Android 选择文件对话框并将选择内容添加至ListView，并实现listview的删除与事件触发

首先是点击按钮实现选择文件对话框（参考：http://blog.youkuaiyun.com/trbbadboy/article/details/7899424）

// filename: OpenFileDialog.java 
package com.trimps.utils; 

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

import com.trimps.mobileoffice.R;

import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.Dialog; 
import android.content.Context; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.Toast; 
import android.widget.AdapterView.OnItemClickListener; 

public class OpenFileDialog { 
public static String tag = "OpenFileDialog"; 
static final public String sRoot = "/"; 
static final public String sParent = ".."; 
static final public String sFolder = "."; 
static final public String sEmpty = ""; 
static final private String sOnErrorMsg = "No rights to access!"; 

// 参数说明 
// context:上下文 
// dialogid:对话框ID 
// title:对话框标题 
// callback:一个传递Bundle参数的回调接口 
// suffix:需要选择的文件后缀，比如需要选择wav、mp3文件的时候设置为".wav;.mp3;"，注意最后需要一个分号(;) 
// images:用来根据后缀显示的图标资源ID。 
// 根目录图标的索引为sRoot; 
// 父目录的索引为sParent; 
// 文件夹的索引为sFolder; 
// 默认图标的索引为sEmpty; 
// 其他的直接根据后缀进行索引，比如.wav文件图标的索引为"wav" 
public static Dialog createDialog(int id, Context context, String title, CallbackBundle callback, String suffix, Map<String, Integer> images){
AlertDialog.Builder builder = new AlertDialog.Builder(context); 
builder.setView(new FileSelectView(context, id, callback, suffix, images)); 
Dialog dialog = builder.create(); 
//dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); 
dialog.setTitle(title); 
return dialog; 
} 

static class FileSelectView extends ListView implements OnItemClickListener{ 


private CallbackBundle callback = null; 
private String path = sRoot; 
private List<Map<String, Object>> list = null; 
private int dialogid = 0; 

private String suffix = null; 

private Map<String, Integer> imagemap = null; 

public FileSelectView(Context context, int dialogid, CallbackBundle callback, String suffix, Map<String, Integer> images) {
super(context); 
this.imagemap = images; 
this.suffix = suffix==null?"":suffix.toLowerCase(); 
this.callback = callback; 
this.dialogid = dialogid; 
this.setOnItemClickListener(this); 
refreshFileList(); 
} 

private String getSuffix(String filename){ 
int dix = filename.lastIndexOf('.'); 
if(dix<0){ 
return ""; 
} 
else{ 
return filename.substring(dix+1); 
} 
} 

private int getImageId(String s){ 
if(imagemap == null){ 
return 0; 
} 
else if(imagemap.containsKey(s)){ 
return imagemap.get(s); 
} 
else if(imagemap.containsKey(sEmpty)){ 
return imagemap.get(sEmpty); 
} 
else { 
return 0; 
} 
} 

private int refreshFileList() 
{ 
// 刷新文件列表 
File[] files = null; 
try{ 
files = new File(path).listFiles(); 
} 
catch(Exception e){ 
files = null; 
} 
if(files==null){ 
// 访问出错 
Toast.makeText(getContext(), sOnErrorMsg,Toast.LENGTH_SHORT).show(); 
return -1; 
} 
if(list != null){ 
list.clear(); 
} 
else{ 
list = new ArrayList<Map<String, Object>>(files.length); 
} 

// 用来先保存文件夹和文件夹的两个列表 
ArrayList<Map<String, Object>> lfolders = new ArrayList<Map<String, Object>>(); 
ArrayList<Map<String, Object>> lfiles = new ArrayList<Map<String, Object>>(); 

if(!this.path.equals(sRoot)){ 
// 添加根目录 和 上一层目录 
Map<String, Object> map = new HashMap<String, Object>(); 
map.put("name", sRoot); 
map.put("path", sRoot); 
map.put("img", getImageId(sRoot)); 
list.add(map); 

map = new HashMap<String, Object>(); 
map.put("name", sParent); 
map.put("path", path); 
map.put("img", getImageId(sParent)); 
list.add(map); 
} 

for(File file: files) 
{ 
if(file.isDirectory() && file.listFiles()!=null){ 
// 添加文件夹 
Map<String, Object> map = new HashMap<String, Object>(); 
map.put("name", file.getName()); 
map.put("path", file.getPath()); 
map.put("img", getImageId(sFolder)); 
lfolders.add(map); 
} 
else if(file.isFile()){ 
// 添加文件 
String sf = getSuffix(file.getName()).toLowerCase(); 
if(suffix == null || suffix.length()==0 || (sf.length()>0 && suffix.indexOf("."+sf+";")>=0)){
Map<String, Object> map = new HashMap<String, Object>(); 
map.put("name", file.getName()); 
map.put("path", file.getPath()); 
map.put("img", getImageId(sf)); 
lfiles.add(map); 
} 
} 
} 

