Fix issue with soft keyboard not showing from time to time on Android (…

…#152)

android/src/main/java/com/swmansion/rnscreens/Screen.java

@@ -1,16 +1,14 @@
 package com.swmansion.rnscreens;
 
-import androidx.annotation.Nullable;
-import androidx.fragment.app.Fragment;
-
 import android.annotation.SuppressLint;
+import android.content.Context;
 import android.graphics.Paint;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.animation.Animation;
-import android.view.animation.AnimationUtils;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.TextView;
 
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
@@ -63,6 +61,22 @@ public void onDestroy() {
     }
   }
 
+  private static OnAttachStateChangeListener sShowSoftKeyboardOnAttach = new OnAttachStateChangeListener() {
+
+    @Override
+    public void onViewAttachedToWindow(View view) {
+      InputMethodManager inputMethodManager =
+              (InputMethodManager) view.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+      inputMethodManager.showSoftInput(view, 0);
+      view.removeOnAttachStateChangeListener(sShowSoftKeyboardOnAttach);
+    }
+
+    @Override
+    public void onViewDetachedFromWindow(View view) {
+
+    }
+  };
+
   private final Fragment mFragment;
   private final EventDispatcher mEventDispatcher;
   private @Nullable ScreenContainer mContainer;
@@ -88,6 +102,27 @@ protected void onDetachedFromWindow() {
     clearDisappearingChildren();
   }
 
+  @Override
+  protected void onAttachedToWindow() {
+    super.onAttachedToWindow();
+    // This method implements a workaround for RN's autoFocus functionality. Because of the way
+    // autoFocus is implemented it sometimes gets triggered before native text view is mounted. As
+    // a result Android ignores calls for opening soft keyboard and here we trigger it manually
+    // again after the screen is attached.
+    View view = getFocusedChild();
+    if (view != null) {
+      while (view instanceof ViewGroup) {
+        view = ((ViewGroup) view).getFocusedChild();
+      }
+      if (view instanceof TextView) {
+        TextView textView = (TextView) view;
+        if (textView.getShowSoftInputOnFocus()) {
+          textView.addOnAttachStateChangeListener(sShowSoftKeyboardOnAttach);
+        }
+      }
+    }
+  }
+
   /**
    * While transitioning this property allows to optimize rendering behavior on Android and provide
    * a correct blending options for the animated screen. It is turned on automatically by the container

android/src/main/java/com/swmansion/rnscreens/ScreenStack.java

@@ -8,8 +8,6 @@
 import java.util.HashSet;
 import java.util.Set;
 
-import static com.swmansion.rnscreens.Screen.StackAnimation.*;
-
 public class ScreenStack extends ScreenContainer {
 
   private final ArrayList<Screen> mStack = new ArrayList<>();