Get File Extension and MIME Type

We can call the methods getFileExtensionFromUrl() and getMimeTypeFromExtension() of android.webkit.MimeTypeMap class to get File Extension and MIME Type of a file.

example:

package com.AndroidListFiles;

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

import android.app.ListActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.webkit.MimeTypeMap;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class AndroidListFilesActivity 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);

   }
  
   @Override
 protected void onListItemClick(ListView l, View v, int position, long id) {
  // TODO Auto-generated method stub
    File selected = new File(fileList.get(position));
    if(selected.isDirectory()){
     ListDir(selected);
    }else {
     Uri selectedUri = Uri.fromFile(selected);
     String fileExtension
      = MimeTypeMap.getFileExtensionFromUrl(selectedUri.toString());
     String mimeType
      = MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExtension);
     
     Toast.makeText(AndroidListFilesActivity.this,
       "FileExtension: " + fileExtension + "\n" +
       "MimeType: " + mimeType,
       Toast.LENGTH_LONG).show();

    }
 }

 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); 
   }
}

Related Posts:
- List files/directory in Android
- Navigation in files/directory
- Start activity using intent of ACTION_VIEW, for specified MIME type.