帮我编写一个解码aac数据的安卓代码

好的，下面是一个基本的解码AAC数据的Android代码示例：

import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.media.MediaCodec;
import android.media.MediaExtractor;
import android.media.MediaFormat;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;

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

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private Button mButton;
    private MediaExtractor mExtractor;
    private MediaCodec mDecoder;
    private ByteBuffer[] mInputBuffers;
    private ByteBuffer[] mOutputBuffers;
    private int mInputBufferIndex;
    private int mOutputBufferIndex;
    private MediaCodec.BufferInfo mBufferInfo;
    private AudioTrack mAudioTrack;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mButton = findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startDecode();
            }
        });
    }

    private void startDecode() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    File file = new File(Environment.getExternalStorageDirectory(), "test.aac");
                    FileInputStream fis = new FileInputStream(file);

                    mExtractor = new MediaExtractor();
                    mExtractor.setDataSource(fis.getFD());

                    int audioTrackIndex = -1;
                    int trackCount = mExtractor.getTrackCount();
                    for (int i = 0; i < trackCount; i++) {
                        MediaFormat format = mExtractor.getTrackFormat(i);
                        String mime = format.getString(MediaFormat.KEY_MIME);
                        Log.d(TAG, "mime type: " + mime);

                        if (mime.startsWith("audio/")) {
                            mExtractor.selectTrack(i);
                            mDecoder = MediaCodec.createDecoderByType(mime);
                            mDecoder.configure(format, null, null, 0);
                            mDecoder.start();

                            mInputBuffers = mDecoder.getInputBuffers();
                            mOutputBuffers = mDecoder.getOutputBuffers();
                            mBufferInfo = new MediaCodec.BufferInfo();

                            int sampleRate = format.getInteger(MediaFormat.KEY_SAMPLE_RATE);
                            int channelCount = format.getInteger(MediaFormat.KEY_CHANNEL_COUNT);
                            int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
                            int minBufferSize = AudioTrack.getMinBufferSize(sampleRate, channelCount, audioFormat);
                            mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, channelCount, audioFormat, minBufferSize, AudioTrack.MODE_STREAM);
                            mAudioTrack.play();

                            audioTrackIndex = i;
                            break;
                        }
                    }

                    if (audioTrackIndex == -1) {
                        Log.e(TAG, "no audio track found");
                        return;
                    }

                    while (true) {
                        mInputBufferIndex = mDecoder.dequeueInputBuffer(10000);
                        if (mInputBufferIndex < 0) {
                            continue;
                        }

                        ByteBuffer inputBuffer = mInputBuffers[mInputBufferIndex];
                        inputBuffer.clear();

                        int sampleSize = mExtractor.readSampleData(inputBuffer, 0);
                        if (sampleSize < 0) {
                            mDecoder.queueInputBuffer(mInputBufferIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
                            break;
                        }

                        mDecoder.queueInputBuffer(mInputBufferIndex, 0, sampleSize, mExtractor.getSampleTime(), 0);
                        mExtractor.advance();

                        mOutputBufferIndex = mDecoder.dequeueOutputBuffer(mBufferInfo, 10000);
                        while (mOutputBufferIndex >= 0) {
                            ByteBuffer outputBuffer = mOutputBuffers[mOutputBufferIndex];
                            byte[] chunk = new byte[mBufferInfo.size];
                            outputBuffer.get(chunk);
                            outputBuffer.clear();

                            mAudioTrack.write(chunk, 0, chunk.length);

                            mDecoder.releaseOutputBuffer(mOutputBufferIndex, false);
                            mOutputBufferIndex = mDecoder.dequeueOutputBuffer(mBufferInfo, 0);
                        }

                        if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
                            Log.d(TAG, "end of stream reached");
                            break;
                        }
                    }

                    mAudioTrack.stop();
                    mAudioTrack.release();
                    mDecoder.stop();
                    mDecoder.release();
                    mExtractor.release();
                    fis.close();

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

这个代码示例使用了Android提供的MediaExtractor和MediaCodec来解码AAC文件，然后使用AudioTrack播放解码后的音频数据。请注意，在实际使用中你可能需要根据自己的需求进行修改和优化。