优化：单 sim 卡槽手机不显示 sim2 设置。

app/src/main/java/com/idormy/sms/forwarder/fragment/SettingsFragment.kt

@@ -180,12 +180,18 @@ class SettingsFragment : BaseFragment<FragmentSettingsBinding?>(), View.OnClickL
         editAddExtraDeviceMark(binding!!.etExtraDeviceMark)
         //SIM1主键
         editAddSubidSim1(binding!!.etSubidSim1)
-        //SIM2主键
-        editAddSubidSim2(binding!!.etSubidSim2)
         //SIM1备注
         editAddExtraSim1(binding!!.etExtraSim1)
-        //SIM2备注
+
-        editAddExtraSim2(binding!!.etExtraSim2)
+        // sim 槽只有一个的时候不显示 SIM2 设置
+        if (PhoneUtils.getSimSlotCount() != 1) {
+            //SIM2主键
+            editAddSubidSim2(binding!!.etSubidSim2)
+            //SIM2备注
+            editAddExtraSim2(binding!!.etExtraSim2)
+        } else {
+            binding!!.layoutSim2.visibility = View.GONE
+        }
         //通知内容
         editNotifyContent(binding!!.etNotifyContent)
         //启用自定义模版
@@ -991,7 +997,7 @@ class SettingsFragment : BaseFragment<FragmentSettingsBinding?>(), View.OnClickL
 
     //设置SIM1主键
     private fun editAddSubidSim1(etSubidSim1: EditText) {
-        etSubidSim1.setText(SettingUtils.subidSim1.toString())
+        etSubidSim1.setText("${SettingUtils.subidSim1}")
         etSubidSim1.addTextChangedListener(object : TextWatcher {
             override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
             override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}
@@ -1008,7 +1014,7 @@ class SettingsFragment : BaseFragment<FragmentSettingsBinding?>(), View.OnClickL
 
     //设置SIM2主键
     private fun editAddSubidSim2(etSubidSim2: EditText) {
-        etSubidSim2.setText(SettingUtils.subidSim2.toString())
+        etSubidSim2.setText("${SettingUtils.subidSim2}")
         etSubidSim2.addTextChangedListener(object : TextWatcher {
             override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
             override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}

app/src/main/java/com/idormy/sms/forwarder/utils/PhoneUtils.kt

@@ -14,6 +14,7 @@ import android.provider.Settings
 import android.telephony.SmsManager
 import android.telephony.SubscriptionInfo
 import android.telephony.SubscriptionManager
+import android.telephony.TelephonyManager
 import android.text.TextUtils
 import androidx.annotation.RequiresPermission
 import androidx.core.app.ActivityCompat
@@ -37,6 +38,14 @@ class PhoneUtils private constructor() {
     companion object {
         const val TAG = "PhoneUtils"
 
+        /** 获取 sim 卡槽数量，注意不是 sim 卡的数量。*/
+        fun getSimSlotCount() = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R)
+            (App.context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager).activeModemCount
+        else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
+            (App.context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager).phoneCount
+        else
+            -1
+
         //获取多卡信息
         @SuppressLint("Range")
         fun getSimMultiInfo(): MutableMap<Int, SimInfo> {

app/src/main/res/layout/fragment_settings.xml

@@ -1567,6 +1567,7 @@
             </LinearLayout>
 
             <LinearLayout
+                android:id="@+id/layout_sim2"
                 style="@style/BarStyle"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"