Start activity using intent of ACTION_VIEW, for specified MIME type.

In the last post, we can Get File Extension and MIME Type. According to the detected MIME Type, we can start another activity with intent of ACTION_VIEW to view the file.

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();
      
      //Start Activity to view the selected file
      Intent intent;
      intent = new Intent(Intent.ACTION_VIEW);
      intent.setDataAndType(selectedUri, mimeType);
      startActivity(intent);

     }
 }

 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); 
    }

}