Android: How to Upload an image on Firebase storage?

Firebase is a mobile and web application development platform. It provides services that a web application or mobile application might require. Firebase provides secure file uploads and downloads for Firebase application.

This article explains how to build an Android application with the ability to select the image from the mobile gallery and upload images to Firebase Storage.

Here are the detailed steps:

• Step 1. Create a new project on android studio or open an existing project in which you want to add authentication and add the firebase to that android application.
• Step 2. Add the firebase storage dependency in build.gradle (Module:app)file. Latest Dependency for firebase storage is:

  implementation 'com.google.firebase:firebase-storage:19.1.0'

• Step 3. Setting up the activity_main.xml layout file
  The activity_main.xml layout file consists of:
  1. Two layouts: nesting linear layout inside relative layout
  2. Two buttons:
     • one for selecting an image from gallery
     • other button is for uploading an image on firebase storage on the cloud
  3. An image view in which image is shown chosen from the gallery

  Here is complete code for activity_main.xml:

  activity_main.xml

  
  

  
  
  

  <?xml version="1.0" encoding="utf-8"?> <RelativeLayout      xmlns:android="https://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="16dp"     tools:context=".MainActivity">     <!--Linear Layout with horizontal orientation      and other properties-->  <LinearLayout     android:id="@+id/layout_button"     android:orientation="horizontal"     android:layout_alignParentTop="true"     android:weightSum="2"     android:layout_width="match_parent"     android:layout_height="wrap_content">        <!--Button for choosing image from gallery-->     <Button         android:id="@+id/btnChoose"         android:text="Choose"         android:layout_weight="1"         android:layout_width="0dp"         android:layout_height="wrap_content" />        <!--Button for uploading image-->     <Button         android:id="@+id/btnUpload"         android:text="Upload"         android:layout_weight="1"         android:layout_width="0dp"         android:layout_height="wrap_content" /> </LinearLayout>        <!--Image View for showing image chosen from gallery-->     <ImageView         android:id="@+id/imgView"         android:layout_width="match_parent"         android:layout_height="match_parent" /> </RelativeLayout>

• Step 4. Setting up MainActivity.java file
  In MainActivity
  • Set listeners on interaction of defined button views. On interaction, you want to call a method that triggers either the selection of an image from the gallery or the uploading of the selected image to Firebase storage. setOnClickListener is used for that action on interaction.
  • When SelectImage method is called, a new Intent instance is created. The intent type is set to image, and its action is set to get some content. The intent creates an image chooser dialog that allows the user to search through the device gallery to select the image from the gallery.
  • startActivityForResult is used to receive the result, which is the selected image.
  • To display this image, make use of a method called onActivityResult(). onActivityResult receives a request code, result code, and the data. Check in this method, if the request code equals PICK_IMAGE_REQUEST, with the result code equal to RESULT_OK and the data available. If all this is true, display the selected image in the ImageView below buttons.
  • Override the startActivityForResult method and write its implementation.
  • Also in uploadImage() method, Firebase storage reference is taken and putFile() function is used to upload the image to firebase storage with success and failure listeners. If an image is uploaded than success toast is there otherwise failure toast is there.

  MainActivity.java

  
  

  
  
  

  package com.neveropen.uploadimagetofirebase;    import android.app.ProgressDialog; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.net.Uri; import android.provider.MediaStore; import android.support.annotation.Nullable; import android.support.v7.app.ActionBar; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast;    import java.io.IOException; import java.util.UUID;    public class MainActivity extends AppCompatActivity {        // views for button     private Button btnSelect, btnUpload;        // view for image view     private ImageView imageView;        // Uri indicates, where the image will be picked from     private Uri filePath;        // request code     private final int PICK_IMAGE_REQUEST = 22;        // instance for firebase storage and StorageReference     FirebaseStorage storage;     StorageReference storageReference;        @Override     protected void onCreate(Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);            ActionBar actionBar;         actionBar = getSupportActionBar();         ColorDrawable colorDrawable             = new ColorDrawable(                 Color.parseColor("#0F9D58"));         actionBar.setBackgroundDrawable(colorDrawable);            // initialise views         btnSelect = findViewById(R.id.btnChoose);         btnUpload = findViewById(R.id.btnUpload);         imageView = findViewById(R.id.imgView);            // get the Firebase  storage reference         storage = FirebaseStorage.getInstance();         storageReference = storage.getReference();            // on pressing btnSelect SelectImage() is called         btnSelect.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v)             {                 SelectImage();             }         });            // on pressing btnUpload uploadImage() is called         btnUpload.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v)             {                 uploadImage();             }         });     }        // Select Image method     private void SelectImage()     {            // Defining Implicit Intent to mobile gallery         Intent intent = new Intent();         intent.setType("image/*");         intent.setAction(Intent.ACTION_GET_CONTENT);         startActivityForResult(             Intent.createChooser(                 intent,                 "Select Image from here..."),             PICK_IMAGE_REQUEST);     }        // Override onActivityResult method     @Override     protected void onActivityResult(int requestCode,                                     int resultCode,                                     Intent data)     {            super.onActivityResult(requestCode,                                resultCode,                                data);            // checking request code and result code         // if request code is PICK_IMAGE_REQUEST and         // resultCode is RESULT_OK         // then set image in the image view         if (requestCode == PICK_IMAGE_REQUEST             && resultCode == RESULT_OK             && data != null             && data.getData() != null) {                // Get the Uri of data             filePath = data.getData();             try {                    // Setting image on image view using Bitmap                 Bitmap bitmap = MediaStore                                     .Images                                     .Media                                     .getBitmap(                                         getContentResolver(),                                         filePath);                 imageView.setImageBitmap(bitmap);             }                catch (IOException e) {                 // Log the exception                 e.printStackTrace();             }         }     }        // UploadImage method     private void uploadImage()     {         if (filePath != null) {                // Code for showing progressDialog while uploading             ProgressDialog progressDialog                 = new ProgressDialog(this);             progressDialog.setTitle("Uploading...");             progressDialog.show();                // Defining the child of storageReference             StorageReference ref                 = storageReference                       .child(                           "images/"                           + UUID.randomUUID().toString());                // adding listeners on upload             // or failure of image             ref.putFile(filePath)                 .addOnSuccessListener(                     new OnSuccessListener<UploadTask.TaskSnapshot>() {                            @Override                         public void onSuccess(                             UploadTask.TaskSnapshot taskSnapshot)                         {                                // Image uploaded successfully                             // Dismiss dialog                             progressDialog.dismiss();                             Toast                                 .makeText(MainActivity.this,                                           "Image Uploaded!!",                                           Toast.LENGTH_SHORT)                                 .show();                         }                     })                    .addOnFailureListener(new OnFailureListener() {                     @Override                     public void onFailure(@NonNull Exception e)                     {                            // Error, Image not uploaded                         progressDialog.dismiss();                         Toast                             .makeText(MainActivity.this,                                       "Failed " + e.getMessage(),                                       Toast.LENGTH_SHORT)                             .show();                     }                 })                 .addOnProgressListener(                     new OnProgressListener<UploadTask.TaskSnapshot>() {                            // Progress Listener for loading                         // percentage on the dialog box                         @Override                         public void onProgress(                             UploadTask.TaskSnapshot taskSnapshot)                         {                             double progress                                 = (100.0                                    * taskSnapshot.getBytesTransferred()                                    / taskSnapshot.getTotalByteCount());                             progressDialog.setMessage(                                 "Uploaded "                                 + (int)progress + "%");                         }                     });         }     } }

Output:

• Main Activity
  

  Main Activity containing buttons for choosing and uploading image

• Choose image from gallery
  

  Main Activity with image view having image chosen from gallery

• The uploaded image on firebase console:
  

  registered users