edu.teco.context.ui.FileChooserDialogFragment.java Source code

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Here is the source code for edu.teco.context.ui.FileChooserDialogFragment.java

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/*******************************************************************************
 * Copyright 2013 Karlsruhe Institute of Technology. This Work has been partially supported by the EIT ICT Labs funded research project Towards a Mobile Cloud (activity CLD 12206).
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package edu.teco.context.ui;

import java.io.File;
import java.io.FilenameFilter;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.DialogFragment;
import android.util.Log;
import edu.teco.context.configuration.FrameworkConfiguration;
import edu.teco.context.configuration.FrameworkContext;

/**
 * 
 * @author Sven Frauen
 * 
 * for more information see:
 * http://developer.android.com/guide/topics/ui/dialogs.html
 * http://stackoverflow.com/questions/3592717/choose-file-dialog
 */
public class FileChooserDialogFragment extends DialogFragment {

    /** Tag string for debug logs. */
    private static final String TAG = "FileChooserDialogFragment";

    public interface FileChooserDialogListener {
        public void onFileSelected(String file);
    }

    // Use this instance of the interface to deliver action events
    private FileChooserDialogListener mListener;

    // for handling files
    private String[] mFileList;
    private File mPath = null;
    private String mChosenFile;
    private String mFileType = null;

    public void addListener(FileChooserDialogListener listener) {
        mListener = listener;
    }

    public void removeListener(FileChooserDialogListener listener) {
        mListener = null;
    }

    private void loadFileList() {
        try {
            mPath.mkdirs();
        } catch (SecurityException e) {
            if (FrameworkContext.ERROR)
                Log.e(TAG, "unable to write on the sd card " + e.toString());
        }
        if (mPath.exists()) {
            FilenameFilter filter = new FilenameFilter() {
                public boolean accept(File dir, String filename) {
                    File sel = new File(dir, filename);
                    return filename.contains(mFileType) || sel.isDirectory();
                }
            };
            mFileList = mPath.list(filter);
        } else {
            mFileList = new String[0];
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        String path = getArguments().getString("path");
        String fileType = getArguments().getString("fileType");

        if (path == null || fileType == null) {
            mFileType = ".arff";
            String arffDirectory = FrameworkConfiguration.getInstance().getArffDirectory();
            mPath = new File(Environment.getExternalStorageDirectory() + arffDirectory);
        } else {
            mFileType = fileType;
            mPath = new File(Environment.getExternalStorageDirectory() + path);
        }

        loadFileList();

        AlertDialog.Builder builder = new Builder(getActivity());

        builder.setTitle("Choose your file");

        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                if (FrameworkContext.INFO)
                    Log.i(TAG, "User canceled dialog.");
            }
        });

        if (mFileList == null) {
            if (FrameworkContext.ERROR)
                Log.e(TAG, "Showing file picker before loading the file list");
            return builder.create();
        }
        builder.setItems(mFileList, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                mChosenFile = mFileList[which];
                mListener.onFileSelected(mChosenFile);
            }
        });

        return builder.create();
    }

}