How to Upload PDF Files in Firebase Storage in Android? - GeeksforGeeks

22 Feb, 2021
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 the Firebase application. This article explains how to build an Android application with the ability to select the pdf from the mobile phone and upload that pdf to the Firebase Storage.
Step 1: Create a New Project
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language. And add firebase to your project or you can refer to Adding Firebase to Android App.
Step 2: Add the dependency in the build.gradle (Module : app) file
Navigate to the Gradle Scripts > build.gradle (Module : app) and add the below dependency in the dependencies section. 
implementation ‘com.google.firebase:firebase-storage:16.0.4’
implementation fileTree(dir: ‘libs’, include: [‘*.jar’])
After adding this dependency sync your project and now we will move towards its implementation.  
Step 3: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. 
XML
<?xml version="1.0" encoding="utf-8"?><LinearLayout     xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:orientation="vertical"    tools:context=".MainActivity">      <ImageView        android:id="@+id/uploadpdf"        android:layout_width="200dp"        android:layout_height="200dp"        android:src="@drawable/ic_picture_as_pdf_black_24dp" />      <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Upload A Pdf"        android:textSize="22sp"        android:textStyle="bold" />  </LinearLayout>
Step 4: Working with the MainActivity.java file
Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.
Java
import android.app.ProgressDialog;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.widget.ImageView;import android.widget.Toast;  import androidx.annotation.NonNull;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;  import com.google.android.gms.tasks.Continuation;import com.google.android.gms.tasks.OnCompleteListener;import com.google.android.gms.tasks.Task;import com.google.firebase.storage.FirebaseStorage;import com.google.firebase.storage.StorageReference;  public class MainActivity extends AppCompatActivity {      ImageView upload;    Uri imageuri = null;      @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        upload = findViewById(R.id.uploadpdf);          // After Clicking on this we will be        // redirected to choose pdf        upload.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent galleryIntent = new Intent();                galleryIntent.setAction(Intent.ACTION_GET_CONTENT);                  // We will be redirected to choose pdf                galleryIntent.setType("application/pdf");                startActivityForResult(galleryIntent, 1);            }        });    }      ProgressDialog dialog;      @Override    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (resultCode == RESULT_OK) {                          // Here we are initialising the progress dialog box            dialog = new ProgressDialog(this);            dialog.setMessage("Uploading");              // this will show message uploading            // while pdf is uploading            dialog.show();            imageuri = data.getData();            final String timestamp = "" + System.currentTimeMillis();            StorageReference storageReference = FirebaseStorage.getInstance().getReference();            final String messagePushID = timestamp;            Toast.makeText(MainActivity.this, imageuri.toString(), Toast.LENGTH_SHORT).show();              // Here we are uploading the pdf in firebase storage with the name of current time            final StorageReference filepath = storageReference.child(messagePushID + "." + "pdf");            Toast.makeText(MainActivity.this, filepath.getName(), Toast.LENGTH_SHORT).show();            filepath.putFile(imageuri).continueWithTask(new Continuation() {                        @Override                        public Object then(@NonNull Task task) throws Exception {                            if (!task.isSuccessful()) {                                throw task.getException();                            }                            return filepath.getDownloadUrl();                        }                    }).addOnCompleteListener(new OnCompleteListener<Uri>() {                @Override                public void onComplete(@NonNull Task<Uri> task) {                    if (task.isSuccessful()) {                        // After uploading is done it progress                        // dialog box will be dismissed                        dialog.dismiss();                        Uri uri = task.getResult();                        String myurl;                        myurl = uri.toString();                        Toast.makeText(MainActivity.this, "Uploaded Successfully", Toast.LENGTH_SHORT).show();                    } else {                        dialog.dismiss();                        Toast.makeText(MainActivity.this, "UploadedFailed", Toast.LENGTH_SHORT).show();                    }                }            });        }    }}
Firebase Storage:
Github Link.
android
Firebase
Technical Scripter 2020
Android
Java
Technical Scripter
Java
Android
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
Comments
Old Comments
Retrofit with Kotlin Coroutine in Android
Android Listview in Java with Example
How to Read Data from SQLite Database in Android?
How to Change the Background Color After Clicking the Button in Android?
Flutter - Custom Bottom Navigation Bar
Arrays in Java
Split() String method in Java with examples
For-each loop in Java
Arrays.sort() in Java with examples
Initialize an ArrayList in Java