Give this Permission in manifest:-

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

Add this code were you want permission to check:-

 if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) 
    == PackageManager.PERMISSION_GRANTED) {
    
    Log.v(TAG,"Permission is granted");
    //File write logic here
    return true;
 }



Java queries relted to “storage permission android”