diff --git a/android-example/app/build.gradle b/android-example/app/build.gradle
index 5493a87..28b5fe2 100755
--- a/android-example/app/build.gradle
+++ b/android-example/app/build.gradle
@@ -8,7 +8,7 @@ android {
         minSdkVersion 19
         targetSdkVersion 27
         versionCode 4
-        versionName '0.1.5'
+        versionName '0.2.0'
     }
     buildTypes {
         release {
diff --git a/android-example/app/release/app-release.apk b/android-example/app/release/app-release.apk
index eac00ea..fd8d479 100644
Binary files a/android-example/app/release/app-release.apk and b/android-example/app/release/app-release.apk differ
diff --git a/android-example/app/release/output.json b/android-example/app/release/output.json
index d15b5a7..d7050db 100644
--- a/android-example/app/release/output.json
+++ b/android-example/app/release/output.json
@@ -1 +1 @@
-[{"outputType":{"type":"APK"},"apkInfo":{"type":"MAIN","splits":[],"versionCode":4,"versionName":"0.1.5","enabled":true,"outputFile":"app-release.apk","fullName":"release","baseName":"release"},"path":"app-release.apk","properties":{}}]
\ No newline at end of file
+[{"outputType":{"type":"APK"},"apkInfo":{"type":"MAIN","splits":[],"versionCode":4,"versionName":"0.2.0","enabled":true,"outputFile":"app-release.apk","fullName":"release","baseName":"release"},"path":"app-release.apk","properties":{}}]
\ No newline at end of file
diff --git a/android-example/web-api/src/main/java/net/irext/webapi/WebAPIs.java b/android-example/web-api/src/main/java/net/irext/webapi/WebAPIs.java
index 735ed25..11db8e0 100755
--- a/android-example/web-api/src/main/java/net/irext/webapi/WebAPIs.java
+++ b/android-example/web-api/src/main/java/net/irext/webapi/WebAPIs.java
@@ -39,6 +39,11 @@ public class WebAPIs {
     private static final String DEFAULT_APP = "/irext-server";
     private static String URL_PREFIX = DEFAULT_ADDRESS + DEFAULT_APP;
 
+    // download bin from OSS
+    private static final String IR_BIN_FILE_PREFIX = "irda_";
+    private static final String IR_BIN_FILE_SUFFIX = ".bin";
+    private static final String IR_BIN_DOWNLOAD_PREFIX = "http://irext-debug.oss-cn-hangzhou.aliyuncs.com/";
+
     private static final String SERVICE_SIGN_IN = "/app/app_login";
     private static final String SERVICE_LIST_CATEGORIES = "/indexing/list_categories";
     private static final String SERVICE_LIST_BRANDS = "/indexing/list_brands";
@@ -73,6 +78,16 @@ public class WebAPIs {
         return mInstance;
     }
 
+    private InputStream getFileByteStreamByURL(String url) throws IOException {
+        Request request = new Request.Builder()
+                .url(url)
+                .get()
+                .build();
+
+        Response response = new OkHttpClient().newCall(request).execute();
+        return response.body().byteStream();
+    }
+
     private String postToServer(String url, String json) throws IOException {
         MediaType JSON
                 = MediaType.parse("application/json; charset=utf-8");
@@ -308,7 +323,8 @@ public class WebAPIs {
     @SuppressWarnings("unused")
     public void downloadBin(String remoteMap, int indexId,
                             DownloadBinCallback downloadBinCallback) {
-        String downloadURL = URL_PREFIX + SERVICE_DOWNLOAD_BIN;
+        String fileName = IR_BIN_FILE_PREFIX + remoteMap + IR_BIN_FILE_SUFFIX;
+        String downloadURL = IR_BIN_DOWNLOAD_PREFIX + fileName;
         DownloadBinaryRequest downloadBinaryRequest = new DownloadBinaryRequest();
         downloadBinaryRequest.setId(id);
         downloadBinaryRequest.setToken(token);
@@ -318,7 +334,7 @@ public class WebAPIs {
 
         if (null != bodyJson) {
             try {
-                InputStream binStream = postToServerForOctets(downloadURL, bodyJson);
+                InputStream binStream = getFileByteStreamByURL(downloadURL);
 
                 if (null != binStream) {
                     downloadBinCallback.onDownloadBinSuccess(binStream);