Create Directory Programmatically in Android

This example demonstrates how to create directory programmatically in Android

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?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:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Hello World!"    app:layout_constraintBottom_toBottomOf="parent"    app:layout_constraintLeft_toLeftOf="parent"    app:layout_constraintRight_toRightOf="parent"    app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>

Step 3 − Add the following code to src/MainActivity.java

package com.app.sample; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import java.io.File; import android.os.Bundle; import android.os.Environment; import android.app.Activity; import android.view.Menu; import android.widget.Toast; public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.activity_main);       File file = new File(Environment.getExternalStorageDirectory()+"/Sample Directory");       boolean success = true;       if(!file.exists()) {          Toast.makeText(getApplicationContext(),"Directory does not exist, create it",          Toast.LENGTH_LONG).show();       }       if(success) {          Toast.makeText(getApplication(),"Directory created",          Toast.LENGTH_LONG).show();       }       else {          Toast.makeText(this,"Failed to create Directory",          Toast.LENGTH_LONG).show();       }    } }

Step 4 − Add the following code to Manifests/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.app.sample">    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <application       android:allowBackup="true"       android:icon="@mipmap/ic_launcher"       android:label="@string/app_name"       android:roundIcon="@mipmap/ic_launcher_round"       android:supportsRtl="true"       android:theme="@style/AppTheme">       <activity android:name=".MainActivity">          <intent-filter>             <action android:name="android.intent.action.MAIN" />             <category android:name="android.intent.category.LAUNCHER" />          </intent-filter>       </activity>    </application> </manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from the android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −