source: other-projects/tipple-android/trunk/src/org/greenstone/android/tipple/TippleLogFileBrowser.java@ 23977

/*
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Based on FileBrowser.java from mapsforge.org
 * 
 */

package org.greenstone.android.tipple;

import java.io.File;
import java.io.FileFilter;
import java.util.Arrays;
import java.util.Comparator;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.KeyEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.GridView;

/**
 * Simple file browser activity to select a log file from the file system.
 */
public class TippleLogFileBrowser extends Activity implements AdapterView.OnItemClickListener 
{
    private static final String DEFAULT_DIRECTORY = "/";
    private static final int DIALOG_LOG_FILE_INVALID = 0;
    private static final int DIALOG_LOG_FILE_SELECT = 1;
    private static final String PREFERENCES_FILE = "FileBrowser";
    private File currentDirectory;
    private TippleLogFileBrowserIconAdapter fileBrowserIconAdapter;
    private Comparator<File> fileComparator;
    private FileFilter fileFilter;
    private File[] files;
    private File[] filesWithParentFolder;
    private GridView gridView;
    private File selectedFile;

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long id) {
        this.selectedFile = this.files[(int) id];
        if (this.selectedFile.isDirectory()) {
            this.currentDirectory = this.selectedFile;
            browseToCurrentDirectory();
        } else if (this.selectedFile.getAbsolutePath().endsWith(".log")) {
            String log_filename = selectedFile.getAbsolutePath();
            Intent ok_intent = new Intent();
            ok_intent.putExtra("logFile", log_filename);
                    
            setResult(RESULT_OK, ok_intent);
            finish();
        } else {
            showDialog(DIALOG_LOG_FILE_INVALID);
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            // quit the application
            setResult(RESULT_CANCELED);
            finish();
            return true;
        }
        return false;
    }

    /**
     * Browse to the current directory.
     */
    private void browseToCurrentDirectory() {
        setTitle(this.currentDirectory.getAbsolutePath());

        // read and filter files and subfolders in the current folder
        this.files = this.currentDirectory.listFiles(this.fileFilter);

        // order all files by type and alphabetically by name
        Arrays.sort(this.files, this.fileComparator);

        // if a parent directory exists, add it at the first position
        if (this.currentDirectory.getParentFile() != null) {
            this.filesWithParentFolder = new File[this.files.length + 1];
            this.filesWithParentFolder[0] = this.currentDirectory.getParentFile();
            System.arraycopy(this.files, 0, this.filesWithParentFolder, 1, this.files.length);
            this.files = this.filesWithParentFolder;
            this.fileBrowserIconAdapter.updateFiles(this.files, true);
        } else {
            this.fileBrowserIconAdapter.updateFiles(this.files, false);
        }
        this.fileBrowserIconAdapter.notifyDataSetChanged();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.filebrowser);
        this.fileBrowserIconAdapter = new TippleLogFileBrowserIconAdapter(this);
        this.gridView = (GridView) findViewById(R.id.fileBrowserView);
        this.gridView.setOnItemClickListener(this);
        this.gridView.setAdapter(this.fileBrowserIconAdapter);

        this.fileFilter = new FileFilter() {
            @Override
            public boolean accept(File pathname) {
                if (pathname.isDirectory()) {
                    // accept all readable folders
                    return pathname.canRead();
                }
                // accept all readable files with the correct extension
                return pathname.canRead() && pathname.getName().endsWith(".log");
            }
        };

        this.fileComparator = new Comparator<File>() {
            @Override
            public int compare(File o1, File o2) {
                if (o1.isDirectory() && !o2.isDirectory()) {
                    return -1;
                } else if (!o1.isDirectory() && o2.isDirectory()) {
                    return 1;
                } else {
                    return o1.getName().compareToIgnoreCase(o2.getName());
                }
            }
        };

        /*
        if (savedInstanceState == null) {
            // first start of this instance
            showDialog(DIALOG_LOG_FILE_SELECT);
        }
         
         */
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        switch (id) {
            case DIALOG_LOG_FILE_INVALID:
                builder.setMessage(getString(R.string.log_file_invalid)).setTitle(
                        getString(R.string.error)).setPositiveButton(getString(R.string.ok),
                        null);
                return builder.create();
            case DIALOG_LOG_FILE_SELECT:
                builder.setMessage(getString(R.string.log_file_select)).setPositiveButton(
                        getString(R.string.ok), null);
                return builder.create();
            default:
                return null;
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        // save the current directory
        Editor editor = getSharedPreferences(PREFERENCES_FILE, MODE_PRIVATE).edit();
        editor.clear();
        if (this.currentDirectory != null) {
            editor.putString("currentDirectory", this.currentDirectory.getAbsolutePath());
        }
        editor.commit();
    }

    @Override
    protected void onResume() {
        super.onResume();
        // check if the full screen mode should be activated
        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean("fullscreen", false)) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
        } else {
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
        }

        // restore the current directory
        SharedPreferences preferences = getSharedPreferences(PREFERENCES_FILE, MODE_PRIVATE);
        this.currentDirectory = new File(preferences.getString("currentDirectory",
                DEFAULT_DIRECTORY));
        if (!this.currentDirectory.exists() || !this.currentDirectory.canRead()) {
            this.currentDirectory = new File(DEFAULT_DIRECTORY);
        }
        browseToCurrentDirectory();
    }
}