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   val dirRequest =
        registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { uri: Uri? ->
            uri?.let { folderUri ->
              
                contentResolver.takePersistableUriPermission(
                    folderUri,
                    Intent.FLAG_GRANT_READ_URI_PERMISSION
                )
                
              //use picked uri android

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http://www.java2s.com/example/java-api/android/provider/documentscontract/builddocumenturiusingtree-2-0.html

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  buildFeatures {
        viewBinding true
    }


// activity and lifecycle
    implementation 'androidx.activity:activity-ktx:1.5.1'
    implementation 'androidx.fragment:fragment-ktx:1.5.2'
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1"
    implementation 'androidx.lifecycle:lifecycle-common-java8:2.5.1'

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<application
        android:resizeableActivity="false"

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private fun giveMeCenterPosition(): Int {
        val firstPos = layoutManager!!.findFirstVisibleItemPosition()
        val lastPos = layoutManager!!.findLastVisibleItemPosition()
        val middle = abs(lastPos - firstPos) / 2 + firstPos
        return middle
    }

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package moozy.com.moozy.gestures;

import android.content.Context;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

public class OnSwipeTouchListener implements OnTouchListener {

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package cc.cubone.turbo.core.app;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.View;

/**
 * Fragment for handling view after it has been created and visible to user for the first time.
 *
 * <p>Specially in {@link android.support.v4.view.ViewPager}, the page will be created beforehand