保存 Android mediaRecorder 输出并将其上传到 Firebase 存储

Question

我正在尝试捕获 Android 记录并将其发送到 Firebase 存储。我似乎正在输出音频文件（如日志所示，它不为空），并且发生了 Firebase 上传。但是，上传是空的。我怀疑这个问题发生在我如何保存输出和将其转换为字节数组之间。另外，我对字节数组以及如何使用它们知之甚少，所以我可能会遗漏一些明显的东西。 我也在片段中运行所有这些。

fileName = Objects.requireNonNull(Objects.requireNonNull(getActivity()).getExternalCacheDir()).getAbsolutePath();
fileName += "/audiorecordtest.3gp";

当我按下开始时，我运行这个：

recorder = new MediaRecorder();
                        
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setOutputFile(fileName);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

                        try {
                            recorder.prepare();
                        } catch (IOException e) {
                            Log.e(TAG, "prepare() failed");
                        }

                        recorder.start();
                    

当我按下停止时，我运行这个：

recorder.stop();
recorder.release();
recorder = null;

然后我准备 Firebase 上传录音：

StorageMetadata metadata = new StorageMetadata.Builder()
                                        .setContentType("audio/mpeg")
                                        .build();
UploadTask uploadTask = voiceRef.child(newMessage).putBytes(fileName.getBytes(), metadata);

如果需要，这里是完整的 Firebase 上传：

uploadTask.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
                                    @Override
                                    public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                                        double progress = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
                                        //int progressInt = (int) progress;
                                        System.out.println("Upload is " + progress + "% done");
                                        //progressBar.setProgress(progressInt);
                                    }
                                }).addOnPausedListener(new OnPausedListener<UploadTask.TaskSnapshot>() {
                                    @Override
                                    public void onPaused(UploadTask.TaskSnapshot taskSnapshot) {
                                        System.out.println("Upload is paused");
                                    }
                                }).addOnFailureListener(new OnFailureListener() {
                                    @Override
                                    public void onFailure(@NonNull Exception exception) {
                                        System.out.println("Upload Failed! Please try again.");
                                    }
                                }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                                    @Override
                                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {


                                        voiceRef.child(newMessage).getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                                            @Override
                                            public void onSuccess(Uri uri) {

                                                Message.Voice voice = new Message.Voice(uri.toString(), timeInt);
                                                Author author = new Author(UserID, UserName, null, false); //UserID, UserName
                                                Message message = new Message(newMessage, author, UserID, null, "sent", Header, null);
                                                message.setVoice(voice);

                                                //The completion listener is added here as this prevents an odd occurrencee of the onChildListener
                                                //in the messages fragment firing twice when this activity is exited too quickly.
                                                myMessageRoomRef.child(newMessage).setValue(message, new DatabaseReference.CompletionListener() {
                                                    @Override
                                                    public void onComplete(DatabaseError databaseError, @NonNull DatabaseReference databaseReference) {
                                                        if (databaseError != null) {
                                                            System.out.println("Data could not be saved " + databaseError.getMessage());
                                                        } else {
                                                            System.out.println("Data saved successfully.");
                                                            Objects.requireNonNull(getActivity()).finish();
                                                        }
                                                    }
                                                });
                                            }
                                        });
                                    }
                                });

Answer 1

fileName.getBytes() 只返回文件路径的字节数组表示。它不包含文件本身中的任何数据。如果你检查那个数组的长度，它会很小。

如果您有要上传的文件，您需要告诉 Firebase Storage SDK 文件的名称，然后按照uploading from a local file 文档中的说明进行操作。您的代码将像这样开始：

Uri file = Uri.fromFile(new File(fileName));
uploadTask = voiceRef.putFile(file);