我如何得到正确的方位(磁方位),无论屏幕方向? [英] How do I get the correct bearing (magnetic orientation) regardless of screen orientation?
问题描述
我想获得当前磁性取向无论当前屏幕方向(横向或纵向)。
I want to get the current magnetic orientation regardless of the current screen orientation (landscape or portrait).
我发现这个的例子,但它不是方向独立,对吧?和这没有帮助我满意。我也看过的http://android-developers.blogspot.de/2010/09/one-screen-turn-deserves-another.html.
I found this example, but it's not orientation independant, right? And this didn't help me either. I did also read http://android-developers.blogspot.de/2010/09/one-screen-turn-deserves-another.html.
这是我目前的做法与德precated办法,我不想用(短):
This is my current approach with the deprecated way I don't want to use (short):
mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
private SensorEventListener sensorEventListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent event) {
/* Get measured value */
float current_measured_bearing = (float) event.values[0];
/* Compensate device orientation */
switch (((WindowManager) getSystemService(WINDOW_SERVICE))
.getDefaultDisplay().getRotation()) {
case Surface.ROTATION_90:
current_measured_bearing = current_measured_bearing + 90f;
break;
case Surface.ROTATION_180:
current_measured_bearing = current_measured_bearing - 180f;
break;
case Surface.ROTATION_270:
current_measured_bearing = current_measured_bearing - 90f;
break;
}
但最后一部分肯定是不对的!如何在这种情况下,正确地使用较新的方法 getRotationMatrix()
? (方向无关)或者,我只需要使用 event.values []
基于旋转矩阵阵列中的其他值?或将我需要重新映射坐标?那么,<一个href="http://stackoverflow.com/questions/11744201/android-sensor-type-orientation-works-perfect-and-i-cant-get-the-same-results-w">that实现这一目标的正确方法是什么?
But the last part is definitely wrong! How do I use the newer method getRotationMatrix()
correctly in this case? (Orientation independent) Or do I simply have to use other values of the event.values[]
array based on the Rotation Matrix? Or will I need to 'remap the coordinates'? So is that the correct way of achieving this?
我正在开发的360度屏幕旋转和API级别11 +设备。
I'm developing for devices with 360° screen rotation and on API Level 11+.
我知道,这些问题的提出往往但我根本就没有自己的答案传送给我的问题。
I know that those questions are asked very often but I could simply not transfer their answers to my question.
推荐答案
确定我终于设法得到code工作!
OK I finally managed to get the code working!
首先,我注册一个 Sensor.TYPE_MAGNETIC_FIELD
和 Sensor.TYPE_GRAVITY
:(!喜欢的还阮说)
First, I register a Sensor.TYPE_MAGNETIC_FIELD
and Sensor.TYPE_GRAVITY
: (like Hoan Nguyen said!)
/**
* Initialize the Sensors (Gravity and magnetic field, required as a compass
* sensor)
*/
private void initSensors() {
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
Sensor mSensorGravity = sensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
Sensor mSensorMagneticField = sensorManager
.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
/* Initialize the gravity sensor */
if (mSensorGravity != null) {
Log.i(TAG, "Gravity sensor available. (TYPE_GRAVITY)");
sensorManager.registerListener(mSensorEventListener,
mSensorGravity, SensorManager.SENSOR_DELAY_GAME);
} else {
Log.i(TAG, "Gravity sensor unavailable. (TYPE_GRAVITY)");
}
/* Initialize the magnetic field sensor */
if (mSensorMagneticField != null) {
Log.i(TAG, "Magnetic field sensor available. (TYPE_MAGNETIC_FIELD)");
sensorManager.registerListener(mSensorEventListener,
mSensorMagneticField, SensorManager.SENSOR_DELAY_GAME);
} else {
Log.i(TAG,
"Magnetic field sensor unavailable. (TYPE_MAGNETIC_FIELD)");
}
}
和我使用 SensorEventListner
的计算:
private SensorEventListener mSensorEventListener = new SensorEventListener() {
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_GRAVITY) {
mGravity = event.values.clone();
} else if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
mMagnetic = event.values.clone();
}
if (mGravity != null && mMagnetic != null) {
/* Create rotation Matrix */
float[] rotationMatrix = new float[9];
if (SensorManager.getRotationMatrix(rotationMatrix, null,
mGravity, mMagnetic)) {
/* Compensate device orientation */
// http://android-developers.blogspot.de/2010/09/one-screen-turn-deserves-another.html
float[] remappedRotationMatrix = new float[9];
switch (getWindowManager().getDefaultDisplay()
.getRotation()) {
case Surface.ROTATION_0:
SensorManager.remapCoordinateSystem(rotationMatrix,
SensorManager.AXIS_X, SensorManager.AXIS_Y,
remappedRotationMatrix);
break;
case Surface.ROTATION_90:
SensorManager.remapCoordinateSystem(rotationMatrix,
SensorManager.AXIS_Y,
SensorManager.AXIS_MINUS_X,
remappedRotationMatrix);
break;
case Surface.ROTATION_180:
SensorManager.remapCoordinateSystem(rotationMatrix,
SensorManager.AXIS_MINUS_X,
SensorManager.AXIS_MINUS_Y,
remappedRotationMatrix);
break;
case Surface.ROTATION_270:
SensorManager.remapCoordinateSystem(rotationMatrix,
SensorManager.AXIS_MINUS_Y,
SensorManager.AXIS_X, remappedRotationMatrix);
break;
}
/* Calculate Orientation */
float results[] = new float[3];
SensorManager.getOrientation(remappedRotationMatrix,
results);
/* Get measured value */
float current_measured_bearing = (float) (results[0] * 180 / Math.PI);
if (current_measured_bearing < 0) {
current_measured_bearing += 360;
}
/* Smooth values using a 'Low Pass Filter' */
current_measured_bearing = current_measured_bearing
+ SMOOTHING_FACTOR_COMPASS
* (current_measured_bearing - compass_last_measured_bearing);
/* Update normal output */
visual_compass_value.setText(String.valueOf(Math
.round(current_bearing))
+ getString(R.string.degrees));
/*
* Update variables for next use (Required for Low Pass
* Filter)
*/
compass_last_measured_bearing = current_measured_bearing;
}
}
}
};
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