add mapsforge activity to example
This commit is contained in:
Hannes Janetzek
250
vtm-android-example/src/org/oscim/android/filepicker/FilePicker.java
Executable file
250
vtm-android-example/src/org/oscim/android/filepicker/FilePicker.java
Executable file
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/*
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* Copyright 2010, 2011, 2012 mapsforge.org
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*
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* This program is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.oscim.android.filepicker;
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import java.io.File;
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import java.io.FileFilter;
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import java.util.Arrays;
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import java.util.Comparator;
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import org.oscim.android.test.R;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.app.Dialog;
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import android.content.Intent;
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import android.content.SharedPreferences;
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import android.content.SharedPreferences.Editor;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.AdapterView;
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import android.widget.GridView;
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/**
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* A FilePicker displays the contents of directories. The user can navigate
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* within the file system and select a single
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* file whose path is then returned to the calling activity. The ordering of
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* directory contents can be specified via
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* {@link #setFileComparator(Comparator)}. By default subfolders and files are
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* grouped and each group is ordered
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* alphabetically.
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* <p>
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* A {@link FileFilter} can be activated via
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* {@link #setFileDisplayFilter(FileFilter)} to restrict the displayed files and
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* folders. By default all files and folders are visible.
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* <p>
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* Another <code>FileFilter</code> can be applied via
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* {@link #setFileSelectFilter(ValidFileFilter)} to check if a selected file is
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* valid before its path is returned. By default all files are considered as
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* valid and can be selected.
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*/
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public class FilePicker extends Activity implements AdapterView.OnItemClickListener {
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/**
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* The name of the extra data in the result {@link Intent}.
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*/
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public static final String SELECTED_FILE = "selectedFile";
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private static final String PREFERENCES_FILE = "FilePicker";
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private static final String CURRENT_DIRECTORY = "currentDirectory";
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private static final String DEFAULT_DIRECTORY = "/";
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private static final int DIALOG_FILE_INVALID = 0;
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// private static final int DIALOG_FILE_SELECT = 1;
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protected Comparator<File> mFileComparator = getDefaultFileComparator();
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protected FileFilter mFileDisplayFilter;
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protected ValidFileFilter mFileSelectFilter;
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/**
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* Sets the file comparator which is used to order the contents of all
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* directories before displaying them. If set to
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* null, subfolders and files will not be ordered.
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*
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* @param fileComparator
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* the file comparator (may be null).
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*/
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public void setFileComparator(Comparator<File> fileComparator) {
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mFileComparator = fileComparator;
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}
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/**
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* Sets the file display filter. This filter is used to determine which
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* files and subfolders of directories will be
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* displayed. If set to null, all files and subfolders are shown.
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*
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* @param fileDisplayFilter
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* the file display filter (may be null).
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*/
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public void setFileDisplayFilter(FileFilter fileDisplayFilter) {
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mFileDisplayFilter = fileDisplayFilter;
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}
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/**
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* Sets the file select filter. This filter is used when the user selects a
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* file to determine if it is valid. If set
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* to null, all files are considered as valid.
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*
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* @param fileSelectFilter
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* the file selection filter (may be null).
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*/
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public void setFileSelectFilter(ValidFileFilter fileSelectFilter) {
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mFileSelectFilter = fileSelectFilter;
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}
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/**
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* Creates the default file comparator.
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*
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* @return the default file comparator.
