/**
 * 获取mp3文件的采样率
 * @param filefullname 文件完整路径
 * @return 采样率
 */
public int getMp3SampleRate(String filefullname) {
    MediaExtractor mExtractor = new MediaExtractor();
    try {
        mExtractor.setDataSource(filefullname);
    } catch (IOException e) {
        e.printStackTrace();
    }
    MediaFormat format = mExtractor.getTrackFormat(0);
    //获取当前音频的采样率
    mExtractor.selectTrack(0);
    int mSampleRate = format.getInteger(MediaFormat.KEY_SAMPLE_RATE);
    return mSampleRate;
}