Fixes #1632: Hides keyboard on exit, shows on entry

app/src/main/java/org/mozilla/fenix/HomeActivity.kt

@@ -4,6 +4,7 @@
 
 package org.mozilla.fenix
 
+import android.app.Activity
 import android.content.Context
 import android.content.Intent
 import android.os.Build
@@ -11,6 +12,7 @@ import android.os.Bundle
 import android.preference.PreferenceManager
 import android.util.AttributeSet
 import android.view.View
+import android.view.inputmethod.InputMethodManager
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
 import androidx.navigation.fragment.NavHostFragment
@@ -105,6 +107,8 @@ open class HomeActivity : AppCompatActivity() {
             navHost.navController.popBackStack(R.id.browserFragment, true)
             allSessionsRemoved = false
         }
+
+        showSoftwareKeyboardIfNecessary()
     }
 
     override fun onDestroy() {
@@ -140,6 +144,27 @@ open class HomeActivity : AppCompatActivity() {
         super.onBackPressed()
     }
 
+    override fun onPause() {
+        super.onPause()
+        hideSoftwareKeyboardIfNecessary()
+    }
+
+    private fun showSoftwareKeyboardIfNecessary() {
+        (getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager).apply {
+            currentFocus?.also {
+                this.showSoftInput(it, 0)
+            }
+        }
+    }
+
+    private fun hideSoftwareKeyboardIfNecessary() {
+        (getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager).apply {
+            currentFocus?.also {
+                this.hideSoftInputFromWindow(it.windowToken, 0)
+            }
+        }
+    }
+
     private fun handleCrashIfNecessary(intent: Intent?) {
         if (intent == null) { return }
         if (!Crash.isCrashIntent(intent)) { return }