android打开文件、保存对话框、创建新文件夹对话框
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. * * The main points subject to the terms of the License are: * Source Code and Executable Files can be used in commercial applications; * Source Code and Executable Files can be redistributed; and * Source Code can be modified to create derivative works. * 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 * * This License is entered between You, the individual or other entity reading or otherwise making use of * the Work licensed pursuant to this License and the individual or other entity which offers the Work * under the terms of this License ("Author"). * (See Links above for full license text) */ 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：
