g_senser frameworks 层转屏数据流程

一、调用流程： 1、\frameworks\base\core\java\android\view\WindowOrientationListener.java onSensorChanged -- > calculateNewRotation calculateNewRotation -- > onOrientationChanged 2、\frameworks\base\policy\src\com\android\internal\policy\impl\PhoneWindowManager.java onOrientationChanged --> setRotation 3、\frameworks\base\services\java\com\android\server\WindowManagerService.java 中 setRotation --> setRotationUncheckedLocked public boolean setRotationUncheckedLocked(int rotation, int animFlags) // 函数用来最终设置屏方向。二、 calculateNewRotation（）函数 private void calculateNewRotation(float orientation, float tiltAngle) {
if (localLOGV) Log.i(TAG, orientation + ", " + tiltAngle + ", " + mRotation);

//final boolean allow180Rotation = mAllow180Rotation;
final boolean allow180Rotation = true;
int thresholdRanges[][] = allow180Rotation ? THRESHOLDS_WITH_180[mRotation] : THRESHOLDS[mRotation]; //判断支持哪种旋转模式 THRESHOLDS_WITH_180 或THRESHOLDS
int row = -1;
for (int i = 0; i < thresholdRanges.length; i++) {
if (orientation >= thresholdRanges[i][0] && orientation < thresholdRanges[i][1]) { //判断旋转地范围
row = i;
break;
}
}
if (row == -1) return; // no matching transition int rotation = allow180Rotation ? ROTATE_TO_WITH_180[mRotation][row] : ROTATE_TO[mRotation][row]; //根据mRotation、row判断旋转方向，也就是要转向的那个方向 //此时mRotation对应你当前屏幕方向， rotation 是你马上要转向的那个方向
if (tiltAngle > MAX_TRANSITION_TILT[rotation]) {
// tilted too far flat to go to this rotation
return;
}
if (localLOGV) Log.i(TAG, "orientation " + orientation + " gives new rotation = " + rotation);
mRotation = rotation; //此时 mRotation 对应你要转向的方向了
mOrientationListener.onOrientationChanged(INTERNAL_TO_SURFACE_ROTATION[mRotation]); // 将mRotation传递到WindowManagerService.java中做屏幕的旋转
} 三、 修改备忘 路径：frameworks\base\core\java\android\view\WindowOrientationListener.java /*default
private static final int[][] ROTATE_TO_WITH_180 = new int[][] {
{ROTATION_90, ROTATION_180, ROTATION_270},
{ROTATION_0, ROTATION_180, ROTATION_90, ROTATION_0},
{ROTATION_0, ROTATION_270, ROTATION_180, ROTATION_0},
{ROTATION_0, ROTATION_90, ROTATION_270, ROTATION_0},
};
*/ private static final int[][] ROTATE_TO_WITH_180 = new int[][] {
{ROTATION_90, ROTATION_180, ROTATION_270},
{ROTATION_0, ROTATION_180, ROTATION_270, ROTATION_0},
{ROTATION_0, ROTATION_90, ROTATION_180, ROTATION_0},
{ROTATION_0, ROTATION_90, ROTATION_270, ROTATION_0},
};

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