diff --git a/app/build.gradle b/app/build.gradle
index bce7fc11..34ceef4e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -78,6 +78,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.0.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     implementation 'com.google.android.material:material:1.8.0'
+    implementation project(path: ':common')
 //    implementation 'androidx.camera:camera-video:1.2.3'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
@@ -89,6 +90,7 @@ dependencies {
     // implementation project(path: ':opencv')
     implementation files('libs/devapi.aar')
 
+
 //    implementation group: 'io.netty', name: 'netty-all', version: '4.1.96.Final'
 //    implementation 'io.netty:netty-all:4.1.23.Final'
 //    implementation 'org.apache.logging.log4j:log4j-api:2.14.0'
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index d92481fc..cf10b8d0 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -129,7 +129,7 @@
         </receiver>
 
         <receiver
-            android:name=".UpdateReceiver"
+            android:name="com.xypower.common.UpdateReceiver"
             android:enabled="true"
             android:exported="true" >
             <intent-filter android:priority="90000">
diff --git a/app/src/main/java/com/xypower/mpapp/AppMaster.java b/app/src/main/java/com/xypower/mpapp/AppMaster.java
index c249b4ef..7c975b4a 100644
--- a/app/src/main/java/com/xypower/mpapp/AppMaster.java
+++ b/app/src/main/java/com/xypower/mpapp/AppMaster.java
@@ -7,7 +7,6 @@ import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
-import java.io.UnsupportedEncodingException;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLEncoder;
@@ -20,6 +19,7 @@ import android.text.TextUtils;
 import android.util.Pair;
 
 import com.dev.devapi.api.SysApi;
+import com.xypower.common.FileDownloader;
 
 import org.json.JSONObject;
 
diff --git a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
index 562bb6e3..24fea552 100644
--- a/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
+++ b/app/src/main/java/com/xypower/mpapp/MicroPhotoService.java
@@ -44,6 +44,7 @@ import android.widget.RemoteViews;
 import android.widget.Toast;
 
 import com.dev.devapi.api.SysApi;
+import com.xypower.common.FileDownloader;
 
 import java.io.File;
 import java.lang.reflect.Method;
diff --git a/common/.gitignore b/common/.gitignore
new file mode 100644
index 00000000..42afabfd
--- /dev/null
+++ b/common/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/common/build.gradle b/common/build.gradle
new file mode 100644
index 00000000..db159a66
--- /dev/null
+++ b/common/build.gradle
@@ -0,0 +1,36 @@
+plugins {
+    id 'com.android.library'
+}
+
+android {
+    compileSdk 32
+
+    defaultConfig {
+        minSdk 25
+        targetSdk 32
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation 'com.google.android.material:material:1.4.0'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+    implementation files('libs/devapi.aar')
+}
\ No newline at end of file
diff --git a/common/consumer-rules.pro b/common/consumer-rules.pro
new file mode 100644
index 00000000..e69de29b
diff --git a/common/libs/devapi.aar b/common/libs/devapi.aar
new file mode 100644
index 00000000..743280f4
Binary files /dev/null and b/common/libs/devapi.aar differ
diff --git a/common/proguard-rules.pro b/common/proguard-rules.pro
new file mode 100644
index 00000000..481bb434
--- /dev/null
+++ b/common/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/common/src/main/AndroidManifest.xml b/common/src/main/AndroidManifest.xml
new file mode 100644
index 00000000..90b6e1ca
--- /dev/null
+++ b/common/src/main/AndroidManifest.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.xypower.common">
+
+</manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/xypower/mpapp/FileDownloader.java b/common/src/main/java/com/xypower/common/FileDownloader.java
similarity index 96%
rename from app/src/main/java/com/xypower/mpapp/FileDownloader.java
rename to common/src/main/java/com/xypower/common/FileDownloader.java
index b14f6f5a..04ff5e4d 100644
--- a/app/src/main/java/com/xypower/mpapp/FileDownloader.java
+++ b/common/src/main/java/com/xypower/common/FileDownloader.java
@@ -1,4 +1,4 @@
-package com.xypower.mpapp;
+package com.xypower.common;
 
 import android.text.TextUtils;
 import android.util.Log;
@@ -15,7 +15,7 @@ import java.net.Socket;
 import java.net.URL;
 
 public class FileDownloader {
-    protected boolean download(String urlString, String filePath) {
+    public boolean download(String urlString, String filePath) {
         File downloadFile = null;
         if (TextUtils.isEmpty(urlString))
             return false;
diff --git a/common/src/main/java/com/xypower/common/MicroPhotoContext.java b/common/src/main/java/com/xypower/common/MicroPhotoContext.java
new file mode 100644
index 00000000..edbe7dad
--- /dev/null
+++ b/common/src/main/java/com/xypower/common/MicroPhotoContext.java
@@ -0,0 +1,4 @@
+package com.xypower.common;
+
+public class MicroPhotoContext {
+}
diff --git a/app/src/main/java/com/xypower/mpapp/UpdateReceiver.java b/common/src/main/java/com/xypower/common/UpdateReceiver.java
similarity index 98%
rename from app/src/main/java/com/xypower/mpapp/UpdateReceiver.java
rename to common/src/main/java/com/xypower/common/UpdateReceiver.java
index 3d02c66d..25af2b54 100644
--- a/app/src/main/java/com/xypower/mpapp/UpdateReceiver.java
+++ b/common/src/main/java/com/xypower/common/UpdateReceiver.java
@@ -1,4 +1,4 @@
-package com.xypower.mpapp;
+package com.xypower.common;
 
 import android.content.BroadcastReceiver;
 import android.content.Context;
diff --git a/mpmaster/build.gradle b/mpmaster/build.gradle
index 15925e7f..8cd8ab9a 100644
--- a/mpmaster/build.gradle
+++ b/mpmaster/build.gradle
@@ -7,7 +7,7 @@ android {
 
     defaultConfig {
         applicationId "com.xypower.mpmaster"
-        minSdk 28
+        minSdk 25
         targetSdk 32
         versionCode 1
         versionName "1.0"
@@ -32,6 +32,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation 'com.google.android.material:material:1.4.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation project(path: ':common')
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
diff --git a/settings.gradle b/settings.gradle
index f082db19..1e222e1f 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -19,3 +19,4 @@ include ':mpmaster'
 // include ':opencv'
 // project(':opencv').projectDir = new File(opencvsdk + '/sdk')
 
+include ':common'