Android 如何获取传感器的数据方法详解

　　public class MainActivity extends AppCompatActivity {

　　private final String TAG = "sensor-sample";

　　private TextView mAccelerometerSensorTextView;

　　private TextView mMagneticSensorTextView;

　　private TextView mGyroscopeSensorTextView;

　　private TextView mOrientationSensorTextView;

　　private SensorManager mSensorManager;

　　private MySensorEventListener mMySensorEventListener;

　　private float[] mAccelerometerReading = new float[3];

　　private float[] mMagneticFieldReading = new float[3];

　　@Override

　　protected void onCreate(Bundle savedInstanceState) {

　　super.onCreate(savedInstanceState);

　　setContentView(R.layout.activity_main);

　　mAccelerometerSensorTextView = findViewById(R.id.accelerometer_sensor);

　　mMagneticSensorTextView = findViewById(R.id.magnetic_sensor);

　　mGyroscopeSensorTextView = findViewById(R.id.gyroscope_sensor);

　　mOrientationSensorTextView = findViewById(R.id.orientation_sensor);

　　this.mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

　　this.mMySensorEventListener = new MySensorEventListener();

　　}

　　@Override

　　protected void onResume() {

　　super.onResume();

　　if (mSensorManager == null) {

　　return;

　　}

　　Sensor accelerometerSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

　　if (accelerometerSensor != null) {

　　//register accelerometer sensor listener

　　mSensorManager.registerListener(mMySensorEventListener, accelerometerSensor, SensorManager.SENSOR_DELAY_UI);

　　} else {

　　Log.d(TAG, "Accelerometer sensors are not supported on current devices.");

　　}

　　Sensor magneticSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

　　if (magneticSensor != null) {

　　//register magnetic sensor listener

　　mSensorManager.registerListener(mMySensorEventListener, magneticSensor, SensorManager.SENSOR_DELAY_UI);

　　} else {

　　Log.d(TAG, "Magnetic sensors are not supported on current devices.");

　　}

　　Sensor gyroscopeSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);

　　if (gyroscopeSensor != null) {

　　//register gyroscope sensor listener

　　mSensorManager.registerListener(mMySensorEventListener, gyroscopeSensor, SensorManager.SENSOR_DELAY_UI);

　　} else {

　　Log.d(TAG, "Gyroscope sensors are not supported on current devices.");

　　}

　　}

　　@Override

　　protected void onPause() {

　　super.onPause();

　　if (mSensorManager == null) {

　　return;

　　}

　　//unregister all listener

　　mSensorManager.unregisterListener(mMySensorEventListener);

　　}

　　/*

　　This orientation sensor was deprecated in Android 2.2 (API level 8), and this sensor type was deprecated in Android 4.4W (API level 20).

　　The sensor framework provides alternate methods for acquiring device orientation.

　　*/

　　private void calculateOrientation() {

　　final float[] rotationMatrix = new float[9];

　　SensorManager.getRotationMatrix(rotationMatrix, null, mAccelerometerReading, mMagneticFieldReading);

　　final float[] orientationAngles = new float[3];

　　SensorManager.getOrientation(rotationMatrix, orientationAngles);

　　Log.d(TAG, "orientation data[x:" + orientationAngles[0] + ", y:" + orientationAngles[1] + ", z:" + orientationAngles[2] + "]");

　　mOrientationSensorTextView.setText("[x:" + orientationAngles[0] + ", y:" + orientationAngles[1] + ", z:" + orientationAngles[2] + "]");

　　}

　　private class MySensorEventListener implements SensorEventListener {

　　@Override

　　public void onSensorChanged(SensorEvent event) {

　　if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

　　mAccelerometerReading = event.values;

　　Log.d(TAG, "accelerometer data[x:" + event.values[0] + ", y:" + event.values[1] + ", z:" + event.values[2] + "]");

　　mAccelerometerSensorTextView.setText("[x:" + event.values[0] + ", y:" + event.values[1] + ", z:" + event.values[2] + "]");

　　} else if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {

　　mMagneticFieldReading = event.values;

　　Log.d(TAG, "magnetic data[x:" + event.values[0] + ", y:" + event.values[1] + ", z:" + event.values[2] + "]");

　　mMagneticSensorTextView.setText("[x:" + event.values[0] + ", y:" + event.values[1] + ", z:" + event.values[2] + "]");

　　} else if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE) {

　　Log.d(TAG, "gyroscope data[x:" + event.values[0] + ", y:" + event.values[1] + ", z:" + event.values[2] + "]");

　　mGyroscopeSensorTextView.setText("[x:" + event.values[0] + ", y:" + event.values[1] + ", z:" + event.values[2] + "]");

　　}

　　calculateOrientation();

　　}

　　@Override

　　public void onAccuracyChanged(Sensor sensor, int accuracy) {

　　Log.d(TAG, "onAccuracyChanged:" + sensor.getType() + "->" + accuracy);

　　}

　　}

　　}