android - 如何将位图保存到 Firebase

Question

我创建了一个裁剪图像的简单应用程序。现在我想把这个图像保存到 Fire base 。

photo.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            //Intent imageDownload = new 
Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
      Intent imageDownload=new Intent();
      imageDownload.setAction(Intent.ACTION_GET_CONTENT);
      imageDownload.setType("image/*");
      imageDownload.putExtra("crop", "true");
      imageDownload.putExtra("aspectX", 1);
      imageDownload.putExtra("aspectY", 1);
      imageDownload.putExtra("outputX", 200);
      imageDownload.putExtra("outputY", 200);
      imageDownload.putExtra("return-data", true);
      startActivityForResult(imageDownload, GALLERY_REQUEST_CODE);


        }
    });
 }
  @Override
protected void onActivityResult(int requestCode, int resultCode, Intent 
  data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == GALLERY_REQUEST_CODE && resultCode == RESULT_OK && 
   data != null) {
        Bundle extras = data.getExtras();
        image = extras.getParcelable("data");
        photo.setImageBitmap(image);

   }






}

如何将此图像保存到 Firebase。我尝试了很多教程但未能成功。请用简单的代码验证。

Answer 1

您必须首先将 Firebase 存储的依赖项添加到您的 build.gradle 文件中:

compile 'com.google.firebase:firebase-storage:10.0.1'
compile 'com.google.firebase:firebase-auth:10.0.1'

然后创建一个 FirebaseStorage 实例:

FirebaseStorage storage = FirebaseStorage.getInstance();

要将文件上传到 Firebase 存储，您首先要创建对文件完整路径的引用，包括文件名。

// Create a storage reference from our app
StorageReference storageRef = storage.getReferenceFromUrl("gs://<your-bucket-name>");

// Create a reference to "mountains.jpg"
StorageReference mountainsRef = storageRef.child("mountains.jpg");

// Create a reference to 'images/mountains.jpg'
StorageReference mountainImagesRef = storageRef.child("images/mountains.jpg");

// While the file names are the same, the references point to different files
mountainsRef.getName().equals(mountainImagesRef.getName());    // true
mountainsRef.getPath().equals(mountainImagesRef.getPath());    // false

创建适当的引用后，您可以调用 putBytes()、putFile() 或 putStream() 方法将文件上传到 Firebase 存储。

putBytes() 方法是将文件上传到 Firebase 存储的最简单方法。 putBytes() 接受一个 byte[] 并返回一个 UploadTask，您可以使用它来管理和监控上传状态。

// Get the data from an ImageView as bytes
imageView.setDrawingCacheEnabled(true);
imageView.buildDrawingCache();
Bitmap bitmap = imageView.getDrawingCache();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] data = baos.toByteArray();

UploadTask uploadTask = mountainsRef.putBytes(data);
uploadTask.addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        // Handle unsuccessful uploads
    }
}).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
    @Override
    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
        // taskSnapshot.getMetadata() contains file metadata such as size, content-type, and download URL.
        Uri downloadUrl = taskSnapshot.getDownloadUrl();
    }
});