Question

我是Android和Firebase的初学者。我想将文件加载到Firebase存储中，并在上传完成后显示进度栏。

我正在从一个活动中调用方法，该活动将文件加载到Firebase存储中。方法是：

public void uploadNewAudio(String filename, final String photoid, final String groupid, Context mContext,final ProgressBar progressBar){
        progressBar.setVisibility(View.VISIBLE);
        FilePaths filePaths = new FilePaths();
        if(groupid==null) {
            final String user_id = FirebaseAuth.getInstance().getCurrentUser().getUid();
            final StorageReference storageReference = mStorageReference
                    .child(filePaths.FIREBASE_AUDIO_STORAGE + "/" + user_id + "/" + photoid);
            Uri uri = Uri.fromFile(new File(filename));
            UploadTask uploadTask = null;
            uploadTask = storageReference.putFile(uri);

            Task<Uri> urlTask = uploadTask.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                    double progress = (100.0 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();
                    System.out.println("Upload is " + progress + "% done");
                    int currentprogress = (int) progress;
                    progressBar.setProgress(currentprogress);
                }
            }).continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
                @Override
                public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
                    if (!task.isSuccessful()) {
                        throw task.getException();
                    }

                    // Continue with the task to get the download URL
                    return storageReference.getDownloadUrl();
                }
            }).addOnCompleteListener(new OnCompleteListener<Uri>() {
                @Override
                public void onComplete(@NonNull Task<Uri> task) {
                    if (task.isSuccessful()) {
                        Uri firebaseUrl = task.getResult();
                        Toast.makeText(FirebaseMethods.this.mContext, "audio upload success", Toast.LENGTH_SHORT).show();
                        changeAudioPath(firebaseUrl.toString(), photoid,user_id);
                        progressBar.setVisibility(View.GONE);

                    } else {
                        Log.d(TAG, "onFailure: audio upload failed.");
                        Toast.makeText(FirebaseMethods.this.mContext, "audio upload failed ", Toast.LENGTH_SHORT).show();

                    }
                }
            });
        }
}

我想暂停UI线程，直到上传完成并显示进度条，但是由于它是异步活动，因此会调用一个新活动（应在上传完成后发生），并且代码将继续执行。如何阻止这种情况的发生，并仅在上传完成后才调用新活动。

如何显示进度条以显示文件上传到Firebase存储的进度？

0 个答案: