diff --git a/easyfloat/build.gradle b/easyfloat/build.gradle
index f4a6125..a869546 100644
--- a/easyfloat/build.gradle
+++ b/easyfloat/build.gradle
@@ -8,7 +8,7 @@ android {
     compileSdkVersion 28
 
     defaultConfig {
-        minSdkVersion 19
+        minSdkVersion 17
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
diff --git a/easyfloat/src/main/java/com/lzf/easyfloat/utils/DisplayUtils.kt b/easyfloat/src/main/java/com/lzf/easyfloat/utils/DisplayUtils.kt
index f80edc2..27b319e 100644
--- a/easyfloat/src/main/java/com/lzf/easyfloat/utils/DisplayUtils.kt
+++ b/easyfloat/src/main/java/com/lzf/easyfloat/utils/DisplayUtils.kt
@@ -7,6 +7,7 @@ import android.os.Build
 import android.provider.Settings
 import android.util.Log
 import android.view.*
+import com.lzf.easyfloat.permission.rom.RomUtils
 
 /**
  * @author: liuzhenfeng
@@ -101,10 +102,15 @@ object DisplayUtils {
      */
     @SuppressLint("PrivateApi")
     fun isNavigationBarShow(context: Context): Boolean {
+
+        // 如果是小米全面屏，并且开启手势操作，则导航栏是隐藏的
+        if (isMiuiFullScreen(context)) return false
+
         var hasNavigationBar = false
         val rs = context.resources
         val id = rs.getIdentifier("config_showNavigationBar", "bool", "android")
         if (id > 0) hasNavigationBar = rs.getBoolean(id)
+
         try {
             val systemPropertiesClass = Class.forName("android.os.SystemProperties")
             val m = systemPropertiesClass.getMethod("get", String::class.java)
@@ -125,4 +131,17 @@ object DisplayUtils {
         return hasNavigationBar
     }
 
+    /**
+     * 不包含导航栏的有效高度（没有导航栏，或者已去除导航栏的高度）
+     */
+    fun rejectedNavHeight(context: Context) =
+        getScreenHeight(context) - getNavigationBarCurrentHeight(context)
+
+    /**
+     * 是否是小米全面屏，并且开启了手势操作
+     */
+    private fun isMiuiFullScreen(context: Context) =
+        RomUtils.checkIsMiuiRom() &&
+                Settings.Global.getInt(context.contentResolver, "force_fsg_nav_bar", 0) != 0
+
 }
\ No newline at end of file
diff --git a/easyfloat/src/main/java/com/lzf/easyfloat/widget/appfloat/TouchUtils.kt b/easyfloat/src/main/java/com/lzf/easyfloat/widget/appfloat/TouchUtils.kt
index 94fe79a..fdbfff1 100644
--- a/easyfloat/src/main/java/com/lzf/easyfloat/widget/appfloat/TouchUtils.kt
+++ b/easyfloat/src/main/java/com/lzf/easyfloat/widget/appfloat/TouchUtils.kt
@@ -24,7 +24,7 @@ internal class TouchUtils(val context: Context, val config: FloatConfig) {
     private var parentRect: Rect = Rect()
     // 悬浮的父布局高度、宽度
     private var parentHeight = 0
-    private var parentWidth = 0
+    private val parentWidth = DisplayUtils.getScreenWidth(context)
     // 起点坐标
     private var lastX = 0f
     private var lastY = 0f
@@ -39,10 +39,6 @@ internal class TouchUtils(val context: Context, val config: FloatConfig) {
     private val location = IntArray(2)
     // 屏幕可用高度 - 浮窗自身高度 的剩余高度
     private var emptyHeight = 0
-    // 屏幕高度
-    private val screenHeight = DisplayUtils.getScreenHeight(context)
-    // 虚拟导航栏高度
-    private val navigationBarHeight = DisplayUtils.getNavigationBarCurrentHeight(context)
     // 是否包含状态栏
     private var hasStatusBar = true
 
@@ -69,10 +65,8 @@ internal class TouchUtils(val context: Context, val config: FloatConfig) {
                 // 记录触摸点的位置
                 lastX = event.rawX
                 lastY = event.rawY
-                windowManager.defaultDisplay.getRectSize(parentRect)
-                parentWidth = parentRect.width()
-                // 可用高度 = 屏幕高度 - 导航栏
-                parentHeight = screenHeight - navigationBarHeight
+                // 可用高度需要每次获取，因为虚拟导航栏的状态可能是变化的
+                parentHeight = DisplayUtils.rejectedNavHeight(context)
                 // 获取在整个屏幕内的绝对坐标
                 view.getLocationOnScreen(location)
                 // 通过绝对高度和相对高度比较，判断包含顶部状态栏
diff --git a/example/release/EasyFloat.apk b/example/release/EasyFloat.apk
index e97ecf1..9ae14e1 100644
Binary files a/example/release/EasyFloat.apk and b/example/release/EasyFloat.apk differ