How to check if a file exists in Firebase storage from your android application?

Question

I am developing android application where a user clicks image, it gets stored in firebase, cloud functions process this image and stores the output back in the firebase in t

Answer 1

You can use getDownloadURL which returns a Promise, which can in turn be used to catch a "not found" error, or process the file if it exists. For example:

    storageRef.child("file.png").getDownloadURL().then(onResolve, onReject);

function onResolve(foundURL) { 
//stuff 
} 
function onReject(error){ 
//fill not found
console.log(error.code); 
}

Updated

This is another simpler and cleaner solution.

storageRef.child("users/me/file.png").getDownloadUrl().addOnSuccessListener(new OnSuccessListener() {
    @Override
    public void onSuccess(Uri uri) {
        // Got the download URL for 'users/me/profile.png'
    }
}).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        // File not found
    }
});