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：

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