Android实现文件夹目录选择器

chooserdialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="40dip">
    <Button
        android:layout_width="40dip"
        android:layout_height="40dip"
        android:text="HOME"
        android:id="@+id/btn_home"
        android:layout_gravity="left"
        android:layout_weight="1"
    />
    <LinearLayout android:layout_width="140dip"
        android:layout_height="35dip"
        android:id="@+id/dir_layout"
        android:gravity="center"
        android:layout_weight="1">
        </LinearLayout>
    <!--  <TextView 
        android:layout_width="140dip"
        android:layout_height="35dip"
        android:id="@+id/dir_str"
        android:gravity="center"
        android:layout_weight="1"
    /> -->
    <Button
        android:layout_width="40dip"
        android:layout_height="40dip"
        android:text="BACK"
        android:id="@+id/btn_back"
        android:layout_gravity="right"
        android:layout_weight="1"
    />
    </LinearLayout>
    <ListView
        android:layout_width="fill_parent"
        android:layout_height="300dip"
        android:id="@+id/list_dir"
    />
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn_ok"
        android:text="OK"/>
</LinearLayout>

package hkp.dirchooser;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.Gravity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

/**
* @author HKP女生发型
* 2011-6-17
*
*/
public class DirChooserDialog extends Dialog implements android.view.View.OnClickListener{

private ListView list;
ArrayAdapter<String> Adapter;
ArrayList<String> arr=new ArrayList<String>();

Context context;
private String path;

private TextView title;
private EditText et;
private Button home,back,ok;
private LinearLayout titleView;

private int type = 1;
private String[] fileType = null;

public final static int TypeOpen = 1;
public final static int TypeSave = 2;

/**
* @param context
* @param type 值为1表示创建打开目录类型的对话框，2为创建保存文件到目录类型的对话框
* @param fileType 要过滤的文件类型,null表示只选择目录
* @param resultPath 点OK按钮返回的结果，目录或者目录+文件名
*/
public DirChooserDialog(Context context,int type,String[]fileType,String resultPath) {
super(context);
// TODO Auto-generated constructor stub
this.context = context;
this.type = type;
this.fileType = fileType;
this.path = resultPath;
}
/* (non-Javadoc)
* @see android.app.Dialog#dismiss()
*/
@Override
public void dismiss() {
// TODO Auto-generated method stub
super.dismiss();
}
/* (non-Javadoc)
* @see android.app.Dialog#onCreate(android.os.Bundle)
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.chooserdialog);

path = getRootDir();
arr = (ArrayList<String>) getDirs(path);
Adapter = new ArrayAdapter<String>(context,android.R.layout.simple_list_item_1, arr);

list = (ListView)findViewById(R.id.list_dir);
list.setAdapter(Adapter);

list.setOnItemClickListener(lvLis);

home = (Button) findViewById(R.id.btn_home);Java多级目录的生成

home.setOnClickListener(this);

back = (Button) findViewById(R.id.btn_back);
back.setOnClickListener(this);

ok = (Button) findViewById(R.id.btn_ok);
ok.setOnClickListener(this);

titleView = (LinearLayout) findViewById(R.id.dir_layout);

if(type == TypeOpen){
title = new TextView(context);
titleView.addView(title);
title.setText(path);
}else if(type == TypeSave){
et = new EditText(context);
et.setWidth(240);
et.setHeight(70);
et.setGravity(Gravity.CENTER);
et.setPadding(0, 2, 0, 0);
titleView.addView(et);
et.setText("wfFileName");
}
// title = (TextView) findViewById(R.id.dir_str);
// title.setText(path);

}
//动态更新ListView
Runnable add=new Runnable(){

@Override
public void run() {
// TODO Auto-generated method stub
arr.clear();
//System.out.println("Runnable path:"+path);

//必须得用这种方法为arr赋值才能更新
List<String> temp = getDirs(path);
for(int i = 0;i < temp.size();i++)
arr.add(temp.get(i));
Adapter.notifyDataSetChanged();
}
};

private OnItemClickListener lvLis=new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
String temp = (String) arg0.getItemAtPosition(arg2);
//System.out.println("OnItemClick path1:"+path);
if(temp.equals(".."))
path = getSubDir(path);
else if(path.equals("/"))
path = path+temp;
else
path = path+"/"+temp;

//System.out.println("OnItemClick path2"+path);
if(type == TypeOpen)
title.setText(path);

Handler handler=new Handler();
handler.post(add);
}
};

private List<String> getDirs(String ipath){
List<String> file = new ArrayList<String>();
//System.out.println("GetDirs path:"+ipath);
File[] myFile = new File(ipath).listFiles();
if(myFile == null){
file.add("..");

}else
for(File f: myFile){
//过滤目录
if(f.isDirectory()){
String tempf = f.toString();
int pos = tempf.lastIndexOf("/");
String subTemp = tempf.substring(pos+1, tempf.length());
// String subTemp = tempf.substring(path.length(),tempf.length());
file.add(subTemp);
//System.out.println("files in dir:"+subTemp);
}
//过滤知道类型的文件
if(f.isFile() && fileType != null){
for(int i = 0;i< fileType.length;i++){
int typeStrLen = fileType[i].length();

String fileName = f.getPath().substring(f.getPath().length()- typeStrLen);
if (fileName.toLowerCase().equals(fileType[i])) {
file.add(f.toString().substring(path.length()+1,f.toString().length()));
}
}
}
}

if(file.size()==0)
file.add("..");

// System.out.println("file[0]:"+file.get(0)+" File size:"+file.size());
return file;
}
/* (non-Javadoc)
* @see android.view.View.OnClickListener#onClick(android.view.View)
*/
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId() == home.getId()){
path = getRootDir();
if(type == TypeOpen)
title.setText(path);
Handler handler=new Handler();
handler.post(add);
}else if(v.getId() == back.getId()){
path = getSubDir(path);
if(type == TypeOpen)
title.setText(path);
Handler handler=new Handler();
handler.post(add);
}else if(v.getId() == ok.getId()){
dismiss();
if(type == TypeSave)
path = path+"/"+et.getEditableText().toString()+".wf";
Toast.makeText(context, path, Toast.LENGTH_SHORT).show();
}


}

private String getSDPath(){
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState()
.equals(android.os.Environment.MEDIA_MOUNTED); //判断sd卡是否存在
if(sdCardExist)
{
sdDir = Environment.getExternalStorageDirectory();//获取根目录
}
if(sdDir == null){
//Toast.makeText(context, "No SDCard inside!",Toast.LENGTH_SHORT).show();
return null;
}
return sdDir.toString();

}

private String getRootDir(){
String root = "/";

path = getSDPath();
if (path == null)
path="/";

return root;
}

private String getSubDir(String path){
String subpath = null;

int pos = path.lastIndexOf("/");

if(pos == path.length()){
path = path.substring(0,path.length()-1);
pos = path.lastIndexOf("/");
}

subpath = path.substring(0,pos);

if(pos == 0)
subpath = path;

return subpath;
}
}

 package hkp.dirchooser;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.btn_open);
btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String path = null;
String [] fileType = {"dst"};//要过滤的文件类型列表
DirChooserDialog dlg = new DirChooserDialog(MainActivity.this,2,fileType,path);
dlg.setTitle("Choose dst file dir");
dlg.show();

}
});
}
}