手机屏幕旋转180度

客户需求：手机可以旋转到180度

代码路径： frameworks/base/policy/src/com/android/interal/policy/impl/PhoneWindowManager.java

 public int rotationForOrientationLw(int orientation, int lastRotation) {if (false) {Slog.v(TAG, "rotationForOrientationLw(orient="+ orientation + ", last=" + lastRotation+ "); user=" + mUserRotation + " "+ ((mUserRotationMode == WindowManagerPolicy.USER_ROTATION_LOCKED)? "USER_ROTATION_LOCKED" : ""));}        if (mForceDefaultOrientation) {return Surface.ROTATION_0;}synchronized (mLock) {int sensorRotation = mOrientationListener.getProposedRotation(); // may be -1if (sensorRotation < 0) {sensorRotation = lastRotation;}final int preferredRotation;if (mLidState == LID_OPEN && mLidOpenRotation >= 0) {// Ignore sensor when lid switch is open and rotation is forced.preferredRotation = mLidOpenRotation;} else if (mDockMode == Intent.EXTRA_DOCK_STATE_CAR&& (mCarDockEnablesAccelerometer || mCarDockRotation >= 0)) {// Ignore sensor when in car dock unless explicitly enabled.// This case can override the behavior of NOSENSOR, and can also// enable 180 degree rotation while docked.preferredRotation = mCarDockEnablesAccelerometer? sensorRotation : mCarDockRotation;} else if ((mDockMode == Intent.EXTRA_DOCK_STATE_DESK|| mDockMode == Intent.EXTRA_DOCK_STATE_LE_DESK|| mDockMode == Intent.EXTRA_DOCK_STATE_HE_DESK)&& (mDeskDockEnablesAccelerometer || mDeskDockRotation >= 0)) {// Ignore sensor when in desk dock unless explicitly enabled.// This case can override the behavior of NOSENSOR, and can also// enable 180 degree rotation while docked.preferredRotation = mDeskDockEnablesAccelerometer? sensorRotation : mDeskDockRotation;} else if (mHdmiPlugged && mDemoHdmiRotationLock) {// Ignore sensor when plugged into HDMI when demo HDMI rotation lock enabled.// Note that the dock orientation overrides the HDMI orientation.preferredRotation = mDemoHdmiRotation;} else if (mHdmiPlugged && mDockMode == Intent.EXTRA_DOCK_STATE_UNDOCKED&& mUndockedHdmiRotation >= 0) {// Ignore sensor when plugged into HDMI and an undocked orientation has// been specified in the configuration (only for legacy devices without// full multi-display support).// Note that the dock orientation overrides the HDMI orientation.preferredRotation = mUndockedHdmiRotation;} else if (orientation == ActivityInfo.SCREEN_ORIENTATION_LOCKED) {// Application just wants to remain locked in the last rotation.preferredRotation = lastRotation;} else if ((mUserRotationMode == WindowManagerPolicy.USER_ROTATION_FREE&& (orientation == ActivityInfo.SCREEN_ORIENTATION_USER|| orientation == ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED|| orientation == ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE|| orientation == ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT|| orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_USER))|| orientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR|| orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR|| orientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE|| orientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT) {// Otherwise, use sensor only if requested by the application or enabled// by default for USER or UNSPECIFIED modes.  Does not apply to NOSENSOR.if (mAllowAllRotations < 0) {// Can't read this during init() because the context doesn't// have display metrics at that time so we cannot determine// tablet vs. phone then.mAllowAllRotations = mContext.getResources().getBoolean(com.android.internal.R.bool.config_allowAllRotations) ? 1 : 0;
//可以修改 config_allowAllRotations ，core/res/res/values/config.xml:    <bool name="config_allowAllRotations">false</bool>设置成ture,即 mAllowAllRotations == 1；}
//这里是判断旋转是否是180度，如果是，执行else内容preferredRotation = sensorRotation;
//                if (sensorRotation != Surface.ROTATION_180
//                        || mAllowAllRotations == 1
//                        || orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR
//                        || orientation == ActivityInfo.SCREEN_ORIENTATION_FULL_USER) {
//                    preferredRotation = sensorRotation;
//                } else {
//                    preferredRotation = lastRotation;
//                }} else if (mUserRotationMode == WindowManagerPolicy.USER_ROTATION_LOCKED&& orientation != ActivityInfo.SCREEN_ORIENTATION_NOSENSOR) {// Apply rotation lock.  Does not apply to NOSENSOR.// The idea is that the user rotation expresses a weak preference for the direction// of gravity and as NOSENSOR is never affected by gravity, then neither should// NOSENSOR be affected by rotation lock (although it will be affected by docks).preferredRotation = mUserRotation;} else {// No overriding preference.// We will do exactly what the application asked us to do.preferredRotation = -1;}switch (orientation) {case ActivityInfo.SCREEN_ORIENTATION_PORTRAIT:// Return portrait unless overridden.if (isAnyPortrait(preferredRotation)) {return preferredRotation;}return mPortraitRotation;case ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE:// Return landscape unless overridden.if (isLandscapeOrSeascape(preferredRotation)) {return preferredRotation;}return mLandscapeRotation;case ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT:// Return reverse portrait unless overridden.if (isAnyPortrait(preferredRotation)) {return preferredRotation;}return mUpsideDownRotation;case ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE:// Return seascape unless overridden.if (isLandscapeOrSeascape(preferredRotation)) {return preferredRotation;}return mSeascapeRotation;case ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE:case ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE:// Return either landscape rotation.if (isLandscapeOrSeascape(preferredRotation)) {return preferredRotation;}if (isLandscapeOrSeascape(lastRotation)) {return lastRotation;}return mLandscapeRotation;case ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT:case ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT:// Return either portrait rotation.if (isAnyPortrait(preferredRotation)) {return preferredRotation;}if (isAnyPortrait(lastRotation)) {return lastRotation;}return mPortraitRotation;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;}}}

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