Firebase Cloud Storage Notes

 

useful videos/blogs : 

https://youtu.be/lPf065fqmF4




We have 3 main methods used during Insertion of files :

putBytes( ) , putStream( ) , putFile( )

putStream() is the recommended method to use for any type of file insertion.


putBytes( ) / getBytes( ) first reads / loads all the bytes into ram before doing any operation , hence it takes Ram , due to this it is not used for large file insertion or fetching.


------------------------------------------------------------------------------------------------------

Firebase Important Points :


Firebase Storage is used to store Documents , Videos & Photos 

(Data is stored on Google Cloud Platform)

You cannot store data directly to the root folder , you have to create folders and then insert data inside them.







--------------------------------------------------------------------------------------------------


useful video : https://youtu.be/lY3xE25yGCE



INSERT SIMPLE TEXT FILE INTO STORAGE.



package com.deepesh.firebaselearningapp;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;


public class MainActivity extends AppCompatActivity{

    private static final String TAG = "TAG";
    TextView tetxview1;
    EditText userinput_editText;

    // Get the reference of your Storage Location.
    StorageReference storage_ref;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // initialises all fields
        init();



    }



    private void init(){

       tetxview1=findViewById(R.id.tetxview1);
       userinput_editText=findViewById(R.id.userinput_editText);

       // Gets reference to the given Folder/Directory inside the Storage.
        // Creates one if not present.
        // if nothing passed , it gives reference to root folder of the storage.
       storage_ref = FirebaseStorage.getInstance().getReference("docs/");
    }


    // user clicks button
    public void InsertData(View view) {

        String userinput = userinput_editText.getText().toString();

        // gets reference of the given path
        // Creates one if not present.
        StorageReference child_ref = storage_ref.child("myfiles/my_text.txt");

        // write inside the document file.
       UploadTask uploadTask = child_ref.putBytes(userinput.getBytes());

       uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
           @Override
           public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
               tetxview1.setText("Sucess");
           }
       });

       uploadTask.addOnFailureListener(new OnFailureListener() {
           @Override
           public void onFailure(@NonNull Exception e) {
               tetxview1.setText("Failure due to : " + e.getMessage());
           }
       });


    }


    // user clicks button
    public void ReadData(View view) {


    }


    // user clicks button
    public void ShowData(View view) {


    }

}






<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <EditText
        android:id="@+id/userinput_editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="76dp"
        android:ems="10"
        android:hint="Enter Anything..."
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tetxview1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="217dp"
        android:textSize="25sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Ready to code " />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="13dp"
        android:layout_marginBottom="94dp"
        android:onClick="InsertData"
        android:text="Insert"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />


    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="27dp"
        android:onClick="ReadData"
        android:text="Read"
        app:layout_constraintBaseline_toBaselineOf="@+id/button"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="ShowData"
        android:text="Show"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button3" />


</androidx.constraintlayout.widget.ConstraintLayout>




------------------------------------------------------------------------------------------------------------


All the Data operation methods like putBytes , PutStream() operate on the Background thread.


putStream() is the recommended method to use for any type of file insertion.


INSERT SIMPLE IMAGE FILE INTO STORAGE.


USING putBytes( )


<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <EditText
        android:id="@+id/userinput_editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="76dp"
        android:ems="10"
        android:hint="Enter Anything..."
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tetxview1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="217dp"
        android:textSize="25sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Ready to code " />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="13dp"
        android:layout_marginBottom="94dp"
        android:onClick="InsertData"
        android:text="Insert"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />


    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="27dp"
        android:onClick="ReadData"
        android:text="Read"
        app:layout_constraintBaseline_toBaselineOf="@+id/button"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="ShowData"
        android:text="Show"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button3" />


</androidx.constraintlayout.widget.ConstraintLayout>






package com.deepesh.firebaselearningapp;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;


public class MainActivity extends AppCompatActivity{

    private static final String TAG = "TAG";
    TextView textview1;
    EditText userinput_editText;

    // Get the reference of your Storage Location.
    StorageReference storage_ref;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // initialises all fields
        init();



    }



    private void init(){

       textview1=findViewById(R.id.tetxview1);
       userinput_editText=findViewById(R.id.userinput_editText);

