android传感器获取运动方向,Android 重力感应获取手机运动方向和角度
时间: 2023-11-15 22:13:52 浏览: 51
Android提供了一些传感器API来获取手机的运动方向和角度。其中,最常用的是重力感应器和磁场感应器。
重力感应器可以用来检测手机的倾斜和旋转,可以通过以下代码获取到手机的加速度和重力加速度:
```
SensorManager sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
Sensor accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
Sensor gravitySensor = sensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
sensorManager.registerListener(new SensorEventListener() {
float[] gravity = new float[3];
float[] linear_acceleration = new float[3];
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_GRAVITY)
gravity = event.values.clone();
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
final float alpha = 0.8f;
gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];
linear_acceleration[0] = event.values[0] - gravity[0];
linear_acceleration[1] = event.values[1] - gravity[1];
linear_acceleration[2] = event.values[2] - gravity[2];
// 计算手机的倾斜角度
float xAngle = (float) Math.atan2(linear_acceleration[1], linear_acceleration[2]) * 180 / (float) Math.PI;
float yAngle = (float) Math.atan2(linear_acceleration[0], linear_acceleration[2]) * 180 / (float) Math.PI;
float zAngle = (float) Math.atan2(linear_acceleration[0], linear_acceleration[1]) * 180 / (float) Math.PI;
}
}
}, accelerometer, gravitySensor, SensorManager.SENSOR_DELAY_GAME);
```
磁场感应器可以用来检测手机的方向,可以通过以下代码获取到手机的方向角度:
```
SensorManager sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
Sensor magneticSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
Sensor accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sensorManager.registerListener(new SensorEventListener() {
float[] accelerometerValues = new float[3];
float[] magneticValues = new float[3];
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
accelerometerValues = event.values.clone();
} else if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
magneticValues = event.values.clone();
}
float[] R = new float[9];
float[] values = new float[3];
SensorManager.getRotationMatrix(R, null, accelerometerValues, magneticValues);
SensorManager.getOrientation(R, values);
float azimuth = (float) Math.toDegrees(values[0]);
float pitch = (float) Math.toDegrees(values[1]);
float roll = (float) Math.toDegrees(values[2]);
}
}, magneticSensor, accelerometer, SensorManager.SENSOR_DELAY_GAME);
```
通过以上代码,你可以获取到手机的倾斜角度、方向角度等信息,从而获得手机的运动方向和角度。
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