In the Phimpme Android application, users can perform various operations on images such as editing an image, sharing an image, printing a pdf version of the image and many more. However, another important functionality that has been implemented is the option to move an image from one path(folder) to another. So in this blog post, I will be discussing how we achieved the functionality to move any image.
Step 1
First, we need to add an option in the overflow menu to move any no of images from one folder to another. The option to move an image has been added by implementing the following lines of code in the menu_view_pager.xml file.
| <item android:id=“@+id/action_move” app:showAsAction=“never” android:title=“Move”/> |
Step 2
Now after the user opts for the move operation, a bottomSheetDialog containing all the albums/folders in the storage to choose for moving the photos into will be displayed. Once the user selects the required location to move the photos to, a method moveSelectedMedia would be invoked passing-in the context and the destination path as the parameters. Thereafter inside the method moveSelectedMedia, first a check would be performed to determine whether the selected photos(to move) are already present in the folder(path folder and destination folder both are same), if true the operation would be terminated as the photos are already present in the destination folder, and if false the selected photos would be moved to the destination folder one by one by the use of another method moveMedia. The code snippets used to implement the moveSelectedMedia is provided below.
| public int moveSelectedMedia(Context context, String targetDir) { int n = 0; try { int index=-1; for(int i =0;i<selectedMedias.size();i++) { String s = selectedMedias.get(i).getPath(); int indexOfLastSlash = s.lastIndexOf(“/”); String fileName = s.substring(indexOfLastSlash + 1); if(!selectedMedias.get(i).getPath().equals(targetDir+“/”+fileName)){ index=-1; }else{ index=i; break; } } if(index!=-1) { n = –1; }else{ for (int i = 0; i < selectedMedias.size(); i++) { if (moveMedia(context, selectedMedias.get(i).getPath(), targetDir)) { String from = selectedMedias.get(i).getPath(); scanFile(context, new String[]{ from, StringUtils.getPhotoPathMoved(selectedMedias.get(i).getPath(), targetDir) }, new MediaScannerConnection.OnScanCompletedListener() { @Override public void onScanCompleted(String s, Uri uri) { Log.d(“scanFile”, “onScanCompleted: “ + s); } }); media.remove(selectedMedias.get(i)); n++; } } setCount(media.size()); } } catch (Exception e) { e.printStackTrace(); } return n; } |
Step 3
In this step, I’d discuss the use and implementation of the moveMedia method mentioned in the earlier step. So the moveMedia is used to move a single photo to a particular destination, taking-in the context, the oldpath of the photo and the destination folder as parameters. Inside this method another method moveFile of the ContentHelper class is invoked passing-in the context, File object of the photo and File object of the destination folder as parameters. Now inside the moveFile method the actual move operation takes place. First the photo is tried to move by doing a normal rename operation by using the renameTo function of the File class. The success of the rename operation updates the path of the photo to the destination path and deletes the original path of the photo whereas if the normal rename operation fails, then the photo is moved by first performing a copy operation to copy the photo to the destination folder and then deleting the original photo. The code snippets used to implement the moveMedia and moveFile functions are provided below.
| private boolean moveMedia(Context context, String source, String targetDir) { File from = new File(source); File to = new File(targetDir); return ContentHelper.moveFile(context, from, to); } |
| public static boolean moveFile(Context context, @NonNull final File source, @NonNull final File targetDir) { // First try the normal rename. File target = new File(targetDir, source.getName()); boolean success = source.renameTo(target); if (!success) { success = copyFile(context, source, targetDir); if (success) { success = deleteFile(context, source); } } //if (success) scanFile(context, new String[]{ source.getPath(), target.getPath() }); return success; } |
And at last, after the photos are moved successfully the media adapter is called with the updated photos list to display thus displaying the remaining photos in the folder.
This is how we have implemented the functionality to move images from one path to another in the Phimpme Android application. To get the full source code, please refer to the Phimpme Android Github repository listed in the resource section below.
Resources
1. Android Developer documentation – https://developer.android.com/reference/java/io/File
2. Github-Phimpme Android Repository – https://github.com/fossasia/phimpme- android/
3. Renaming a file in java – http://stacktips.com/tutorials/java/how-to-delete-and-rename-a-file-in-java