       // Gets reference to the given Folder/Directory inside the Storage.
        // Creates one if not present.
        // if nothing passed , it gives reference to root folder of the storage.
       storage_ref = FirebaseStorage.getInstance().getReference("docs/");
    }


    // user clicks button
    public void InsertData(View view) {

        Bitmap bitmap = ReadImage();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        if (bitmap==null){
            Log.d(TAG, "InsertData: BITMAP IS NULL !");
            return;
        }else{
            bitmap.compress(Bitmap.CompressFormat.JPEG,100,baos);
        }
        // Disadvantage of using putBytes() is that
        // we need to pass it as Array of bytes.
       // putBytes() read the entire file byte by byte.
        // Hence it is not viable for large file uploads.
        // For large file upload we use putStream().
       UploadTask uploadTask = storage_ref.child("images/image1.jpg")
                .putBytes(baos.toByteArray());

                uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        textview1.setText("Sucess");
                    }
                });

                uploadTask.addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                   textview1.setText("Failure");
                    }
                });



    }

// will read the image
    private Bitmap ReadImage(){
        InputStream inputStream = null;

        try {
            // pass the file name you want to upload.
            inputStream= getAssets().open("image1.jpg");

            BitmapDrawable bitmapDrawable = (BitmapDrawable) Drawable.createFromStream(inputStream,null);

                return bitmapDrawable.getBitmap();

        } catch (IOException e) {
            Log.d(TAG, "ReadImage: ERROR : "+e.getMessage());
        }

        if (inputStream!=null){
           try {
               inputStream.close();
           }catch (Exception e){
               Log.d(TAG, "ReadImage: ERROR : " + e.getMessage());
           }
        }

        return null;
    }


    // user clicks button
    public void ReadData(View view) {


    }


    // user clicks button
    public void ShowData(View view) {


    }

}





------------------------------------------------------------------------------------------------------------


putStream() is the recommended method to use for any type of file insertion.


INSERT SIMPLE IMAGE FILE INTO STORAGE.


USING putStream( )


package com.deepesh.firebaselearningapp;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;


public class MainActivity extends AppCompatActivity{

    private static final String TAG = "TAG";
    TextView textview1;
    EditText userinput_editText;

    // Get the reference of your Storage Location.
    StorageReference storage_ref;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // initialises all fields
        init();
        
    }
    
    
    private void init(){

       textview1=findViewById(R.id.tetxview1);
       userinput_editText=findViewById(R.id.userinput_editText);

       // Gets reference to the given Folder/Directory inside the Storage.
        // Creates one if not present.
        // if nothing passed , it gives reference to root folder of the storage.
       storage_ref = FirebaseStorage.getInstance().getReference("docs/");
    }


    // user clicks button
    public void InsertData(View view) {

        InputStream inputstream = null;

        try {
            inputstream= new FileInputStream(new File(getFilesDir(),"image1.jpg"));
        } catch (FileNotFoundException e) {
            Log.d(TAG, "InsertData: ERROR :"+e.getMessage());
        }

        UploadTask uploadTask = storage_ref.child("images/image1.jpg").putStream(inputstream);

        uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                textview1.setText("Sucess");
            }
        });

        uploadTask.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {

                textview1.setText("Failure");
            }
        });


    }


    // user clicks button
    public void ReadData(View view) {


    }


    // user clicks button
    public void ShowData(View view) {


    }

}



(We fetch the file from inside the file directory of the device)




(UI as Above)

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <EditText
        android:id="@+id/userinput_editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="76dp"
        android:ems="10"
        android:hint="Enter Anything..."
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tetxview1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="217dp"
        android:textSize="25sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="Ready to code " />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="13dp"
        android:layout_marginBottom="94dp"
        android:onClick="InsertData"
        android:text="Insert"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />


    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="27dp"
        android:onClick="ReadData"
        android:text="Read"
        app:layout_constraintBaseline_toBaselineOf="@+id/button"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="ShowData"
        android:text="Show"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button3" />


</androidx.constraintlayout.widget.ConstraintLayout>



------------------------------------------------------------------------------------------------------------

useful video & blogs : 

https://youtu.be/RwwVim8ycyg


2 main Methods used to Read data from firebase are getBytes & getFile().

getBytes( ) first reads / loads all the bytes into ram before doing any operation , hence it takes Ram , due to this it is not used for large file insertion or fetching. 

