writing a file in android device(external storage)

Read_Write.java

package com.example.read_write;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Environment;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.util.Log;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    EditText text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text = findViewById(R.id.myText);

    }
    public boolean isExternalStorageWritable(){
        if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())){
            Log.i("State","Yes it is writable");
            return true;
        }else{
            Log.i("State","No it is not writable");
            return false;
        }
    }


    public void writeFile(View view) {
        String fileName = "myFile.txt";
        if(isExternalStorageWritable() && checkPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)){
            //File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
            //File file = new File(path, "/" + fileName);

           File myFile = new File(Environment.getExternalStorageDirectory(),fileName);
            try{
                FileOutputStream fos = new FileOutputStream(myFile);
                fos.write(text.getText().toString().getBytes());
                fos.close();
                //fos.write(myText);
                Toast.makeText(this,"File Saved",Toast.LENGTH_SHORT).show();

            }catch (IOException e) {
                e.printStackTrace();
            }
        }else {
            Toast.makeText(this,"Cannot write to external storage",Toast.LENGTH_SHORT).show();
        }
    }
    public boolean checkPermission(String permission){
        int check = ContextCompat.checkSelfPermission(this,permission);
        return(check== PackageManager.PERMISSION_GRANTED);
    }
}