Android 录音后，录音机无法播放

我已经创建了音频播放器。录音机具有startRecording按钮和stopRecording按钮以及PlayRecording和Stop按钮。我注意到录制后，单击时录制的文件将不会播放，但Toast将显示，表示执行了某个操作。我无法在logcat中检测到任何错误。谢谢你的帮助

我的程序代码如下：

        //Requesting Run-time permission
        if (!checkPermissionFromDevice())
            requestPermission();

        //Init View
        btnPlay = (Button)findViewById(R.id.btnPlay);
        btnStop = (Button) findViewById(R.id.btnStop);
        btnStartRecorder = (Button) findViewById(R.id.startRecord);
        btnStopRecorder = (Button) findViewById(R.id.stopRecord);
        
        //implementing the actions
            btnStartRecorder.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if (checkPermissionFromDevice())
                    {


                    pathSave = Environment.getExternalStorageDirectory()
                            .getAbsolutePath()+"/"
                            + UUID.randomUUID().toString()+"_audio_record.amr";
                    setupMediaRecorder();
                    try {
                        mediaRecorder.prepare();
                        mediaRecorder.start();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    btnPlay.setEnabled(false);
                    btnStop.setEnabled(false);

                    Toast.makeText(RecorderActivity.this, "Recording...", Toast.LENGTH_SHORT).show();
                    }

                    else {
                        requestPermission();
                    }
                }
            });

            btnStopRecorder.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    mediaRecorder.stop();
                    btnStopRecorder.setEnabled(false);
                    btnPlay.setEnabled(true);
                    btnStartRecorder.setEnabled(true);
                    btnStop.setEnabled(false);
                    Toast.makeText(RecorderActivity.this, "Stop Record...", Toast.LENGTH_SHORT).show();
                }
            });

            btnPlay.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    btnStop.setEnabled(true);
                    btnStopRecorder.setEnabled(false);
                    btnStartRecorder.setEnabled(false);

                    mediaPlayer = new MediaPlayer();
                    try {
                        mediaPlayer.setDataSource(pathSave);
                        mediaPlayer.prepare();

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

                    mediaPlayer.start();
                    Toast.makeText(RecorderActivity.this, "Playing...", Toast.LENGTH_SHORT).show();

                }
            });

            btnStop.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    btnStopRecorder.setEnabled(false);
                    btnStartRecorder.setEnabled(true);
                    btnStop.setEnabled(false);
                    btnPlay.setEnabled(true);

                    if (mediaPlayer != null){
                        mediaPlayer.stop();
                        mediaPlayer.release();
                        setupMediaRecorder();
                        Toast.makeText(RecorderActivity.this, "Stop Playing...", Toast.LENGTH_SHORT).show();
                    }
                }
            });




    }

    private void setupMediaRecorder() {
        mediaRecorder = new MediaRecorder();
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mediaRecorder.setOutputFile(pathSave);
    }

    private void requestPermission() {
        ActivityCompat.requestPermissions(this, new String[]{
                Manifest.permission.WRITE_EXTERNAL_STORAGE,
        Manifest.permission.RECORD_AUDIO

        }, REQUEST_PERMISSION_CODE);
    }

    //Press Ctr+O


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case REQUEST_PERMISSION_CODE:
            {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                    Toast.makeText(this, "Permission Granted", Toast.LENGTH_SHORT).show();
                else {
                    Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
                }
            }
                break;
        }
    }

    private boolean checkPermissionFromDevice() {
        int write_external_storage_result = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        int record_audio_result = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
        return write_external_storage_result == PackageManager.PERMISSION_GRANTED &&
                record_audio_result == PackageManager.PERMISSION_GRANTED;
    }

}

---

这是您的问题的解决方案，您可以查看

public class RecordAudioActivity extends AppCompatActivity {
Button buttonStart, buttonStop, buttonPlayLastRecordAudio,
        buttonStopPlayingRecording, setAudioasMusic ;
File AudioSavePathInDevice;
MediaRecorder mediaRecorder ;
String audioUri;
public static final int RequestPermissionCode = 1;
MediaPlayer mediaPlayer ;
SharedPreferences sharedPref;
SharedPreferences.Editor editor;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    sharedPref = getSharedPreferences("musicUri", Context.MODE_PRIVATE);
    setContentView(R.layout.activity_record_audio);
    buttonStart = (Button) findViewById(R.id.button);
    buttonStop = (Button) findViewById(R.id.button2);
    buttonPlayLastRecordAudio = (Button) findViewById(R.id.button3);
    buttonStopPlayingRecording = (Button)findViewById(R.id.button4);
    setAudioasMusic = (Button)findViewById(R.id.button5);

