Android 8.0系统默认横屏显示(无G-sensor)

MTK

1.添加宏控制

• device/mediateksample/xxxx/system.prop

// add start
persist.panel.orientation=0
// add end

2.开机动画横屏显示

• frameworks/base/cmds/bootanimation/BootAnimation.cpp

status_t BootAnimation::readyToRun() {
	mAssets.addDefaultAssets();

    sp<IBinder> dtoken(SurfaceComposerClient::getBuiltInDisplay(
            ISurfaceComposer::eDisplayIdMain));
    DisplayInfo dinfo;
    status_t status = SurfaceComposerClient::getDisplayInfo(dtoken, &dinfo);
    if (status)
        return -1;
        
    // add start   
    int defaultOrientation = 0;
    char property[PROPERTY_VALUE_MAX];
    property_get("persist.panel.orientation", property, "0");
    defaultOrientation = atoi(property)/90;

    // create the native surface
    sp<SurfaceControl> control = session()->createSurface(String8("BootAnimation"),
            (defaultOrientation ==1 || defaultOrientation==3) ?dinfo.h:dinfo.w, 
            (defaultOrientation ==1 || defaultOrientation==3) ?dinfo.w:dinfo.h, PIXEL_FORMAT_RGB_565);

    if (defaultOrientation==1 || defaultOrientation==3){
       Rect destRect(dinfo.h, dinfo.w);
       mSession->setDisplayProjection(dtoken, defaultOrientation, destRect, destRect);
    }
    // add end

3.初始化方向

• frameworks/native/services/surfaceflinger/DisplayDevice.cpp

	// add start
	int defaultOrientation = 0;
	char property[PROPERTY_VALUE_MAX];
    property_get("persist.panel.orientation", property, "0");
    defaultOrientation = atoi(property);
    switch(defaultOrientation) {
        case 0:
            defaultOrientation = DisplayState::eOrientationDefault;
            break;
        case 90:
            defaultOrientation = DisplayState::eOrientation90;
            break;
        case 180:
            defaultOrientation = DisplayState::eOrientation180;
            break;
        case 270:
            defaultOrientation = DisplayState::eOrientation270;
            break;
        default:
            defaultOrientation = DisplayState::eOrientationDefault;
            break;
    }
    //add end
    // initialize the display orientation transform.
   // setProjection(DisplayState::eOrientationDefault, mViewport, mFrame);
    setProjection(defaultOrientation, mViewport, mFrame); // modify

    if (useTripleFramebuffer) {
        surface->allocateBuffers();
    }
}

4.上层方向修改

• frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

	//add start
	private int mDefaultOrientation = Surface.ROTATION_0;
	
	public void setInitialDisplaySize(Display display, int width, int height, int density) {
        // This method might be called before the policy has been fully initialized
        // or for other displays we don't care about.
        if (mContext == null || display.getDisplayId() != Display.DEFAULT_DISPLAY) {
            return;
        }
        mDisplay = display;
        ...
        mForceDefaultOrientation = longSizeDp >= 960 && shortSizeDp >= 720 &&
                res.getBoolean(com.android.internal.R.bool.config_forceDefaultOrientation) &&
                // For debug purposes the next line turns this feature off with:
                // $ adb shell setprop config.override_forced_orient true
                // $ adb shell wm size reset
                !"true".equals(SystemProperties.get("config.override_forced_orient"));
                
        //add start
        String defaultOrientation = SystemProperties.get("persist.panel.orientation", "0");
        if("0".equals(defaultOrientation)) {
            mDefaultOrientation = Surface.ROTATION_0;
        } else if("90".equals(defaultOrientation)) {
            mDefaultOrientation = Surface.ROTATION_90;
        } else if("180".equals(defaultOrientation)) {
            mDefaultOrientation = Surface.ROTATION_180;
        } else if("270".equals(defaultOrientation)) {
            mDefaultOrientation = Surface.ROTATION_270;
        } else {
            mDefaultOrientation = Surface.ROTATION_0;
        }
        //add end      
	}
	...
	@Override
    public int rotationForOrientationLw(int orientation, int lastRotation) {
    		...
    		default:
                // For USER, UNSPECIFIED, NOSENSOR, SENSOR and FULL_SENSOR,
                // just return the preferred orientation we already calculated.
                if (preferredRotation >= 0) {
                    return preferredRotation;
                }
              	//  return Surface.ROTATION_0;
                return mDefaultOrientation;// modify
            }
        }
    }

8.0部分方向旋转的逻辑转移到DisplayContent.java中

• frameworks/base/services/core/java/com/android/server/wm/DisplayContent.java

DisplayContent(Display display, WindowManagerService service,
            WindowLayersController layersController, WallpaperController wallpaperController) {
        if (service.mRoot.getDisplayContent(display.getDisplayId()) != null) {
            throw new IllegalArgumentException("Display with ID=" + display.getDisplayId()
                    + " already exists=" + service.mRoot.getDisplayContent(display.getDisplayId())
                    + " new=" + display);
        }
        ...
        //add start
        String defaultOrientation = SystemProperties.get("persist.panel.orientation", "0");
        if("0".equals(defaultOrientation)) {
            mRotation = Surface.ROTATION_0;
        } else if("90".equals(defaultOrientation)) {
            mRotation = Surface.ROTATION_90;
        } else if("180".equals(defaultOrientation)) {
            mRotation = Surface.ROTATION_180;
        } else if("270".equals(defaultOrientation)) {
            mRotation = Surface.ROTATION_270;
        } else {
            mRotation = Surface.ROTATION_0;
        }
        //add end
    }

5.应用横屏显示

• frameworks/base/services/core/java/com/android/server/wm/DisplayContent.java

/**
     * Update rotation of the display.
     *
     * Returns true if the rotation has been changed.  In this case YOU MUST CALL
     * {@link WindowManagerService#sendNewConfiguration(int)} TO UNFREEZE THE SCREEN.
     */
    boolean updateRotationUnchecked(boolean inTransaction) {
    	//add start
       String defaultOrientation = SystemProperties.get("persist.panel.orientation", "0");
       if ("90".equals(defaultOrientation) || "270".equals(defaultOrientation)){
            return true;
       }
       // add end