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*/
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private static Comparator<File> getDefaultFileComparator() {
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// order all files by type and alphabetically by name
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return new Comparator<File>() {
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@Override
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public int compare(File file1, File file2) {
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if (file1.isDirectory() && !file2.isDirectory()) {
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return -1;
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} else if (!file1.isDirectory() && file2.isDirectory()) {
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return 1;
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} else {
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return file1.getName().compareToIgnoreCase(file2.getName());
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}
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}
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};
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}
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private File mDirectory;
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private FilePickerIconAdapter mFilePickerIconAdapter;
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private File[] mFiles;
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private File[] mFilesWithParentFolder;
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@SuppressWarnings("deprecation")
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@Override
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public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
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File selectedFile = mFiles[(int) id];
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if (selectedFile.isDirectory()) {
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mDirectory = selectedFile;
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browseToCurrentDirectory();
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} else if (mFileSelectFilter == null || mFileSelectFilter.accept(selectedFile)) {
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setResult(RESULT_OK,
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new Intent().putExtra(SELECTED_FILE, selectedFile.getAbsolutePath()));
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finish();
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} else {
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showDialog(DIALOG_FILE_INVALID);
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}
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}
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/**
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* Browses to the current directory.
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*/
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private void browseToCurrentDirectory() {
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setTitle(mDirectory.getAbsolutePath());
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// read the subfolders and files from the current directory
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if (mFileDisplayFilter == null) {
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mFiles = mDirectory.listFiles();
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} else {
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mFiles = mDirectory.listFiles(mFileDisplayFilter);
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}
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if (mFiles == null) {
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mFiles = new File[0];
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} else {
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// order the subfolders and files
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Arrays.sort(mFiles, mFileComparator);
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}
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// if a parent directory exists, add it at the first position
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if (mDirectory.getParentFile() != null) {
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mFilesWithParentFolder = new File[mFiles.length + 1];
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mFilesWithParentFolder[0] = mDirectory.getParentFile();
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System.arraycopy(mFiles, 0, mFilesWithParentFolder, 1,
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mFiles.length);
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mFiles = mFilesWithParentFolder;
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mFilePickerIconAdapter.setFiles(mFiles, true);
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} else {
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mFilePickerIconAdapter.setFiles(mFiles, false);
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}
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mFilePickerIconAdapter.notifyDataSetChanged();
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}
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_file_picker);
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mFilePickerIconAdapter = new FilePickerIconAdapter(this);
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GridView gridView = (GridView) findViewById(R.id.filePickerView);
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gridView.setOnItemClickListener(this);
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gridView.setAdapter(mFilePickerIconAdapter);
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// if (savedInstanceState == null) {
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// // first start of this instance
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// showDialog(DIALOG_FILE_SELECT);
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// }
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}
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@Override
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protected Dialog onCreateDialog(int id) {
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AlertDialog.Builder builder = new AlertDialog.Builder(this);
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switch (id) {
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case DIALOG_FILE_INVALID:
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builder.setIcon(android.R.drawable.ic_menu_info_details);
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builder.setTitle(R.string.error);
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StringBuilder stringBuilder = new StringBuilder();
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stringBuilder.append(getString(R.string.file_invalid));
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stringBuilder.append("\n\n");
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stringBuilder.append(mFileSelectFilter.getFileOpenResult()
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.getErrorMessage());
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builder.setMessage(stringBuilder.toString());
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builder.setPositiveButton(R.string.ok, null);
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return builder.create();
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// case DIALOG_FILE_SELECT:
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// builder.setMessage(R.string.file_select);
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// builder.setPositiveButton(R.string.ok, null);
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// return builder.create();
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default:
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// do dialog will be created
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return null;
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}
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}
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@Override
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protected void onPause() {
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super.onPause();
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// save the current directory
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Editor editor = getSharedPreferences(PREFERENCES_FILE, MODE_PRIVATE).edit();
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editor.clear();
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if (mDirectory != null) {
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editor.putString(CURRENT_DIRECTORY, mDirectory.getAbsolutePath());
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}
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editor.commit();
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}
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@Override
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protected void onResume() {
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super.onResume();
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// restore the current directory
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SharedPreferences preferences = getSharedPreferences(PREFERENCES_FILE,
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MODE_PRIVATE);
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mDirectory = new File(preferences.getString(CURRENT_DIRECTORY,
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DEFAULT_DIRECTORY));
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if (!mDirectory.exists() || !mDirectory.canRead()) {
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mDirectory = new File(DEFAULT_DIRECTORY);
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}
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browseToCurrentDirectory();
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}
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}
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