使用Firebase上传异步多张照片 [英] Asynchronous multiple photos upload with Firebase

问题描述

使用Firebase上传多张照片时出现问题。我的问题是，当我循环的照片上传UploadTask似乎工作在一个单独的线程，所以循环遍历所有照片，而第一张照片仍然上传
我想上传他们一个，所以循环除非已经上传第一张照片，否则不要迭代到下一张照片

  @Override 
 public boolean onOptionsItemSelected（final MenuItem item）{
 switch（item.getItemId（））{
 case R.id.add_photo_option：
 item.setEnabled（false）; 
 final ProgressDialog dialog = new ProgressDialog（getActivity（））; 
 dialog.setProgressStyle（ProgressDialog.STYLE_SPINNER）; 
 for（int x = 0; x  int photoNumber = x + 1; 
 dialog.setTitle（上传照片编号：+ photoNumber）; 
 dialog.show（）; 
 ImageAdapter adapter =（ImageAdapter）photosList.getAdapter（）; 
 Uri photoUri = adapter.getPhotoUri（x）; 
 String path =photos /+ UUID.randomUUID（）+.png; 
 StorageReference storage = mStorageRef.getReference（path）; 
 UploadTask task = storage.putFile（photoUri）; 
 task.addOnProgressListener（getActivity（），new OnProgressListener< UploadTask.TaskSnapshot>（）{
 @Override 
 public void onProgress（UploadTask.TaskSnapshot taskSnapshot）{
 long progress = taskSnapshot .getBytesTransferred（）; 
 long totalBytes = taskSnapshot.getTotalByteCount（）; 
 dialog.setMessage（上传：+ progress +KBs+ totalBytes +KBs）; 
 } 
}）; 
 task.addOnSuccessListener（getActivity（），new OnSuccessListener< UploadTask.TaskSnapshot>（）{
 @Override 
 public void onSuccess（UploadTask.TaskSnapshot taskSnapshot）{
 dialog.setMessage 上传）; 
 item.setEnabled（true）; 
 Toast.makeText（getActivity（），taskSnapshot.getDownloadUrl（）。toString（），Toast.LENGTH_SHORT）.show（）; 
} 
}）; 
} 
 dialog.dismiss（）; 
返回true; 
默认：
返回super.onOptionsItemSelected（item）; 
 
 
 
 $ div $解析方案

可以给你一个算法（只是回答它的JS）：



  //设置
 firebase。 storage（）。ref（）。constructor.prototype.putFiles = function（files）{
 var ref = this; 
 return Promise.all（files.map（function（file）{
 return ref.child（file.name）.putFile（file）; 
}））; 
} 
 
 //使用它！ 
 firebase.storage（）.ref（）。putFiles（files）.then（function（metadatas）{
 //获取文件元数据
}）。catch（function（error ）{
 //如果任何任务失败，请处理这个
}）; 
  

您可以使用Android Tasks.whenAll （ docs ， blog post ）做类似的事情：创建一个任务数组，然后使用 whenAll ）将其踢出。

Can anyone help me please.

I have a problem uploading multiple photos with Firebase. My problem is that when I loop through the photos to be uploaded the UploadTask seems to work on a separate thread so the loop iterates through all photos while the first photo still uploads I want to upload them one by one so the loop don't iterate to the next photo unless the first photo have been uploaded

@Override
public boolean onOptionsItemSelected(final MenuItem item) {
    switch(item.getItemId()){
        case R.id.add_photo_option:
            item.setEnabled(false);
            final ProgressDialog dialog = new ProgressDialog(getActivity());
            dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            for (int x = 0; x < photosList.getAdapter().getItemCount(); x++){
                int photoNumber = x+1;
                dialog.setTitle("Uploading photo no: " + photoNumber);
                dialog.show();
                ImageAdapter adapter = (ImageAdapter) photosList.getAdapter();
                Uri photoUri = adapter.getPhotoUri(x);
                String path = "photos/" + UUID.randomUUID() + ".png";
                StorageReference storage = mStorageRef.getReference(path);
                UploadTask task = storage.putFile(photoUri);
                task.addOnProgressListener(getActivity(), new OnProgressListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                        long progress = taskSnapshot.getBytesTransferred();
                        long totalBytes = taskSnapshot.getTotalByteCount();
                        dialog.setMessage("Uploading: " + progress + " KBs out of " + totalBytes + " KBs");
                    }
                });
                task.addOnSuccessListener(getActivity(), new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        dialog.setMessage("Uploaded");
                        item.setEnabled(true);
                        Toast.makeText(getActivity(), taskSnapshot.getDownloadUrl().toString(), Toast.LENGTH_SHORT).show();
                    }
                });
            }
            dialog.dismiss();
            return true;
        default:
        return super.onOptionsItemSelected(item);
    }
}

解决方案

I can give you an for the algorithm (just answered it for JS):

// set it up
firebase.storage().ref().constructor.prototype.putFiles = function(files) { 
  var ref = this;
  return Promise.all(files.map(function(file) {
    return ref.child(file.name).putFile(file);
  }));
}

// use it!
firebase.storage().ref().putFiles(files).then(function(metadatas) {
  // Get an array of file metadata
}).catch(function(error) {
  // If any task fails, handle this
});

You can use the Android Tasks.whenAll (docs, blog post) to do a similar thing: create an array of tasks, then use a whenAll() to kick them off.

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