Use getFile( ) instead.


DOWNLOAD , READ & SAVE FILES FROM FIREBASE

Using getBytes( ) 


(we fetch these existing files from firebase storage database)



Just Change the File path to download different files You can download pdf's , videos , audio etc files doing the same method.


package com.deepesh.firebaselearningapp;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;

import java.io.File;
import java.io.FileOutputStream;


public class MainActivity extends AppCompatActivity{

    private static final String TAG = "TAG";
    TextView textview1;
    ImageView imageView;

    // Get the reference of your Storage Location.
    StorageReference storage_ref;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // initialises all fields
        init();

    }



    private void init(){

       textview1=findViewById(R.id.textView1);
       imageView=findViewById(R.id.imageView1);

       storage_ref = FirebaseStorage.getInstance().getReference("docs/");
    }


    // user clicks button
    public void InsertData(View view) {

    }



    // user clicks button
    public void ReadData(View view) {
        

        // Here we know the size of our image.
        long ONE_MEGABYTE = 1024*1024;

        Task<byte[]> task = storage_ref.child("images/image1.jpg").getBytes(ONE_MEGABYTE);

        task.addOnSuccessListener(new OnSuccessListener<byte[]>() {
            @Override
            public void onSuccess(byte[] bytes) {

                imageView.setImageBitmap(BitmapFactory.decodeByteArray(bytes,0,bytes.length));
                Toast.makeText(MainActivity.this, "File Downloaded & Set", Toast.LENGTH_SHORT).show();


                // CODE TO SAVE FILE ON EXTERNAL STORAGE
                // Dont forget to add permissions inside manifest
                // Below Code to save the file may not work 
                // Write your own latest methods below

                final File outputfile = new File(Environment.getExternalStorageDirectory(),"image1.jpg");
                try {
                    FileOutputStream fos = new FileOutputStream(outputfile);
                    fos.write(bytes);
                    fos.close();
                    // Shows absolute path.
                    Log.d(TAG, "FILE SAVED AT : " + outputfile);
                }catch (Exception e){
                    Log.d(TAG, "FAILURE DUE TO : " + e.getMessage());
                }

            }
        });


        task.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {

                Log.d(TAG, "onFailure: FAILURE DUE TO : " + e.getMessage());
            }
        });

    }


}




<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="13dp"
        android:onClick="InsertData"
        android:text="Insert"
        app:layout_constraintBottom_toBottomOf="@+id/button4"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/button4" />


    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="27dp"
        android:layout_marginBottom="95dp"
        android:onClick="ReadData"
        android:text="Read"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="0dp"
        android:layout_height="287dp"
        android:layout_marginStart="46dp"
        android:layout_marginTop="92dp"
        android:layout_marginEnd="46dp"
        android:layout_marginBottom="89dp"
        app:layout_constraintBottom_toBottomOf="@+id/button3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/textView1"
        app:srcCompat="@drawable/ic_launcher_background" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="54dp"
        android:layout_marginTop="40dp"
        android:text="Ready to Code"
        android:textSize="25sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>



-----------------------------------------------------------------------------------------------------------



DOWNLOAD , READ & SAVE FILES FROM FIREBASE

Using  getFile( ) 


(UI same as Above)


package com.deepesh.firebaselearningapp;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.storage.FileDownloadTask;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import java.io.File;


public class MainActivity extends AppCompatActivity{

    private static final String TAG = "TAG";
    TextView textview1;
    ImageView imageView;

    // Get the reference of your Storage Location.
    StorageReference storage_ref;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // initialises all fields
        init();

    }



    private void init(){

       textview1=findViewById(R.id.textView1);
       imageView=findViewById(R.id.imageView1);

       storage_ref = FirebaseStorage.getInstance().getReference("docs/");
    }


    // user clicks button
    public void InsertData(View view) {

    }



    // user clicks button
    public void ReadData(View view) {

        // Create a file on external cache storage
        final File outputfile = new File(getExternalCacheDir(),"myimage1.jpg");

