diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index bd626e8..d4de274 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -34,6 +34,7 @@
         <activity android:name="luyao.util.ktx.ui.ActivityExtActivity"/>
         <activity android:name="luyao.util.ktx.ui.AnotherActivity"/>
         <activity android:name="luyao.util.ktx.ui.ListenerExtActivity"/>
+        <activity android:name="luyao.util.ktx.ui.CommonExtActivity"/>
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/ktx/src/main/java/luyao/util/ktx/ext/CommonExt.kt b/ktx/src/main/java/luyao/util/ktx/ext/CommonExt.kt
index e73bc6a..8f3d4ff 100644
--- a/ktx/src/main/java/luyao/util/ktx/ext/CommonExt.kt
+++ b/ktx/src/main/java/luyao/util/ktx/ext/CommonExt.kt
@@ -38,7 +38,6 @@ val Context.screenHeight
     get() = resources.displayMetrics.heightPixels
 
 fun Context.copyToClipboard(label: String, text: String) {
-    val cm = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
     val clipData = ClipData.newPlainText(label, text)
-    cm.primaryClip = clipData
+    clipboardManager?.primaryClip = clipData
 }
\ No newline at end of file
diff --git a/ktx/src/main/java/luyao/util/ktx/ext/LogExt.kt b/ktx/src/main/java/luyao/util/ktx/ext/LogExt.kt
index 677abbe..9629ebe 100644
--- a/ktx/src/main/java/luyao/util/ktx/ext/LogExt.kt
+++ b/ktx/src/main/java/luyao/util/ktx/ext/LogExt.kt
@@ -1,6 +1,7 @@
 package luyao.util.ktx.ext
 
 import android.util.Log
+import luyao.util.ktx.BuildConfig
 
 /**
  * Created by luyao
@@ -9,6 +10,8 @@ import android.util.Log
 
 const val TAG = "ktx"
 
+var showLog = BuildConfig.DEBUG
+
 private enum class LEVEL {
     V, D, I, W, E
 }
@@ -20,6 +23,7 @@ fun String.logw(tag: String = TAG) = log(LEVEL.W, tag, this)
 fun String.loge(tag: String = TAG) = log(LEVEL.E, tag, this)
 
 private fun log(level: LEVEL, tag: String, message: String) {
+    if (!showLog) return
     when (level) {
         LEVEL.V -> Log.v(tag, message)
         LEVEL.D -> Log.d(tag, message)