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The source code is released under:
Apache License
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/* * Copyright 2011 Anders Kalr//from ww w . ja v a2 s.co m * * 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 com.derlethtully.timeflash; import java.io.File; import java.io.FilenameFilter; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import android.app.ListActivity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; public class FilePickerActivity extends ListActivity { /** * The file path */ public final static String EXTRA_FILE_PATH = "file_path"; /** * Sets whether hidden files should be visible in the list or not */ public final static String EXTRA_SHOW_HIDDEN_FILES = "show_hidden_files"; /** * The allowed file extensions in an ArrayList of Strings */ public final static String EXTRA_ACCEPTED_FILE_EXTENSIONS = "accepted_file_extensions"; /** * The initial directory which will be used if no directory has been sent with the intent */ private final static String DEFAULT_INITIAL_DIRECTORY = "/"; protected File mDirectory; protected ArrayList<File> mFiles; protected FilePickerListAdapter mAdapter; protected boolean mShowHiddenFiles = false; protected String[] acceptedFileExtensions; int buttonId; TextView filePath; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Set the view to be shown if the list is empty LayoutInflater inflator = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); View emptyView = inflator.inflate(R.layout.file_picker_empty_view, null); ((ViewGroup)getListView().getParent()).addView(emptyView); getListView().setEmptyView(emptyView); filePath = (TextView) findViewById(R.id.path); //Get the button id to properly update the text view in the main activity Intent intent = getIntent(); buttonId = intent.getIntExtra("ButtonId", 0); // Set initial directory mDirectory = new File(DEFAULT_INITIAL_DIRECTORY); // Initialize the ArrayList mFiles = new ArrayList<File>(); // Set the ListAdapter mAdapter = new FilePickerListAdapter(this, mFiles); setListAdapter(mAdapter); // Initialize the extensions array to allow any file extensions acceptedFileExtensions = new String[] {}; // Get intent extras if(getIntent().hasExtra(EXTRA_FILE_PATH)) { mDirectory = new File(getIntent().getStringExtra(EXTRA_FILE_PATH)); } if(getIntent().hasExtra(EXTRA_SHOW_HIDDEN_FILES)) { mShowHiddenFiles = getIntent().getBooleanExtra(EXTRA_SHOW_HIDDEN_FILES, false); } if(getIntent().hasExtra(EXTRA_ACCEPTED_FILE_EXTENSIONS)) { ArrayList<String> collection = getIntent().getStringArrayListExtra(EXTRA_ACCEPTED_FILE_EXTENSIONS); acceptedFileExtensions = (String[]) collection.toArray(new String[collection.size()]); } } @Override protected void onResume() { refreshFilesList(); super.onResume(); } /** * Updates the list view to the current directory */ protected void refreshFilesList() { // Clear the files ArrayList mFiles.clear(); filePath.setText(mDirectory.toString()); // Set the extension file filter ExtensionFilenameFilter filter = new ExtensionFilenameFilter(acceptedFileExtensions); // Get the files in the directory File[] files = mDirectory.listFiles(filter); if(files != null && files.length > 0) { for(File f : files) { if(f.isHidden() && !mShowHiddenFiles) { // Don't add the file continue; } // Add the file the ArrayAdapter mFiles.add(f); } Collections.sort(mFiles, new FileComparator()); } mAdapter.notifyDataSetChanged(); } @Override public void onBackPressed() { if(mDirectory.getParentFile() != null) { // Go to parent directory mDirectory = mDirectory.getParentFile(); refreshFilesList(); return; } super.onBackPressed(); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { File newFile = (File)l.getItemAtPosition(position); if(newFile.isFile()) { // Set result Intent extra = new Intent(); extra.putExtra(EXTRA_FILE_PATH, newFile.getAbsolutePath()); extra.putExtra("ButtonId", buttonId); setResult(RESULT_OK, extra); // Finish the activity finish(); } else { mDirectory = newFile; // Update the files list refreshFilesList(); } super.onListItemClick(l, v, position, id); } private class FilePickerListAdapter extends ArrayAdapter<File> { private List<File> mObjects; public FilePickerListAdapter(Context context, List<File> objects) { super(context, R.layout.file_picker_list_item, android.R.id.text1, objects); mObjects = objects; } @Override public View getView(int position, View convertView, ViewGroup parent) { View row = null; if(convertView == null) { LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); row = inflater.inflate(R.layout.file_picker_list_item, parent, false); } else { row = convertView; } File object = mObjects.get(position); ImageView imageView = (ImageView)row.findViewById(R.id.file_picker_image); TextView textView = (TextView)row.findViewById(R.id.file_picker_text); // Set single line textView.setSingleLine(true); textView.setText(object.getName()); if(object.isFile()) { // Show the file icon imageView.setImageResource(R.drawable.file); } else { // Show the folder icon imageView.setImageResource(R.drawable.folder); } return row; } } private class FileComparator implements Comparator<File> { @Override public int compare(File f1, File f2) { if(f1 == f2) { return 0; } if(f1.isDirectory() && f2.isFile()) { // Show directories above files return -1; } if(f1.isFile() && f2.isDirectory()) { // Show files below directories return 1; } // Sort the directories alphabetically return f1.getName().compareToIgnoreCase(f2.getName()); } } private class ExtensionFilenameFilter implements FilenameFilter { private String[] mExtensions; public ExtensionFilenameFilter(String[] extensions) { super(); mExtensions = extensions; } @Override public boolean accept(File dir, String filename) { if(new File(dir, filename).isDirectory()) { // Accept all directory names return true; } if(mExtensions != null && mExtensions.length > 0) { for(int i = 0; i < mExtensions.length; i++) { if(filename.endsWith(mExtensions[i])) { // The filename ends with the extension return true; } } // The filename did not match any of the extensions return false; } // No extensions has been set. Accept all file extensions. return true; } } }