Android 打开对话框

 https://blog.youkuaiyun.com/trbbadboy/article/details/7899424 和 https://blog.youkuaiyun.com/yuanyuan_186/article/details/40709901 的博客中都是用了 Activity的onCreateDialog 及dialogID

而本文的原则:  舍弃使用 Activity的onCreateDialog 及dialogID；setDlg的方式，直接dlg.dimiss实现。

public class OpenFileDialog {
	public static String tag = "OpenFileDialog";
	static final public String sRoot = "/sdcard";
	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
	// 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(Context context, String title, CallbackBundle callback, String suffix, Map<String, Integer> images){
	    AlertDialog.Builder builder = new AlertDialog.Builder(context);

        FileSelectView fv = new FileSelectView(context, callback, suffix, images);
		builder.setView(fv);

        Dialog dialog = builder.create();
		//dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        fv.setDlg(dialog);

		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;

		Dialog  dlg = null;
		private String suffix = null;
		
		private Map<String, Integer> imagemap = null;
		
		public FileSelectView(Context context,  CallbackBundle callback, String suffix, Map<String, Integer> images) {
			super(context);
			this.imagemap = images;
			this.suffix = suffix==null?"":suffix.toLowerCase();
			this.callback = callback;

			this.setOnItemClickListener(this);
			refreshFileList();
		}

		public void setDlg(Dialog dialog){
            dlg = dialog;
        }
		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
					if(dlg != null) {
                        dlg.dismiss();
                    }

					// 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();
		}
	}
}

res/layout xml 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/vw1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#000000"
    android:orientation="horizontal"
    android:padding="4dp" >

    <ImageView
        android:id="@+id/filedialogitem_img"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_margin="4dp"/>

   <LinearLayout
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:orientation="vertical" >

        <TextView
            android:id="@+id/filedialogitem_name"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textColor="#FFFFFF"
            android:textSize="18sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/filedialogitem_path"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            android:textColor="#FFFFFF"
            android:textSize="14sp" />

    </LinearLayout>

</LinearLayout>