android4.0强制横屏竖屏

方法一：android4.0/frameworks/base/services/java/com/android/server/wm/WindowManagerService.java

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1. int computeForcedAppOrientationLocked() {  
2.        int req = getOrientationFromWindowsLocked();  
3.        if (req == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED) {  
4.            req = getOrientationFromAppTokensLocked();  
5.        }  
6.   
7.        // req = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE; //强制横屏0度  
8.   
9.    // req = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT; //强制竖屏左转90度  
10.   
11.        return req;  
12.    }  

方法二： (此种方法最好用)
android4.0/frameworks/base/services/surfaceflinger/SurfaceFlinger.cpp

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1. void GraphicPlane::setDisplayHardware(DisplayHardware *hw)  
2. {  
3.     mHw = hw;  
4.   
5.     // initialize the display orientation transform.  
6.   
7.     // it's a constant that should come from the display driver.  
8.   
9.     int displayOrientation = ISurfaceComposer::eOrientationDefault;  
10.     char property[PROPERTY_VALUE_MAX];  
11.     if (property_get("ro.sf.hwrotation", property, NULL) > 0) {  
12.         //displayOrientation  
13.   
14.         switch (atoi(property)) {  
15.         case 0:  
16.             displayOrientation = ISurfaceComposer::eOrientationDefault;  
17.             break;  
18.         case 90:  
19.             displayOrientation = ISurfaceComposer::eOrientation90;  
20.             break;  
21.         case 180:  
22.             displayOrientation = ISurfaceComposer::eOrientation180;  
23.             break;  
24.         case 270:  
25.             displayOrientation = ISurfaceComposer::eOrientation270;  
26.             break;  
27.         }  
28.     }  
29.     /* 强制旋转90度 */  
30.     displayOrientation = ISurfaceComposer::eOrientation90;  
31.   
32.     const float w = hw->getWidth();  
33.     const float h = hw->getHeight();  
34.     GraphicPlane::orientationToTransfrom(displayOrientation, w, h,  
35.             &mDisplayTransform);  
36. }  

方法三：

修改device.mk中的ro.sf.hwrotation的值为90，或在init.rc中增加一行：setprop ro.sf.hwrotation 90