Implement a simple File Explorer in Android

It's a simple File Explorer in Android.



The files information can be read using java.io.File, using the code:
File f = new File(dirPath);
File[] files = f.listFiles();

The name of the files/folders will be added in a ArrayList. If it's not the root, two more elements (the root and the parent) will be added in the front of the ArrayList.

Then, the ArrayList will be adapted to a ArrayAdapter, and also set to be displayed on screen.

In case any item is clicked; if it's a file, the name will be display in a dialog; if it's a directory (isDirectory) and can be read (canRead), will open the selected directory; if it's a directory and CANNOT be read, a message will be prompt.




Create a layout file /res/layout/row.xml, which is the layout of each row the the list.

<?xml version="1.0" encoding="utf-8"?>

<TextView 

  xmlns:android="http://schemas.android.com/apk/res/android"

  android:id="@+id/rowtext"

  android:layout_width="fill_parent"

     android:layout_height="25px"

     android:textSize="23sp" />

Modify /res/layout/main.xml to have a List:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    >

<TextView

 android:id="@+id/path"

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    />

<ListView

 android:id="@android:id/list"

 android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

 />

<TextView

 android:id="@android:id/empty"

 android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="No Data"

 />

</LinearLayout>

remark: TextView with id empty will be display IF the list is empty.

Modify the code, AndroidExplorer.java

package com.AndroidExplorer;



import java.io.File;

import java.util.ArrayList;

import java.util.List;

import android.app.AlertDialog;

import android.app.ListActivity;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.View;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.TextView;



public class AndroidExplorer extends ListActivity {

 

 private List<String> item = null;

 private List<String> path = null;

 private String root="/";

 private TextView myPath;

 

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        myPath = (TextView)findViewById(R.id.path);

        getDir(root);

    }

    

    private void getDir(String dirPath)

    {

     myPath.setText("Location: " + dirPath);

     

     item = new ArrayList<String>();

     path = new ArrayList<String>();

     

     File f = new File(dirPath);

     File[] files = f.listFiles();

     

     if(!dirPath.equals(root))

     {



      item.add(root);

      path.add(root);

      

      item.add("../");

      path.add(f.getParent());

            

     }

     

     for(int i=0; i < files.length; i++)

     {

       File file = files[i];

       path.add(file.getPath());

       if(file.isDirectory())

        item.add(file.getName() + "/");

       else

        item.add(file.getName());

     }



     ArrayAdapter<String> fileList =

      new ArrayAdapter<String>(this, R.layout.row, item);

     setListAdapter(fileList);

    }



 @Override

 protected void onListItemClick(ListView l, View v, int position, long id) {

  

  File file = new File(path.get(position));

  

  if (file.isDirectory())

  {

   if(file.canRead())

    getDir(path.get(position));

   else

   {

    new AlertDialog.Builder(this)

    .setIcon(R.drawable.icon)

    .setTitle("[" + file.getName() + "] folder can't be read!")

    .setPositiveButton("OK", 

      new DialogInterface.OnClickListener() {

       

       @Override

       public void onClick(DialogInterface dialog, int which) {

        // TODO Auto-generated method stub

       }

      }).show();

   }

  }

  else

  {

   new AlertDialog.Builder(this)

    .setIcon(R.drawable.icon)

    .setTitle("[" + file.getName() + "]")

    .setPositiveButton("OK", 

      new DialogInterface.OnClickListener() {

       

       @Override

       public void onClick(DialogInterface dialog, int which) {

        // TODO Auto-generated method stub

       }

      }).show();

  }

 }

}

- Updated: Example of File Explorer in Android.