How to copy files from one path to another (Download folder to App Data folder) from your Android App? – Android 12 API 32

This video shows the steps to read the content of file from one location and copy it to another location from your Android App.

It reads an image file from Download folder and then writes to app data folder. It uses inputstream.read to read the file content and outputstream.write to copy the data to the new file.

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Complete source code and other details:

package com.programmerworld.copyfilesapp;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.storage.StorageManager;
import android.os.storage.StorageVolume;
import android.view.View;
import android.widget.TextView;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private TextView textView;

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

        ActivityCompat.requestPermissions(this, new String[]{
                Manifest.permission.WRITE_EXTERNAL_STORAGE,
                Manifest.permission.READ_EXTERNAL_STORAGE},
                PackageManager.PERMISSION_GRANTED);

        textView = findViewById(R.id.textView);
    }

    public void buttonCopyFiles(View view){
        StorageManager storageManager = (StorageManager) getSystemService(STORAGE_SERVICE);
        List<StorageVolume> storageVolumeList = storageManager.getStorageVolumes();
        StorageVolume storageVolume = storageVolumeList.get(0);
        File fileSource =new File(storageVolume.getDirectory().getPath()+"/Download/Image.jpeg");
        File fileDestination = new File(getExternalFilesDir(null), "Image_Destination1.jpeg");
        try {
            InputStream inputStream = new FileInputStream(fileSource);
            OutputStream outputStream = new FileOutputStream(fileDestination);
            byte[] byteArrayBuffer = new byte[1024];
            int intLength;
            while ((intLength = inputStream.read(byteArrayBuffer)) > 0){
                outputStream.write(byteArrayBuffer, 0, intLength);
            }
            inputStream.close();
            outputStream.close();

            textView.setText("SUCCESS");
        }catch (Exception e){
            textView.setText("ERROR: " + e.toString());
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

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


    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.CopyFilesApp"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
    </application>

</manifest>

<?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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="141dp"
        android:layout_height="117dp"
        android:text="Hello World!"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.42" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="132dp"
        android:layout_marginTop="80dp"
        android:onClick="buttonCopyFiles"
        android:text="Copy Files"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>