filter files and folders by a file extension

build.gradle

@@ -11,8 +11,6 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.3'
-        classpath 'com.novoda:bintray-release:0.3.4'
     }
 }
 

library/build.gradle

@@ -6,7 +6,7 @@ apply plugin: 'com.android.library'
  */
 
 // must be applied after your artifact generating plugin (eg. java /  com.android.library)
-apply plugin: 'bintray-release'
+//apply plugin: 'bintray-release'
 
 // query git for the the SHA, Tag and commit count. Use these to automate versioning.
 def gitTag = 'git describe --tags'.execute([], project.rootDir).text.trim()
@@ -34,14 +34,4 @@ dependencies {
     testCompile 'junit:junit:4.12'
 }
 
-publish {
-    groupId = 'com.nononsenseapps'
-    artifactId = 'filepicker'
-    publishVersion = gitTag
-    description = 'An extendable Android file/directory-picker you can include in your app'
-    website = 'https://github.com/spacecowboy/NoNonsense-FilePicker'
-    licences = ['MPL-2.0']
-    uploadName = 'com.nononsenseapps:filepicker'
-    bintrayUser = project.hasProperty("BINTRAY_USER")? BINTRAY_USER: "Dummy"
-    bintrayKey = project.hasProperty("BINTRAY_KEY") ? BINTRAY_KEY: "Dummy"
-}
+

library/src/main/java/com/nononsenseapps/filepicker/FilePickerFragment.java

@@ -26,6 +26,8 @@ import java.io.File;
  */
 public class FilePickerFragment extends AbstractFilePickerFragment<File> {
 
+    private static final String[] extensions = new String[]{".doc", ".docx", ".xlsx", ".xls", ".png", ".jpg", ".tif", ".pdf", ".jpeg"};
+
     protected static final int PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE = 1;
     protected boolean showHiddenItems = false;
     private File mRequestedPath = null;
@@ -38,7 +40,7 @@ public class FilePickerFragment extends AbstractFilePickerFragment<File> {
      *
      * @param showHiddenItems whether hidden items should be shown or not
      */
-    public void showHiddenItems(boolean showHiddenItems){
+    public void showHiddenItems(boolean showHiddenItems) {
         this.showHiddenItems = showHiddenItems;
     }
 
@@ -48,7 +50,7 @@ public class FilePickerFragment extends AbstractFilePickerFragment<File> {
      * @return true if hidden items are shown, otherwise false
      */
 
-    public boolean areHiddenItemsShown(){
+    public boolean areHiddenItemsShown() {
         return showHiddenItems;
     }
 
@@ -237,7 +239,9 @@ public class FilePickerFragment extends AbstractFilePickerFragment<File> {
                 if (listFiles != null) {
                     for (java.io.File f : listFiles) {
                         if (isItemVisible(f)) {
-                            files.add(f);
+                            if ((f.isFile() && isNeededExtension(f.toString())) || (f.isDirectory() && directoryHasNeededFiles(f))) {
+                                files.add(f);
+                            }
                         }
                     }
                 }
@@ -292,6 +296,39 @@ public class FilePickerFragment extends AbstractFilePickerFragment<File> {
         };
     }
 
+    private boolean directoryHasNeededFiles(@NonNull final File file) {
+        final File[] fileList = file.listFiles();
+        if (fileList == null) {
+            return isNeededExtension(file.toString());
+        }
+        if (fileList.length > 0) {
+            for (final File fileInDirectory : fileList) {
+                if (!isItemVisible(fileInDirectory)) {
+                    continue;
+                }
+                if (!fileInDirectory.isDirectory()) {
+                    if (isNeededExtension(fileInDirectory.toString())) {
+                        return true;
+                    }
+                } else {
+                    if (directoryHasNeededFiles(fileInDirectory)) {
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
+    private boolean isNeededExtension(@NonNull final String fileName) {
+        for (final String extension : extensions) {
+            if (fileName.endsWith(extension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     /**
      * Name is validated to be non-null, non-empty and not containing any
      * slashes.