Thứ Tư, 11 tháng 7, 2012

Sort directory/file in alphabetical order ignore case

0
01:54
Last exercise of "File Explorer" list file/directory without order. We can implement Comparator<? super File> to sort the directory/file in alphabetical order. We can also convert the file name to lower case before comparing, such that the array will be sorted in alphabetical order ignore case.

Sort directory/file in alphabetical order ignore case


Modify MainActivity.java from last exercise "File Explorer".
package com.example.androidexplorer;

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

import android.os.Bundle;
import android.os.Environment;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends ListActivity {

private List<String> item = null;
private List<String> path = null;
private String root;
private TextView myPath;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myPath = (TextView)findViewById(R.id.path);

root = Environment.getExternalStorageDirectory().getPath();

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());
}

Arrays.sort(files, filecomparator);

for(int i=0; i < files.length; i++)
{
File file = files[i];

if(!file.isHidden() && file.canRead()){
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);
}

Comparator<? super File> filecomparator = new Comparator<File>(){

public int compare(File file1, File file2) {

if(file1.isDirectory()){
if (file2.isDirectory()){
return String.valueOf(file1.getName().toLowerCase()).compareTo(file2.getName().toLowerCase());
}else{
return -1;
}
}else {
if (file2.isDirectory()){
return 1;
}else{
return String.valueOf(file1.getName().toLowerCase()).compareTo(file2.getName().toLowerCase());
}
}

}
};

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
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.ic_launcher)
.setTitle("[" + file.getName() + "] folder can't be read!")
.setPositiveButton("OK", null).show();
}
}else {
new AlertDialog.Builder(this)
.setIcon(R.drawable.ic_launcher)
.setTitle("[" + file.getName() + "]")
.setPositiveButton("OK", null).show();

}
}

}


Download the files.

Next:
- Sort directory/file in order of lastModified time


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