java - Android Studio - Java 方法调用 getBytesFromFile() 失败

Question

我正在使用 Android Studio 和 Oracle Java 8。我试图从文件中获取所有字节并将它们传递给字节数组。下面的代码就像没有看到 import java.io.File;

我收到错误消息:

 cannot resolve method getBytesFromFile(java.io.File)

代码

import java.io.File;

    // ...

    File path = new File(
        Environment.getExternalStorageDirectory().getAbsolutePath() 
            + "/zTest-Records/");

    path.mkdirs();
    try {
        recordingFile = File.createTempFile("recording", ".pcm", path); 
    } catch (IOException e) {
        throw new RuntimeException("Couldn't create pcm file", e);
    }

    // NOTE: The code below gives error message: cannot resolve method 'getBytesFromFile(java.io.File)'
    byte[] data = getBytesFromFile(recordingFile); 

Answer 1

该函数未定义，也许您从某处复制粘贴此代码。

快速谷歌搜索指向此链接:

https://code.google.com/p/picturesque/source/browse/myClasses/GetBytesFromFile.java?r=1d9332c4c969b4d35847c10f7c83b04c1ccb834f

package myClasses;
import java.util.*;
import java.io.*;

public class GetBytesFromFile {

        public static byte[] getBytesFromFile(File file) throws IOException {
                InputStream is = new FileInputStream(file);

                // Get the size of the file
                long length = file.length();

                // You cannot create an array using a long type.
                // It needs to be an int type.
                // Before converting to an int type, check
                // to ensure that file is not larger than Integer.MAX_VALUE.
                if (length > Integer.MAX_VALUE) {
                        // File is too large
                }

                // Create the byte array to hold the data
                byte[] bytes = new byte[(int)length];

                // Read in the bytes
                int offset = 0;
                int numRead = 0;
                while (offset < bytes.length
                           && (numRead = is.read(bytes, offset, Math.min(bytes.length - offset, 512*1024))) >= 0) {
                        offset += numRead;
                }

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

                // Close the input stream and return bytes
                is.close();
                return bytes;
        }
}

您可能需要将此类添加到您的项目中