How to connect to the FTP Server from your Android App?

This video shows quick steps to create your FTP client Android App. It demonstrates the example by connecting to a FTP server created on the local LAN network.

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Complete source code and other details:

GitHub: https://github.com/programmerworld1990/ftpserverconnect.git

Maven Dependency: https://mvnrepository.com/artifact/commons-net/commons-net/3.10.0

package com.programmerworld.ftpserverconnect;

import android.os.Bundle;
import android.os.StrictMode;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

import org.apache.commons.net.ftp.FTPClient;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private TextView textView;
    private EditText editTextFTPServer, editTextUserName, editTextPassword;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);

            textView = findViewById(R.id.textViewStatus);
            editTextFTPServer = findViewById(R.id.editTextFTPServer);
            editTextUserName = findViewById(R.id.editTextUserName);
            editTextPassword = findViewById(R.id.editTextPassword);

            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
            return insets;
        });
    }

    public void buttonConnectToFTP(View view){
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(editTextFTPServer.getText().toString());
            ftpClient.login(editTextUserName.getText().toString(), editTextPassword.getText().toString());
            ftpClient.changeWorkingDirectory("/usb1_1/Files/");
            textView.setText(ftpClient.printWorkingDirectory());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

<?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.INTERNET"/>

    <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.FTPServerConnect"
        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>
        </activity>
    </application>

</manifest>

plugins {
    alias(libs.plugins.androidApplication)
}

android {
    namespace = "com.programmerworld.ftpserverconnect"
    compileSdk = 34

    defaultConfig {
        applicationId = "com.programmerworld.ftpserverconnect"
        minSdk = 33
        targetSdk = 34
        versionCode = 1
        versionName = "1.0"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation(libs.appcompat)
    implementation(libs.material)
    implementation(libs.activity)
    implementation(libs.constraintlayout)
    testImplementation(libs.junit)
    androidTestImplementation(libs.ext.junit)
    androidTestImplementation(libs.espresso.core)

    // https://mvnrepository.com/artifact/commons-net/commons-net
    implementation(libs.commons.net)

}

[versions]
agp = "8.3.0"
commonsNet = "3.10.0"
junit = "4.13.2"
junitVersion = "1.1.5"
espressoCore = "3.5.1"
appcompat = "1.6.1"
material = "1.11.0"
activity = "1.8.0"
constraintlayout = "2.1.4"

[libraries]
commons-net = { module = "commons-net:commons-net", version.ref = "commonsNet" }
junit = { group = "junit", name = "junit", version.ref = "junit" }
ext-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
material = { group = "com.google.android.material", name = "material", version.ref = "material" }
activity = { group = "androidx.activity", name = "activity", version.ref = "activity" }
constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }

[plugins]
androidApplication = { id = "com.android.application", version.ref = "agp" }

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textViewStatus"
        android:layout_width="268dp"
        android:layout_height="85dp"
        android:text="Hello World!"
        android:textAlignment="center"
        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="0.594" />

    <EditText
        android:id="@+id/editTextFTPServer"
        android:layout_width="258dp"
        android:layout_height="68dp"
        android:layout_marginStart="76dp"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:hint="FTP Server Name/ IP"
        android:inputType="text"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editTextUserName"
        android:layout_width="248dp"
        android:layout_height="57dp"
        android:layout_marginStart="87dp"
        android:layout_marginTop="33dp"
        android:ems="10"
        android:hint="Enter Login UserName"
        android:inputType="text"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextFTPServer" />

    <EditText
        android:id="@+id/editTextPassword"
        android:layout_width="254dp"
        android:layout_height="77dp"
        android:layout_marginStart="76dp"
        android:layout_marginTop="12dp"
        android:ems="10"
        android:hint="Enter Password"
        android:inputType="textPassword"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextUserName" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="120dp"
        android:layout_marginTop="24dp"
        android:onClick="buttonConnectToFTP"
        android:text="Connect to FTP"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextPassword" />

</androidx.constraintlayout.widget.ConstraintLayout>

Screenshots: