18.03.01

附上Demo鏈接，歡迎探討撕咬～ Pedometer

18.02.23

最近接了個測試各大手機廠商計步芯片的活兒，所以簡單弄了個計步器的小Demo，搞搞測試。后續(xù)會把測試的結(jié)果一起發(fā)上來，造福鄉(xiāng)親們:我就是結(jié)果😊😊

基本功能

實時顯示從系統(tǒng)StepCounter芯片獲取的步數(shù)。

如果你要做個精準的計步器，只有基本步數(shù)的讀取與顯示是遠遠不夠的，還可能會涉及到：

進程保活

應用被系統(tǒng)意外殺死會導致數(shù)據(jù)丟失等情況，進程再次起來的時候需要有數(shù)據(jù)恢復等操作

ACC與StepCounter模式篩選

畢竟不是所有的手機都支持StepCounter芯片，在一些古老的手機上還是需要用ACC計算步數(shù)。對于兩者都支持設備，哪種方式更準確呢，這就需要有個篩選策略了

高頻數(shù)據(jù)讀寫

在統(tǒng)計數(shù)據(jù)中你會看到有的芯片會在1s內(nèi)回調(diào)60多次數(shù)據(jù)，這個時候就要考慮讀寫性能了，回調(diào)一次就寫一次sp顯然不是個好主意

工程源碼

MainActivity - UI 顯示

public class MainActivity extends AppCompatActivity {

private TextView tvStep;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

init();

}

private void init() {

tvStep = findViewById(R.id.tv_step);

register();

}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)

private void register() {

StepCounterManager.getInstance().addStepCounterObserver(new Observer() {

@Override

public void update(Observable o, Object arg) {

tvStep.setText("芯片實時獲取步數(shù): " + (float) arg );

}

});

StepCounterManager.getInstance().register();

}

@Override

protected void onDestroy() {

super.onDestroy();

StepCounterManager.getInstance().clearStepObserver();

StepCounterManager.getInstance().unRegister();

}

}

StepCounterManager - 核心StepCounter芯片注冊回調(diào)類

public class StepCounterManager implements SensorEventListener {

private static final int SENSER_TYPE_C = Sensor.TYPE_STEP_COUNTER;

private static StepCounterManager instance;

private final String TAG = "StepCounterManager";

private SensorManager mSensorManager;

private Sensor mStepCount;

private StepCounterObservable mStepCounterObservable;

private StepCounterManager() {

mSensorManager = (SensorManager) GlobalConfig.getAppContext().getSystemService(Context.SENSOR_SERVICE);

if (mSensorManager == null) {

Log.i(TAG, "StepCounterManager init error");

return;

}

mStepCount = mSensorManager.getDefaultSensor(SENSER_TYPE_C);

mStepCounterObservable = new StepCounterObservable();

}

static StepCounterManager getInstance() {

if (instance == null) {

synchronized (StepCounterManager.class) {

if (instance == null) {

instance = new StepCounterManager();

}

}

}

return instance;

}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)

void register() {

if (mStepCount == null) {

return;

}

String info = "name = "

+ mStepCount.getName() + ", version = " + mStepCount.getVersion() + ", vendor = " + mStepCount.getVendor()

+ ", FifoMaxEventCount = " + mStepCount.getFifoMaxEventCount()

+ ", FifoReservedEventCount = " + mStepCount.getFifoReservedEventCount() + ", MinDelay = "

+ mStepCount.getMinDelay() + ", MaximumRange = " + mStepCount.getMaximumRange()

+ ", Power = " + mStepCount.getPower()

+ ", ReportingMode = " + mStepCount.getReportingMode() + ", Resolution = " + mStepCount.getResolution() + ", MaxDelay = " + mStepCount.getMaxDelay();

Log.i(TAG, "芯片信息 : " + info);

mSensorManager.registerListener(this, mStepCount, SensorManager.SENSOR_DELAY_FASTEST);

}

void unRegister() {

mSensorManager.unregisterListener(this);

}

void addStepCounterObserver(Observer observer) {

mStepCounterObservable.addObserver(observer);

}

void clearStepObserver() {

mStepCounterObservable.deleteObservers();

}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)

public void flush() {

mSensorManager.flush(this);

}

private void setStepCount(float count) {

mStepCounterObservable.sendChange(count);

}

@Override

public void onSensorChanged(SensorEvent event) {

if (event.sensor.getType() != SENSER_TYPE_C) {

return;

}

setStepCount(event.values[0]);

}

@Override

public void onAccuracyChanged(Sensor sensor, int accuracy) {

}

}

StepCounterObservable - 可被監(jiān)測的StepCounter數(shù)據(jù)源

public class StepCounterObservable extends Observable {

public void sendChange(float progress) {

setChanged();

notifyObservers(progress);

}

}

activity_main.xml - UI

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

android:id="@+id/tv_step"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Hello World!"

android:textSize="20sp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

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