如何将位图保存到Firebase
问题描述:
我创建了一个裁剪图像的简单应用程序。现在我想将这张图片保存到Fire基地。如何将位图保存到Firebase
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);
}
}
如何将此图片保存到Firebase。我尝试了很多教程,但无法成功。请用简单的代码进行验证。
答
火力地堡不支持二进制数据,所以你需要将图像数据转换为base64或使用Firebase Storage
方法1(推荐)
sref = FirebaseStorage.getInstance().getReference(); // please go to above link and setup firebase storage for android
public void uploadFile(Uri imagUri) {
if (imagUri != null) {
final StorageReference imageRef = sref.child("android/media") // folder path in firebase storage
.child(imagUri.getLastPathSegment());
photoRef.putFile(imagUri)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot snapshot) {
// Get the download URL
Uri downloadUri = snapshot.getMetadata().getDownloadUrl();
// use this download url with imageview for viewing & store this linke to firebase message data
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
// show message on failure may be network/disk ?
}
});
}
}
方法2
public void getImageData(Bitmap bmp) {
ByteArrayOutputStream bao = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, bao); // bmp is bitmap from user image file
bmp.recycle();
byte[] byteArray = bYtE.toByteArray();
String imageB64 = Base64.encodeToString(byteArray, Base64.DEFAULT);
// store & retrieve this string to firebase
}
答
您必须先添加Firebase存储的依存关系您的build.gradle文件:
compile 'com.google.firebase:firebase-storage:10.0.1'
compile 'com.google.firebase:firebase-auth:10.0.1'
然后创建FirebaseStorage的一个实例:
FirebaseStorage storage = FirebaseStorage.getInstance();
要上传文件到火力地堡寄存,首先要创建该文件的完整路径的引用,其中包括文件名。
// 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
一旦你创建了一个合适的参考,你再调用putBytes(),PUTFILE(),或putStream()方法来把文件上传到火力地堡存储。
putBytes()方法是将文件上传到Firebase存储的最简单方法。 putBytes()需要一个byte []并返回一个UploadTask,您可以使用它来管理和监视上载状态。
// 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();
}
});
+0
如果我想这个位图转换为URI,这样的话怎么可能呢? –
*我试过很多教程,但未能成功,* .... **链接或它没有发生** – Selvin