Android 2.3 Rotation and Orientation

最新推荐文章于 2024-09-04 21:01:10 发布

柯可客

最新推荐文章于 2024-09-04 21:01:10 发布

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文章标签： android service frameworks server system class

本文详细解析了Android系统中屏幕旋转的实现过程，包括初始化服务、设置屏幕方向及获取当前方向等关键步骤。从源码层面介绍了Activity、WindowManagerService及SurfaceFlinger之间的交互。

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Service:
28 window: [android.view.IWindowManager]
38 activity: [android.app.IActivityManager]
46 SurfaceFlinger: [android.ui.ISurfaceComposer]

1) Init services
system/core/init/init.c
restart_processes()@system/core/init/init.c
service_start()
execve() 【service zygote /system/bin/app_process -Xzygote/system/bin --zygote--start-system-server init.rc】
main()@frameworks\base\cmds\app_main.cpp
runtime.start("com.android.internal.os.ZygoteInit",startSystemServer);
startSystemServer()@com.android.internal.os.ZygoteInit
main()@com/android/server/SystemServer
init1()
android_server_SystemServer_init1()@com_android_server_SystemServer.cpp
system_init() {SurfaceFlinger::instantiate()}
runtime->callStatic("com/android/server/SystemServer", "init2");
init2()@com/android/server/SystemServer
new ServerThread()
ActivityManagerService.main()
wm = WindowManagerService.main()
new WMThread()@WindowManagerService.java
new WindowManagerService()
{ final WindowManagerPolicy mPolicy = PolicyManager.makeNewWindowManager();
PolicyManager.makeNewWindowManager()
makeNewWindowManager()@com.android.internal.policy.impl.Policy
return new PhoneWindowManager
{ class MyOrientationListener extends WindowOrientationListener }
}

2) Set Orientation
WindowOrientationListener.java
onSensorChanged() [ROTATION_XXX -> Surface.ROTATION_XXX]
onOrientationChanged(Surface.ROTATION_XXX)
setRotation()@WindowManagerService
setRotationUnchecked()
setRotationUncheckedLocked()
Surface::setOrientation()
setOrientation(Surface.ROTATION_XXX)@Surface.java
Surface_setOrientation()@android_view_Surface.cpp
setOrientation()@SurfaceComposerClient.cpp
SurfaceFlinger::setOrientation()
setTransactionFlags()@SurfaceFlinger.cpp
handleTransaction()@SurfaceFlinger.cpp
handleTransactionLocked()@SurfaceFlinger.cpp
dcblk->orientation = orientation;
GraphicPlane::setOrientation(ISurfaceComposer::eOrientation_XXX)@SurfaceFlinger.cpp
GraphicPlane::orientationToTransfrom()[ISurfaceComposer::eOrientationXXX -> Transform::ROT_XXX]

3) Get Orientation
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
getWindowManager().getDefaultDisplay().getOrientation()@Activity.java
getSystemService(Context.WINDOW_SERVICE)@Activity.java [== getWindowManager()@Activity.java]
{return mWindowManager
attach()@androi.app.Activity
mWindow = PolicyManager.makeNewWindow(this)
mWindow.setWindowManager(null)
wm = WindowManagerImpl.getDefault();
return new WindowManagerImpl()
mWindowManager = new LocalWindowManager(wm);
}
getDefaultDisplay()@android.view.WindowManagerImpl
return new Display()
init()@android.view.Display
android_view_Display_init()@android_view_Display.cpp
SurfaceComposerClient.cpp:: getDisplayInfo()
get_cblk()
ISurfaceComposer-> getCblk()
getCblk()@SurfaceFlinger.cpp (SurfaceFlinger: [android.ui.ISurfaceComposer])
readyToRun()
const GraphicPlane& plane(graphicPlane(dpy));
const DisplayHardware& hw = plane.displayHardware();
dcblk->orientation = ISurfaceComposer::eOrientationDefault;
getOrientation()@android.view.Display
android_view_Display_getOrientation()@android.view.Display
SurfaceComposerClient::getDisplayOrientation()
get_cblk()
return dcblk->orientation

WindowOrientationListener.java
private static final int ROTATION_0 = 0;
private static final int ROTATION_90 = 1;
private static final int ROTATION_270 = 2;
private static final int ROTATION_180 = 3;

Surface.java
public static final int ROTATION_0 = 0;
public static final int ROTATION_90 = 1;
public static final int ROTATION_180 = 2;
public static final int ROTATION_270 = 3;

ISurfaceComposer.h
enum {
eOrientationDefault = 0,
eOrientation90 = 1,
eOrientation180 = 2,
eOrientation270 = 3,
eOrientationSwapMask = 0x01
};

Transform.h
enum orientation_flags {
ROT_0 = 0x00000000,
FLIP_H = HAL_TRANSFORM_FLIP_H,
FLIP_V = HAL_TRANSFORM_FLIP_V,
ROT_90 = HAL_TRANSFORM_ROT_90,
ROT_180 = FLIP_H|FLIP_V,
ROT_270 = ROT_180|ROT_90,
ROT_INVALID = 0x80

};

getRequestedOrientation()@Activity.java
ActivityManagerNative.getDefault().getRequestedOrientation()
ServiceManager.getService("activity").asInterface()
getRequestedOrientation()@ActivityManagerService.java
getAppOrientation()@WindowManagerService
findAppWindowToken()
getAppOrientation()
return wtoken.requestedOrientation;

setRequestedOrientation()@Activity.java
ActivityManagerNative.getDefault().setRequestedOrientation()
ServiceManager.getService("activity").asInterface()
setRequestedOrientation()@ActivityManagerService.java
setAppOrientation()@WindowManagerService
findAppWindowToken()
setAppOrientation()
wtoken.requestedOrientation = requestedOrientation;
updateOrientationFromAppTokens()@WindowManagerService
setRotationUncheckedLocked()

Surface.setOrientation()

http://blog.youkuaiyun.com/watchnight/article/details/6701260