    buttonStop.setEnabled(false);
    buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
    buttonPlayLastRecordAudio.setEnabled(false);
    buttonPlayLastRecordAudio.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
    buttonStopPlayingRecording.setEnabled(false);
    buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
    setAudioasMusic.setEnabled(false);
    setAudioasMusic.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));

    buttonStart.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.O)
        @Override
        public void onClick(View view) {

            if(checkPermission()) {


                 AudioSavePathInDevice =
                        new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                                + "/AudioRecording.3gp");
                if (Build.VERSION.SDK_INT < 24) {
                    audioUri = String.valueOf(Uri.fromFile(AudioSavePathInDevice));
                } else {
                    audioUri = String.valueOf(Uri.parse(AudioSavePathInDevice.getPath())); // My work-around for new SDKs, doesn't work in Android 10.
                }
                MediaRecorderReady();

                try {
                    mediaRecorder.prepare();
                    mediaRecorder.start();
                } catch (IllegalStateException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                buttonStart.setEnabled(false);
                buttonStart.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
                buttonStop.setEnabled(true);
                buttonStop.setTextColor(getResources().getColor(R.color.ef_white));

                Toast.makeText(RecordAudioActivity.this, "Recording started",
                        Toast.LENGTH_LONG).show();
            } else {
                requestPermission();
            }

        }
    });

    buttonStop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            mediaRecorder.stop();
            buttonStop.setEnabled(false);
            buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonPlayLastRecordAudio.setEnabled(true);
            buttonPlayLastRecordAudio.setTextColor(getResources().getColor(R.color.ef_white));
            buttonStart.setEnabled(true);
            buttonStart.setTextColor(getResources().getColor(R.color.ef_white));
            setAudioasMusic.setEnabled(true);
            setAudioasMusic.setTextColor(getResources().getColor(R.color.ef_white));
            buttonStopPlayingRecording.setEnabled(false);
            buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));

            Toast.makeText(RecordAudioActivity.this, "Recording Completed",
                    Toast.LENGTH_LONG).show();
        }
    });

    buttonPlayLastRecordAudio.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) throws IllegalArgumentException,
                SecurityException, IllegalStateException {

            buttonStop.setEnabled(false);
            buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonStart.setEnabled(false);
            buttonStart.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonStopPlayingRecording.setEnabled(true);
            buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_white));

            mediaPlayer = new MediaPlayer();
            try {
                mediaPlayer.setDataSource(String.valueOf(AudioSavePathInDevice));
                mediaPlayer.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }

            mediaPlayer.start();
            Toast.makeText(RecordAudioActivity.this, "Recording Playing",
                    Toast.LENGTH_LONG).show();
        }
    });

    buttonStopPlayingRecording.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.O)
        @Override
        public void onClick(View view) {
            buttonStop.setEnabled(false);
            buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonStart.setEnabled(true);
            buttonStart.setTextColor(getResources().getColor(R.color.ef_white));
            buttonStopPlayingRecording.setEnabled(false);
            buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonPlayLastRecordAudio.setEnabled(true);
            buttonPlayLastRecordAudio.setTextColor(getResources().getColor(R.color.ef_white));
            setAudioasMusic.setEnabled(true);
            setAudioasMusic.setTextColor(getResources().getColor(R.color.ef_white));

            if(mediaPlayer != null){
                mediaPlayer.stop();
                mediaPlayer.release();
                MediaRecorderReady();
            }
        }
    });

private void requestNewInterstitial() {
    mInterstitialAd.loadAd(new AdRequest.Builder().build());
}

@Override
public void onBackPressed() {
    super.onBackPressed();
    finish();
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case RequestPermissionCode:
            if (grantResults.length> 0) {
                boolean StoragePermission = grantResults[0] ==
                        PackageManager.PERMISSION_GRANTED;
                boolean RecordPermission = grantResults[1] ==
                        PackageManager.PERMISSION_GRANTED;

                if (StoragePermission && RecordPermission) {
                    Toast.makeText(RecordAudioActivity.this, "Permission Granted",
                            Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(RecordAudioActivity.this,"Permission " +
                            "Denied",Toast.LENGTH_LONG).show();
                }
            }
            break;
    }
}
public boolean checkPermission() {
    int result = ContextCompat.checkSelfPermission(getApplicationContext(),
            WRITE_EXTERNAL_STORAGE);
    int result1 = ContextCompat.checkSelfPermission(getApplicationContext(),
            RECORD_AUDIO);
    return result == PackageManager.PERMISSION_GRANTED &&
            result1 == PackageManager.PERMISSION_GRANTED;
}
private void requestPermission() {
    ActivityCompat.requestPermissions(RecordAudioActivity.this, new
            String[]{WRITE_EXTERNAL_STORAGE, RECORD_AUDIO}, RequestPermissionCode);
}
@RequiresApi(api = Build.VERSION_CODES.O)
public void MediaRecorderReady(){
    mediaRecorder=new MediaRecorder();
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
    mediaRecorder.setOutputFile(AudioSavePathInDevice);
}

