create a list of directories with theirhoto count

app/src/main/java/gallery/simplemobiletools/com/Directory.java

@@ -0,0 +1,25 @@
+package gallery.simplemobiletools.com;
+
+public class Directory {
+    private final String path;
+    private final String name;
+    private final int photoCnt;
+
+    public Directory(String path, String name, int photoCnt) {
+        this.path = path;
+        this.name = name;
+        this.photoCnt = photoCnt;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getPhotoCnt() {
+        return photoCnt;
+    }
+}

app/src/main/java/gallery/simplemobiletools/com/MainActivity.java

@@ -1,32 +1,55 @@
 package gallery.simplemobiletools.com;
 
-import android.content.ContentResolver;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.MediaStore;
 import android.support.v7.app.AppCompatActivity;
 
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 public class MainActivity extends AppCompatActivity {
+    private List<Directory> dirs;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        getImages();
+
+        Map<String, Integer> directories = getImages();
+        dirs = new ArrayList<>(directories.size());
+
+        for (Map.Entry<String, Integer> dir : directories.entrySet()) {
+            final String path = dir.getKey();
+            final String name = path.substring(path.lastIndexOf("/") + 1);
+            final int cnt = dir.getValue();
+            dirs.add(new Directory(path, name, cnt));
+        }
     }
 
-    private void getImages() {
-        final ContentResolver contentResolver = getContentResolver();
+    private Map<String, Integer> getImages() {
+        Map<String, Integer> dirs = new HashMap<>();
         final Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
-        final Cursor cursor = contentResolver.query(uri, null, null, null, null);
+        final Cursor cursor = getContentResolver().query(uri, null, null, null, null);
 
         if (cursor != null && cursor.moveToFirst()) {
             final int pathIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
             do {
-                final String path = cursor.getString(pathIndex);
+                final File file = new File(cursor.getString(pathIndex));
+                final String path = file.getParent().toLowerCase();
+                if (dirs.containsKey(path)) {
+                    dirs.put(path, dirs.get(path) + 1);
+                } else {
+                    dirs.put(path, 1);
+                }
             } while (cursor.moveToNext());
             cursor.close();
         }
+
+        return dirs;
     }
 }