Android實現計步器功能

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >
 
 <TextView
  android:id="@+id/tv_step"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:padding="5dp"
  android:text="設備檢測到您當前走瞭0步，總計數為0步"
  android:textColor="@color/black"
  android:textSize="17sp" />
</LinearLayout>

public class MainActivity extends BaseActivity
  implements SensorEventListener {
 
 private TextView tv_step;
 private SensorManager mSensorMgr;// 聲明一個傳感管理器對象
 private int mStep;
 private int mStepCount;
 
 @Override
 protected MvcBaseModel getModelImp() {
  return null;
 }
 
 @Override
 protected int getContentLayoutId() {
  return R.layout.activity_main;
 }
 
 @Override
 protected void initWidget() {
  tv_step = findViewById(R.id.tv_step);
  // 從系統服務中獲取傳感管理器對象
  mSensorMgr = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
 }
 
 @Override
 protected void onPause() {
  super.onPause();
  // 註銷當前活動的傳感監聽器
  mSensorMgr.unregisterListener(this);
 }
 
 @Override
 protected void onResume() {
  super.onResume();
  //註冊步行檢測
  mSensorMgr.registerListener(this,
    mSensorMgr.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR),
    SensorManager.SENSOR_DELAY_NORMAL);
  //註冊步行計數
  mSensorMgr.registerListener(this,
    mSensorMgr.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR),
    SensorManager.SENSOR_DELAY_NORMAL);
 }
 
 @Override
 public void onSensorChanged(SensorEvent event) {
  if (event.sensor.getType() == Sensor.TYPE_STEP_DETECTOR){//步行檢測事件
   if (event.values[0] == 1.0f){
    mStep++;
   }
  }else if (event.sensor.getType() == Sensor.TYPE_STEP_COUNTER){//計步器事件
   mStepCount = (int) event.values[0];
  }
  String desc = String.format("設備檢測到您當前走瞭%d步，總計數為%d步",mStep,mStepCount);
  tv_step.setText(desc);
 }
 
 //當傳感器精度改變時回調該方法，一般無需處理
 public void onAccuracyChanged(Sensor sensor, int accuracy) {}
}