diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index ad3d055..7c200df 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -3,9 +3,7 @@
           xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.INTERNET"/>
-    <uses-permission android:name="android.permission.READ_SMS"/>
     <uses-permission android:name="android.permission.RECEIVE_SMS"/>
-    <uses-permission android:name="android.permission.READ_CONTACTS"/>
     <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
 
     <application
@@ -13,7 +11,6 @@
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
-        android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity android:name=".MainActivity">
diff --git a/app/src/main/java/com/dss886/transmis/MainActivity.java b/app/src/main/java/com/dss886/transmis/MainActivity.java
index cd53dfc..60f7201 100644
--- a/app/src/main/java/com/dss886/transmis/MainActivity.java
+++ b/app/src/main/java/com/dss886/transmis/MainActivity.java
@@ -41,7 +41,7 @@ protected void addViews() {
         mMailItem = new TextItem(this, "邮件参数设置").showRightArrow();
         mHelpItem = new TextItem(this, "使用帮助");
         mVersionItem = new TextItem(this, "检查更新", "当前版本 v" + BuildConfig.VERSION_NAME);
-        mLicenseItem = new TextItem(this, "开源许可", "Apache 2.0");
+        mLicenseItem = new TextItem(this, "开源许可", "GNU v3.0");
 
         addView(mGlobalSwitch);
         addView(new SectionItem(this, "监听内容"));
diff --git a/app/src/main/java/com/dss886/transmis/mail/MailActivity.java b/app/src/main/java/com/dss886/transmis/mail/MailActivity.java
index 43aa899..bd07629 100644
--- a/app/src/main/java/com/dss886/transmis/mail/MailActivity.java
+++ b/app/src/main/java/com/dss886/transmis/mail/MailActivity.java
@@ -47,8 +47,9 @@ protected void addViews() {
             String value = sp.getString(Tags.SP_MAIL_SEND_MAIL, null);
             return TextUtils.isEmpty(value) ? "未设置" : value;
         });
-        mSendPasswordItem = new TextItem(this, "发件人密码/授权码").asPassword().setCallback(sp -> {
+        mSendPasswordItem = new TextItem(this, "发件人密码/授权码").setCallback(sp -> {
             String value = sp.getString(Tags.SP_MAIL_SEND_PASSWORD, null);
+            mSendPasswordItem.setIsPassword(!TextUtils.isEmpty(value));
             return TextUtils.isEmpty(value) ? "未设置" : value;
         });
         mReceiveItem = new TextItem(this, "收件人邮箱").setCallback(sp -> {
diff --git a/app/src/main/java/com/dss886/transmis/view/TextItem.java b/app/src/main/java/com/dss886/transmis/view/TextItem.java
index 3d38b05..bd441e5 100644
--- a/app/src/main/java/com/dss886/transmis/view/TextItem.java
+++ b/app/src/main/java/com/dss886/transmis/view/TextItem.java
@@ -43,8 +43,12 @@ public TextItem showRightArrow() {
         return this;
     }
 
-    public TextItem asPassword() {
-        mContentView.setInputType(InputType.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_PASSWORD);
+    public TextItem setIsPassword(boolean isPassword) {
+        if (isPassword) {
+            mContentView.setInputType(InputType.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_PASSWORD);
+        } else {
+            mContentView.setInputType(InputType.TYPE_CLASS_TEXT);
+        }
         return this;
     }
 
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
deleted file mode 100644
index 5507303..0000000
Binary files a/app/src/main/res/mipmap-hdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
deleted file mode 100644
index 8fab6a3..0000000
Binary files a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
deleted file mode 100644
index 6bc7fcd..0000000
Binary files a/app/src/main/res/mipmap-mdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
deleted file mode 100644
index 1eecc0e..0000000
Binary files a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
index ec87dce..88d3c3e 100644
Binary files a/app/src/main/res/mipmap-xhdpi/ic_launcher.png and b/app/src/main/res/mipmap-xhdpi/ic_launcher.png differ
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
deleted file mode 100644
index 05ca079..0000000
Binary files a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
deleted file mode 100644
index 6f67f21..0000000
Binary files a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
deleted file mode 100644
index 8bac0f2..0000000
Binary files a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
deleted file mode 100644
index 0327e13..0000000
Binary files a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png and /dev/null differ
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
deleted file mode 100644
index bacd3e7..0000000
Binary files a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png and /dev/null differ