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/* Portions of this code is based on code from * https://github.com/mburman/Android-File-Explore and contributions from * Sugan Krishnan (https://github.com/rgksugan) * under Apache2 license > http://www.apache.org/licenses/LICENSE-2.0 * Modifications have made to use fragment instead of activity * and added more features to the file browser. *//*from www . j a v a 2 s.c o m*/ package com.arcgis.android.samples.localdata.localrasterdata; 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.graphics.Color; import android.os.Bundle; import android.os.Environment; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.PopupMenu; import android.widget.PopupMenu.OnMenuItemClickListener; import android.widget.TextView; import android.widget.Toast; public class FileBrowserFragment extends Fragment { // Stores names of traversed directories ArrayList<String> pathDirsList = new ArrayList<String>(); private List<Item> fileList = new ArrayList<Item>(); private File path = null; private String chosenFile; ArrayAdapter<Item> adapter; private boolean mShowHiddenFilesAndDirs = true; private boolean mDirectoryShownIsEmpty = false; private String mFilterFileExtension = null; private String mRequestedStartDir = null; private OnFileAndFolderFinishListener mFinishListener; // Action constants static final int SELECT_DIRECTORY = 1; // default action static final int SELECT_FILE = 2; private int mCurrentAction = SELECT_FILE; public static FileBrowserFragment newInstance() { return new FileBrowserFragment(); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onCreate(savedInstanceState); applyInitialDirectory(); parseDirectoryPath(); loadFileList(); this.createFileListAdapter(); this.initializeFileListView(); updateCurrentDirectoryTextView(); mFinishListener = (OnFileAndFolderFinishListener) getActivity(); // Fragment wants to add menu to action bar setHasOptionsMenu(true); getActivity().invalidateOptionsMenu(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.filebrowser_layout, null); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_dir_select: returnDirectoryFinishActivity(); return true; case R.id.menu_dir_up: loadDirectoryUp(); loadFileList(); adapter.notifyDataSetChanged(); updateCurrentDirectoryTextView(); return true; default: return super.onOptionsItemSelected(item); } } @Override public void onPrepareOptionsMenu(Menu menu) { for (int i = 0; i < menu.size(); i++) { MenuItem item = menu.getItem(i); if ((item.getItemId() == R.id.menu_layer_raster) || (item.getItemId() == R.id.menu_renderer) || (item.getItemId() == R.id.menu_dir_select)) { item.setVisible(false); } else if ((item.getItemId() == R.id.menu_dir_up)) { item.setVisible(true); } } } public void setInitialDirectory(String dir) { this.mRequestedStartDir = dir; } private void applyInitialDirectory() { if (mRequestedStartDir != null && mRequestedStartDir.length() > 0) { File tempFile = new File(mRequestedStartDir); if (tempFile.isDirectory()) this.path = tempFile; } if (this.path == null) { // No or invalid directory supplied in intent if (Environment.getExternalStorageDirectory().isDirectory() && Environment.getExternalStorageDirectory().canRead()) path = Environment.getExternalStorageDirectory(); else path = new File("/"); } } private void parseDirectoryPath() { pathDirsList.clear(); String pathString = path.getAbsolutePath(); String[] parts = pathString.split("/"); int i = 0; while (i < parts.length) { pathDirsList.add(parts[i]); i++; } } private void loadDirectoryUp() { // present directory removed from list String s = pathDirsList.remove(pathDirsList.size() - 1); // path modified to exclude present directory path = new File(path.toString().substring(0, path.toString().lastIndexOf(s))); fileList.clear(); } private void updateCurrentDirectoryTextView() { int i = 0; String curDirString = ""; while (i < pathDirsList.size()) { curDirString += pathDirsList.get(i) + "/"; i++; } if (pathDirsList.size() == 0) { curDirString = "/"; } ((TextView) getView().findViewById(R.id.currentDirectoryTextView)).setText("Current directory: " + curDirString); } private void showToast(String message) { Toast.makeText(getActivity(), message, Toast.LENGTH_LONG).show(); } private void initializeFileListView() { ListView lView = (ListView) (getView().findViewById(R.id.fileListView)); lView.setBackgroundColor(Color.LTGRAY); LinearLayout.LayoutParams lParam = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); lParam.setMargins(15, 5, 15, 5); lView.setAdapter(this.adapter); lView.setOnItemClickListener(new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View view, int position, long id) { chosenFile = fileList.get(position).file; final File sel = new File(path + "/" + chosenFile); if (sel.isDirectory()) { // Directory if (sel.canRead()) { // Adds