安卓开发实例 文件浏览器

/* * [程序名称] Android 文件浏览器 * [作者] xmobileapp团队 * [参考资料] www.anddev.org * [开源协议] Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0) * * 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.xmobileapp.filebrowser; import java.io.File; import java.util.ArrayList; import java.util.Collections; import java.util.List; import com.xmobileapp.filebrowser.iconifiedlist.IconifiedText; import com.xmobileapp.filebrowser.iconifiedlist.IconifiedTextListAdapter; import android.app.AlertDialog; import android.app.ListActivity; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.view.View; import android.widget.ListView; public class FileBrowser extends ListActivity { private enum DISPLAYMODE{ ABSOLUTE, RELATIVE; } protected static final int SUB_ACTIVITY_REQUEST_CODE = 1337; private final DISPLAYMODE displayMode = DISPLAYMODE.RELATIVE; private List<IconifiedText> directoryEntries = new ArrayList<IconifiedText>(); private File currentDirectory = new File("/"); /** Activity被创建时调用 */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setTheme(android.R.style.Theme_Black); browseToRoot(); this.setSelection(0); } /** * This function browses to the * root-directory of the file-system. */ private void browseToRoot() { browseTo(new File("/")); } /** * This function browses up one level * according to the field: currentDirectory */ private void upOneLevel(){ if(this.currentDirectory.getParent() != null) this.browseTo(this.currentDirectory.getParentFile()); } private void browseTo(final File aDirectory){ // On relative we display the full path in the title. if(this.displayMode == DISPLAYMODE.RELATIVE) this.setTitle(aDirectory.getAbsolutePath() + " :: " + getString(R.string.app_name)); if (aDirectory.isDirectory()){ this.currentDirectory = aDirectory; fill(aDirectory.listFiles()); }else{ // Show an Alert with the ButtonListeners we created new AlertDialog.Builder(this).setTitle("提示") .setMessage("本例不支持文件打开操作！") .create().show(); } } private void fill(File[] files) { this.directoryEntries.clear(); // Add the "." == "current directory" this.directoryEntries.add(new IconifiedText( getString(R.string.current_dir), getResources().getDrawable(R.drawable.folder))); // and the ".." == 'Up one level' if(this.currentDirectory.getParent() != null) this.directoryEntries.add(new IconifiedText( getString(R.string.up_one_level), getResources().getDrawable(R.drawable.uponelevel))); Drawable currentIcon = null; for (File currentFile : files){ if (currentFile.isDirectory()) { currentIcon = getResources().getDrawable(R.drawable.folder); }else{ String fileName = currentFile.getName(); /* Determine the Icon to be used, * depending on the FileEndings defined in: * res/values/fileendings.xml. */ if(checkEndsWithInStringArray(fileName, getResources(). getStringArray(R.array.fileEndingImage))){ currentIcon = getResources().getDrawable(R.drawable.image); }else if(checkEndsWithInStringArray(fileName, getResources(). getStringArray(R.array.fileEndingWebText))){ currentIcon = getResources().getDrawable(R.drawable.webtext); }else if(checkEndsWithInStringArray(fileName, getResources(). getStringArray(R.array.fileEndingPackage))){ currentIcon = getResources().getDrawable(R.drawable.packed); }else if(checkEndsWithInStringArray(fileName, getResources(). getStringArray(R.array.fileEndingAudio))){ currentIcon = getResources().getDrawable(R.drawable.audio); }else{ currentIcon = getResources().getDrawable(R.drawable.text); } } switch (this.displayMode) { case ABSOLUTE: /* On absolute Mode, we show the full path */ this.directoryEntries.add(new IconifiedText(currentFile .getPath(), currentIcon)); break; case RELATIVE: /* On relative Mode, we have to cut the * current-path at the beginning */ int currentPathStringLenght = this.currentDirectory. getAbsolutePath().length(); this.directoryEntries.add(new IconifiedText( currentFile.getAbsolutePath(). substring(currentPathStringLenght), currentIcon)); break; } } Collections.sort(this.directoryEntries); IconifiedTextListAdapter itla = new IconifiedTextListAdapter(this); itla.setListItems(this.directoryEntries); this.setListAdapter(itla); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id); int selectionRowID = (int) this.getSelectedItemId(); String selectedFileString = this.directoryEntries.get(selectionRowID).getText(); if (selectedFileString.equals(getString(R.string.current_dir))) { // Refresh this.browseTo(this.currentDirectory); } else if(selectedFileString.equals(getString(R.string.up_one_level))){ this.upOneLevel(); } else { File clickedFile = null; switch(this.displayMode){ case RELATIVE: clickedFile = new File(this.currentDirectory.getAbsolutePath() + this.directoryEntries.get(selectionRowID).getText()); break; case ABSOLUTE: clickedFile = new File(this.directoryEntries.get(selectionRowID).getText()); break; } if(clickedFile != null) this.browseTo(clickedFile); } } /** Checks whether checkItsEnd ends with * one of the Strings from fileEndings */ private boolean checkEndsWithInStringArray(String checkItsEnd, String[] fileEndings){ for(String aEnd : fileEndings){ if(checkItsEnd.endsWith(aEnd)) return true; } return false; } }