java - 如何在 Android 中打开 Intent Chooser 来浏览 Sdcard 文件夹及其内容

Question

我正在尝试附加位于 Sdcard 中某个文件夹中的文件。我可以从图库和其他媒体类型中获取文件，但到目前为止还没有浏览 SD 卡，所以我可以选择文本文件(Doc、docx、pdf 等)。该要求与Android设备的Email-Application中的Email-attach菜单选项非常接近，该选项允许用户通过Intent查看Sdcard文件夹。

如果有人有这样的浏览SD卡及其内容的经验，请分享代码或指导我。提前谢谢了。

最近我使用以下代码打开但它没有显示 Sdcard 选项`:-

Uri startDir = Uri.fromFile(new File(Environment.getExternalStorageDirectory()
            .getAbsolutePath()));
        Intent intent = new Intent();
        intent.setData(startDir);
        intent.setType("*/*");
        intent.setAction(Intent.ACTION_VIEW);
        startActivity(intent);

Answer 1

试试这个...

          public OnClickListener buttonOnClickBrowse = new OnClickListener() {

    @Override
    public void onClick(View v)
        {
                loadFileList();

               showDialog(DIALOG_LOAD_FILE);

        }
};

//*************************************

ArrayList<String> str = new ArrayList<String>();

// Check if the first level of the directory structure is the one showing
private Boolean firstLvl = true;

private Item [] fileList;
private File path = new File(Environment.getExternalStorageDirectory() + "");
private String chosenFile;
private static final int DIALOG_LOAD_FILE = 1000;

ArrayAdapter adapter1;

private void loadFileList()
    {
        try
            {
                path.mkdirs();
            } catch (SecurityException e)
            {
                Log.e(TAG , "unable to write on the sd card ");
            }

        // Checks whether path exists
        if (path.exists())
            {
                FilenameFilter filter = new FilenameFilter() {
                    @Override
                    public boolean accept(File dir , String filename)
                        {
                            File sel = new File(dir , filename);
                            // Filters based on whether the file is hidden
                            // or not
                            return (sel.isFile() || sel.isDirectory()) && !sel.isHidden();

                        }
                };

                String [] fList = path.list(filter);
                fileList = new Item[fList.length];
                for (int i = 0; i < fList.length; i++)
                    {
                        fileList [i] = new Item(fList [i] , R.drawable.file_icon);

                        // Convert into file path
                        File sel = new File(path , fList [i]);

                        // Set drawables
                        if (sel.isDirectory())
                            {
                                fileList [i].icon = R.drawable.directory_icon;
                                Log.d("DIRECTORY" , fileList [i].file);
                            } else
                            {
                                Log.d("FILE" , fileList [i].file);
                            }
                    }

                if (!firstLvl)
                    {
                        Item temp[] = new Item[fileList.length + 1];
                        for (int i = 0; i < fileList.length; i++)
                            {
                                temp [i + 1] = fileList [i];
                            }
                        temp [0] = new Item("Up" , R.drawable.directory_up);
                        fileList = temp;
                    }
            } else
            {
                Log.e(TAG , "path does not exist");
            }

        adapter1 = new ArrayAdapter<Item>(ImageReader.this , android.R.layout.select_dialog_item , android.R.id.text1 , fileList) {
            @Override
            public View getView(int position , View convertView , ViewGroup parent)
                {

                    View view = super.getView(position , convertView , parent);
                    TextView textView = (TextView) view.findViewById(android.R.id.text1);

                    // put the image on the text view
                    textView.setCompoundDrawablesWithIntrinsicBounds(fileList [position].icon , 0 , 0 , 0);

                    // add margin between image and text (support various
                    // screen
                    // densities)
                    int dp5 = (int) (5 * getResources().getDisplayMetrics().density + 0.5f);
                    textView.setCompoundDrawablePadding(dp5);

                    return view;

                }
        };

    }

private class Item {
    public String file;
    public int icon;

    public Item(String file , Integer icon) {
        this.file = file;
        this.icon = icon;
    }

    @Override
    public String toString()
        {
            return file;
        }
}

File setetedFileName;

@Override
protected Dialog onCreateDialog(int id)
    {
        Dialog dialog = null;
        AlertDialog.Builder builder = new Builder(this);

        if (fileList == null)
            {
                Log.e(TAG , "No files loaded");
                dialog = builder.create();
                return dialog;
            }

        switch (id) {
            case DIALOG_LOAD_FILE:
                builder.setTitle("choose ur file");
                builder.setAdapter(adapter1 , new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog , int which)
                        {
                            chosenFile = fileList [which].file;
                            File sel = new File(path + "/" + chosenFile);
                            setetedFileName = sel;
                            if (sel.isDirectory())
                                {
                                    firstLvl = false;

                                    // Adds chosen directory to list
                                    str.add(chosenFile);
                                    fileList = null;
                                    path = new File(sel + "");

                                    loadFileList();

                                    removeDialog(DIALOG_LOAD_FILE);
                                    showDialog(DIALOG_LOAD_FILE);
                                    Log.d(TAG , path.getAbsolutePath());

                                }

                            // Checks if 'up' was clicked
                            else if (chosenFile.equalsIgnoreCase("up") && !sel.exists())
                                {

                                    // present directory removed from list
                                    String s = str.remove(str.size() - 1);

                                    // path modified to exclude present
                                    // directory
                                    path = new File(path.toString().substring(0 , path.toString().lastIndexOf(s)));
                                    fileList = null;

                                    // if there are no more directories in
                                    // the list, then
                                    // its the first level
                                    if (str.isEmpty())
                                        {
                                            firstLvl = true;
                                        }
                                    loadFileList();

                                    removeDialog(DIALOG_LOAD_FILE);
                                    showDialog(DIALOG_LOAD_FILE);
                                    Log.d(TAG , path.getAbsolutePath());

                                }
                            // File picked
                            else
                                {
                                    // Perform action with file picked

                                    Toast.makeText(getApplicationContext() , "" + setetedFileName.getAbsolutePath() , Toast.LENGTH_SHORT).show();



                                }

                        }
                });
                break;
        }
        dialog = builder.show();
        return dialog;
    }

         // *******************************************************************