change the package name to com.simplemobiletools.gallery

- no real functionality change

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

@@ -0,0 +1,75 @@
+package com.simplemobiletools.gallery.activities;
+
+import android.content.Intent;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Bundle;
+import android.provider.MediaStore;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.GridView;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.simplemobiletools.gallery.Constants;
+import com.simplemobiletools.gallery.Directory;
+import com.simplemobiletools.gallery.R;
+import com.simplemobiletools.gallery.adapters.DirectoryAdapter;
+
+public class MainActivity extends AppCompatActivity implements OnItemClickListener {
+    private List<Directory> dirs;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        final GridView gridView = (GridView) findViewById(R.id.directories_grid);
+
+        dirs = new ArrayList<>(getDirectories().values());
+        final DirectoryAdapter adapter = new DirectoryAdapter(this, dirs);
+        gridView.setAdapter(adapter);
+        gridView.setOnItemClickListener(this);
+    }
+
+    private Map<String, Directory> getDirectories() {
+        final Map<String, Directory> directories = new LinkedHashMap<>();
+        final Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
+        final String[] columns = {MediaStore.Images.Media.DATA};
+        final String order = MediaStore.Images.Media.DATE_MODIFIED + " DESC";
+        final Cursor cursor = getContentResolver().query(uri, columns, null, null, order);
+
+        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(path);
+                final String fileDir = file.getParent().toLowerCase();
+
+                if (directories.containsKey(fileDir)) {
+                    final Directory directory = directories.get(fileDir);
+                    final int newImageCnt = directory.getPhotoCnt() + 1;
+                    directory.setPhotoCnt(newImageCnt);
+                } else {
+                    final String dirName = fileDir.substring(fileDir.lastIndexOf("/") + 1);
+                    directories.put(fileDir, new Directory(fileDir, path, dirName, 1));
+                }
+            } while (cursor.moveToNext());
+            cursor.close();
+        }
+
+        return directories;
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        final Intent intent = new Intent(this, PhotosActivity.class);
+        intent.putExtra(Constants.DIRECTORY, dirs.get(position).getPath());
+        startActivity(intent);
+    }
+}