我正在Android Studio中制作一个文件管理器应用程序，一切似乎都正常，但当我在模拟器中打开应用程序时，它会关闭并说：“应用程序持续停止”。logcat给出如下错误：

Caused by: java.lang.NullPointerException
        at java.io.File.<init>(File.java:283)
        at com.roboproffa.filemanager.FileListActivity.onCreate(FileListActivity.java:33)
        at android.app.Activity.performCreate(Activity.java:8290)
        at android.app.Activity.performCreate(Activity.java:8269)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1384)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3657)

我认为错误在此代码的第32或33行：

package com.roboproffa.filemanager;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;

public class FileListActivity extends AppCompatActivity {

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

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        TextView noFiles = (TextView) findViewById(R.id.noFiles);

        String FilePath = getIntent().getStringExtra("path");

        File root;
        root = new File(FilePath);
        File[] filesAndFolders = root.listFiles();

        if (filesAndFolders == null || filesAndFolders.length == 0) {
            noFiles.setVisibility(View.VISIBLE);
            return;
        }
        noFiles.setVisibility(View.INVISIBLE);

        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(new MyAdapter(getApplicationContext(), filesAndFolders));

        if(checkPermission()) {
            //permission allowed
            Intent intent = new Intent(FileListActivity.this, FileListActivity.class);
            String path = Environment.getExternalStorageDirectory().getPath();
            intent.putExtra("path", path);
            startActivity(intent);
        }else {
            //permission not allowed
            requestPermission();
        }
    }

    //permission to access
    private boolean checkPermission() {
        int result = ContextCompat.checkSelfPermission(FileListActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if(result == PackageManager.PERMISSION_GRANTED){
            return true;
        }else{
            return false;
        }
    }

    private void requestPermission() {
        if(ActivityCompat.shouldShowRequestPermissionRationale(FileListActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)){
            Toast.makeText(FileListActivity.this, "Storage permission is required, please allow in settings", Toast.LENGTH_SHORT).show();
        }

        ActivityCompat.requestPermissions(FileListActivity.this, new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, 111);
    }
}

有人能帮忙吗，我在谷歌上搜索了一下，但我还没有找到解决办法。