參考文章:http://www.lxweimin.com/p/5d57f7fd84fa
本文對原文計步項目進(jìn)行了精簡,移除了進(jìn)程服務(wù)和計時、守護(hù)進(jìn)程、數(shù)據(jù)庫保存等等,方便擴(kuò)展功能。
本文源碼:https://github.com/lioilwin/StepOrient
Android4.4以上版本,有些手機有計步傳感器可以直接使用,
而有些手機沒有,但有加速度傳感器,也可以實現(xiàn)計步功能(需要計算加速度波峰波谷來判斷人走一步)!
image
一.調(diào)用
public class MainActivity extends AppCompatActivity implements StepSensorBase.StepCallBack{
.........
@Override
public void Step(int stepNum) {
// 計步回調(diào)
stepText.setText("步數(shù):" + stepNum);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
stepText = (TextView) findViewById(R.id.step_text);
// 開啟計步監(jiān)聽, 分為加速度傳感器、或計步傳感器
stepSensor = new StepSensorPedometer(this, this);
if (!stepSensor.registerStep()) {
Toast.makeText(this, "計步傳傳感器不可用!", Toast.LENGTH_SHORT).show();
stepSensor = new StepSensorAcceleration(this, this);
if (!stepSensor.registerStep()) {
Toast.makeText(this, "加速度傳感器不可用!", Toast.LENGTH_SHORT).show();
}
}
}
.......
}
/**
* 計步傳感器抽象類,子類分為加速度傳感器、或計步傳感器
*/
public abstract class StepSensorBase implements SensorEventListener {
private Context context;
protected StepCallBack stepCallBack;
protected SensorManager sensorManager;
protected static int CURRENT_SETP = 0;
protected boolean isAvailable = false;
public StepSensorBase(Context context, StepCallBack stepCallBack) {
this.context = context;
this.stepCallBack = stepCallBack;
}
public interface StepCallBack {
/**
* 計步回調(diào)
*/
void Step(int stepNum);
}
/**
* 開啟計步
*/
public boolean registerStep() {
if (sensorManager != null) {
sensorManager.unregisterListener(this);
sensorManager = null;
}
sensorManager = SensorUtil.getInstance().getSensorManager(context);
registerStepListener();
return isAvailable;
}
/**
* 注冊計步監(jiān)聽器
*/
protected abstract void registerStepListener();
/**
* 注銷計步監(jiān)聽器
*/
public abstract void unregisterStep();
}
二.直接使用計步傳感器實現(xiàn)計步
/**
* 計步傳感器
*/
public class StepSensorPedometer extends StepSensorBase {
private final String TAG = "StepSensorPedometer";
private int lastStep = -1;
private int liveStep = 0;
private int increment = 0;
private int sensorMode = 0; // 計步傳感器類型
public StepSensorPedometer(Context context, StepCallBack stepCallBack) {
super(context, stepCallBack);
}
@Override
protected void registerStepListener() {
Sensor detectorSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);
Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
if (sensorManager.registerListener(this, detectorSensor, SensorManager.SENSOR_DELAY_GAME)) {
isAvailable = true;
sensorMode = 0;
Log.i(TAG, "計步傳感器Detector可用!");
} else if (sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_GAME)) {
isAvailable = true;
sensorMode = 1;
Log.i(TAG, "計步傳感器Counter可用!");
} else {
isAvailable = false;
Log.i(TAG, "計步傳感器不可用!");
}
}
@Override
public void unregisterStep() {
sensorManager.unregisterListener(this);
}
@Override
public void onSensorChanged(SensorEvent event) {
liveStep = (int) event.values[0];
if (sensorMode == 0) {
Log.i(TAG, "Detector步數(shù):"+liveStep);
StepSensorBase.CURRENT_SETP += liveStep;
} else if (sensorMode == 1) {
Log.i(TAG, "Counter步數(shù):"+liveStep);
StepSensorBase.CURRENT_SETP = liveStep;
