转载地址：点击打开
这是一个简单的只有3个按钮的程序，3个按钮分别对应三种工作的模式(保存、打开和文件夹选择)。封装的SimpleFileDialog.java的内容如下：
package com.example.test;
/*
*
* This file is licensed under The Code Project Open License (CPOL) 1.02
* http://www.codeproject.com/info/cpol10.aspx
* http://www.codeproject.com/info/CPOL.zip
*
* License Preamble:
* This License governs Your use of the Work. This License is intended to allow developers to use the Source
* Code and Executable Files provided as part of the Work in any application in any form.
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* Source Code and Executable Files can be redistributed; and
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* No claim of suitability, guarantee, or any warranty whatsoever is provided. The software is provided "as-is".
* The Article(s) accompanying the Work may not be distributed or republished without the Author‘s consent
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* the Work licensed pursuant to this License and the individual or other entity which offers the Work
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import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
//import android.content.DialogInterface.OnKeyListener;
import android.os.Environment;
import android.text.Editable;
import android.view.Gravity;
//import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class SimpleFileDialog {
private int FileOpen = 0;
private int FileSave = 1;
private int FolderChoose = 2;
private int Select_type = FileSave;
private String m_sdcardDirectory = "";
private Context m_context;
private TextView m_titleView1;
private TextView m_titleView;
public String Default_File_Name = "default.txt";
private String Selected_File_Name = Default_File_Name;
private EditText input_text;
private String m_dir = "";
private List<String> m_subdirs = null;
private SimpleFileDialogListener m_SimpleFileDialogListener = null;
private ArrayAdapter<String> m_listAdapter = null;
// ////////////////////////////////////////////////////
// Callback interface for selected directory
// ////////////////////////////////////////////////////
public interface SimpleFileDialogListener {
public void onChosenDir(String chosenDir);
}
public SimpleFileDialog(Context context, String file_select_type,
SimpleFileDialogListener SimpleFileDialogListener) {
if (file_select_type.equals("FileOpen"))
Select_type = FileOpen;
else if (file_select_type.equals("FileSave"))
Select_type = FileSave;
else if (file_select_type.equals("FolderChoose"))
Select_type = FolderChoose;
else
Select_type = FileOpen;
m_context = context;
m_sdcardDirectory = Environment.getExternalStorageDirectory()
.getAbsolutePath();
m_SimpleFileDialogListener = SimpleFileDialogListener;
try {
m_sdcardDirectory = new File(m_sdcardDirectory).getCanonicalPath();
} catch (IOException ioe) {
}
}
// /////////////////////////////////////////////////////////////////////
// chooseFile_or_Dir() - load directory chooser dialog for initial
// default sdcard directory
// /////////////////////////////////////////////////////////////////////
public void chooseFile_or_Dir() {
// Initial directory is sdcard directory
if (m_dir.equals(""))
chooseFile_or_Dir(m_sdcardDirectory);
else
chooseFile_or_Dir(m_dir);
}
// //////////////////////////////////////////////////////////////////////////////
// chooseFile_or_Dir(String dir) - load directory chooser dialog for initial
// input ‘dir‘ directory
// //////////////////////////////////////////////////////////////////////////////
public void chooseFile_or_Dir(String dir) {
File dirFile = new File(dir);
if (!dirFile.exists() || !dirFile.isDirectory()) {
dir = m_sdcardDirectory;
}
try {
dir = new File(dir).getCanonicalPath();
} catch (IOException ioe) {
return;
}
m_dir = dir;
m_subdirs = getDirectories(dir);
class SimpleFileDialogOnClickListener implements
DialogInterface.OnClickListener {
public void onClick(DialogInterface dialog, int item) {
String m_dir_old = m_dir;
String sel = ""
+ ((AlertDialog) dialog).getListView().getAdapter()
.getItem(item);
if (sel.charAt(sel.length() - 1) == ‘/‘)
sel = sel.substring(0, sel.length() - 1);
// Navigate into the sub-directory
if (sel.equals("..")) {
m_dir = m_dir.substring(0, m_dir.lastIndexOf("/"));
} else {
m_dir += "/" + sel;
}
Selected_File_Name = Default_File_Name;
if ((new File(m_dir).isFile())) // If the selection is a regular
// file
{
m_dir = m_dir_old;
Selected_File_Name = sel;
}
updateDirectory();
}
}
AlertDialog.Builder dialogBuilder = createDirectoryChooserDialog(dir,
m_subdirs, new SimpleFileDialogOnClickListener());
dialogBuilder.setPositiveButton("OK", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Current directory chosen
// Call registered listener supplied with the chosen directory
