2个星期轻松学会安卓android开发

package com.lxt008; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.Collections; import java.util.List; import android.app.AlertDialog; import android.app.ListActivity; import android.app.AlertDialog.Builder; import android.content.DialogInterface; import android.content.Intent; import android.content.DialogInterface.OnClickListener; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.EditText; import android.widget.ListView; import android.widget.TextView; public class FileManager extends ListActivity { private List<IconifiedText> directoryEntries = new ArrayList<IconifiedText>(); private File currentDirectory = new File("/"); private File myTmpFile = null; private int myTmpOpt = -1; /** Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); browseToRoot(); this.setSelection(0); } //浏览文件系统的根目录 private void browseToRoot() { browseTo(new File("/")); } //返回上一级目录 private void upOneLevel() { if(this.currentDirectory.getParent() != null) this.browseTo(this.currentDirectory.getParentFile()); } //浏览指定的目录,如果是文件则进行打开操作 private void browseTo(final File file) { this.setTitle(file.getAbsolutePath()); if (file.isDirectory()) { this.currentDirectory = file; fill(file.listFiles()); } else { fileOptMenu(file); } } //打开指定文件 protected void openFile(File aFile) { Intent intent = new Intent(); intent.setAction(android.content.Intent.ACTION_VIEW); File file = new File(aFile.getAbsolutePath()); // 取得文件名 String fileName = file.getName(); // 根据不同的文件类型来打开文件 if (checkEndsWithInStringArray(fileName, getResources().getStringArray(R.array.fileEndingImage))) { intent.setDataAndType(Uri.fromFile(file), "image/*"); } else if (checkEndsWithInStringArray(fileName, getResources().getStringArray(R.array.fileEndingAudio))) { intent.setDataAndType(Uri.fromFile(file), "audio/*"); } else if (checkEndsWithInStringArray(fileName, getResources().getStringArray(R.array.fileEndingVideo))) { intent.setDataAndType(Uri.fromFile(file), "video/*"); } startActivity(intent); } //这里可以理解为设置ListActivity的源 private void fill(File[] files) { //清空列表 this.directoryEntries.clear(); //添加一个当前目录的选项 this.directoryEntries.add(new IconifiedText(getString(R.string.current_dir), getResources().getDrawable(R.drawable.folder))); //如果不是根目录则添加上一级目录项 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) { //判断是一个文件夹还是一个文件 if (currentFile.isDirectory()) { currentIcon = getResources().getDrawable(R.drawable.folder); } else { //取得文件名 String fileName = currentFile.getName(); //根据文件名来判断文件类型，设置不同的图标 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 if (checkEndsWithInStringArray(fileName, getResources().getStringArray(R.array.fileEndingVideo))) { currentIcon = getResources().getDrawable(R.drawable.video); } else { currentIcon = getResources().getDrawable(R.drawable.text); } } //确保只显示文件名、不显示路径如：/sdcard/111.txt就只是显示111.txt int currentPathStringLenght = this.currentDirectory.getAbsolutePath().length(); this.directoryEntries.add(new IconifiedText(currentFile.getAbsolutePath().substring(currentPathStringLenght), currentIcon)); } Collections.sort(this.directoryEntries); IconifiedTextListAdapter itla = new IconifiedTextListAdapter(this); //将表设置到ListAdapter中 itla.setListItems(this.directoryEntries); //为ListActivity添加一个ListAdapter this.setListAdapter(itla); } protected void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id); // 取得选中的一项的文件名 String selectedFileString = this.directoryEntries.get(position).getText(); if (selectedFileString.equals(getString(R.string.current_dir))) { //如果选中的是刷新 this.browseTo(this.currentDirectory); } else if (selectedFileString.equals(getString(R.string.up_one_level))) { //返回上一级目录 this.upOneLevel(); } else { File clickedFile = null; clickedFile = new File(this.currentDirectory.getAbsolutePath()+ this.directoryEntries.get(position).getText()); if(clickedFile != null) this.browseTo(clickedFile); } } //通过文件名判断是什么类型的文件 private boolean checkEndsWithInStringArray(String checkItsEnd, String[] fileEndings) { for(String aEnd : fileEndings) { if(checkItsEnd.endsWith(aEnd)) return true; } return false; } public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(0, 0, 0, "新建目录").setIcon(R.drawable.addfolderr); menu.add(0, 1, 0, "删除目录").setIcon(R.drawable.delete); menu.add(0, 2, 0, "粘贴文件").setIcon(R.drawable.paste); menu.add(0, 3, 0, "根目录").setIcon(R.drawable.goroot); menu.add(0, 4, 0, "上一级").setIcon(R.drawable.uponelevel); return true; } public boolean onOptionsItemSelected(MenuItem item) { super.onOptionsItemSelected(item); switch (item.getItemId()) { case 0: Mynew(); break; case 1: //注意：删除目录，谨慎操作，该例子提供了 //deleteFile（删除文件）和deleteFolder（删除整个目录） MyDelete(); break; case 2: MyPaste(); break; case 3: this.browseToRoot(); break; case 4: this.upOneLevel(); break; } return false; } @Override public boolean onPrepareOptionsMenu(Menu menu) { return super.onPrepareOptionsMenu(menu); } //粘贴操作 public void MyPaste() { if ( myTmpFile == null ) { Builder builder = new Builder(FileManager.this); builder.setTitle("提示"); builder.setMessage("没有复制或剪切操作"); builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); builder.setCancelable(false); builder.create(); builder.show(); } else { if ( myTmpOpt == 0 )//复制操作 { if(new File(GetCurDirectory()+"/"+myTmpFile.getName()).exists()) { Builder builder = new Builder(FileManager.this); builder.setTitle("粘贴提示"); builder.setMessage("该目录有相同的文件，是否需要覆盖？"); builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener() { public void onClick(DialogInterface dialog, int which) { copyFile(myTmpFile,new File(GetCurDirectory()+"/"+myTmpFile.getName())); browseTo(new File(GetCurD