}
stepCallBack.Step(StepSensorBase.CURRENT_SETP);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
三.使用加速度傳感器實現(xiàn)計步
/**
* 加速度傳感器
*/
public class StepSensorAcceleration extends StepSensorBase {
private final String TAG = "StepSensorAcceleration";
//存放三軸數(shù)據(jù)
final int valueNum = 5;
//用于存放計算閾值的波峰波谷差值
float[] tempValue = new float[valueNum];
int tempCount = 0;
//是否上升的標(biāo)志位
boolean isDirectionUp = false;
//持續(xù)上升次數(shù)
int continueUpCount = 0;
//上一點的持續(xù)上升的次數(shù),為了記錄波峰的上升次數(shù)
int continueUpFormerCount = 0;
//上一點的狀態(tài),上升還是下降
boolean lastStatus = false;
//波峰值
float peakOfWave = 0;
//波谷值
float valleyOfWave = 0;
//此次波峰的時間
long timeOfThisPeak = 0;
//上次波峰的時間
long timeOfLastPeak = 0;
//當(dāng)前的時間
long timeOfNow = 0;
//當(dāng)前傳感器的值
float gravityNew = 0;
//上次傳感器的值
float gravityOld = 0;
//動態(tài)閾值需要動態(tài)的數(shù)據(jù),這個值用于這些動態(tài)數(shù)據(jù)的閾值
final float initialValue = (float) 1.7;
//初始閾值
float ThreadValue = (float) 2.0;
//初始范圍
float minValue = 11f;
float maxValue = 19.6f;
/**
* 0-準(zhǔn)備計時 1-計時中 2-正常計步中
*/
private int CountTimeState = 0;
public static int TEMP_STEP = 0;
private int lastStep = -1;
//用x、y、z軸三個維度算出的平均值
public static float average = 0;
private Timer timer;
// 倒計時3.5秒,3.5秒內(nèi)不會顯示計步,用于屏蔽細(xì)微波動
private long duration = 3500;
private TimeCount time;
public StepSensorAcceleration(Context context, StepCallBack stepCallBack) {
super(context, stepCallBack);
}
@Override
protected void registerStepListener() {
// 注冊加速度傳感器
isAvailable = sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_GAME);
if (isAvailable) {
Log.i(TAG, "加速度傳感器可用!");
} else {
Log.i(TAG, "加速度傳感器不可用!");
}
}
@Override
public void unregisterStep() {
sensorManager.unregisterListener(this);
}
public void onAccuracyChanged(Sensor arg0, int arg1) {
}
public void onSensorChanged(SensorEvent event) {
Sensor sensor = event.sensor;
synchronized (this) {
if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
calc_step(event);
}
}
}
synchronized private void calc_step(SensorEvent event) {
average = (float) Math.sqrt(Math.pow(event.values[0], 2)
+ Math.pow(event.values[1], 2) + Math.pow(event.values[2], 2));
detectorNewStep(average);
}
/*
* 檢測步子,并開始計步
* 1.傳入sersor中的數(shù)據(jù)
* 2.如果檢測到了波峰,并且符合時間差以及閾值的條件,則判定為1步
* 3.符合時間差條件,波峰波谷差值大于initialValue,則將該差值納入閾值的計算中
* */
public void detectorNewStep(float values) {
if (gravityOld == 0) {
gravityOld = values;
} else {
if (DetectorPeak(values, gravityOld)) {
timeOfLastPeak = timeOfThisPeak;
timeOfNow = System.currentTimeMillis();
if (timeOfNow - timeOfLastPeak >= 200
&& (peakOfWave - valleyOfWave >= ThreadValue) && (timeOfNow - timeOfLastPeak) <= 2000) {
timeOfThisPeak = timeOfNow;
//更新界面的處理,不涉及到算法
preStep();
}
if (timeOfNow - timeOfLastPeak >= 200
&& (peakOfWave - valleyOfWave >= initialValue)) {
timeOfThisPeak = timeOfNow;
ThreadValue = Peak_Valley_Thread(peakOfWave - valleyOfWave);
}
}
}
gravityOld = values;
}
private void preStep() {
// if (CountTimeState == 0) {
// // 開啟計時器
// time = new TimeCount(duration, 700);
// time.start();
// CountTimeState = 1;
// Log.v(TAG, "開啟計時器");
