要导出均衡音频文件，可以使用Android的MediaCodec和MediaMuxer类来实现。下面是一个简单的示例代码：

import android.media.MediaCodec;
import android.media.MediaCodecInfo;
import android.media.MediaFormat;
import android.media.MediaMuxer;
import android.os.Environment;
import android.util.Log;

import java.io.IOException;
import java.nio.ByteBuffer;

public class AudioExporter {
    private static final String TAG = "AudioExporter";
    private static final int TIMEOUT_US = 10000;

    private MediaCodec mediaCodec;
    private MediaMuxer mediaMuxer;
    private int audioTrackIndex;

    public void exportAudio(String inputFilePath, String outputFilePath) {
        try {
            MediaExtractor mediaExtractor = new MediaExtractor();
            mediaExtractor.setDataSource(inputFilePath);

            int audioTrackIndex = -1;
            for (int i = 0; i < mediaExtractor.getTrackCount(); i++) {
                MediaFormat format = mediaExtractor.getTrackFormat(i);
                String mime = format.getString(MediaFormat.KEY_MIME);
                if (mime.startsWith("audio/")) {
                    audioTrackIndex = i;
                    break;
                }
            }

            if (audioTrackIndex == -1) {
                Log.e(TAG, "No audio track found in the input file");
                return;
            }

            mediaExtractor.selectTrack(audioTrackIndex);
            MediaFormat audioFormat = mediaExtractor.getTrackFormat(audioTrackIndex);

            mediaMuxer = new MediaMuxer(outputFilePath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);

            mediaCodec = MediaCodec.createEncoderByType(audioFormat.getString(MediaFormat.KEY_MIME));
            mediaCodec.configure(audioFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
            mediaCodec.start();

            ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
            ByteBuffer[] outputBuffers = mediaCodec.getOutputBuffers();

            MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
            boolean isEOS = false;

            while (!isEOS) {
                int inputIndex = mediaCodec.dequeueInputBuffer(TIMEOUT_US);
                if (inputIndex >= 0) {
                    ByteBuffer inputBuffer = inputBuffers[inputIndex];
                    int sampleSize = mediaExtractor.readSampleData(inputBuffer, 0);
                    if (sampleSize < 0) {
                        mediaCodec.queueInputBuffer(inputIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
                        isEOS = true;
                    } else {
                        mediaCodec.queueInputBuffer(inputIndex, 0, sampleSize, mediaExtractor.getSampleTime(), 0);
                        mediaExtractor.advance();
                    }
                }

                int outputIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, TIMEOUT_US);
                if (outputIndex >= 0) {
                    ByteBuffer outputBuffer = outputBuffers[outputIndex];
                    mediaMuxer.writeSampleData(audioTrackIndex, outputBuffer, bufferInfo);
                    mediaCodec.releaseOutputBuffer(outputIndex, false);
                }
            }

            mediaMuxer.stop();
            mediaMuxer.release();
            mediaCodec.stop();
            mediaCodec.release();
            mediaExtractor.release();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用此代码，你可以将输入文件中的音频数据重新编码，并将结果写入输出文件。请确保在AndroidManifest.xml文件中添加相应的权限（例如读取和写入外部存储器的权限）。要使用该代码，请将输入文件的路径和输出文件的路径传递给exportAudio方法。