Android Open Source - Visu File Selector

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License

The source code is released under:
Apache License
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Java Source Code

package com.samsung.sprc.fileselector;
/* w  ww .j a  v a 2s.c om*/
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;

import com.ufavaloro.android.visu.R;
import com.ufavaloro.android.visu.UI.MainActivity;

//import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
//import android.content.DialogInterface;
import android.os.Environment;
//import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Create the file selection dialog. This class will create a custom dialog for
 * file selection which can be used to save files.
 */
public class FileSelector {

  /** The list of files and folders which you can choose from */
  private ListView mFileListView;

  /** Button to save/load file */
  private Button mSaveLoadButton;
  /** Cancel Button - close dialog */
  private Button mCancelButton;
  /** Button to create a new folder */
  //private Button mNewFolderButton;

  /** Spinner by which to select the file type filtering */
  private Spinner mFilterSpinner;

  /**
   * Indicates current location in the directory structure displayed in the
   * dialog.
   */
  private File mCurrentLocation;

  /**
   * The file selector dialog.
   */
  private final Dialog mDialog;

  private Context mContext;

  /** Save or Load file listener. */
  final OnHandleFileListener mOnHandleFileListener;

  /**
   * Constructor that creates the file selector dialog.
   * 
   * @param context
   *            The current context.
   * @param operation
   *            LOAD - to load file / SAVE - to save file
   * @param onHandleFileListener
   *            Notified after pressing the save or load button.
   * @param fileFilters
   *            Array with filters
   */
  public FileSelector(final Context context, final FileOperation operation,
      final OnHandleFileListener onHandleFileListener, final String[] fileFilters) {
    mContext = context;
    mOnHandleFileListener = onHandleFileListener;

    //final File sdCard = Environment.getExternalStorageDirectory();
    File studiesFolder = MainActivity.getStudiesFolder();
        
    if (studiesFolder.canRead()) {
      mCurrentLocation = studiesFolder;
    } else {
      mCurrentLocation = Environment.getRootDirectory();
    }

    mDialog = new Dialog(context, android.R.style.Theme_DeviceDefault_Light_Dialog_NoActionBar_MinWidth);
    mDialog.setContentView(R.layout.dialog_file_selector);
    //mDialog.setTitle(mCurrentLocation.getAbsolutePath());

    prepareFilterSpinner(fileFilters);
    prepareFilesList();

    setSaveLoadButton(operation);
    setNewFolderButton(operation);
    setCancelButton();
  }

  /**
   * This method prepares a filter's list with the String's array
   * 
   * @param aFilesFilter
   *            - array of filters, the elements of the array will be used as
   *            elements of the spinner
   */
  private void prepareFilterSpinner(String[] fitlesFilter) {
    mFilterSpinner = (Spinner) mDialog.findViewById(R.id.fileFilter);
    if (fitlesFilter == null || fitlesFilter.length == 0) {
      fitlesFilter = new String[] { FileUtils.FILTER_ALLOW_ALL };
      mFilterSpinner.setEnabled(false);
    }
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(mContext, R.layout.file_selector_spinner_item, fitlesFilter);

    mFilterSpinner.setAdapter(adapter);
    OnItemSelectedListener onItemSelectedListener = new OnItemSelectedListener() {

      @Override
      public void onItemSelected(AdapterView<?> aAdapter, View aView, int arg2, long arg3) {
        TextView textViewItem = (TextView) aView;
        String filtr = textViewItem.getText().toString();
        makeList(mCurrentLocation, filtr);
      }

      @Override
      public void onNothingSelected(AdapterView<?> arg0) {

      }
    };
    mFilterSpinner.setOnItemSelectedListener(onItemSelectedListener);
  }

  /**
   * This method prepares the mFileListView
   * 
   */
  private void prepareFilesList() {
    mFileListView = (ListView) mDialog.findViewById(R.id.fileList);

    mFileListView.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(final AdapterView<?> parent, final View view, final int position, final long id) {
        // Check if "../" item should be added.
        ((EditText) mDialog.findViewById(R.id.fileName)).setText("");
        if (id == 0) {
          final String parentLocation = mCurrentLocation.getParent();
          if (parentLocation != null) { // text == "../"
            String fileFilter = ((TextView) mFilterSpinner.getSelectedView()).getText().toString();
            mCurrentLocation = new File(parentLocation);
            makeList(mCurrentLocation, fileFilter);
          } else {
            onItemSelect(parent, position);
          }
        } else {
          onItemSelect(parent, position);
        }
      }
    });
    String filtr = mFilterSpinner.getSelectedItem().toString();
    makeList(mCurrentLocation, filtr);
  }