chosen directory to list pathDirsList.add(chosenFile); path = new File(sel + ""); loadFileList(); adapter.notifyDataSetChanged(); updateCurrentDirectoryTextView(); } else { showToast("Path does not exist or cannot be read"); } } else { // File picked or an empty directory message clicked if (!mDirectoryShownIsEmpty) { // show a popup menu to allow users to open a raster layer for // different purpose including basemap layer, operational layer, // elevation data source for BlendRenderer, or some combinations. PopupMenu popupMenu = new PopupMenu(getActivity(), view); popupMenu.inflate(R.menu.file_browser_popup_menu); popupMenu.setOnMenuItemClickListener(new OnMenuItemClickListener() { @Override public boolean onMenuItemClick(MenuItem item) { switch (item.getItemId()) { case R.id.menu_raster_base_layer: returnFileFinishActivity(sel.getAbsolutePath(), RasterLayerAction.BASEMAP_LAYER); break; case R.id.menu_raster_operational_layer: returnFileFinishActivity(sel.getAbsolutePath(), RasterLayerAction.OPERATIONAL_LAYER); break; case R.id.menu_raster_elevation_source: returnFileFinishActivity(sel.getAbsolutePath(), RasterLayerAction.ELEVATION_SOURCE); break; case R.id.menu_raster_base_elevation: returnFileFinishActivity(sel.getAbsolutePath(), RasterLayerAction.BASEMAP_LAYER_AND_ELEVATION_SOURCE); break; case R.id.menu_raster_operational_elevation: returnFileFinishActivity(sel.getAbsolutePath(), RasterLayerAction.OPERATIONAL_LAYER_AND_ELEVATION_SOURCE); break; } return true; } }); popupMenu.show(); } } } }); } private void returnDirectoryFinishActivity() { mFinishListener.onDirectoryFinish(path.getAbsolutePath()); } private void returnFileFinishActivity(String filePath, RasterLayerAction action) { mFinishListener.onFileFinish(filePath, action); } private void loadFileList() { fileList.clear(); if (path.exists() && path.canRead()) { FilenameFilter filter = new FilenameFilter() { @Override public boolean accept(File dir, String filename) { File sel = new File(dir, filename); boolean showReadableFile = mShowHiddenFilesAndDirs || sel.canRead(); // Filters based on whether the file is hidden or not if (mCurrentAction == SELECT_DIRECTORY) { return (sel.isDirectory() && showReadableFile); } if (mCurrentAction == SELECT_FILE) { // If it is a file check the extension if provided if (sel.isFile() && mFilterFileExtension != null) { return (showReadableFile && sel.getName().endsWith(mFilterFileExtension)); } return (showReadableFile); } return true; } }; String[] fList = path.list(filter); this.mDirectoryShownIsEmpty = false; for (int i = 0; i < fList.length; i++) { // Convert into file path File sel = new File(path, fList[i]); int drawableID = R.drawable.file_icon; boolean canRead = sel.canRead(); // Set drawables if (sel.isDirectory()) { if (canRead) { drawableID = R.drawable.folder_icon; } else { drawableID = R.drawable.folder_icon_light; } } fileList.add(i, new Item(fList[i], drawableID)); } if (fileList.size() == 0) { this.mDirectoryShownIsEmpty = true; fileList.add(0, new Item("Directory is empty", -1)); } else { Collections.sort(fileList, new ItemFileNameComparator()); } } else { Toast.makeText(getActivity(), "path does not exist or cannot be read", Toast.LENGTH_SHORT).show(); } } private void createFileListAdapter() { adapter = new ArrayAdapter<Item>(getActivity(), android.R.layout.select_dialog_item, android.R.id.text1, fileList) { @Override public View getView(int position, View convertView, ViewGroup parent) { // creates view View view = super.getView(position, convertView, parent); TextView textView = (TextView) view.findViewById(android.R.id.text1); // put the image on the text view int drawableID = 0; if (fileList.get(position).icon != -1) { // If icon == -1, then directory is empty drawableID = fileList.get(position).icon; } textView.setCompoundDrawablesWithIntrinsicBounds(drawableID, 0, 0, 0); textView.setEllipsize(null); int dp3 = (int) (3 * getResources().getDisplayMetrics().density + 0.5f); textView.setCompoundDrawablePadding(dp3); textView.setBackgroundColor(Color.LTGRAY); return view; } }; } private class Item { public String file; public int icon; public Item(String file, Integer icon) { this.file = file; this.icon = icon; } @Override public String toString() { return file; } } private class ItemFileNameComparator implements Comparator<Item> { public int compare(Item lhs, Item rhs) { return lhs.file.toLowerCase().compareTo(rhs.file.toLowerCase()); } } // Listener to handle finish events public interface OnFileAndFolderFinishListener { public void onFileFinish(String path, RasterLayerAction action); public void onDirectoryFinish(String path); } enum RasterLayerAction { BASEMAP_LAYER, OPERATIONAL_LAYER, ELEVATION_SOURCE, BASEMAP_LAYER_AND_ELEVATION_SOURCE, OPERATIONAL_LAYER_AND_ELEVATION_SOURCE, NONE; } }