利用GSensor让荧屏实现360度旋转

利用GSensor让屏幕实现360度旋转

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public void onSensorChanged(SensorEvent event) { float[] values = event.values; float X = values[_DATA_X]; float Y = values[_DATA_Y]; float Z = values[_DATA_Z]; float OneEightyOverPi = 57.29577957855f; float gravity = (float) Math.sqrt(X*X+Y*Y+Z*Z); float zyangle = (float)Math.asin(Z/gravity)*OneEightyOverPi; int rotation = -1; if ((zyangle <= PIVOT_UPPER) && (zyangle >= PIVOT_LOWER)) { // Check orientation only if the phone is flat enough // Don't trust the angle if the magnitude is small compared to the y value float angle = (float)Math.atan2(Y, -X) * OneEightyOverPi; int orientation = 90 - (int)Math.round(angle); // normalize to 0 - 359 range while (orientation >= 360) { orientation -= 360; } while (orientation < 0) { orientation += 360; } // Orientation values between LANDSCAPE_LOWER and PL_LOWER // are considered landscape. // Ignore orientation values between 0 and LANDSCAPE_LOWER // For orientation values between LP_UPPER and PL_LOWER, // the threshold gets set linearly around PIVOT. if ((orientation >= PL_LOWER) && (orientation <= LP_UPPER)) { float threshold; float delta = zyangle - PIVOT; if (mSensorRotation == Surface.ROTATION_90) { if (delta < 0) { // Delta is negative threshold = LP_LOWER - (LP_LF_LOWER * delta); } else { threshold = LP_LOWER + (LP_LF_UPPER * delta); } rotation = (orientation >= threshold) ? Surface.ROTATION_0 : Surface.ROTATION_90; } else { if (delta < 0) { // Delta is negative threshold = PL_UPPER+(PL_LF_LOWER * delta); } else { threshold = PL_UPPER-(PL_LF_UPPER * delta); } rotation = (orientation <= threshold) ? Surface.ROTATION_90: Surface.ROTATION_0; } } else if ((orientation >= LANDSCAPE_LOWER) && (orientation < LP_LOWER)) { rotation = Surface.ROTATION_90; } else if ((orientation >= PL_UPPER) || (orientation <= PORTRAIT_LOWER)) { rotation = Surface.ROTATION_0; } if ((rotation != -1) && (rotation != mSensorRotation)) { mSensorRotation = rotation; onOrientationChanged(mSensorRotation); } } }?

在Froyo中，对上述算法进行了修改，让其报出270度的旋转方向。

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修改下面函数 void android.view.WindowOrientationListener.SensorEventListenerImpl.onSensorChanged(android.hardware.SensorEvent event)

??????????? float[] values = event.values;
?????????????
??????????? float X = values[_DATA_X];
??????????? float Y = values[_DATA_Y];
??????????? float Z = values[_DATA_Z];
??????????? //For fixing the problem of Sensor change the window orientation error but the sensor game is no problem.
??????????? float OneEightyOverPi = 57.29577957855f;
??????????? float gravity = (float) Math.sqrt(X*X+Y*Y+Z*Z);
??????????? float zyangle = (float)Math.asin(Z/gravity)*OneEightyOverPi;
??????????? int rotation = -1;
??????????? if ((zyangle <= PIVOT_UPPER) && (zyangle >= PIVOT_LOWER)) {
??????????????? // Check orientation only if the phone is flat enough
??????????????? // Don't trust the angle if the magnitude is small compared to the y value
??????????????? float angle = (float)Math.atan2(Y, -X) * OneEightyOverPi;
??????????????? int orientation = 90 - (int)Math.round(angle);
??????????????? // normalize to 0 - 359 range
??????????????? while (orientation >= 360) {
??????????????????? orientation -= 360;
??????????????? }
??????????????? while (orientation < 0) {
??????????????????? orientation += 360;
??????????????? }
??????????????? Log.i("Tiger","orientation="+orientation);
???????????????? //确定由角度与屏幕方向的对应范围
??????????????? if(orientation > 325 || orientation <= 45){
??????????????? rotation = Surface.ROTATION_0;
??????????????? }else if(orientation > 45 && orientation <= 135){
??????????????? rotation = Surface.ROTATION_270;
??????????????? }else if(orientation > 135 && orientation < 225){
??????????????? rotation = Surface.ROTATION_180;
??????????????? }else {
??????????????? rotation = Surface.ROTATION_90;
??????????????? }
???????????????
??????????????? Log.i("Tiger","mSensorRotation="+mSensorRotation+"??? , rotation="+rotation);
??????????????? if ((rotation != -1) && (rotation != mSensorRotation)) {
??????????????????? mSensorRotation = rotation;
??????????????????? onOrientationChanged(mSensorRotation);
??????????????? }
??????????? }