Android的菜单选项上的复选框方向改变选中修复 [英] Android Menu Options checkboxes unchecked on orientation change fix

问题描述

在我的应用程序，当选项溢出菜单进行检查，然后将方向改变时，他们变得​​听之任之。任何方式解决这一问题？
我知道 onSavedInstance 应能帮助我在这里，但我不知道如何实现它在我的情况。

In my app, when options are checked in the overflow menu, then the orientation is changed, they become unchecked. Any way to fix this? I know onSavedInstance should be able to help me here, but I don't know how to implement it in my case.

下面是我的溢出复选框是如何在主要活动处理为例

Here's an Example of how my overflow checkboxes are handled in the main activity

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}



@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {


switch (item.getItemId()) {

case R.id.subtract_option:
    if (item.isChecked()){
        item.setChecked(false);
        subtractMode = false;

    } else{
        item.setChecked(true);
        subtractMode = true;
    }

    return true;

default:
    return super.onMenuItemSelected(featureId, item);

所以，我将如何贯彻落实 onSavedInstanceState 在这种情况下？

推荐答案

它与Android如何处理方向改变的事情。它实际上是杀死你的活动，并重新启动它。有两种方法来解决它。

It has to do with how Android handles orientation changes. It actually kills your activity and restarts it. There's two ways to fix it.

1）的onSaveInstanceState实施，编写所有状态的对象（包括复选框的值），并实施onRestoreInstanceState的逆过程。

1)Implement onSaveInstanceState, write all your state to an object (including the values of checkboxes) and implement onRestoreInstanceState to reverse the process.

2）添加机器人：configChanges =方向。这将停止压倒一切的行为。这也将打破布局的自动载，如果你有不同的景观ANDD纵向布局。

2)Add android:configChanges="orientation". This will stop the overriding behavior. It will also break the automatic reloading of layouts if you have separate landscape andd portrait layouts.

我推荐的路线2，如果你的没有了方向不同的布局。如果你这样做，你的应用程序很简单，我建议路线1.如果你需要和你的应用程序是复杂的你拧并在痛苦的世界。

I recommend route 2 if your don't have separate layouts for the orientations. If you do and your app is simple, I suggest route 1. If you need that and your app is complex you're screwed and in for a world of pain.

这篇关于Android的菜单选项上的复选框方向改变选中修复的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！