录音机错误

Question

我正在尝试使一个录音器，我正在点击录制按钮，它给出错误作为致命异常:主进程: rishabh.agarwal.holmes.recorder，PID:在rishabh.agarwal.holmes.recorder.MainActivity$2.onClick(MainActivity.java:47)的android.media.MediaRecorder.setOutputFormat(Native方式下为22175 java.lang.IllegalStateException )

这是我的代码

public class MainActivity extends AppCompatActivity {

Button btnPlay,btnRec,btnStop;
MediaRecorder mr;
String fname;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    fname=Environment.getExternalStorageDirectory()+"/myrec1.3gp";
    btnPlay=(Button)findViewById(R.id.button1);
    btnRec=(Button)findViewById(R.id.button2);
    btnStop=(Button)findViewById(R.id.button3);
    btnPlay.setEnabled(false);
    btnStop.setEnabled(false);
    btnPlay.setOnClickListener(new OnClickListener() {


        @Override
        public void onClick(View v) {


        }
    });

    btnRec.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mr = new MediaRecorder();
            mr.setOutputFile(fname);
            mr.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
            mr.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
            mr.setAudioSource(MediaRecorder.AudioSource.MIC);
            try {
                mr.prepare();
            } catch (IllegalStateException e) {

                e.printStackTrace();
               // Toast.makeText(MainActivity.this, e.toString(), 5).show();
            } catch (IOException e) {
                // TODO Auto-generated catch block
               // Toast.makeText(MainActivity.this, e.toString(), 5).show();
                e.printStackTrace();
            }
            mr.start();
            btnRec.setEnabled(false);
            btnStop.setEnabled(true);
        }
    });

    btnStop.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mr.release();
            mr.stop();

        }
    });
}

}

Answer 1

尝试删除此行

mr.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

Answer 2

试试这个：-

recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)；recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC)；

Answer 3

您忘记在清单文件中放置权限。在清单文件中编写以下代码。

 <uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>