// } else if (CountTimeState == 1) {
// TEMP_STEP++;
// Log.v(TAG, "計步中 TEMP_STEP:" + TEMP_STEP);
// } else if (CountTimeState == 2) {
StepSensorBase.CURRENT_SETP++;
// if (stepCallBack != null) {
stepCallBack.Step(StepSensorBase.CURRENT_SETP);
// }
// }
}
/*
* 檢測波峰
* 以下四個條件判斷為波峰:
* 1.目前點為下降的趨勢:isDirectionUp為false
* 2.之前的點為上升的趨勢:lastStatus為true
* 3.到波峰為止,持續(xù)上升大于等于2次
* 4.波峰值大于1.2g,小于2g
* 記錄波谷值
* 1.觀察波形圖,可以發(fā)現(xiàn)在出現(xiàn)步子的地方,波谷的下一個就是波峰,有比較明顯的特征以及差值
* 2.所以要記錄每次的波谷值,為了和下次的波峰做對比
* */
public boolean DetectorPeak(float newValue, float oldValue) {
lastStatus = isDirectionUp;
if (newValue >= oldValue) {
isDirectionUp = true;
continueUpCount++;
} else {
continueUpFormerCount = continueUpCount;
continueUpCount = 0;
isDirectionUp = false;
}
// Log.v(TAG, "oldValue:" + oldValue);
if (!isDirectionUp && lastStatus
&& (continueUpFormerCount >= 2 && (oldValue >= minValue && oldValue < maxValue))) {
peakOfWave = oldValue;
return true;
} else if (!lastStatus && isDirectionUp) {
valleyOfWave = oldValue;
return false;
} else {
return false;
}
}
/*
* 閾值的計算
* 1.通過波峰波谷的差值計算閾值
* 2.記錄4個值,存入tempValue[]數(shù)組中
* 3.在將數(shù)組傳入函數(shù)averageValue中計算閾值
* */
public float Peak_Valley_Thread(float value) {
float tempThread = ThreadValue;
if (tempCount < valueNum) {
tempValue[tempCount] = value;
tempCount++;
} else {
tempThread = averageValue(tempValue, valueNum);
for (int i = 1; i < valueNum; i++) {
tempValue[i - 1] = tempValue[i];
}
tempValue[valueNum - 1] = value;
}
return tempThread;
}
/*
* 梯度化閾值
* 1.計算數(shù)組的均值
* 2.通過均值將閾值梯度化在一個范圍里
* */
public float averageValue(float value[], int n) {
float ave = 0;
for (int i = 0; i < n; i++) {
ave += value[i];
}
ave = ave / valueNum;
if (ave >= 8) {
// Log.v(TAG, "超過8");
ave = (float) 4.3;
} else if (ave >= 7 && ave < 8) {
// Log.v(TAG, "7-8");
ave = (float) 3.3;
} else if (ave >= 4 && ave < 7) {
// Log.v(TAG, "4-7");
ave = (float) 2.3;
} else if (ave >= 3 && ave < 4) {
// Log.v(TAG, "3-4");
ave = (float) 2.0;
} else {
// Log.v(TAG, "else");
ave = (float) 1.7;
}
return ave;
}
class TimeCount extends CountDownTimer {
public TimeCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
@Override
public void onFinish() {
// 如果計時器正常結(jié)束,則開始計步
time.cancel();
StepSensorBase.CURRENT_SETP += TEMP_STEP;
lastStep = -1;
Log.v(TAG, "計時正常結(jié)束");
timer = new Timer(true);
TimerTask task = new TimerTask() {
public void run() {
if (lastStep == StepSensorBase.CURRENT_SETP) {
timer.cancel();
CountTimeState = 0;
lastStep = -1;
TEMP_STEP = 0;
Log.v(TAG, "停止計步:" + StepSensorBase.CURRENT_SETP);
} else {
lastStep = StepSensorBase.CURRENT_SETP;
}
}
};
timer.schedule(task, 0, 2000);
CountTimeState = 2;
}
@Override
public void onTick(long millisUntilFinished) {
if (lastStep == TEMP_STEP) {
Log.v(TAG, "onTick 計時停止:" + TEMP_STEP);
time.cancel();
CountTimeState = 0;
lastStep = -1;
TEMP_STEP = 0;
} else {
lastStep = TEMP_STEP;
}
}
}
}
簡書: http://www.lxweimin.com/p/6b05b1b8603e
CSDN博客: http://blog.csdn.net/qq_32115439/article/details/61619644
GitHub博客:http://lioil.win/2017/03/12/Android-Step.html
Coding博客:http://c.lioil.win/2017/03/12/Android-Step.html