Android横竖屏切换的几种方式
最近在搞一个嵌入式的阉割版的Android横屏切换竖屏的问题，因为阉割严重所以在PhoneWindowManager里做处理的方案不适用，网上查资料查到了个系统属性ro.sf.hwrotation，初始值为0，只要根据旋转角度90/180/270做相应的设置就可以了，从开发板上试的话发现屏幕切换后触摸的焦点是不对的，但因是在嵌入式小板上只做显示使用，没有触摸的功能，所以说只设置这个属性就可以了。如有其他需求请往下看▼
下面转载了一位小哥收集的文章，横屏切换竖屏的几种方案都有，原文地址：https://www.cnblogs.com/liulaolaiu/p/11744540.html
android如何改变系统默认横竖屏方向
http://blog.csdn.net/abc19842008/article/details/7543559
如何改变android默认的横竖屏，修改源码一个地方就可以了。
public int rotationForOrientationLw(int orientation, int lastRotation,
boolean displayEnabled) {
if (mPortraitRotation < 0) {
// Initialize the rotation angles for each orientation once.
Display d = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
if (d.getWidth() > d.getHeight()) {
mPortraitRotation = Surface.ROTATION_90;
mLandscapeRotation = Surface.ROTATION_0;
mUpsideDownRotation = Surface.ROTATION_270;
mSeascapeRotation = Surface.ROTATION_180;
} else {
mPortraitRotation = Surface.ROTATION_0;
mLandscapeRotation = Surface.ROTATION_90;
mUpsideDownRotation = Surface.ROTATION_180;
mSeascapeRotation = Surface.ROTATION_270;
}
}
{
Log.i(TAG, "MediaPlayer.is not PlayingVideo");
synchronized (mLock) {
switch (orientation) {
case ActivityInfo.SCREEN_ORIENTATION_PORTRAIT:
//always return portrait if orientation set to portrait
//return mPortraitRotation;
return mUpsideDownRotation;
case ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE:
//always return landscape if orientation set to landscape
return mLandscapeRotation;
case ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT:
//always return portrait if orientation set to portrait
//return mUpsideDownRotation;
return mPortraitRotation;
case ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE:
//always return seascape if orientation set to reverse landscape
return mSeascapeRotation;
case ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE:
//return either landscape rotation based on the sensor
mOrientationListener.setAllow180Rotation(
isLandscapeOrSeascape(Surface.ROTATION_180));
return getCurrentLandscapeRotation(lastRotation);
case ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT:
mOrientationListener.setAllow180Rotation(
!isLandscapeOrSeascape(Surface.ROTATION_180));
return getCurrentPortraitRotation(lastRotation);
}
mOrientationListener.setAllow180Rotation(
orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR
|| orientation == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
// case for nosensor meaning ignore sensor and consider only lid
// or orientation sensor disabled
//or case.unspecified
if (mLidOpen) {
return mLidOpenRotation;
} else if (mDockMode == Intent.EXTRA_DOCK_STATE_CAR && mCarDockRotation >= 0) {
return mCarDockRotation;
} else if (mDockMode == Intent.EXTRA_DOCK_STATE_DESK && mDeskDockRotation >= 0) {
return mDeskDockRotation;
} else {
if (useSensorForOrientationLp(orientation)) {
return mOrientationListener.getCurrentRotation(lastRotation);
}
return Surface.ROTATION_0;
}
}
}
}
修改上面倒数一行代码把return Surface.ROTATION_0改为你要的方向，记得这个要和上面的匹配，宽高不同，Surface.ROTATION_0也不同。因为代码开头就有
if (mPortraitRotation < 0) {
// Initialize the rotation angles for each orientation once.
Display d = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
if (d.getWidth() > d.getHeight()) {
mPortraitRotation = Surface.ROTATION_90;
mLandscapeRotation = Surface.ROTATION_0;
mUpsideDownRotation = Surface.ROTATION_270;
mSeascapeRotation = Surface.ROTATION_180;
} else {
mPortraitRotation = Surface.ROTATION_0;
mLandscapeRotation = Surface.ROTATION_90;
mUpsideDownRotation = Surface.ROTATION_180;
mSeascapeRotation = Surface.ROTATION_270;
}
}
调试android记录 —— 屏幕改为竖屏
http://hi.baidu.com/jsxhxcq/item/960ca20607ed24e1359902d2
在调试android时，项目需要将屏幕竖屏，而且没有传感器。
按照网上的要求 在 build/target/product/core.mk 中
PRODUCT_POLICY := android.policy_phone //mid 改为phone
但是改完没有任何反应。随就追踪下去
1. 系统启动后 执行 performEnableScreen()
performEnableScreen() --> mPolicy.enableScreenAfterBoot();->
windowmanagerservice.java
public void enableScreenAfterBoot() {
synchronized(mWindowMap) {
if (mSystemBooted) {
return;
}
mSystemBooted = true;
}
2. 在其函数中调用updateRotation（）；
public void enableScreenAfterBoot() {
readLidState();
updateRotation(Surface.FLAGS_ORIENTATION_ANIMATION_DISABLE);
}
void updateRotation(int animFlags) {
mPowerManager.setKeyboardVisibility(mLidOpen);
int rotation = Surface.ROTATION_0;
if (mLidOpen) {
rotation = mLidOpenRotation;
} else if (mDockState == Intent.EXTRA_DOCK_STATE_CAR && mCarDockRotation >= 0) {
rotation = mCarDockRotation;
} else if (mDockState == Intent.EXTRA_DOCK_STATE_DESK && mDeskDockRotation >= 0) {
rotation = mDeskDockRotation;
}
//if lid is closed orientation will be portrait
try {
//set orientation on WindowManager
mWindowManager.setRotation(rotation, true,
mFancyRotationAnimation | animFlags);
} catch (RemoteException e) {
// Ignore
}
}3. setRotation（）函数在 windowmanagerservices.java 中
static final boolean DEBUG_ORIENTATION = true; //打开调试信息
设置旋转函数， 下面调用关系
setRotation() - > setRotationUnchecked() - > setRotationUncheckedLocked（）-> rotationForOrientationLw()
if (useSensorForOrientationLp(orientation)) {
// If the user has enabled auto rotation by default, do it.
