我可以强制微调的下拉认为留可见取向的变化？ [英] Can I force the dropdown view of a spinner to stay visible on orientation changes?
问题描述
我不知道这是否是从标题清楚我问，所以这里有一些步骤来重现（假设你有一个微调的布局）：
I don't know if it's clear from the title what I asked, so here are some steps to reproduce (assuming you have a layout with a spinner):
- 打开微调>下拉列表中点击。
- 从纵向到横向（反之亦然）>列表被关闭旋转设备。
我的问题是，我想保持旋转设备后打开列表。我知道，这通常是可能的，如果重写 onConfigurationChanged ，但我已经定义为横向模式不同的布局，所以在我onConfigurationChanged方法，我必须调用的setContentView 并设置适配器对于景观微调，从而关闭了在纵向模式下打开的下拉菜单视图。
My problem is that I would like to keep the list opened after rotating the device. I know that this is usually possible if overriding onConfigurationChanged, but I have defined a different layout for landscape mode, so in my onConfigurationChanged method I have to call setContentView and set the adapter for the landscape spinner, which closes the dropdown view that was opened in portrait mode.
有没有一种方法，我可以从关闭或者迫使其旋转设备后展现prevent的下拉列表？
Is there a way I could prevent the dropdown list from closing or perhaps forcing it to show after rotating the device?
推荐答案
我发现了一个非常难看的解决这个（以下简称行动发生在地方的 onConfigurationChanged 法）：
I found a very ugly solution to this (the 'action' takes place in the onConfigurationChanged method):
-
在调用的setContentView ，检查是否显示的下拉菜单视图的（*）如果是这样，保存当前的微调选择的位置（
INT POS = spinner.getSelectedItemPosition（））。
Before calling setContentView, check if the dropdown view is shown (*) and if so, save the position that is currently selected in the spinner (
int pos = spinner.getSelectedItemPosition()).
在调用后的的setContentView 并设置微调适配器，如果下拉视图在步骤1中，强制下拉列表视图通过调用显示的 performClick 的微调：
After calling setContentView and setting the spinner adapter, if the dropdown view was shown in step 1, force the dropdown view to show by calling performClick on the spinner:
spinner.setSelection(pos);// this way we make sure that the same item
// remains selected after rotating the device
spinner.performClick(); //show the dropdown view
（*）检查是否已显示的下拉视图是棘手的部分。我还没有发现（还），让我知道了下拉列表视图是否显示，所以我不得不做以下的方法：
(*) Checking if the dropdown view is shown is the trickier part. I haven't found (yet) a method that lets me know whether the dropdown view is shown, so I had to do the following:
-
按住微调的pressed状态布尔变量（命名，例如， isClicked ）。
设置的 onTouchListener 作为微调，并在 onTouch 方式将 isClicked 以真（攻微调时，dropdwon视图中打开，所以 isClicked ==真表示下拉图如图）。
Set an onTouchListener for the spinner and in the onTouch method set isClicked to true (when tapping the spinner, the dropdwon view opens, so isClicked == true means that the dropdown view is shown).
覆盖的onkeydown 或的onkeyup 并在后退按钮是pressed，如果 isClicked 为真，将其设置为false （我假定pressing回来的 isClicked ==真表示关闭下拉列表视图）。
Override onKeyDown or onKeyUp and when back button is pressed, if isClicked is true, set it to false (I assumed that pressing back with isClicked==true means closing the dropdown view).
使用的值 isClicked 在 onConfigurationChanged 方法来检查是否显示的下拉视图。
Use the value of isClicked in onConfigurationChanged method to check if the dropdown view is shown.
就像我说的，这是一个丑陋的修复，但它是唯一一个我能想出直到现在。如果有人有其他想法，请张贴。
Like I said, it's an ugly fix, but it's the only one I could come up with until now. If anybody has other ideas, please post them.
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