package com.example.admin.s20172280_02;

import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import java.io.File;

public class MainActivity extends AppCompatActivity {

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

        Button btn;
        final EditText edt;
        btn = (Button) findViewById(R.id.btn);
        edt = (EditText) findViewById(R.id.edt);

        btn.setOnClickListener(new View.OnClickListener(){
            @Override
            public  void onClick(View v) {
                String sysDir = Environment.getRootDirectory()
                        .getAbsolutePath();
                File[] sysFiles = (new File(sysDir).listFiles());

                String strFname;
                for(int i =0 ; i <sysFiles.length; i++){
                    if(sysFiles[i].isDirectory() == true)
                        strFname = "<폴더>" + sysFiles[i].toString();
                    else
                        strFname = "<파일>" + sysFiles[i].toString();

                    edt.setText(edt.getText() + "\n" + strFname);
                }
            }
        });
    }
}