Displaying Files And Directories In Android

This example shows how you can list files and directories on your storage media in your application.

Algorithm:

1.) Create a new project by File-> New -> Android Project name it FileAndDirectoryList.

2.) Write following permissions into android manifest.xml:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

3.) Run for output.

Steps:

1.) Create a project named FileAndDirectoryList and set the information as stated in the image.

Build Target: Android 4.4
Application Name: FileAndDirectoryList
Package Name: com.example. FileAndDirectoryList
Activity Name: FileAndDirectoryListActivity

2.) Open FileAndDirectoryListActivity.java file and write following code there:

package com.example.fileanddirectorylist;

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

import android.app.ListActivity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.ArrayAdapter;

public class FileAndDirectoryListActivity extends ListActivity {

private List<String> fileList = new ArrayList<String>();

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

File root = new File(Environment
.getExternalStorageDirectory()
.getAbsolutePath());
ListDir(root);

}

void ListDir(File f){
File[] files = f.listFiles();
fileList.clear();
for (File file : files){
fileList.add(file.getPath());
}

ArrayAdapter<String> directoryList
= new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, fileList);
setListAdapter(directoryList);
}
}

3.) Compile and build the project.

Output