list.addAll(lfolders); // 先添加文件夹，确保文件夹显示在上面 
list.addAll(lfiles); //再添加文件 


SimpleAdapter adapter = new SimpleAdapter(getContext(), list, R.layout.filedialogitem, new String[]{"img", "name", "path"}, new int[]{R.id.filedialogitem_img, R.id.filedialogitem_name, R.id.filedialogitem_path});
this.setAdapter(adapter); 
return files.length; 
} 
@Override 
public void onItemClick(AdapterView<?> parent, View v, int position, long id) { 
// 条目选择 
String pt = (String) list.get(position).get("path"); 
String fn = (String) list.get(position).get("name"); 
if(fn.equals(sRoot) || fn.equals(sParent)){ 
// 如果是更目录或者上一层 
File fl = new File(pt); 
String ppt = fl.getParent(); 
if(ppt != null){ 
// 返回上一层 
path = ppt; 
} 
else{ 
// 返回更目录 
path = sRoot; 
} 
} 
else{ 
File fl = new File(pt); 
if(fl.isFile()){ 
// 如果是文件 
((Activity)getContext()).dismissDialog(this.dialogid); // 让文件夹对话框消失 

// 设置回调的返回值 
Bundle bundle = new Bundle(); 
bundle.putString("path", pt); 
bundle.putString("name", fn); 
// 调用事先设置的回调函数 
this.callback.callback(bundle); 
return; 
} 
else if(fl.isDirectory()){ 
// 如果是文件夹 
// 那么进入选中的文件夹 
path = pt; 
} 
} 
this.refreshFileList(); 
} 
} 
} 

然后 MainActivity使用：

showDialog(openfileDialogId);

重写Dialog：

@Override 
protected Dialog onCreateDialog(int id) { 
if(id==openfileDialogId){ 
Map<String, Integer> images = new HashMap<String, Integer>(); 
// 下面几句设置各文件类型的图标， 需要你先把图标添加到资源文件夹 
images.put(OpenFileDialog.sRoot, R.drawable.filedialog_root); // 根目录图标 
images.put(OpenFileDialog.sParent, R.drawable.filedialog_folder_up); //返回上一层的图标 
images.put(OpenFileDialog.sFolder, R.drawable.filedialog_folder); //文件夹图标 
images.put("doc", R.drawable.filedialog_file); //wav文件图标 
images.put(OpenFileDialog.sEmpty, R.drawable.filedialog_file); 
Dialog dialog = OpenFileDialog.createDialog(id, this, "打开文件", new CallbackBundle() {
@Override 
public void callback(Bundle bundle) {

String filepath = bundle.getString("path");
setTitle(filepath); // 把文件路径显示在标题上 
mlistInfo.add(filepath); //将新的info对象加入到信息列表中 
refreshList();

} 
}, 
null/*".doc;"*/, //文件后缀选择
images); 
return dialog; 
} 
return null; 
} 

以及回调处理：

// filename: CallbackBundle.java
package com.trimps.utils;

import android.os.Bundle;
// 简单的Bundle参数回调接口
public interface CallbackBundle {
abstract void callback(Bundle bundle);
}

=====================

更新LIstView函数：

private void refreshList(){
ListViewAdapter lvA = new ListViewAdapter(MainActivity.this.getApplicationContext(),mlistInfo);
lvAttch.setAdapter(lvA); 

//处理Item的点击事件 
lvAttch.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {

//Toast显示测试 
Toast.makeText(MainActivity.this, "hahaha",Toast.LENGTH_SHORT).show(); 
} 
});

//长按菜单显示 
lvAttch.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu conMenu, View view , ContextMenuInfo info) {
conMenu.setHeaderTitle("选项"); 
conMenu.add(0, 0, 0, "删除"); 

}
}); 

} 
//长按菜单处理函数 
public boolean onContextItemSelected(MenuItem aItem) { 
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)aItem.getMenuInfo();
switch (aItem.getItemId()) { 
case 0: 

mlistInfo.remove(aItem.getItemId());
refreshList();
return true; 

} 
return false; 
} 

最后ListViewAdapter适配类：

package com.trimps.utils;

import java.util.ArrayList;
import com.trimps.mobileoffice.R;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;


public class ListViewAdapter extends BaseAdapter {
private Context context;
private ArrayList<String> list = new ArrayList<String>();

public ListViewAdapter(Context context,ArrayList<String> list){
this.context = context;
this.list = list;
}

@Override
public int getCount() {
return list.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View view, ViewGroup parent) { 

String itemText = list.get(position);
ItemObj ioj = null;
if(view==null){
ioj = new ItemObj();
view = LayoutInflater.from(context).inflate(R.layout.mylistitem, parent, false);
ioj.name = (TextView)view.findViewById(R.id.info);

view.setTag(ioj);
}else{
ioj = (ItemObj)view.getTag();
} 
ioj.name.setText(itemText);

return view;

}

class ItemObj{
ImageView pic;
TextView name;
}
}