要获取一致的倾斜角度,需要使用SensorEventListener接口并实现其onSensorChanged()方法。其中,使用TYPE_ACCELEROMETER和TYPE_MAGNETIC_FIELD两个传感器测量设备在三维空间中的方向。然后,使用SensorManager.getRotationMatrix()方法将这两个传感器的值转换为包含设备方向的旋转矩阵,之后使用SensorManager.getOrientation()方法将该旋转矩阵转换为浮点类型的方向角度。
下面是具体的代码示例:
public class MainActivity extends AppCompatActivity implements SensorEventListener {
private SensorManager sensorManager;
private Sensor accelerometer;
private Sensor magnetometer;
float[] mGravity;
float[] mGeomagnetic;
float inclinationAngle; // 倾斜角度
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 获取传感器管理器
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
// 获取加速计
accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
// 获取磁力计
magnetometer = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
mGravity = event.values;
if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
mGeomagnetic = event.values;
if (mGravity != null && mGeomagnetic != null) {
float[] R = new float[9];
float[] I = new float[9];
if (SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic)) {
float[] orientation = new float[3];
SensorManager.getOrientation(R, orientation);
inclinationAngle = (float) Math.toDegrees(orientation[1]);
// 返回倾斜角度
}
}
}
@Override
protected void onResume() {
super.onResume();
sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
sensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
super.onPause();
sensorManager.unregisterListener(this);
}
// ... 其他代码
}
上述代码中,若要获取一致的倾斜角度,可直接调