init

android/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.cxx

android/build.gradle

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+group 'com.nschairer.keyboard_height_plugin'
+version '1.0-SNAPSHOT'
+
+buildscript {
+    ext.kotlin_version = '1.7.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.2.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+
+android {
+    compileSdkVersion 31
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        minSdkVersion 16
+    }
+}

android/settings.gradle

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+rootProject.name = 'keyboard_height_plugin'

android/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="com.nschairer.keyboard_height_plugin">
+</manifest>

android/src/main/kotlin/com/nschairer/keyboard_height_plugin/KeyboardHeightPlugin.kt

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+package com.nschairer.keyboard_height_plugin
+import android.graphics.Rect
+import androidx.annotation.NonNull
+import android.view.ViewTreeObserver
+import io.flutter.embedding.engine.plugins.FlutterPlugin
+import io.flutter.plugin.common.EventChannel
+import io.flutter.embedding.engine.plugins.activity.ActivityAware
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
+
+class KeyboardHeightPlugin : FlutterPlugin, EventChannel.StreamHandler, ActivityAware {
+    private val keyboardHeightEventChannelName = "keyboardHeightEventChannel"
+    private var eventSink: EventChannel.EventSink? = null
+    private var eventChannel: EventChannel? = null
+    private var activityPluginBinding: ActivityPluginBinding? = null
+
+    override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
+        eventChannel = EventChannel(flutterPluginBinding.binaryMessenger, keyboardHeightEventChannelName)
+        eventChannel?.setStreamHandler(this)
+    }
+
+    override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
+        eventChannel?.setStreamHandler(null)
+    }
+
+    override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
+        eventSink = events
+        val rootView = activityPluginBinding?.activity?.window?.decorView?.rootView
+        rootView?.viewTreeObserver?.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
+            override fun onGlobalLayout() {
+                val r = Rect()
+                rootView.getWindowVisibleDisplayFrame(r)
+
+                val screenHeight = rootView.height
+                val keypadHeight = screenHeight - r.bottom - getNavigationBarHeight()
+
+                val displayMetrics = activityPluginBinding?.activity?.resources?.displayMetrics
+                val logicalKeypadHeight = keypadHeight / (displayMetrics?.density ?: 1f)
+
+                if (keypadHeight > screenHeight * 0.15) {
+                    events?.success(logicalKeypadHeight.toDouble())
+                } else {
+                    events?.success(0.0)
+                }
+            }
+        })
+    }
+
+    override fun onCancel(arguments: Any?) {
+        eventSink = null
+    }
+
+    private fun getNavigationBarHeight(): Int {
+        val resourceId = activityPluginBinding?.activity?.resources?.getIdentifier("navigation_bar_height", "dimen", "android")
+        return if (resourceId != null && resourceId > 0) {
+            activityPluginBinding?.activity?.resources?.getDimensionPixelSize(resourceId) ?: 0
+        } else {
+            0
+        }
+    }
+
+    // Implement ActivityAware methods
+    override fun onAttachedToActivity(binding: ActivityPluginBinding) {
+        activityPluginBinding = binding
+    }
+
+    override fun onDetachedFromActivityForConfigChanges() {
+        activityPluginBinding = null
+    }
+
+    override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
+        activityPluginBinding = binding
+    }
+
+    override fun onDetachedFromActivity() {
+        activityPluginBinding = null
+    }
+}