android如何改变系统默认横竖屏方向

http://blog.csdn.net/wh_19910525/article/details/37963375

/article/9105854.html

如何改变android默认的横竖屏，修改源码一个地方就可以了。

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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

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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

/article/2727920.html

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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

/article/2883767.html

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：

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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！