如何在布局/绘图发生之前更改屏幕方向？

发布于 2024-12-06 05:32:45 字数 700 浏览 1 评论 0原文

我想在子活动启动时设置其方向。方向必须在运行时设置，而不是在 XML 中。所以我把它的代码放在onCreate()中。我也有

android:configChanges="orientation|screenSize"

该活动的清单。但是当活动启动时，它首先以错误的方向绘制屏幕，然后进行更改。如何消除这种闪烁？

它与此线程有点相关：如何定义创建 Activity 之前的屏幕方向？。另外，我知道我的活动只启动一次，因为我正在处理配置更改。

这是我在 onCreate 中的代码：

SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
orientation = sharedPref.getString("orientation_pref", "Auto");
setOrientation(orientation);

setContentView(R.layout.grid);

由于某种原因，它在加载 R.layout 文件后更改了方向。

原文

I want to set the orientation of a subactivity when it starts. The orientation has to be set in run-time and not in XML. So I put the code for it in onCreate(). I also have

android:configChanges="orientation|screenSize"

in the manifest for the activity. But when the activity starts, it draws the screen in the wrong orientation first, then does the change. How do I eliminate this flikering?

It's kinda related to this thread: how to define the screen orientation before the activity is created? . Also, I know my activity only starts once since I am handling the config changes.

Here's my code in onCreate:

SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
orientation = sharedPref.getString("orientation_pref", "Auto");
setOrientation(orientation);

setContentView(R.layout.grid);

For some reason it changes the orientation after it loads the R.layout file.

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成熟的代价 2024-12-13 05:32:45

只需在 android-manifest xml 中定义方向

 <activity android:name=".MyActivity"
           android:screenOrientation="portrait">

如果您在 Activity 之间移动并且因此而出现闪烁，请将此 xml 属性添加到您的 Activity

 android:launchMode="singleTask"

尝试在 onCreate 中使用用户首选项 setContentView

 SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
 boolean portrait = prefs.getBoolean(KEY_ORIENTATION, true);
 if (portrait) {
     setContentView(R.layout.myactivity);
 else {
     setContentView(R.layout-land.myactivity);
 }

Simply define the orientation in your android-manifest xml

 <activity android:name=".MyActivity"
           android:screenOrientation="portrait">

If you are moving between Activities and you're get flickering due to that, add this xml attribute to your activity

 android:launchMode="singleTask"

Try setContentView using user pref in onCreate

 SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
 boolean portrait = prefs.getBoolean(KEY_ORIENTATION, true);
 if (portrait) {
     setContentView(R.layout.myactivity);
 else {
     setContentView(R.layout-land.myactivity);
 }

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