open a new activity with photos on directory click

app/src/main/AndroidManifest.xml

@@ -20,5 +20,9 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+
+        <activity
+            android:name=".PhotosActivity"
+            android:screenOrientation="portrait"/>
     </application>
 </manifest>

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

@@ -0,0 +1,5 @@
+package gallery.simplemobiletools.com;
+
+public class Constants {
+    public static final String DIRECTORY = "directory";
+}

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

@@ -1,16 +1,22 @@
 package gallery.simplemobiletools.com;
 
 public class Directory {
+    private final String path;
     private final String thumbnail;
     private final String name;
     private int photoCnt;
 
-    public Directory(String thumbnail, String name, int photoCnt) {
+    public Directory(String path, String thumbnail, String name, int photoCnt) {
+        this.path = path;
         this.thumbnail = thumbnail;
         this.name = name;
         this.photoCnt = photoCnt;
     }
 
+    public String getPath() {
+        return path;
+    }
+
     public String getThumbnail() {
         return thumbnail;
     }

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

@@ -1,10 +1,14 @@
 package gallery.simplemobiletools.com;
 
+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;
@@ -13,7 +17,8 @@ import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
 
-public class MainActivity extends AppCompatActivity {
+public class MainActivity extends AppCompatActivity implements OnItemClickListener {
+    private List<Directory> dirs;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -21,9 +26,10 @@ public class MainActivity extends AppCompatActivity {
         setContentView(R.layout.activity_main);
         final GridView gridView = (GridView) findViewById(R.id.photo_grid);
 
-        final List<Directory> dirs = new ArrayList<>(getDirectories().values());
+        dirs = new ArrayList<>(getDirectories().values());
         final DirectoryAdapter adapter = new DirectoryAdapter(this, dirs);
         gridView.setAdapter(adapter);
+        gridView.setOnItemClickListener(this);
     }
 
     private Map<String, Directory> getDirectories() {
@@ -44,7 +50,7 @@ public class MainActivity extends AppCompatActivity {
                 } else {
                     final String thumbnail = file.getAbsolutePath();
                     final String dirName = fileDir.substring(fileDir.lastIndexOf("/") + 1);
-                    directories.put(fileDir, new Directory(thumbnail, dirName, 1));
+                    directories.put(fileDir, new Directory(fileDir, thumbnail, dirName, 1));
                 }
             } while (cursor.moveToNext());
             cursor.close();
@@ -52,4 +58,11 @@ public class MainActivity extends AppCompatActivity {
 
         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);
+    }
 }

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

@@ -0,0 +1,15 @@
+package gallery.simplemobiletools.com;
+
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+
+public class PhotosActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_photos);
+
+        final String path = getIntent().getStringExtra(Constants.DIRECTORY);
+    }
+}

app/src/main/res/layout/activity_photos.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/black">
+
+</RelativeLayout>