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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="30dp"
        android:text="Simple Pedometer"
        android:textSize="25sp" />

    <TextView
        android:id="@+id/tv_step"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="5dp"
        android:text="0"
        android:textColor="#DE5347"
        android:textSize="100sp"
        android:textStyle="bold" />

    <Button
        android:id="@+id/btn_start"
        android:layout_width="match_parent"
        android:layout_height="64dp"
        android:text="Start"
        android:textSize="25sp" />

</LinearLayout>

public class MainActivity extends AppCompatActivity implements View.OnClickListener, SensorEventListener {

    private SensorManager sManager;
    private Sensor mSensorAccelerometer;
    private TextView tv_step;
    private Button btn_start;
    private int step = 0;   //Step count
    private double oriValue = 0;  //Original value
    private double lstValue = 0;  //Previous value
    private double curValue = 0;  //Current value
    private boolean motiveState = true;   //Whether in motion state
    private boolean processState = false;   //Flag to mark whether it is currently counting steps


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mSensorAccelerometer = sManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sManager.registerListener(this, mSensorAccelerometer, SensorManager.SENSOR_DELAY_UI);
        bindViews();
    }

    private void bindViews() {

        tv_step = (TextView) findViewById(R.id.tv_step);
        btn_start = (Button) findViewById(R.id.btn_start);
        btn_start.setOnClickListener(this);
    }


    @Override
    public void onSensorChanged(SensorEvent event) {
        double range = 1;   //Set an accuracy range
        float[] value = event.values;
        curValue = magnitude(value[0], value[1], value[2]);   //Calculate the current magnitude
        //Accelerating upward state
        if (motiveState == true) {
            if (curValue >= lstValue) lstValue = curValue;
            else {

His three values are the angular velocities of rotation along the X-axis, Y-axis, and Z-axis, respectively. When the phone rotates counterclockwise, the angular velocity is positive; when it rotates clockwise, it is negative!
This is often used to calculate the angle the phone has rotated! This is a piece of code from the internet~