int curRotation = mOrientationListener.getCurrentRotation();
return curRotation >= 0 ? curRotation : lastRotation;
}
让所有应用都横屏显示
http://blog.csdn.net/knock/article/details/7629585
frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
public int rotationForOrientationLw(int orientation, int lastRotation,
boolean displayEnabled) {
// Initialize the rotation angles for each orientation once.
Display d = ((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
if (d.getWidth() > d.getHeight()) {
mPortraitRotation = Surface.ROTATION_0; //jeff. ROTATION_90;
mLandscapeRotation = Surface.ROTATION_0;
mUpsideDownRotation = Surface.ROTATION_90; //jeff. 270;
mSeascapeRotation = Surface.ROTATION_180;
}
android屏幕旋转在framework中的修改
http://blog.csdn.net/xulinguestc/article/details/6435957
在framework中修改，可以随意修改屏幕0°指向的方向，其实也是framework层做的映射。 修改HAL层来修改屏幕0°指向的方向应该也是可以的，还没有试过， 估计会复杂点，应该要修改触摸屏的坐标， 触摸键值映射表， 比较麻烦，其实没什么必要，修改framework层就可以搞定了。
平板电脑一般是默认横屏， 竖屏的APP程序， 会自动旋转90°， 由于是顺时针转90°， 需要改为逆时针转90°； 也就是要把portrait改逆时针转90°，这样就和手机一致，兼容很多gsensor游戏， 修改点如下：
PhoneWindowManager.java(//192.168.1.4/opt/android_froyo_smdk/frameworks/policies/base/phone/com/android/internal/policy/impl)
public int rotationForOrientationLw(int orientation, int lastRotation,
boolean displayEnabled) {
if (mPortraitRotation < 0) {
// Initialize the rotation angles for each orientation once.
Display d =((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))
.getDefaultDisplay();
if (d.getWidth() > d.getHeight()) {
mPortraitRotation = Surface.ROTATION_270;//Surface.ROTATION_90;
mLandscapeRotation =Surface.ROTATION_0;
} else {
mPortraitRotation =Surface.ROTATION_0;
mLandscapeRotation = Surface.ROTATION_270;//Surface.ROTATION_90;
}
}
以下是参考文章------------------------------------------------------------------------------------------------------
本行实现以后才发现，google在1.5到2.2这个过程中改进了很多，1.5修改竖屏比较麻烦，而2.2是相当的容易！
其实基本上google将之前版本的默认为竖屏的做法进行了改进，不需要再花费更多力气在屏幕的默认横竖切换上面。1.还是kernel竖屏，可以显示到屏幕出现"A N D R O I D"字样
启动参数里加入fbcon=rotate:1 (0:正常屏; 1:顺时钟转90度; 2:转180度; 3:顺时钟转270度;)
最后生成的autoconf.h里有类似项：
#define CONFIG_CMDLINE "console=ttySAC0,115200 fbcon=rotate:1"此项的解析在$(kernel)/drivers/video/console/fbcon.c
static int __init fb_console_setup(char *this_opt);
只是去初始化变量initial_rotation，然后initial_rotation会传递给其他需要的结构。
要选上：Device Drivers -> Graphics support -> Console display driver support ->Framebuffer Console support -> Framebuffer Console Rotation
注意：参考$(kernel)/documentation/fb/fbcon.txt2.android OS旋转屏幕
froyo中已经相当容易，仅修改一处：
frameworks/base/libs/surfaceflinger/SurfaceFlinger.cpp
void GraphicPlane::setDisplayHardware(DisplayHardware *hw)
{
mHw = hw; // initialize the display orientation transform.
// it's a constant that should come from the display driver.
// int displayOrientation = ISurfaceComposer::eOrientationDefault;
int displayOrientation = ISurfaceComposer::eOrientation90; //jeff.
。。。
}
或者只在init.rc中增加一项：
setprop ro.sf.hwrotation 90就这么简单的一修改，就可以全程竖屏显示了！