Android example source code file (FileList.java)

This example Android source code file (FileList.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, app, arraylist, charsequence, file, filelist, hashmap, keyevent, layouttests, list, map, open_directory, os, run_tests, simpleadapter, string, stringbuilder, ui, util, view

The FileList.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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.android.dumprendertree;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.io.File;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.os.Bundle;
import android.os.Environment;


public abstract class FileList extends ListActivity
{
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		switch (keyCode)
		{
			case KeyEvent.KEYCODE_DPAD_LEFT:
				if (mPath.length() > mBaseLength) {
					File f = new File(mPath);
					mFocusFile = f.getName();
					mFocusIndex = 0;
					f = f.getParentFile();
					mPath = f.getPath();
					updateList();
					return true;
				}
				break;

			case KeyEvent.KEYCODE_DPAD_RIGHT:
				{
					Map map = (Map) getListView().getItemAtPosition(getListView().getSelectedItemPosition());
					String path = (String)map.get("path");
					if ((new File(path)).isDirectory()) {
						mPath = path;
				        mFocusFile = null;
						updateList();
					} else {
						processFile(path, false);
					}
                    return true;
				}

			default:
				break;
		}
		return super.onKeyDown(keyCode, event);
	}

	public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);
        setupPath();
        updateList();
    }

    protected List getData()
    {
        List myData = new ArrayList<HashMap>();

        File f = new File(mPath);
        if (!f.exists()) {
        	addItem(myData, "!LayoutTests path missing!", "");
        	return myData;
        }
        String[] files = f.list();
        Arrays.sort(files);

        for (int i = 0; i < files.length; i++) {
        	StringBuilder sb = new StringBuilder(mPath);
        	sb.append(File.separatorChar);
        	sb.append(files[i]);
        	String path = sb.toString();
        	File c = new File(path);
        	if (fileFilter(c)) {
	        	if (c.isDirectory()) {
	        		addItem(myData, "<"+files[i]+">", path);
	        		if (mFocusFile != null && mFocusFile.equals(files[i]))
	        			mFocusIndex = myData.size()-1;
	        	}
	        	else
	        	    addItem(myData, files[i], path);
        	}
        }

        return myData;
    }

    protected void addItem(List<Map> data, String name, String path)
    {
        HashMap temp = new HashMap();
        temp.put("title", name);
        temp.put("path", path);
        data.add(temp);
    }

    protected void onListItemClick(ListView l, View v, int position, long id)
    {
        Map map = (Map) l.getItemAtPosition(position);
        final String path = (String)map.get("path");

        if ((new File(path)).isDirectory()) {
            final CharSequence[] items = {"Open", "Run"};
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("Select an Action");
            builder.setSingleChoiceItems(items, -1,
                    new DialogInterface.OnClickListener(){
                public void onClick(DialogInterface dialog, int which) {
                    switch (which) {
                        case OPEN_DIRECTORY:
                            dialog.dismiss();
                            mPath = path;
                            mFocusFile = null;
                            updateList();
                            break;
                        case RUN_TESTS:
                            dialog.dismiss();
                            processDirectory(path, false);
                            break;
                    }
                }
            });
            builder.create().show();
        } else {
            processFile(path, false);
        }
    }

    /*
     * This function is called when the user has selected a directory in the
     * list and wants to perform an action on it instead of navigating into
     * the directory.
     */
    abstract void processDirectory(String path, boolean selection);
    /*
     * This function is called when the user has selected a file in the
     * file list. The selected file could be a file or a directory.
     * The flag indicates if this was from a selection or not.
     */
    abstract void processFile(String filename, boolean selection);

    /*
     * This function is called when the file list is being built. Return
     * true if the file is to be added to the file list.
     */
    abstract boolean fileFilter(File f);

    protected void updateList() {
        setListAdapter(new SimpleAdapter(this,
                getData(),
                android.R.layout.simple_list_item_1,
                new String[] {"title"},
                new int[] {android.R.id.text1}));
        String title = mPath; //.substring(mBaseLength-11); // show the word LayoutTests
        setTitle(title);
        getListView().setSelection(mFocusIndex);
    }

    protected void setupPath() {
        mPath = Environment.getExternalStorageDirectory() + "/android/layout_tests";
        mBaseLength = mPath.length();
    }

    protected String mPath;
    protected int mBaseLength;
    protected String mFocusFile;
    protected int mFocusIndex;
    
    private final static int OPEN_DIRECTORY = 0;
    private final static int RUN_TESTS = 1;

}