Get all file's path from device

Get all file's path

	package com.mihir.practice.extra;
	import android.app.Activity;
	import android.os.Bundle;
	import android.util.Log;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.widget.Button;
	import com.mihir.practice.R;
	import java.io.File;
	import java.util.ArrayList;
	public class Main extends Activity implements OnClickListener {
	private Button btn_get = null;
	private ArrayList<String> mArrMainDir = null, mArrAllFileFolderPath = null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
	btn_get = (Button) findViewById(R.id.btn_get);
	// Comment below 1 line when- to get all directory including system directories
	mArrMainDir = new ArrayList<String>();
	mArrAllFileFolderPath = new ArrayList<String>();
	btn_get.setOnClickListener(this);
	}
	@Override
	public void onClick(View v) {
	switch (v.getId()) {
	case R.id.btn_get:
	getStorageDirectory();
	Log.d("List", "List = " + mArrMainDir.toString());
	for (int i = 0; i < mArrMainDir.size(); i++) {
	listFilesAndFilesSubDirectories(mArrMainDir.get(i));
	}
	break;
	}
	}
	private void getStorageDirectory() {
	// Primary physical SD-CARD (not emulated)
	final String externalStorage = System.getenv("EXTERNAL_STORAGE");//internal
	// All Secondary SD-CARDs (all exclude primary) separated by ":"
	String secondaryStorages = System.getenv("SECONDARY_STORAGE");//physical SD card
	if (secondaryStorages != null) {
	if (secondaryStorages.contains(":")) {
	secondaryStorages = secondaryStorages.substring(0, secondaryStorages.indexOf(":")).toString();
	mArrMainDir.add(secondaryStorages);
	// to get all directory including system directories
	/*
	String[] values = secondaryStorages.split(":");
	mArrMainDir = new ArrayList<String>(values.length);
	for (String s : values)
	{
	mArrMainDir.add(s);
	}
	*/
	}
	}
	mArrMainDir.add(externalStorage);
	}
	/**
	* List all files from a directory and its sub directories
	*
	* @param directoryName to be listed
	*/
	public void listFilesAndFilesSubDirectories(String directoryName) {
	File directory = new File(directoryName);
	// get all the files from a directory
	File[] fList = directory.listFiles();
	for (File file : fList) {
	if (file.isFile()) {
	Log.d("FilesAndFilesSubDirectories", file.getAbsolutePath().toString());
	mArrAllFileFolderPath.add(file.getAbsolutePath().toString());
	} else if (file.isDirectory()) {
	listFilesAndFilesSubDirectories(file.getAbsolutePath());
	}
	}
	}
	}

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