diff --git a/app/build.gradle b/app/build.gradle
index 0e04729..135ae55 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -25,7 +25,8 @@ android {
 
     buildTypes {
         release {
-            minifyEnabled = false
+            minifyEnabled = true
+            shrinkResources = true
             signingConfig = signingConfigs.release
         }
     }
diff --git a/app/videonative/src/main/java/com/geehe/videonative/DecodingInfo.java b/app/videonative/src/main/java/com/geehe/videonative/DecodingInfo.java
index 499c2ac..f7aad1c 100644
--- a/app/videonative/src/main/java/com/geehe/videonative/DecodingInfo.java
+++ b/app/videonative/src/main/java/com/geehe/videonative/DecodingInfo.java
@@ -1,9 +1,11 @@
 package com.geehe.videonative;
 
+import androidx.annotation.Keep;
+
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-@SuppressWarnings("WeakerAccess")
+@Keep
 public class DecodingInfo {
     public final float currentFPS;
     public final float currentKiloBitsPerSecond;
@@ -76,4 +78,4 @@ public String toString(final boolean newline) {
     public String toString() {
         return toString(false);
     }
-}
\ No newline at end of file
+}
diff --git a/app/videonative/src/main/java/com/geehe/videonative/IVideoParamsChanged.java b/app/videonative/src/main/java/com/geehe/videonative/IVideoParamsChanged.java
index c89ece5..03db5fa 100644
--- a/app/videonative/src/main/java/com/geehe/videonative/IVideoParamsChanged.java
+++ b/app/videonative/src/main/java/com/geehe/videonative/IVideoParamsChanged.java
@@ -1,6 +1,8 @@
 package com.geehe.videonative;
 
-// Also called by native code
+import androidx.annotation.Keep;
+
+@Keep
 public interface IVideoParamsChanged {
     void onVideoRatioChanged(int videoW, int videoH);
 
diff --git a/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNGStats.java b/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNGStats.java
index 23ef33b..2b79ae4 100644
--- a/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNGStats.java
+++ b/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNGStats.java
@@ -1,5 +1,8 @@
 package com.geehe.wfbngrtl8812;
 
+import androidx.annotation.Keep;
+
+@Keep
 public class WfbNGStats {
     public final int count_p_all;
     public final int count_p_dec_err;
diff --git a/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNgLink.java b/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNgLink.java
index df61dd8..ce146f2 100644
--- a/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNgLink.java
+++ b/app/wfbngrtl8812/src/main/java/com/geehe/wfbngrtl8812/WfbNgLink.java
@@ -1,12 +1,12 @@
 package com.geehe.wfbngrtl8812;
 
-
 import android.content.Context;
 import android.hardware.usb.UsbDevice;
 import android.hardware.usb.UsbDeviceConnection;
 import android.hardware.usb.UsbManager;
 import android.util.Log;
 
+import androidx.annotation.Keep;
 import androidx.appcompat.app.AppCompatActivity;
 
 import java.util.HashMap;
@@ -14,6 +14,7 @@
 import java.util.Timer;
 import java.util.TimerTask;
 
+@Keep
 public class WfbNgLink implements WfbNGStatsChanged {
     public static String TAG = "com.geehe.fpvue";