android调用系统文件选择文件

在app中用户选择u盘或者设备中的某个文件，在成功中获取该文件的路径

1.打开系统文件夹

binding.test.setOnClickListener {//调用系统文件夹val intent = Intent(Intent.ACTION_GET_CONTENT)intent.type = "*/*" // /*/ 此处是任意类型任意后缀//intent.setType(“audio/*”) //选择音频//intent.setType(“video/*”) //选择视频 （mp4 3gp 是android支持的视频格式）//intent.setType(“video/*;image/*”)//同时选择视频和图片intent.addCategory(Intent.CATEGORY_OPENABLE)startActivityForResult(intent, 100)}

2.回调

选择了文件之后会在onAcivityResult中回调

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {super.onActivityResult(requestCode, resultCode, data)//没选择文件直接返回if (resultCode != Activity.RESULT_OK || requestCode != 100) returnval uri = data?.data ?: returnif ("file" == uri.scheme.lowercase()) {val path = uri.pathbinding.tvPath.text = pathLog.e("DeviceFirmwareUpdateActivity", "file:// $path")} else {val path = FilePathRequest().getPath(this, uri)binding.tvPath.text = pathLog.e("DeviceFirmwareUpdateActivity", "other:// $path")// 如果上面路径为空，则可能是从U盘里找的if (binding.tvPath.text.toString() == "") {var name = uri.pathif (name.startsWith("/document/")) {name = name.replace("/document/", "/storage/")binding.tvPath.text = name.replace(":", "/")}}}}

3.效果图

4.获取文件绝对路径方法

@SuppressLint("NewApi")public String getPath(final Context context, final Uri uri) {final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;// DocumentProviderif (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {// ExternalStorageProviderif (isExternalStorageDocument(uri)) {final String docId = DocumentsContract.getDocumentId(uri);final String[] split = docId.split(":");final String type = split[0];if ("primary".equalsIgnoreCase(type)) {return Environment.getExternalStorageDirectory() + "/" + split[1];}}// DownloadsProviderelse if (isDownloadsDocument(uri)) {final String id = DocumentsContract.getDocumentId(uri);final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));return getDataColumn(context, contentUri, null, null);}// MediaProviderelse if (isMediaDocument(uri)) {final String docId = DocumentsContract.getDocumentId(uri);final String[] split = docId.split(":");final String type = split[0];Uri contentUri = null;if ("image".equals(type)) {contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;} else if ("video".equals(type)) {contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;} else if ("audio".equals(type)) {contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;}final String selection = "_id=?";final String[] selectionArgs = new String[]{split[1]};return getDataColumn(context, contentUri, selection, selectionArgs);}}// MediaStore (and general)else if ("content".equalsIgnoreCase(uri.getScheme())) {return getDataColumn(context, uri, null, null);}// Fileelse if ("file".equalsIgnoreCase(uri.getScheme())) {return uri.getPath();}return null;}/*** Get the value of the data column for this Uri. This is useful for* MediaStore Uris, and other file-based ContentProviders.** @param context The context.* @param uri The Uri to query.* @param selection(Optional) Filter used in the query.* @param selectionArgs (Optional) Selection arguments used in the query.* @return The value of the _data column, which is typically a file path.*/public String getDataColumn(Context context, Uri uri, String selection,String[] selectionArgs) {Cursor cursor = null;final String column = "_data";final String[] projection = {column};try {cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,null);if (cursor != null && cursor.moveToFirst()) {final int column_index = cursor.getColumnIndexOrThrow(column);return cursor.getString(column_index);}} finally {if (cursor != null)cursor.close();}return null;}/*** @param uri The Uri to check.* @return Whether the Uri authority is ExternalStorageProvider.*/public boolean isExternalStorageDocument(Uri uri) {return "com.android.externalstorage.documents".equals(uri.getAuthority());}/*** @param uri The Uri to check.* @return Whether the Uri authority is DownloadsProvider.*/public boolean isDownloadsDocument(Uri uri) {return "com.android.providers.downloads.documents".equals(uri.getAuthority());}/*** @param uri The Uri to check.* @return Whether the Uri authority is MediaProvider.*/public boolean isMediaDocument(Uri uri) {return "com.android.providers.media.documents".equals(uri.getAuthority());}