android - 我第二次按下录制按钮时，我的应用程序崩溃了

Question

这是我的代码 fragment 。

private fun record() {                                                          

    recorder.setAudioSource(MediaRecorder.AudioSource.MIC)                      
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)              
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)                
    val path: File = filesDir                                                  
    try {                                                                      
        tempFile = File.createTempFile("audioTemp", ".3gp", path)              
    } catch (e: IOException) {                                                  
        Log.d("recording error", "recording error:", e)                        
    } catch (e: FileAlreadyExistsException) {                                  
        Log.d("File already Exist", e.toString())                              
    }                                                                          

    recorder.setOutputFile(tempFile?.absolutePath)                              
    try {                                                                      
        recorder.prepare()                                                      
    } catch (e: IOException) {                                                  
        Log.d("recording error", "recording error:", e)                        
    }                                                                          
    recorder.start()                                                            
}                                                                              

private fun stopRecord() {                                                      
    recorder.stop()                                                            
    recorder.release()                                                          
    button_play_sample.isEnabled = true                                        
    button_record.isEnabled = true                                              
    player.setOnCompletionListener(this)                                        
    try {                                                                      
        player.setDataSource(tempFile?.absolutePath)                            
    } catch (e: IOException) {                                                  
        Log.d("stop recording error", "Stop Recording Error:", e)              
    }                                                                          
    try {                                                                      
        player.prepare()                                                        
    } catch (e: IOException) {                                                  
        Log.d("recording error", "recording error:", e)                        
    }                                                                          
}                                                                              

private fun play() {                                                            
    player.start()                                                              
    button_record.isEnabled = false                                            
}                                                                              

override fun onCompletion(mp: MediaPlayer?) {                                  
    handler = Handler()                                                        
    handler?.postDelayed({button_record.isEnabled = true}, 1000)                
}

我不知道为什么，但我有一个录制音频的录制按钮。当 Activity 第一次加载时，记录加载。当我第二次按下它时，因为我不喜欢我的第一次录音，而不是覆盖旧文件并重新设置录音，应用程序反而崩溃了。

Answer 1

在Android Developer Guide , 它说

When you are done with the MediaRecorder instance free its resources as soon as possible by calling release().

看这个sample code来自开发者网站:

private void stopRecording() {
    recorder.stop();
    recorder.release();
    recorder = null;
}

您的代码 fragment 不会检查是否正在使用 recorder。您可能希望在再次使用 MediaRecorder 对象之前执行此操作。

private fun record() {
    if (recording) {
        stopRecording()
    }

    // do recording snippet here...
}