SelectActivity - temp

package com.doan.quet;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import java.io.File;
import java.util.ArrayList;

public class SelectActivity extends AppCompatActivity {

    ArrayList<String> listView = new ArrayList<String>();
    ArrayList<String> listFile = new ArrayList<String>();
    String Path = "";
    String PathTemp = "/";
    String PathParent = "/";
    TextView txt;
    ListView lv;
    ArrayAdapter<String>adapter;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select);
        txt=(TextView) findViewById(R.id.txtselection);
        lv=(ListView) findViewById(R.id.list);

        ChangeSelect(PathTemp);

        lv.setOnItemClickListener(
                new AdapterView.OnItemClickListener() {
                    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
//                        txt.setText("position :"+arg2+" ; value ="+ listFile.get(arg2));
                        try {
                            PathTemp = Path;
                            Path = Path + "/" + listFile.get(arg2);
                            ChangeSelect(Path);
                        } catch(Exception e){}
                    }
                }
        );
    }

    void ChangeSelect(String path){
        File directory = new File(path);
        listFile = new ArrayList<String>();
        listView = new ArrayList<String>();
        File[] files = directory.listFiles();
        for (int i = 0; i < files.length; ++i) {
            listFile.add(files[i].getName());
            if (files[i].isDirectory()){
                listView.add("Folder -- " + files[i].getName());
            } else {
                listView.add("File   -- " + files[i].getName());
            }
        }
        txt.setText(path);
        adapter=new ArrayAdapter<String>
                (this, android.R.layout.simple_list_item_1, listView);
        lv.setAdapter(adapter);
    }

    public void Back(View view) {
        Log.v("mao", "mao back");
        ChangeSelect(PathTemp);
    }
}