MediaRecorder启动失败报错-2147483648，通话录音APP崩溃求助

场景与核心代码 #

开发通话录音APP时使用MediaRecorder类，实体设备运行时触发崩溃，核心实现代码如下：

public void startRecord(){        
    String error = "";        
    mediaRecorder = new MediaRecorder();        
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);        
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);        
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        
    mediaRecorder.setAudioEncodingBitRate(16);        
    mediaRecorder.setAudioSamplingRate(44100);

    // 设置输出文件路径        
    String outputFilePath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/test.mp3" ;        
    System.out.println(outputFilePath);        
    mediaRecorder.setOutputFile(outputFilePath);

    try {
        mediaRecorder.prepare();            
        mediaRecorder.start();            
        mediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener() {                
            @Override                
            public void onError(MediaRecorder mediaRecorder, int i, int i1) {                    
                System.out.println(mediaRecorder);                    
                System.out.println(i);                    
                System.out.println(i1);                
            }            
        });            
        error = "Start Record";
    } catch (IOException e) {            
        e.printStackTrace();            
        error = e.getMessage();            
        System.out.println(e.getMessage());
    }
}

错误日志 #

start failed: -2147483648
2023-10-15 23:05:21.957  1750-1750  AndroidRuntime          com.team71.callrecording             D  Shutting down VM
2023-10-15 23:05:21.962  1750-1750  AndroidRuntime          com.team71.callrecording             E  FATAL EXCEPTION: main                                                                                                    Process: com.team71.callrecording, PID: 1750                                                                                                    java.lang.RuntimeException: start failed.                                                                                                        at android.media.MediaRecorder.start(Native Method)                                                                                                        at com.team71.callrecording.StartRecording.startRecord(StartRecording.java:34)                                                                                                        at com.team71.callrecording.MainActivity$2.onClick(MainActivity.java:60)                                                                                                        at android.view.View.performClick(View.java:7505)                                                                                                        at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1213)                                                                                                        at android.view.View.performClickInternal(View.java:7477)                                                                                                        at android.view.View.access$3600(View.java:824)                                                                                                        at android.view.View$PerformClick.run(View.java:28652)                                                                                                        at android.os.Handler.handleCallback(Handler.java:938)                                                                                                        at android.os.Handler.dispatchMessage(Handler.java:99)                                                                                                        at android.os.Looper.loop(Looper.java:257)                                                                                                        at android.app.ActivityThread.main(ActivityThread.java:8218)                                                                                                        at java.lang.reflect.Method.invoke(Native Method)                                                                                                        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:626)                                                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1016)

1. 权限检查与适配 #

• 确保已申请并授予以下权限，Android 6.0+需动态申请：
  • RECORD_AUDIO：基础录音权限
  • READ_EXTERNAL_STORAGE/WRITE_EXTERNAL_STORAGE（Android 13+用READ_MEDIA_AUDIO替代）：文件读写权限
  • READ_PHONE_STATE：部分机型获取通话音频源的必要权限
• 注意：VOICE_CALL音频源在部分Android版本或国产ROM中被厂商限制，若无法使用，可降级为VOICE_COMMUNICATION或MIC作为替代方案。

2. 修复音频参数不兼容问题 #

• 格式与后缀不匹配：输出格式设为MPEG_4，但文件后缀是.mp3，将文件名改为test.m4a，或把输出格式改为MediaRecorder.OutputFormat.THREE_GPP（对应.3gp）
• 比特率设置错误：setAudioEncodingBitRate(16)数值过小，AMR_NB标准比特率为12200左右，建议改为128000（通用音频比特率）
• 采样率与编码器冲突：AMR_NB不支持44100Hz采样率，改为8000Hz（AMR_NB标准采样率）；若需保留44100Hz，将编码器改为MediaRecorder.AudioEncoder.AAC

3. 调整代码逻辑 #

• 提前设置错误监听器：当前在start()后设置监听器，无法捕获启动时的错误，需移至prepare()之前：

  mediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener() {
      @Override
      public void onError(MediaRecorder mediaRecorder, int i, int i1) {
          Log.e("RecorderError", "Error code: " + i + ", extra: " + i1);
      }
  });
  mediaRecorder.prepare();
  mediaRecorder.start();
  

• 规范文件路径处理：避免直接拼接字符串，用File类确保路径有效性：

  File outputFile = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS), "test.m4a");
  mediaRecorder.setOutputFile(outputFile.getAbsolutePath());
  

4. 适配系统与机型限制 #

• Android 10及以上版本，VOICE_CALL音频源可能被系统限制，可尝试使用MediaProjection API（需用户授权屏幕录制权限，可间接捕获通话音频）
• 部分国产ROM（如小米、华为）需在系统设置中单独开启APP的通话录音权限

内容的提问来源于stack exchange，提问作者Rumion Tomal