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本文链接：https://blog.csdn.net/seek_0380/article/details/70766283
背景：
调试使用一款800x1280分辨率的屏，客户希望横屏使用（1280x800），且没有旋转过程，看起来就是横屏显示一样。修改主要涉及几个方面，第一是LK阶段的图片，第二是开机动画的显示（/system/bin/bootanimation），第三是最终进入系统后的显示，且所有的显示过程无缝连接。
涉及的库文件：
/system/lib64/libsurfaceflinger.so
/system/framework/services.jar
/system/framework/framework-res.apk
/system/bin/bootanimation
Android显示子系统大致流程：
主要分为两个部分，LK部分和kernel独立。主要讲kernel部分。
显示驱动加载—>创建/dev/graphic/fb0à启动servicesurfaceflinger /system/bin/surfaceflinger
à启动servicebootanim /system/bin/bootanimation—>启动zygote和system-server进入Java
service zygote /system/bin/app_process64-Xzygote /system/bin --zygote --start-system-server进入Android系统—>启动各种servicemanager –>启动activity managerà启动luncher—>等待用户启动app。
涉及的文件路径：
开机动画的路径：vendor\qcom\proprietary\qrdplus\Extension\apps\BootAnimation\
更换开机动画：
C:\Users\binq>adb push X:\shaomingliang\android7.1\LA.UM.5.6\vendor\qcom\proprie
tary\qrdplus\Extension\apps\BootAnimation\bootanimation.zip /system/media/
surfaceflinger文件：
frameworks\native\services\surfaceflinger\DisplayDevice.cpp
frameworks\native\services\surfaceflinger\SurfaceFlinger.cpp
加载开机动画的代码：
frameworks\base\cmds\bootanimation\bootanimation_main.cpp
frameworks\base\cmds\bootanimation\BootAnimation.cpp
JAVA层代码：
frameworks/base/core/res/res/values/config.xml
frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
kernel部分代码：
kernel/msm-3.18/arch/arm/boot/dts/qcom/dsi-panel-nt35521s-kd101n66-40ni-k2-800p-video.dtsi（屏的配置文件）
device/qcom/msm8937_64/system.prop 添加属性
1、 修改LK阶段图片
高通使用splash.img存储LK的开机动画，在device/qcom/common/display/logo/logo.png
添加对应分辨率的图片，重新打包编译splash.img下载进去即可。
2、 修改kernel中屏的相关配置，
使屏旋转180度，这样在后面Android部分只需要旋转90度即可，不需要旋转270.旋转270有可能会遇到Android设置界面设置字体闪屏的问题。
在配置文件中添加：
qcom,mdss-dsi-panel-orientation = "180";
3、 开机动画横屏，
修改/system/bin/bootanimation（C++）
在frameworks\base\cmds\bootanimation\BootAnimation.cpp中添加：
@@ -286,7+286,22 @@ status_t BootAnimation::readyToRun() {
status_t status =SurfaceComposerClient::getDisplayInfo(dtoken, &dinfo);
if (status)
return -1;
+ //ALOGE("eliot BootAnimation::readyToRun111111\n");
+
+ char value[PROPERTY_VALUE_MAX];
+ property_get("persist.panel.orientation", value,"0");
+ int orient= atoi(value) / 90;
+
+ if(orient== 1 || orient == 3) {
+ inttemp = dinfo.h;
+ dinfo.h= dinfo.w;
+ dinfo.w= temp;
+ }
+ RectdestRect(dinfo.w, dinfo.h);
+ mSession->setDisplayProjection(dtoken, orient, destRect, destRect);
+
+ //ALOGE("eliot BootAnimation::readyToRun22222222\n");
// create the native surface
sp<SurfaceControl> control =session()->createSurface(String8("BootAnimation"),
dinfo.w, dinfo.h,PIXEL_FORMAT_RGB_565);
在device/qcom/msm8937_64/system.prop添加：
persist.panel.orientation=90 #bootanimation daemon会读取这个字符串进行旋转操作。
qemu.hw.mainkeys=0 #这个是虚拟按键
4、 JAVA层修改默认方向
frameworks/base/core/res/res/values/config.xml
修改：
---a/frameworks/base/core/res/res/values/config.xml
+++b/frameworks/base/core/res/res/values/config.xml
@@ -619,7 +619,7 @@
settings are omitted from the system UI. In certain situations we may
still use the accelerometer to determine the orientation, such as when
docked if the dock is configured to enable the accelerometer. -->
- <bool name="config_supportAutoRotation">true</bool>
+ <boolname="config_supportAutoRotation">false</bool>
<!-- If true, the screen can be rotated via the accelerometer in all4
rotations as the default behavior. -->
@@ -674,7 +674,7 @@
<!-- The number of degrees to rotate the display when the keyboard isopen.
A value of -1 means no change in orientation by default. -->
- <integername="config_lidOpenRotation">-1</integer>
+ <integername="config_lidOpenRotation">90</integer>
<!-- Indicate whether the lid state impacts the accessibility of
the physical keyboard. 0 means itdoesn't, 1 means it is accessible
修改
frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
--- a/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++b/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -6924,7 +6924,7 @@ public classPhoneWindowManager implements WindowManagerPolicy{
if (preferredRotation >=0) {
returnpreferredRotation;
}
- return Surface.ROTATION_0;
+ return Surface.ROTATION_90;
}
}
}
修改
frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
---a/frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
+++b/frameworks/base/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -553,7 +553,7 @@ public classWindowManagerService extends IWindowManager.Stub
/** All DisplayContents in the world, kept here */
SparseArray<DisplayContent> mDisplayContents = newSparseArray<>(2);
- int mRotation = 0;
+ int mRotation = 1;
int mLastOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
boolean mAltOrientation = false;
@@ -3857,7 +3857,7 @@ public classWindowManagerService extends IWindowManager.Stub
long ident = Binder.clearCallingIdentity();
try {
int req = getOrientationLocked();
- req =ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE; //add
+ //req =ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE; //add
if (req != mLastOrientation) {
mLastOrientation = req;
//send a message to Policyindicating orientation change to take
参考网站：http://blog.csdn.net/q1183345443/article/details/53068526
