优化判断 Activity 是否可用的代码写法

Author: getActivity

library/src/main/java/com/hjq/toast/ToastStrategy.java

@@ -105,8 +105,7 @@ public IToast createToast(ToastParams params) {
                 Settings.canDrawOverlays(mApplication)) {
             // 如果有悬浮窗权限，就开启全局的 Toast
             toast = new GlobalToast(mApplication);
-        } else if (!params.crossPageShow && foregroundActivity != null && !foregroundActivity.isFinishing() &&
-            (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR1 && !foregroundActivity.isDestroyed())) {
+        } else if (!params.crossPageShow && isActivityAvailable(foregroundActivity)) {
             // 如果没有悬浮窗权限，就开启一个依附于 Activity 的 Toast
             toast = new ActivityToast(foregroundActivity);
         } else if (Build.VERSION.SDK_INT == Build.VERSION_CODES.N_MR1) {
@@ -314,4 +313,22 @@ protected boolean areNotificationsEnabled(Context context) {
     protected Activity getForegroundActivity() {
         return ActivityStack.getInstance().getForegroundActivity();
     }
+
+    /**
+     * Activity 是否可用
+     */
+    protected boolean isActivityAvailable(Activity activity) {
+        if (activity == null) {
+            return false;
+        }
+
+        if (activity.isFinishing()) {
+            return false;
+        }
+
+        if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR1) {
+            return !activity.isDestroyed();
+        }
+        return true;
+    }
 }