create a grid of directories

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

@@ -3,9 +3,9 @@ package gallery.simplemobiletools.com;
 public class Directory {
     private final String path;
     private final String name;
-    private final int photoCnt;
+    private final String photoCnt;
 
-    public Directory(String path, String name, int photoCnt) {
+    public Directory(String path, String name, String photoCnt) {
         this.path = path;
         this.name = name;
         this.photoCnt = photoCnt;
@@ -19,7 +19,7 @@ public class Directory {
         return name;
     }
 
-    public int getPhotoCnt() {
+    public String getPhotoCnt() {
         return photoCnt;
     }
 }

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

@@ -0,0 +1,63 @@
+package gallery.simplemobiletools.com;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.TextView;
+
+import java.util.List;
+
+public class DirectoryAdapter extends BaseAdapter {
+    private final List<Directory> dirs;
+    private final LayoutInflater inflater;
+
+    public DirectoryAdapter(Context context, List<Directory> dirs) {
+        this.dirs = dirs;
+        this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+    }
+
+    @Override
+    public View getView(int position, View view, ViewGroup parent) {
+        ViewHolder holder;
+        if (view == null) {
+            view = inflater.inflate(R.layout.photo_item, parent, false);
+            holder = new ViewHolder(view);
+            view.setTag(holder);
+        } else {
+            holder = (ViewHolder) view.getTag();
+        }
+
+        Directory dir = dirs.get(position);
+        holder.dirName.setText(dir.getName());
+        holder.photoCnt.setText(dir.getPhotoCnt());
+
+        return view;
+    }
+
+    @Override
+    public int getCount() {
+        return dirs.size();
+    }
+
+    @Override
+    public Object getItem(int position) {
+        return dirs.get(position);
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return 0;
+    }
+
+    static class ViewHolder {
+        TextView dirName;
+        TextView photoCnt;
+
+        public ViewHolder(View view) {
+            dirName = (TextView) view.findViewById(R.id.dir_name);
+            photoCnt = (TextView) view.findViewById(R.id.photo_cnt);
+        }
+    }
+}

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

@@ -5,12 +5,14 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.provider.MediaStore;
 import android.support.v7.app.AppCompatActivity;
+import android.widget.GridView;
 
 import java.io.File;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.TreeMap;
 
 public class MainActivity extends AppCompatActivity {
     private List<Directory> dirs;
@@ -20,19 +22,23 @@ public class MainActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        Map<String, Integer> directories = getImages();
+        final 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();
+            final String cnt = String.valueOf(dir.getValue());
             dirs.add(new Directory(path, name, cnt));
         }
+
+        final GridView gridView = (GridView) findViewById(R.id.photo_grid);
+        DirectoryAdapter adapter = new DirectoryAdapter(this, dirs);
+        gridView.setAdapter(adapter);
     }
 
     private Map<String, Integer> getImages() {
-        Map<String, Integer> dirs = new HashMap<>();
+        final Map<String, Integer> dirs = new TreeMap<>();
         final Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
         final Cursor cursor = getContentResolver().query(uri, null, null, null, null);
 

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

@@ -0,0 +1,25 @@
+package gallery.simplemobiletools.com;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.widget.ImageView;
+
+public class MyImageView extends ImageView {
+    public MyImageView(Context context) {
+        super(context);
+    }
+
+    public MyImageView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public MyImageView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth());
+    }
+}

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

@@ -1,9 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
+    android:layout_height="match_parent">
-    tools:context="gallery.simplemobiletools.com.MainActivity">
+
+    <GridView
+        android:id="@+id/photo_grid"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="@android:color/black"
+        android:columnWidth="@dimen/photo_size"
+        android:horizontalSpacing="1dp"
+        android:numColumns="auto_fit"
+        android:stretchMode="columnWidth"
+        android:verticalSpacing="1dp"/>
 
 </RelativeLayout>

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

@@ -0,0 +1,37 @@
+<?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">
+
+    <gallery.simplemobiletools.com.MyImageView
+        android:id="@+id/photo"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@android:color/white"/>
+
+    <RelativeLayout
+        android:layout_width="match_parent"
+        android:layout_height="50dp"
+        android:layout_alignParentBottom="true"
+        android:background="#44444444"
+        android:paddingBottom="4dp"
+        android:paddingLeft="8dp"
+        android:paddingRight="8dp"
+        android:paddingTop="4dp">
+
+        <TextView
+            android:id="@+id/dir_name"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingBottom="4dp"
+            android:textColor="@android:color/white"/>
+
+        <TextView
+            android:id="@+id/photo_cnt"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_below="@id/dir_name"
+            android:textColor="@android:color/white"/>
+    </RelativeLayout>
+</RelativeLayout>

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

@@ -1,3 +1,4 @@
 <resources>
     <dimen name="activity_margin">16dp</dimen>
+    <dimen name="photo_size">150dp</dimen>
 </resources>