如何将位图保存到 Firebase [英] How to save bitmap to Firebase

问题描述

我创建了一个简单的应用程序来裁剪图像.现在我想将此图像保存到 Fire base 中.

I created a simple application which crop the image . Now I want to save this image to the 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，但都没有成功.请用简单的代码验证.

How to save this image to the Firebase . I tried many tutorial but could not succeed . Please verify with simple code .

推荐答案

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

you must first add the dependencies for Firebase Storage to your build.gradle file:

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:

then create an instance of FirebaseStorage:

FirebaseStorage storage = FirebaseStorage.getInstance();

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

To upload a file to Firebase Storage, you first create a reference to the full path of the file, including the file name.

// 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.

Once you've created an appropriate reference, you then call the putBytes(), putFile(), or putStream() method to upload the file to Firebase Storage.

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的状态.

The putBytes() method is the simplest way to upload a file to Firebase Storage. putBytes() takes a byte[] and returns an UploadTask that you can use to manage and monitor the status of the upload.

// 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();
    }
});

这篇关于如何将位图保存到 Firebase的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！