---

这是你的问题的答案，你可以看看

public class RecordAudioActivity extends AppCompatActivity {
Button buttonStart, buttonStop, buttonPlayLastRecordAudio,
        buttonStopPlayingRecording, setAudioasMusic ;
File AudioSavePathInDevice;
MediaRecorder mediaRecorder ;
String audioUri;
public static final int RequestPermissionCode = 1;
MediaPlayer mediaPlayer ;
SharedPreferences sharedPref;
SharedPreferences.Editor editor;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    sharedPref = getSharedPreferences("musicUri", Context.MODE_PRIVATE);
    setContentView(R.layout.activity_record_audio);
    buttonStart = (Button) findViewById(R.id.button);
    buttonStop = (Button) findViewById(R.id.button2);
    buttonPlayLastRecordAudio = (Button) findViewById(R.id.button3);
    buttonStopPlayingRecording = (Button)findViewById(R.id.button4);
    setAudioasMusic = (Button)findViewById(R.id.button5);

    buttonStop.setEnabled(false);
    buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
    buttonPlayLastRecordAudio.setEnabled(false);
    buttonPlayLastRecordAudio.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
    buttonStopPlayingRecording.setEnabled(false);
    buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
    setAudioasMusic.setEnabled(false);
    setAudioasMusic.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));

    buttonStart.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.O)
        @Override
        public void onClick(View view) {

            if(checkPermission()) {


                 AudioSavePathInDevice =
                        new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                                + "/AudioRecording.3gp");
                if (Build.VERSION.SDK_INT < 24) {
                    audioUri = String.valueOf(Uri.fromFile(AudioSavePathInDevice));
                } else {
                    audioUri = String.valueOf(Uri.parse(AudioSavePathInDevice.getPath())); // My work-around for new SDKs, doesn't work in Android 10.
                }
                MediaRecorderReady();

                try {
                    mediaRecorder.prepare();
                    mediaRecorder.start();
                } catch (IllegalStateException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                buttonStart.setEnabled(false);
                buttonStart.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
                buttonStop.setEnabled(true);
                buttonStop.setTextColor(getResources().getColor(R.color.ef_white));

                Toast.makeText(RecordAudioActivity.this, "Recording started",
                        Toast.LENGTH_LONG).show();
            } else {
                requestPermission();
            }

        }
    });

    buttonStop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            mediaRecorder.stop();
            buttonStop.setEnabled(false);
            buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonPlayLastRecordAudio.setEnabled(true);
            buttonPlayLastRecordAudio.setTextColor(getResources().getColor(R.color.ef_white));
            buttonStart.setEnabled(true);
            buttonStart.setTextColor(getResources().getColor(R.color.ef_white));
            setAudioasMusic.setEnabled(true);
            setAudioasMusic.setTextColor(getResources().getColor(R.color.ef_white));
            buttonStopPlayingRecording.setEnabled(false);
            buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));

            Toast.makeText(RecordAudioActivity.this, "Recording Completed",
                    Toast.LENGTH_LONG).show();
        }
    });

    buttonPlayLastRecordAudio.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) throws IllegalArgumentException,
                SecurityException, IllegalStateException {

            buttonStop.setEnabled(false);
            buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonStart.setEnabled(false);
            buttonStart.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonStopPlayingRecording.setEnabled(true);
            buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_white));

            mediaPlayer = new MediaPlayer();
            try {
                mediaPlayer.setDataSource(String.valueOf(AudioSavePathInDevice));
                mediaPlayer.prepare();
            } catch (IOException e) {
                e.printStackTrace();
            }

            mediaPlayer.start();
            Toast.makeText(RecordAudioActivity.this, "Recording Playing",
                    Toast.LENGTH_LONG).show();
        }
    });

    buttonStopPlayingRecording.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.O)
        @Override
        public void onClick(View view) {
            buttonStop.setEnabled(false);
            buttonStop.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonStart.setEnabled(true);
            buttonStart.setTextColor(getResources().getColor(R.color.ef_white));
            buttonStopPlayingRecording.setEnabled(false);
            buttonStopPlayingRecording.setTextColor(getResources().getColor(R.color.ef_black_alpha_50));
            buttonPlayLastRecordAudio.setEnabled(true);
            buttonPlayLastRecordAudio.setTextColor(getResources().getColor(R.color.ef_white));
            setAudioasMusic.setEnabled(true);
            setAudioasMusic.setTextColor(getResources().getColor(R.color.ef_white));

            if(mediaPlayer != null){
                mediaPlayer.stop();
                mediaPlayer.release();
                MediaRecorderReady();
            }
        }
    });

private void requestNewInterstitial() {
    mInterstitialAd.loadAd(new AdRequest.Builder().build());
}