        // write the fetched file into external file.
        FileDownloadTask task = storage_ref.child("images/image1.jpg").getFile(outputfile);

        task.addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {

                Toast.makeText(MainActivity.this, "Filde Downloaded ", Toast.LENGTH_SHORT).show();
                Log.d(TAG, "onSuccess: File Downloaded " + outputfile);

                imageView.setImageURI(Uri.fromFile(outputfile));
            }
        });


        task.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {

                Log.d(TAG, "onFailure: DOWNLOAD FAILURE DUE TO : " + e.getMessage());
            }
        });

    }


}





<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />


<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">


<Button
    android:id="@+id/button3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="13dp"
    android:onClick="InsertData"
    android:text="Insert"
    app:layout_constraintBottom_toBottomOf="@+id/button4"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="@+id/button4" />


<Button
    android:id="@+id/button4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="27dp"
    android:layout_marginBottom="95dp"
    android:onClick="ReadData"
    android:text="Read"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent" />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="0dp"
    android:layout_height="287dp"
    android:layout_marginStart="46dp"
    android:layout_marginTop="92dp"
    android:layout_marginEnd="46dp"
    android:layout_marginBottom="89dp"
    app:layout_constraintBottom_toBottomOf="@+id/button3"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="@+id/textView1"
    app:srcCompat="@drawable/ic_launcher_background" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="54dp"
    android:layout_marginTop="40dp"
    android:text="Ready to Code"
    android:textSize="25sp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>



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GET DOWNLOAD URL FOR FILES & DOWNLOAD THE FILES DIRECTLY INTO ANDROID STORAGE.


getDownloadURL() gives a direct download url for the file stored inside the firebase storage.

You Can use the Download Manager Service to download the files using URL.


package com.deepesh.firebaselearningapp;

import android.app.DownloadManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;

import java.io.File;


public class MainActivity extends AppCompatActivity{

    private static final String TAG = "TAG";
    TextView textview1;
    ImageView imageView;

    // Get the reference of your Storage Location.
    StorageReference storage_ref;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // initialises all fields
        init();

    }



    private void init(){

       textview1=findViewById(R.id.textView1);
       imageView=findViewById(R.id.imageView1);

       storage_ref = FirebaseStorage.getInstance().getReference("docs/");
    }


    // user clicks button
    public void InsertData(View view) {


    }



    // user clicks button
    public void DownLoadData(View view) {


        Task<Uri> task = storage_ref.child("images/image1.jpg").getDownloadUrl();

        task.addOnSuccessListener(new OnSuccessListener<Uri>() {
            @Override
            public void onSuccess(Uri uri) {

                // use toString() on Uri to convert it into URL
                Log.d(TAG, "onSuccess: URL IS : " + uri.toString());


                DownloadFile(uri);

            }
        });

        task.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {

                Toast.makeText(MainActivity.this, "Some Error !", Toast.LENGTH_SHORT).show();
                Log.d(TAG, "onFailure: Error - " + e.getMessage());

            }
        });

    }

    private void DownloadFile(Uri uri) {
        File file  = new File(getExternalCacheDir(),"myfirebaseimage.jpg");

        // DOWNLOADING CODE

        DownloadManager manager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        // Starts downloading with a notification.
        DownloadManager.Request request = new DownloadManager.Request(uri)
                .setTitle("File from firebase")
                .setDescription("This is file from firebase")
                .setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE)
                // this saves the downloaded data into the given file.
                .setDestinationUri(Uri.fromFile(file));
        //adds to download queue.
        manager.enqueue(request);

    }


}





(UI SAME AS ABOVE )

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">


<Button
    android:id="@+id/button3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="13dp"
    android:onClick="InsertData"
    android:text="Insert"
    app:layout_constraintBottom_toBottomOf="@+id/button4"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="@+id/button4" />


<Button
    android:id="@+id/button4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="27dp"
    android:layout_marginBottom="95dp"
    android:onClick="DownLoadData"
    android:text="Read"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent" />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="0dp"
    android:layout_height="287dp"
    android:layout_marginStart="46dp"
    android:layout_marginTop="92dp"
    android:layout_marginEnd="46dp"
    android:layout_marginBottom="89dp"
    app:layout_constraintBottom_toBottomOf="@+id/button3"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="@+id/textView1"
    app:srcCompat="@drawable/ic_launcher_background" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="54dp"
    android:layout_marginTop="40dp"
    android:text="Ready to Code"
    android:textSize="25sp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>




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