diff --git a/DuplicatedBitmapAnalyzer/build.gradle b/DuplicatedBitmapAnalyzer/build.gradle
index 912e192..73fba8f 100644
--- a/DuplicatedBitmapAnalyzer/build.gradle
+++ b/DuplicatedBitmapAnalyzer/build.gradle
@@ -6,6 +6,8 @@ version 1.0
 
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.squareup.haha:haha:2.0.4'
+    implementation 'com.alibaba:fastjson:1.2.10'
 }
 
 
diff --git a/DuplicatedBitmapAnalyzer/src/com/hprof/bitmap/Main.java b/DuplicatedBitmapAnalyzer/src/com/hprof/bitmap/Main.java
deleted file mode 100644
index 202764e..0000000
--- a/DuplicatedBitmapAnalyzer/src/com/hprof/bitmap/Main.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.hprof.bitmap;
-
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.nio.channels.FileChannel;
-import java.util.ArrayList;
-
-public class Main {
-
-    public static void main(String[] args) throws IOException {
-    }
-}
diff --git a/DuplicatedBitmapAnalyzer/src/main/java/com/hprof/bitmap/Main.java b/DuplicatedBitmapAnalyzer/src/main/java/com/hprof/bitmap/Main.java
new file mode 100644
index 0000000..d944c3e
--- /dev/null
+++ b/DuplicatedBitmapAnalyzer/src/main/java/com/hprof/bitmap/Main.java
@@ -0,0 +1,160 @@
+package com.hprof.bitmap;
+
+import com.alibaba.fastjson.JSONArray;
+import com.alibaba.fastjson.JSONObject;
+import com.squareup.haha.perflib.ArrayInstance;
+import com.squareup.haha.perflib.ClassInstance;
+import com.squareup.haha.perflib.ClassObj;
+import com.squareup.haha.perflib.Heap;
+import com.squareup.haha.perflib.HprofParser;
+import com.squareup.haha.perflib.Instance;
+import com.squareup.haha.perflib.Snapshot;
+import com.squareup.haha.perflib.io.HprofBuffer;
+import com.squareup.haha.perflib.io.MemoryMappedFileBuffer;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.security.MessageDigest;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+
+    private static Map<String, Entity> map = new HashMap<>();
+    private static Method method;
+    static {
+        try {
+            method = ArrayInstance.class.getDeclaredMethod("asRawByteArray", int.class, int.class);
+            method.setAccessible(true);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        HprofBuffer buffer = new MemoryMappedFileBuffer(new File(args[0]));
+        HprofParser parser = new HprofParser(buffer);
+        Snapshot snapshot = parser.parse();
+        snapshot.computeDominators();
+
+        if (method == null) {
+            throw new IllegalStateException("array instance reflect error");
+        }
+        ClassObj classObj = snapshot.findClass("android.graphics.Bitmap");
+        Heap heap = snapshot.getHeap("app");
+        List<Instance> instances = classObj.getHeapInstances(heap.getId());
+        map.clear();
+
+        analysis(instances);
+
+        for (Entity e : map.values()) {
+            System.out.println(e);
+        }
+    }
+
+    private static void analysis(List<Instance> instances) {
+        for (Instance i : instances) {
+            try {
+                ArrayInstance buffer = fieldValue(((ClassInstance) i).getValues(), "mBuffer");
+                int width = fieldValue(((ClassInstance) i).getValues(), "mWidth");
+                int height = fieldValue(((ClassInstance) i).getValues(), "mHeight");
+                byte[] data = (byte[]) method.invoke(buffer, 0, buffer.getSize());
+                String key = getMd5(data);
+                Entity entity = map.get(key);
+                if (entity == null) {
+                    entity = new Entity(data.length, width, height, key);
+                    map.put(key, entity);
+                }
+                entity.addInstance(i);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    private static <T> T fieldValue(List<ClassInstance.FieldValue> values, String fieldName) {
+        for (ClassInstance.FieldValue fieldValue : values) {
+            if (fieldValue.getField().getName().equals(fieldName)) {
+                return (T) fieldValue.getValue();
+            }
+        }
+        throw new IllegalArgumentException("Field " + fieldName + " does not exists");
+    }
+
+    public static String getMd5(byte[] bytes) {
+        try {
+            MessageDigest md5 = MessageDigest.getInstance("MD5");
+            md5.update(bytes, 0, bytes.length);
+            return byteArrayToHex(md5.digest()).toLowerCase();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return "";
+    }
+
+    private static String byteArrayToHex(byte[] byteArray) {
+        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+        char[] resultCharArray = new char[byteArray.length * 2];
+        int index = 0;
+        for (byte b : byteArray) {
+            resultCharArray[index++] = hexDigits[b >>> 4 & 0xf];
+            resultCharArray[index++] = hexDigits[b & 0xf];
+        }
+        return new String(resultCharArray);
+    }
+
+    static class Entity {
+        private List<Instance> instances = new ArrayList<>();
+        private String hash;
+        private int len;
+        private int width;
+        private int height;
+
+        public Entity(int len, int width, int height, String hash) {
+            this.hash = hash;
+            this.len = len;
+            this.width = width;
+            this.height = height;
+        }
+
+        public void addInstance(Instance i) {
+            this.instances.add(i);
+        }
+
+        @Override
+        public String toString() {
+            JSONObject object = new JSONObject();
+            object.fluentPut("duplicateCount", instances.size());
+            object.fluentPut("bufferHash", hash);
+            object.fluentPut("width", width);
+            object.fluentPut("height", height);
+            object.fluentPut("bufferSize", len);
+            JSONArray array = new JSONArray();
+            for (Instance i : instances) {
+                JSONArray path = new JSONArray();
+                List<Instance> list = getStackInfo(i);
+                for (Instance p : list) {
+                    path.add("" + p);
+                }
+                if (!path.isEmpty()) {
+                    array.add(path);
+                }
+            }
+            object.fluentPut("stacks", array);
+            return object.toString();
+        }
+
+        private List<Instance> getStackInfo(Instance instance) {
+            List<Instance> arrayList = new ArrayList<>();
+            Instance nextInstance;
+            while ((nextInstance = instance.getNextInstanceToGcRoot()) != null) {
+                arrayList.add(nextInstance);
+                instance = nextInstance;
+            }
+            return arrayList;
+        }
+    }
+}