first_version

AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.vladimir.pinterestlistview"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15"/>
+
+    <application
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name" >
+        <activity
+            android:name=".ItemsActivity"
+            android:label="@string/app_name" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

lint.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<lint>
+    <issue id="ParserError" severity="ignore" />
+</lint>

proguard.cfg

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+-optimizationpasses 5
+-dontusemixedcaseclassnames
+-dontskipnonpubliclibraryclasses
+-dontpreverify
+-verbose
+-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
+
+-keep public class * extends android.app.Activity
+-keep public class * extends android.app.Application
+-keep public class * extends android.app.Service
+-keep public class * extends android.content.BroadcastReceiver
+-keep public class * extends android.content.ContentProvider
+-keep public class * extends android.app.backup.BackupAgentHelper
+-keep public class * extends android.preference.Preference
+-keep public class com.android.vending.licensing.ILicensingService
+
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet);
+}
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+
+-keepclassmembers class * extends android.app.Activity {
+   public void *(android.view.View);
+}
+
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+-keep class * implements android.os.Parcelable {
+  public static final android.os.Parcelable$Creator *;
+}

project.properties

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+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system use,
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+
+# Project target.
+target=android-14

res/layout/item.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/item_image"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_centerHorizontal="true"
+    android:adjustViewBounds="true"
+    android:scaleType="fitCenter" 
+    android:paddingTop="10dp"/>

res/layout/items_list.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:orientation="horizontal"
+    android:paddingLeft="10dp"
+    android:paddingRight="10dp" >
+
+    <ListView
+        android:id="@+id/list_view_left"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:layout_weight="1"
+        android:paddingRight="5dp"
+        android:scrollbars="none" >
+    </ListView>
+
+    <ListView
+        android:id="@+id/list_view_right"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:layout_weight="1"
+        android:paddingLeft="5dp"
+        android:scrollbars="none" >
+    </ListView>
+
+</LinearLayout>

res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">PinterestListView</string>
+</resources>

src/com/vladimir/pinterestlistview/ItemsActivity.java

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+package com.vladimir.pinterestlistview;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnTouchListener;
+import android.widget.AbsListView;
+import android.widget.AbsListView.OnScrollListener;
+import android.widget.ListView;
+
+import com.vladimir.pinterestlistview.adapters.ItemsAdapter;
+
+public class ItemsActivity extends Activity {
+
+	private final String TAG = "FeedActivity";
+
+	private ListView listViewLeft;
+	private ListView listViewRight;
+	private ItemsAdapter leftAdapter;
+	private ItemsAdapter rightAdapter;
+
+	int[] leftViewsHeights;
+	int[] rightViewsHeights;
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.items_list);	
+
+		listViewLeft = (ListView) findViewById(R.id.list_view_left);
+		listViewRight = (ListView) findViewById(R.id.list_view_right);
+
+		loadItems();
+
+		listViewLeft.setOnTouchListener(touchListener);
+		listViewRight.setOnTouchListener(touchListener);		
+		listViewLeft.setOnScrollListener(scrollListener);
+		listViewRight.setOnScrollListener(scrollListener);
+	}
+
+	OnTouchListener touchListener = new OnTouchListener() {					
+		boolean dispatched = false;
+
+		@Override
+		public boolean onTouch(View v, MotionEvent event) {
+			if (v.equals(listViewLeft) && !dispatched) {
+				dispatched = true;
+				listViewRight.dispatchTouchEvent(event);
+			} else if (v.equals(listViewRight) && !dispatched) {
+				dispatched = true;
+				listViewLeft.dispatchTouchEvent(event);
+			}
+
+			dispatched = false;
+			return false;
+		}
+	};
+
+	OnScrollListener scrollListener = new OnScrollListener() {
+
+		@Override
+		public void onScrollStateChanged(AbsListView v, int scrollState) {	
+		}
+
+		@Override
+		public void onScroll(AbsListView view, int firstVisibleItem,
+				int visibleItemCount, int totalItemCount) {
+
+			if (view.getChildAt(0) != null) {
+				if (view.equals(listViewLeft) ){
+					leftViewsHeights[view.getFirstVisiblePosition()] = view.getChildAt(0).getHeight();
+
+					int h = 0;
+					for (int i = 0; i < listViewRight.getFirstVisiblePosition(); i++) {
+						h += rightViewsHeights[i];
+					}
+
+					int hi = 0;
+					for (int i = 0; i < listViewLeft.getFirstVisiblePosition(); i++) {
+						hi += leftViewsHeights[i];
+					}
+
+					int top = h - hi + view.getChildAt(0).getTop();
+					listViewRight.setSelectionFromTop(listViewRight.getFirstVisiblePosition(), top);
+				} else if (view.equals(listViewRight)) {
+					rightViewsHeights[view.getFirstVisiblePosition()] = view.getChildAt(0).getHeight();
+
+					int h = 0;
+					for (int i = 0; i < listViewLeft.getFirstVisiblePosition(); i++) {
+						h += leftViewsHeights[i];
+					}
+
+					int hi = 0;
+					for (int i = 0; i < listViewRight.getFirstVisiblePosition(); i++) {
+						hi += rightViewsHeights[i];
+					}
+
+					int top = h - hi + view.getChildAt(0).getTop();
+					listViewLeft.setSelectionFromTop(listViewLeft.getFirstVisiblePosition(), top);
+				}
+
+			}
+
+		}
+	};
+
+	private void loadItems(){
+		Integer[] leftItems = new Integer[]{R.drawable.ic_1, R.drawable.ic_2, R.drawable.ic_3, R.drawable.ic_4, R.drawable.ic_5};
+		Integer[] rightItems = new Integer[]{R.drawable.ic_6, R.drawable.ic_7, R.drawable.ic_8, R.drawable.ic_9, R.drawable.ic_10};
+
+		leftAdapter = new ItemsAdapter(this, R.layout.item, leftItems);
+		rightAdapter = new ItemsAdapter(this, R.layout.item, rightItems);
+		listViewLeft.setAdapter(leftAdapter);
+		listViewRight.setAdapter(rightAdapter);
+
+		leftViewsHeights = new int[leftItems.length];
+		rightViewsHeights = new int[rightItems.length];	
+	}
+
+
+}

