrDataLength]; 

會導致NegativeArraySizeException。