Image-to-pdf: Filename InputField is autofilled with the filename

app/src/main/java/swati4star/createpdf/fragment/ImageToPdfFragment.java

@@ -96,6 +96,7 @@
 import static swati4star.createpdf.util.DialogUtils.createCustomDialog;
 import static swati4star.createpdf.util.DialogUtils.createCustomDialogWithoutContent;
 import static swati4star.createpdf.util.DialogUtils.createOverwriteDialog;
+import static swati4star.createpdf.util.FileUtils.getFileNameWithoutExtension;
 import static swati4star.createpdf.util.ImageEnhancementOptionsUtils.getEnhancementOptions;
 import static swati4star.createpdf.util.ImageUtils.mImageScaleType;
 import static swati4star.createpdf.util.ImageUtils.showImageScaleTypeDialog;
@@ -262,9 +263,11 @@ void createPdf(boolean isgrayScale) {
         mPdfOptions.setMasterPwd(mSharedPreferences.getString(MASTER_PWD_STRING, appName));
         mPdfOptions.setPageColor(mPageColor);
 
+        String preFillName = mFileUtils.getLastFileName(mImagesUri);
+
         MaterialDialog.Builder builder = createCustomDialog(mActivity,
                 R.string.creating_pdf, R.string.enter_file_name);
-        builder.input(getString(R.string.example), null, (dialog, input) -> {
+        builder.input(getString(R.string.example), preFillName, (dialog, input) -> {
             if (StringUtils.isEmpty(input)) {
                 showSnackbar(mActivity, R.string.snackbar_name_not_blank);
             } else {

app/src/main/java/swati4star/createpdf/util/FileUtils.java

@@ -342,6 +342,39 @@ public static String getFileDirectoryPath(String path) {
         return path.substring(0, path.lastIndexOf(PATH_SEPERATOR) + 1);
     }
 
+    /**
+     * Returns name of the last file with "_pdf" suffix.
+     * @param filesPath - ArrayList of image paths
+     * @return fileName with _pdf suffix
+     */
+    public String getLastFileName(ArrayList<String> filesPath) {
+
+        if (filesPath.size() == 0)
+            return "";
+        String lastSelectedFilePath = filesPath.get(filesPath.size() - 1);
+        String nameWithoutExt = stripExtension(getFileNameWithoutExtension(lastSelectedFilePath));
+        return nameWithoutExt + mContext.getString(swati4star.createpdf.R.string.pdf_suffix);
+    }
+
+    /**
+     * Returns the filename without its extension
+     * @param fileNameWithExt fileName with extension. Ex: androidDev.jpg
+     * @return fileName without extension. Ex: androidDev
+     */
+    private String stripExtension(String fileNameWithExt) {
+        // Handle null case specially.
+        if (fileNameWithExt == null) return null;
+
+        // Get position of last '.'.
+        int pos = fileNameWithExt.lastIndexOf(".");
+
+        // If there wasn't any '.' just return the string as is.
+        if (pos == -1) return fileNameWithExt;
+
+        // Otherwise return the string, up to the dot.
+        return fileNameWithExt.substring(0, pos);
+    }
+
     /**
      * Saves bitmap to external storage
      * @param filename - name of the file

app/src/main/res/values/strings.xml

@@ -522,4 +522,7 @@
     <string name="no_excel_file">No excel file selected</string>
     <string name="split_range_alert">Entered split range will create Selected PDF again!</string>
 
+    <!--file name suffix-->
+    <string name="pdf_suffix" translatable="false">_pdf</string>
+
 </resources>