  /**
   * The method that fills the list with a directories contents.
   * 
   * @param location
   *            Indicates the directory whose contents should be displayed in
   *            the dialog.
   * @param fitlesFilter
   *            The filter specifies the type of file to be displayed
   */
  private void makeList(final File location, final String fitlesFilter) {
    final ArrayList<FileData> fileList = new ArrayList<FileData>();
    final String parentLocation = location.getParent();
    if (parentLocation != null) {
      // First item on the list.
      fileList.add(new FileData("../", FileData.UP_FOLDER));
    }
    File listFiles[] = location.listFiles();
    if (listFiles != null) {
      ArrayList<FileData> fileDataList = new ArrayList<FileData>();
      for (int index = 0; index < listFiles.length; index++) {
        File tempFile = listFiles[index];
        if (FileUtils.accept(tempFile, fitlesFilter)) {
          int type = tempFile.isDirectory() ? FileData.DIRECTORY : FileData.FILE;
          fileDataList.add(new FileData(listFiles[index].getName(), type));
        }
      }
      fileList.addAll(fileDataList);
      Collections.sort(fileList);
    }
    // Fill the list with the contents of fileList.
    if (mFileListView != null) {
      FileListAdapter adapter = new FileListAdapter(mContext, fileList);
      mFileListView.setAdapter(adapter);
    }
  }

  /**
   * Handle the file list item selection.
   * 
   * Change the directory on the list or change the name of the saved file if
   * the user selected a file.
   * 
   * @param parent
   *            First parameter of the onItemClick() method of
   *            OnItemClickListener. It's a value of text property of the
   *            item.
   * @param position
   *            Third parameter of the onItemClick() method of
   *            OnItemClickListener. It's the index on the list of the
   *            selected item.
   */
  private void onItemSelect(final AdapterView<?> parent, final int position) {
    final String itemText = ((FileData) parent.getItemAtPosition(position)).getFileName();
    final String itemPath = mCurrentLocation.getAbsolutePath() + File.separator + itemText;
    final File itemLocation = new File(itemPath);

    if (!itemLocation.canRead()) {
      Toast.makeText(mContext, "Access denied!!!", Toast.LENGTH_SHORT).show();
    } else if (itemLocation.isDirectory()) {
      mCurrentLocation = itemLocation;
      String fileFilter = ((TextView) mFilterSpinner.getSelectedView()).getText().toString();
      makeList(mCurrentLocation, fileFilter);
    } else if (itemLocation.isFile()) {
      final EditText fileName = (EditText) mDialog.findViewById(R.id.fileName);
      fileName.setText(itemText);
    }
  }

  /**
   * Set button name and click handler for Save or Load button.
   * 
   * @param operation
   *            Performed file operation.
   */
  private void setSaveLoadButton(final FileOperation operation) {
    mSaveLoadButton = (Button) mDialog.findViewById(R.id.fileSaveLoad);
    switch (operation) {
    case SAVE:
      mSaveLoadButton.setText(R.string.saveButtonText);
      break;
    case LOAD:
      mSaveLoadButton.setText(R.string.loadButtonText);
      break;
    }
    mSaveLoadButton.setOnClickListener(new SaveLoadClickListener(operation, this, mContext));
  }

  /**
   * Set button visibility and click handler for New folder button.
   * 
   * @param operation
   *            Performed file operation.
   */
  private void setNewFolderButton(final FileOperation operation) {
    /*
    mNewFolderButton = (Button) mDialog.findViewById(R.id.newFolder);
    OnClickListener newFolderListener = new OnClickListener() {
      @Override
      public void onClick(final View v) {
        openNewFolderDialog();
      }
    };
    switch (operation) {
    case SAVE:
      break;
    case LOAD:
      break;
    }
    */
  }

  /** Opens a dialog for creating a new folder. */
  /*
  private void openNewFolderDialog() {
    AlertDialog.Builder alert = new AlertDialog.Builder(mContext);
    alert.setTitle(R.string.newFolderButtonText);
    alert.setMessage(R.string.newFolderDialogMessage);
    final EditText input = new EditText(mContext);
    alert.setView(input);
    alert.setPositiveButton(R.string.createButtonText, new DialogInterface.OnClickListener() {
      @Override
      public void onClick(final DialogInterface dialog, final int whichButton) {
        File file = new File(mCurrentLocation.getAbsolutePath() + File.separator + input.getText().toString());
        if (file.mkdir()) {
          Toast t = Toast.makeText(mContext, R.string.folderCreationOk, Toast.LENGTH_SHORT);
          t.setGravity(Gravity.CENTER, 0, 0);
          t.show();
        } else {
          Toast t = Toast.makeText(mContext, R.string.folderCreationError, Toast.LENGTH_SHORT);
          t.setGravity(Gravity.CENTER, 0, 0);
          t.show();
        }
        String fileFilter = ((TextView) mFilterSpinner.getSelectedView()).getText().toString();
        makeList(mCurrentLocation, fileFilter);
      }
    });
    alert.show();
  }
  */
  
  /** Set onClick() event handler for the cancel button. */
  private void setCancelButton() {
    mCancelButton = (Button) mDialog.findViewById(R.id.fileCancel);
    mCancelButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(final View view) {
        mDialog.cancel();
      }
    });
  }

  public String getSelectedFileName() {
    final EditText fileName = (EditText) mDialog.findViewById(R.id.fileName);
    return fileName.getText().toString();
  }

  public File getCurrentLocation() {
    return mCurrentLocation;
  }

  /** Simple wrapper around the Dialog.show() method. */
  public void show() {
    mDialog.show();
  }

  /** Simple wrapper around the Dialog.dissmiss() method. */
  public void dismiss() {
    mDialog.dismiss();
  }
}
Java Source Code List
