ANDROID中调用文件管理器并返回选中文件的路径

selectfile.java

    public String getRealPathFromURI(Uri contentUri) {
         String res = null;
         String[] proj = { MediaStore.Images.Media.DATA };
         Cursor cursor = 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")
     public 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())) {
             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());
     }
 }