Android调用系统自带的文件管理器，打开指定路径

系统管理员 2022-05-16 12:47 342阅读 0赞

一、打开系统自带的文件管理器

if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                showToast(R.string.msg_storage_nosdcard);
                return;
            }
            //获取文件下载路径
            String compName = AppString.getCompanyName();
            String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + compName + "/OSC_DATA/";
            File dir = new File(path);
            if (!dir.exists()) {
                dir.mkdirs();
            }
            //调用系统文件管理器打开指定路径目录
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.setDataAndType(Uri.fromFile(dir.getParentFile()), "file/*.txt");
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            startActivityForResult(intent, REQUEST_CHOOSEFILE);

@Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data){//选择文件返回
            super.onActivityResult(requestCode,resultCode,data);
            if(resultCode==RESULT_OK){
            switch(requestCode){
                  case REQUEST_CHOOSEFILE:
                  Uri uri=data.getData();
                  chooseFilePath=FileChooseUtil.getInstance(this).getChooseFileResultPath(uri);
                 Log.d(TAG,"选择文件返回："+chooseFilePath);
                  sendFileMessage(chooseFilePath);
                  break;
            }
        }
    }

二、工具类FileChooseUtil

public class FileChooseUtil {
    
        private Context context;
        private static FileChooseUtil util = null;
    
        private FileChooseUtil(Context context) {
            this.context = context;
        }
    
        public static FileChooseUtil getInstance(Context context) {
            if (util == null) {
                util = new FileChooseUtil(context);
            }
            return util;
        }
    
        /**
         * 对外接口  获取uri对应的路径
         *
         * @param uri
         * @return
         */
        public String getChooseFileResultPath(Uri uri) {
            String chooseFilePath = null;
            if ("file".equalsIgnoreCase(uri.getScheme())) {//使用第三方应用打开
                chooseFilePath = uri.getPath();
                Toast.makeText(context, chooseFilePath, Toast.LENGTH_SHORT).show();
                return chooseFilePath;
            }
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT) {//4.4以后
                chooseFilePath = getPath(context, uri);
            } else {//4.4以下下系统调用方法
                chooseFilePath = getRealPathFromURI(uri);
            }
            return chooseFilePath;
        }
    
        private String getRealPathFromURI(Uri contentUri) {
            String res = null;
            String[] proj = {MediaStore.Images.Media.DATA};
            Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
            if (null != cursor && cursor.moveToFirst()) {
                int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                res = cursor.getString(column_index);
                cursor.close();
            }
            return res;
        }
    
        /**
         * 专为Android4.4设计的从Uri获取文件绝对路径，以前的方法已不好使
         */
        @SuppressLint("NewApi")
        private String getPath(final Context context, final Uri uri) {
    
            final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
    
            // DocumentProvider
            if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
                // ExternalStorageProvider
                if (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];
    
                    }
                }
                // DownloadsProvider
                else 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);
    
                }
                // MediaProvider
                else 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);
    
            }
            // File
            else if ("file".equalsIgnoreCase(uri.getScheme())) {
                uri.getPath();
    
            }
            return null;
        }
    
        private 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.
         */
        private 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.
         */
        private 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.
         */
        private boolean isMediaDocument(Uri uri) {
            return "com.android.providers.media.documents".equals(uri.getAuthority());
        }
    }

完！！！