Android 设定横屏，禁止屏幕旋转，Activity重置 [更新视频播放器相关]

最新推荐文章于 2024-08-30 18:46:56 发布

转载最新推荐文章于 2024-08-30 18:46:56 发布 · 433 阅读

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#移动开发

本文介绍如何在Android应用中控制屏幕方向，包括通过AndroidManifest.xml文件和setRequestedOrientation方法设置横屏或竖屏，并讨论如何避免屏幕旋转导致的Activity重置问题。

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1. 设定屏幕方向

当指定了屏幕的方向后（非SCREEN_ORIENTATION_UNSPECIFIED），屏幕就不会自己主动的旋转了

有2中方式控制屏幕方向：

1.1 改动AndroidManifest.xml

在AndroidManifest.xml的activity中增加:

横屏：

android:screenOrientation=”landscape”

竖屏：

android:screenOrientation=”portrait”

1.2 setRequestedOrientation

横屏：

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

竖屏：

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

ActivityInfo:

int	SCREEN_ORIENTATION_BEHIND	Constant corresponding to behind in the screenOrientation attribute.
int	SCREEN_ORIENTATION_FULL_SENSOR	Constant corresponding to fullSensor in the screenOrientation attribute.
int	SCREEN_ORIENTATION_FULL_USER	Constant corresponding to fullUser in the screenOrientation attribute.
int	SCREEN_ORIENTATION_LANDSCAPE	Constant corresponding to landscape in the screenOrientation attribute.
int	SCREEN_ORIENTATION_LOCKED	Constant corresponding to locked in the screenOrientation attribute.
int	SCREEN_ORIENTATION_NOSENSOR	Constant corresponding to nosensor in the screenOrientation attribute.
int	SCREEN_ORIENTATION_PORTRAIT	Constant corresponding to portrait in the screenOrientation attribute.
int	SCREEN_ORIENTATION_REVERSE_LANDSCAPE	Constant corresponding to reverseLandscape in the screenOrientation attribute.
int	SCREEN_ORIENTATION_REVERSE_PORTRAIT	Constant corresponding to reversePortrait in the screenOrientation attribute.
int	SCREEN_ORIENTATION_SENSOR	Constant corresponding to sensor in the screenOrientation attribute.
int	SCREEN_ORIENTATION_SENSOR_LANDSCAPE	Constant corresponding to sensorLandscape in the screenOrientation attribute.
int	SCREEN_ORIENTATION_SENSOR_PORTRAIT	Constant corresponding to sensorPortrait in the screenOrientation attribute.
int	SCREEN_ORIENTATION_UNSPECIFIED	Constant corresponding to unspecified in the screenOrientation attribute.
int	SCREEN_ORIENTATION_USER	Constant corresponding to user in the screenOrientation attribute.
int	SCREEN_ORIENTATION_USER_LANDSCAPE	Constant corresponding to userLandscape in the screenOrientation attribute.
int	SCREEN_ORIENTATION_USER_PORTRAIT	Constant corresponding to userPortrait in the screenOrientation attribute.

2. 禁止屏幕旋转后重置Activity

屏幕旋转后会强制调用Activity.onCreate方法，所以会重置Activity

禁止方法：

改动AndroidManifest.xml

android:configChanges=”orientation”

近期在做Android的播放器。遇到採用以上方法后，仍然出现屏幕旋转后触发Activity.onCreate，经查阅资料后，发现须要加入screenSize处理

详细代码为：

android:configChanges="orientation|keyboardHidden|screenSize"

禁止重置Activity会造成Screen的宽高颠倒，须要手动修正。