@Override
public void onBackPressed() {
    super.onBackPressed();
    finish();
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case RequestPermissionCode:
            if (grantResults.length> 0) {
                boolean StoragePermission = grantResults[0] ==
                        PackageManager.PERMISSION_GRANTED;
                boolean RecordPermission = grantResults[1] ==
                        PackageManager.PERMISSION_GRANTED;

                if (StoragePermission && RecordPermission) {
                    Toast.makeText(RecordAudioActivity.this, "Permission Granted",
                            Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(RecordAudioActivity.this,"Permission " +
                            "Denied",Toast.LENGTH_LONG).show();
                }
            }
            break;
    }
}
public boolean checkPermission() {
    int result = ContextCompat.checkSelfPermission(getApplicationContext(),
            WRITE_EXTERNAL_STORAGE);
    int result1 = ContextCompat.checkSelfPermission(getApplicationContext(),
            RECORD_AUDIO);
    return result == PackageManager.PERMISSION_GRANTED &&
            result1 == PackageManager.PERMISSION_GRANTED;
}
private void requestPermission() {
    ActivityCompat.requestPermissions(RecordAudioActivity.this, new
            String[]{WRITE_EXTERNAL_STORAGE, RECORD_AUDIO}, RequestPermissionCode);
}
@RequiresApi(api = Build.VERSION_CODES.O)
public void MediaRecorderReady(){
    mediaRecorder=new MediaRecorder();
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
    mediaRecorder.setOutputFile(AudioSavePathInDevice);
}

---

经过密切监测和调查，我找到了解决办法。 只需将BTNStoRecorder设置为enabled即可解决此问题

现在，对于任何可能喜欢此代码的人 只需将btnStartRecorder按钮替换为以下代码即可。 我现在很开心

btnStartRecorder.setOnClickListener(new View.OnClickListener() {
            @Override*emphasized text*
            public void onClick(View view) {
                if (checkPermissionFromDevice())
                {


                    pathSave = Environment.getExternalStorageDirectory()
                            .getAbsolutePath()+"/"
                            + UUID.randomUUID().toString()+"_audio_record.amr";
                    setupMediaRecorder();
                    try {
                        mediaRecorder.prepare();
                        mediaRecorder.start();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    btnPlay.setEnabled(false);
                    btnStop.setEnabled(false);
                    btnStopRecorder.setEnabled(true);

                    Toast.makeText(RecorderActivity.this, "Recording...", Toast.LENGTH_SHORT).show();
                }

                else {
                    requestPermission();
                }
            }
        });

---

经过密切监测和调查，我找到了解决办法。 只需将BTNStoRecorder设置为enabled即可解决此问题

现在，对于任何可能喜欢此代码的人 只需将btnStartRecorder按钮替换为以下代码即可。 我现在很开心

btnStartRecorder.setOnClickListener(new View.OnClickListener() {
            @Override*emphasized text*
            public void onClick(View view) {
                if (checkPermissionFromDevice())
                {


                    pathSave = Environment.getExternalStorageDirectory()
                            .getAbsolutePath()+"/"
                            + UUID.randomUUID().toString()+"_audio_record.amr";
                    setupMediaRecorder();
                    try {
                        mediaRecorder.prepare();
                        mediaRecorder.start();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    btnPlay.setEnabled(false);
                    btnStop.setEnabled(false);
                    btnStopRecorder.setEnabled(true);

                    Toast.makeText(RecorderActivity.this, "Recording...", Toast.LENGTH_SHORT).show();
                }

                else {
                    requestPermission();
                }
            }
        });

---

我用我的代码修复了你的代码，但我无法播放保存在内存中的录制文件。我的代码录制音频，但无法播放。这是我唯一的挑战。但它在我的应用程序中运行。我可以为您提供您尝试过的演示，先生。非常感谢。我刚刚发现了一些我没有添加的内容。你能帮我进行任何循环以保持录制，直到我按stopRecording。如果我执行onBackPressed（）以返回第二个活动，记录器将自动停止。我想继续播放，直到我返回Recorder活动并按下stop myself键我用我的代码修复了你的代码，但我无法播放保存在内存中的录制文件。我的代码录制音频，但无法播放。这是我唯一的挑战。但它在我的应用程序中运行。我可以为您提供您尝试过的演示，先生。非常感谢。我刚刚发现了一些我没有添加的内容。你能帮我进行任何循环以保持录制，直到我按stopRecording。如果我执行onBackPressed（）以返回第二个活动，记录器将自动停止。我希望它继续，直到我返回RecorderActivity并自己按stop