如何在android中用java编程实现麦克风静音

MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);

recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
recorder.setOutputFile(filePath);

recorder.prepare();
recorder.start();

recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

recorder.stop();
recorder.release();

import android.media.MediaRecorder;

public class MainActivity extends AppCompatActivity {
    private MediaRecorder recorder;
    private String filePath;

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

        // 获取录音权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, 1);
        }

        // 设置文件保存路径
        filePath = getExternalCacheDir().getAbsolutePath() + "/recording.3gp";

        // 创建MediaRecorder对象
        recorder = new MediaRecorder();
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
        recorder.setOutputFile(filePath);

        try {
            // 准备录音和开始录音
            recorder.prepare();
            recorder.start();

            // 静音麦克风
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

            // 停止录音和释放资源
            recorder.stop();
            recorder.release();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}