if (m_SimpleFileDialogListener != null) {
{
if (Select_type == FileOpen || Select_type == FileSave) {
Selected_File_Name = input_text.getText() + "";
m_SimpleFileDialogListener.onChosenDir(m_dir + "/"
+ Selected_File_Name);
} else {
m_SimpleFileDialogListener.onChosenDir(m_dir);
}
}
}
}
}).setNegativeButton("Cancel", null);
final AlertDialog dirsDialog = dialogBuilder.create();
// Show directory chooser dialog
dirsDialog.show();
}
private boolean createSubDir(String newDir) {
File newDirFile = new File(newDir);
if (!newDirFile.exists())
return newDirFile.mkdir();
else
return false;
}
private List<String> getDirectories(String dir) {
List<String> dirs = new ArrayList<String>();
try {
File dirFile = new File(dir);
// if directory is not the base sd card directory add ".." for going
// up one directory
if (!m_dir.equals(m_sdcardDirectory))
dirs.add("..");
if (!dirFile.exists() || !dirFile.isDirectory()) {
return dirs;
}
for (File file : dirFile.listFiles()) {
if (file.isDirectory()) {
// Add "/" to directory names to identify them in the list
dirs.add(file.getName() + "/");
} else if (Select_type == FileSave || Select_type == FileOpen) {
// Add file names to the list if we are doing a file save or
// file open operation
dirs.add(file.getName());
}
}
} catch (Exception e) {
}
Collections.sort(dirs, new Comparator<String>() {
public int compare(String o1, String o2) {
return o1.compareTo(o2);
}
});
return dirs;
}
// ////////////////////////////////////////////////////////////////////////////////////////////////////////
// //// START DIALOG DEFINITION //////
// ////////////////////////////////////////////////////////////////////////////////////////////////////////
private AlertDialog.Builder createDirectoryChooserDialog(String title,
List<String> listItems,
DialogInterface.OnClickListener onClickListener) {
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(m_context);
// //////////////////////////////////////////////
// Create title text showing file select type //
// //////////////////////////////////////////////
m_titleView1 = new TextView(m_context);
m_titleView1.setLayoutParams(new LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
// m_titleView1.setTextAppearance(m_context,
// android.R.style.TextAppearance_Large);
// m_titleView1.setTextColor(
// m_context.getResources().getColor(android.R.color.black) );
if (Select_type == FileOpen)
m_titleView1.setText("Open:");
if (Select_type == FileSave)
m_titleView1.setText("Save As:");
if (Select_type == FolderChoose)
m_titleView1.setText("Folder Select:");
// need to make this a variable Save as, Open, Select Directory
m_titleView1.setGravity(Gravity.CENTER_VERTICAL);
m_titleView1.setBackgroundColor(-12303292); // dark gray -12303292
m_titleView1.setTextColor(m_context.getResources().getColor(
android.R.color.white));
// Create custom view for AlertDialog title
LinearLayout titleLayout1 = new LinearLayout(m_context);
titleLayout1.setOrientation(LinearLayout.VERTICAL);
titleLayout1.addView(m_titleView1);
if (Select_type == FolderChoose || Select_type == FileSave) {
// /////////////////////////////
// Create New Folder Button //
// /////////////////////////////
Button newDirButton = new Button(m_context);
newDirButton.setLayoutParams(new LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
newDirButton.setText("New Folder");
newDirButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final EditText input = new EditText(m_context);
// Show new folder name input dialog
new AlertDialog.Builder(m_context)
.setTitle("New Folder Name")
.setView(input)
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface dialog,
int whichButton) {
Editable newDir = input.getText();
String newDirName = newDir
.toString();
// Create new directory
if (createSubDir(m_dir + "/"
+ newDirName)) {
// Navigate into the new
// directory
m_dir += "/" + newDirName;
updateDirectory();
} else {
Toast.makeText(
m_context,
"Failed to create ‘"
+ newDirName
+ "‘ folder",
Toast.LENGTH_SHORT)
.show();
}
}
}).setNegativeButton("Cancel", null).show();
}
});
titleLayout1.addView(newDirButton);
}
// ///////////////////////////////////////////////////
// Create View with folder path and entry text box //
// ///////////////////////////////////////////////////
LinearLayout titleLayout = new LinearLayout(m_context);
titleLayout.setOrientation(LinearLayout.VERTICAL);
m_titleView = new TextView(m_context);
m_titleView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT));
m_titleView.setBackgroundColor(-12303292); // dark gray -12303292
m_titleView.setTextColor(m_context.getResources().getColor(
android.R.color.white));
m_titleView.setGravity(Gravity.CENTER_VERTICAL);
m_titleView.setText(title);
titleLayout.addView(m_titleView);
