Fix IllegalArgumentException

library/src/main/java/jp/co/recruit_lifestyle/android/floatingview/FloatingViewManager.java

@@ -26,6 +26,7 @@
 import android.support.annotation.DrawableRes;
 import android.support.annotation.IntDef;
 import android.support.annotation.NonNull;
+import android.support.v4.view.ViewCompat;
 import android.util.DisplayMetrics;
 import android.view.DisplayCutout;
 import android.view.HapticFeedbackConstants;
@@ -544,7 +545,7 @@ public void addViewToWindow(View view, Options options) {
  mWindowManager.addView(mFullscreenObserverView, mFullscreenObserverView.getWindowLayoutParams());
  mTargetFloatingView = floatingView;
  } else {
- mWindowManager.removeViewImmediate(mTrashView);
+ removeViewImmediate(mTrashView);
  }
  // 必ずトップに来て欲しいので毎回貼り付け
  mWindowManager.addView(mTrashView, mTrashView.getWindowLayoutParams());
@@ -559,7 +560,7 @@ private void removeViewToWindow(FloatingView floatingView) {
  final int matchIndex = mFloatingViewList.indexOf(floatingView);
  // 見つかった場合は表示とリストから削除
  if (matchIndex != -1) {
- mWindowManager.removeViewImmediate(floatingView);
+ removeViewImmediate(floatingView);
  mFloatingViewList.remove(matchIndex);
  }
 
@@ -576,17 +577,29 @@ private void removeViewToWindow(FloatingView floatingView) {
  * ViewをWindowから全て取り外します。
  */
  public void removeAllViewToWindow() {
- mWindowManager.removeViewImmediate(mFullscreenObserverView);
- mWindowManager.removeViewImmediate(mTrashView);
+ removeViewImmediate(mFullscreenObserverView);
+ removeViewImmediate(mTrashView);
  // FloatingViewの削除
  final int size = mFloatingViewList.size();
  for (int i = 0; i < size; i++) {
  final FloatingView floatingView = mFloatingViewList.get(i);
- mWindowManager.removeViewImmediate(floatingView);
+ removeViewImmediate(floatingView);
  }
  mFloatingViewList.clear();
  }
 
+ /**
+ * Safely remove the View (issue #89)
+ *
+ * @param view {@link View}
+ */
+ private void removeViewImmediate(View view) {
+ if (!ViewCompat.isAttachedToWindow(view)) {
+ return;
+ }
+ mWindowManager.removeViewImmediate(view);
+ }
+
  /**
  * Find the safe area of DisplayCutout.
  *