如何实现文件选择器android 11答案

【问题标题】：How to implement file picker android 11如何实现文件选择器android 11
【发布时间】：2021-09-20 06:17:59
【问题描述】：

任何人都可以分享 Android 11 中用于内部和外部存储的文件选择器的完整解决方案

【问题讨论】：

试试这个：github.com/anggrayudi/SimpleStorage

【解决方案1】：

您可以使用 SAF（存储访问框架）选择文件

对于单个文件

// Request code for selecting a PDF document.
const val PICK_PDF_FILE = 2

fun openFile(pickerInitialUri: Uri) {
    val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
        addCategory(Intent.CATEGORY_OPENABLE)
        type = "application/pdf"

您也可以使用 SAF 打开目录

fun openDirectory(pickerInitialUri: Uri) {
    // Choose a directory using the system's file picker.
    val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE).apply {
        // Optionally, specify a URI for the directory that should be opened in
        // the system file picker when it loads.
        putExtra(DocumentsContract.EXTRA_INITIAL_URI, pickerInitialUri)
    }

    startActivityForResult(intent, your-request-code)
}
    
            // Optionally, specify a URI for the file that should appear in the
            // system file picker when it loads.
            putExtra(DocumentsContract.EXTRA_INITIAL_URI, pickerInitialUri)
        }
    
        startActivityForResult(intent, PICK_PDF_FILE)
    }

像这样获取文件的 URI

override fun onActivityResult(
        requestCode: Int, resultCode: Int, resultData: Intent?) {
    if (requestCode == your-request-code
            && resultCode == Activity.RESULT_OK) {
        // The result data contains a URI for the document or directory that
        // the user selected.
        resultData?.data?.also { uri ->
            // Perform operations on the document using its URI.
        }
    }
}

【讨论】：

【解决方案2】：

**For Single File**
// Request code for selecting a PDF document.
const val PICK_PDF_FILE = 2

fun openFile(pickerInitialUri: Uri) {
    val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
        addCategory(Intent.CATEGORY_OPENABLE)
        type = "application/pdf"

【讨论】：

正如目前所写，您的答案尚不清楚。请edit 添加其他详细信息，以帮助其他人了解这如何解决所提出的问题。你可以找到更多关于如何写好答案的信息in the help center。

【解决方案3】：

这里是使用 Intent 上传 Android 11 文件的代码，而且您不必在 AndroidManifest.xml 文件中提及 MANAGE_EXTERNAL_STORAGE 权限，我在没有此权限的情况下实现了。

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                    Intent chooseFile = new Intent(Intent.ACTION_GET_CONTENT);
                    chooseFile.setType("application/pdf");
                    chooseFile = Intent.createChooser(chooseFile, "Choose a file");
                    startActivityForResult(chooseFile, Constants.REQUEST_PICK_FILE);
                }else{
String[] types = new String[]{"pdf"};
    FilePickerBuilder.getInstance().setMaxCount(UPLOAD_LIMIT - attachmentModelList.size())
            .setActivityTheme(R.style.AppTheme)
            .setActivityTitle(mActivity.getString(R.string.select_documents))
            /*.sortDocumentsBy(SortingTypes.NAME)*/
            .enableDocSupport(false)
            .addFileSupport("PDF", types)
            /*.setSelectedFiles(masterList !!)*/
            .pickFile(this);
}

这里是onActivityResult Code Pick File Name等信息

    if (requestCode == Constants.REQUEST_PICK_FILE &&
                        resultCode == Activity.RESULT_OK) {
    
                    Uri uri = data.getData();
                    String mimeType = getActivity().getContentResolver().getType(uri);
                    String filename;
                    if (mimeType == null) {
                        String path = CommonMethod.getPath(getActivity(), uri);
    //                    if (path == null) {
    //                        filename = FilenameUtils.getName(uri.toString());
    //                    } else {
                        File file = new File(path);
                        filename = file.getName();
    //                    }
                    } else {
                        Uri returnUri = data.getData();
                        Cursor returnCursor = getActivity().getContentResolver().query(returnUri, null, null, null, null);
                        int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
                        int sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE);
                        returnCursor.moveToFirst();
                        filename = returnCursor.getString(nameIndex);
                        String size = Long.toString(returnCursor.getLong(sizeIndex));
                    }
                    File fileSave = getActivity().getExternalFilesDir(null);
                    String sourcePath = getActivity().getExternalFilesDir(null).toString();
                    File targetFile = null;
                    try {
                        targetFile = new File(sourcePath + "/" + filename);
                        boolean success = CommonMethod.copyFileStream(new File(sourcePath + "/" + filename), uri, getActivity());
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    if (targetFile != null) {
                        String fileName = Utils.getFileName(getActivity(),Uri.fromFile(targetFile));
 String filePath = targetFile.getPath();
    
                       
                }

【讨论】：