if (Select_type == FileOpen || Select_type == FileSave) {
input_text = new EditText(m_context);
input_text.setText(Default_File_Name);
titleLayout.addView(input_text);
}
// ////////////////////////////////////////
// Set Views and Finish Dialog builder //
// ////////////////////////////////////////
dialogBuilder.setView(titleLayout);
dialogBuilder.setCustomTitle(titleLayout1);
m_listAdapter = createListAdapter(listItems);
dialogBuilder.setSingleChoiceItems(m_listAdapter, -1, onClickListener);
dialogBuilder.setCancelable(false);
return dialogBuilder;
}
private void updateDirectory() {
m_subdirs.clear();
m_subdirs.addAll(getDirectories(m_dir));
m_titleView.setText(m_dir);
m_listAdapter.notifyDataSetChanged();
// #scorch
if (Select_type == FileSave || Select_type == FileOpen) {
input_text.setText(Selected_File_Name);
}
}
private ArrayAdapter<String> createListAdapter(List<String> items) {
return new ArrayAdapter<String>(m_context,
android.R.layout.select_dialog_item, android.R.id.text1, items) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
if (v instanceof TextView) {
// Enable list item (directory) text wrapping
TextView tv = (TextView) v;
tv.getLayoutParams().height = LayoutParams.WRAP_CONTENT;
tv.setEllipsize(null);
}
return v;
}
};
}
}
MainActivity.java：
package com.example.test;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Button1
Button dirChooserButton1 = (Button) findViewById(R.id.button1);
dirChooserButton1.setOnClickListener(new OnClickListener()
{
String m_chosen;
@Override
public void onClick(View v) {
/////////////////////////////////////////////////////////////////////////////////////////////////
//Create FileOpenDialog and register a callback
/////////////////////////////////////////////////////////////////////////////////////////////////
SimpleFileDialog FileOpenDialog = new SimpleFileDialog(MainActivity.this, "FileOpen",
new SimpleFileDialog.SimpleFileDialogListener()
{
@Override
public void onChosenDir(String chosenDir)
{
// The code in this function will be executed when the dialog OK button is pushed
m_chosen = chosenDir;
Toast.makeText(MainActivity.this, "Chosen FileOpenDialog File: " +
m_chosen, Toast.LENGTH_LONG).show();
}
});
//You can change the default filename using the public variable "Default_File_Name"
FileOpenDialog.Default_File_Name = "";
FileOpenDialog.chooseFile_or_Dir();
/////////////////////////////////////////////////////////////////////////////////////////////////
}
});
//Button2
Button dirChooserButton2 = (Button) findViewById(R.id.button2);
dirChooserButton2.setOnClickListener(new OnClickListener()
{
String m_chosen;
@Override
public void onClick(View v) {
/////////////////////////////////////////////////////////////////////////////////////////////////
//Create FileSaveDialog and register a callback
/////////////////////////////////////////////////////////////////////////////////////////////////
SimpleFileDialog FileSaveDialog = new SimpleFileDialog(MainActivity.this, "FileSave",
new SimpleFileDialog.SimpleFileDialogListener()
{
@Override
public void onChosenDir(String chosenDir)
{
// The code in this function will be executed when the dialog OK button is pushed
m_chosen = chosenDir;
Toast.makeText(MainActivity.this, "Chosen FileOpenDialog File: " +
m_chosen, Toast.LENGTH_LONG).show();
}
});
//You can change the default filename using the public variable "Default_File_Name"
FileSaveDialog.Default_File_Name = "my_default.txt";
FileSaveDialog.chooseFile_or_Dir();
/////////////////////////////////////////////////////////////////////////////////////////////////
}
});
//Button3
Button dirChooserButton3 = (Button) findViewById(R.id.button3);
dirChooserButton3.setOnClickListener(new OnClickListener()
{
String m_chosen;
@Override
public void onClick(View v) {
/////////////////////////////////////////////////////////////////////////////////////////////////
//Create FileOpenDialog and register a callback
/////////////////////////////////////////////////////////////////////////////////////////////////
SimpleFileDialog FolderChooseDialog = new SimpleFileDialog(MainActivity.this, "FolderChoose",
new SimpleFileDialog.SimpleFileDialogListener()
{
@Override
public void onChosenDir(String chosenDir)
{
// The code in this function will be executed when the dialog OK button is pushed
m_chosen = chosenDir;
Toast.makeText(MainActivity.this, "Chosen FileOpenDialog File: " +
m_chosen, Toast.LENGTH_LONG).show();
}
});
FolderChooseDialog.chooseFile_or_Dir();
/////////////////////////////////////////////////////////////////////////////////////////////////
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
当然需要相应的权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
最后来几张图片：
时间： 2024-10-04 22:05:11