src/com/vladimir/pinterestlistview/adapters/ItemsAdapter.java

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+package com.vladimir.pinterestlistview.adapters;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.util.DisplayMetrics;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.ImageView;
+import android.widget.RelativeLayout;
+
+public class ItemsAdapter extends ArrayAdapter<Integer>{
+
+    Context context; 
+    LayoutInflater inflater;
+    int layoutResourceId;
+    int imageWidth;
+
+    public ItemsAdapter(Context context, int layoutResourceId, Integer[] items) {
+        super(context, layoutResourceId, items);
+        this.context = context;
+        this.layoutResourceId = layoutResourceId;
+
+        int width = ((Activity)context).getWindowManager().getDefaultDisplay().getWidth();
+		int margin = (int)convertDpToPixel(10f, (Activity)context);
+		imageWidth = (width - (3 * margin));
+    }
+
+	@Override
+    public View getView(int position, View convertView, ViewGroup parent) {
+        ImageView row = (ImageView) convertView;
+        ItemHolder holder;
+        Integer item = getItem(position);
+
+		if (row == null) {
+			holder = new ItemHolder();
+            inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+            row = (ImageView) inflater.inflate(layoutResourceId, parent, false);
+			holder.itemImage = row;
+		} else {
+			holder = (ItemHolder) row.getTag();
+		}
+
+		row.setTag(holder);
+		setImageBitmap(item, holder.itemImage);
+        return row;
+    }
+
+
+	private void setImageBitmap(Integer item, ImageView imageView){
+		Bitmap bitmap = BitmapFactory.decodeResource(getContext().getResources(), item);
+		if (imageWidth != 0){
+			float i = ((float)imageWidth)/((float)bitmap.getWidth());
+			float imageHeight = i * (bitmap.getHeight());
+			RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
+			params.height = (int) imageHeight;
+			params.width = imageWidth;
+			imageView.setLayoutParams(params);
+		}
+		imageView.setImageBitmap(bitmap);
+	}
+
+	public static float convertDpToPixel(float dp, Context context){
+	    Resources resources = context.getResources();
+	    DisplayMetrics metrics = resources.getDisplayMetrics();
+	    float px = dp * (metrics.densityDpi/160f);
+	    return px;
+	}
+
+    public static class ItemHolder
+    {
+        ImageView itemImage;
+    }
+}