Add KeyboardHelper.kt

app/src/main/java/chat/rocket/android/helper/KeyboardHelper.kt

+package chat.rocket.android.helper
+
+import android.graphics.Rect
+import android.view.View
+
+object KeyboardHelper {
+
+    /**
+     * Returns true if the soft keyboard is shown, false otherwise.
+     *
+     * @param rootView The rootView of a view (e.g. an EditText).
+     * @return true if the soft keyboard is shown, false otherwise.
+     */
+    fun isSoftKeyboardShown(rootView: View): Boolean {
+        val softKeyboardHeight = 100
+        val rect = Rect()
+
+        rootView.getWindowVisibleDisplayFrame(rect)
+
+        val dm = rootView.resources.displayMetrics
+        val heightDiff = rootView.bottom - rect.bottom
+        return heightDiff > softKeyboardHeight * dm.density
+    }
+}
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