android - android计步器延迟

Question

我正在开发一个安卓计步器，它在我按下按钮时开始计数，在我再次按下按钮时停止。问题是计数器总是错过我使用 android kitkat 4.4 中引入的计步器传感器的前几步。我也尝试了步进检测器传感器，但结果相同。 我尝试在将传感器注册为最快、游戏、正常时更改延迟，我什至尝试将延迟设置为 0，但没有任何效果

有什么办法可以解决这个问题吗？

这是一个简单的应用程序，可以显示我的问题 https://github.com/omaressameldin/simplestepcounter

MainActivity.java

package com.example.oessa_000.simplestepcounter;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity implements SensorEventListener {
    private SensorManager mSensorManager;
    private Sensor mStepCounterSensor;

    ToggleButton countToggle;
    TextView stepView;

    private int stepCount = 0;
    boolean toggle = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        mStepCounterSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);

        stepView = (TextView)  findViewById(R.id.stepView);
         countToggle = (ToggleButton) findViewById(R.id.countToggle);
        ;

        countToggle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                toggle = !toggle ;
                if(toggle){
                startListening();
                }
                else{
                    stopListening();
                }
            }
        });
    }
    protected void startListening() {

        mSensorManager.registerListener(this, mStepCounterSensor, SensorManager.SENSOR_DELAY_NORMAL);


    }

    protected void stopListening() {
        mSensorManager.unregisterListener(this, mStepCounterSensor);
    }



    public void onResume() {
        super.onResume();

    }


    @Override
    public void onSensorChanged(SensorEvent event) {
        Sensor sensor = event.sensor;
        switch(sensor.getType()) {
            case Sensor.TYPE_STEP_COUNTER:
                if (toggle){
                    stepCount++;
                    stepView.setText("Step Count: " + stepCount);
                }
                break;
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.oessa_000.simplestepcounter.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Step Count: 0"
        android:textSize="15dp"
        android:id="@+id/stepView"

        />
    <ToggleButton
        android:layout_width="200dp"
        android:layout_height="75dp"
        android:layout_centerHorizontal="true"
        android:id="@+id/countToggle"
        android:layout_margin="20dp"
        android:textOff="Not Walking"
        android:textOn="Walking"
        android:layout_below="@+id/stepView"

        />
</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.oessa_000.simplestepcounter">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <uses-feature android:name="android.hardware.sensor.stepcounter" />

        </activity>
    </application>

</manifest>

已编辑:添加了代码 fragment

Answer 1

我意识到将预定义的 stepCounter 传感器用于少量步数(就像我想要的那样)并不是最佳选择，使用加速度计实现计数器会好得多；但是，不建议将其用于构建健身应用程序或任何需要长时间持续计步的应用程序，因为计步传感器中的延迟会忽略误报。

所以这是我使用加速度计实现的计步器

MainActivity.java

package com.example.oessa_000.testcompass;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;

import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.ToggleButton;

public class MainActivity extends Activity implements SensorEventListener{


    // Gravity for accelerometer data
    private float[] gravity = new float[3];
    // smoothed values
    private float[] smoothed = new float[3];
    // sensor manager
    private SensorManager sensorManager;
    // sensor gravity
    private Sensor sensorGravity;
    private double bearing = 0;

    private TextView acc;
    private TextView stepView;
    private TextView thresholdView;
    private SeekBar seek;
    private ToggleButton countToggle;

    private int stepCount;
    private boolean toggle;
    private double prevY;
    private double threshold;
    private boolean ignore;
    private int countdown;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        acc = (TextView) findViewById((R.id.accelerometer));
        thresholdView = (TextView) findViewById((R.id.thresholdView));
        stepView = (TextView) findViewById((R.id.stepView));
        countToggle = (ToggleButton) findViewById(R.id.countToggle);
        seek = (SeekBar) findViewById(R.id.seek);

        seek.setProgress(0);
        seek.incrementProgressBy(1);
        seek.setMax(40);
        // keep screen light on (wake lock light)

        implementListeners();
    }

    protected float[] lowPassFilter( float[] input, float[] output ) {
        if ( output == null ) return input;
        for ( int i=0; i<input.length; i++ ) {
            output[i] = output[i] + 1.0f * (input[i] - output[i]);
        }
        return output;
    }

    @Override
    protected void onStart() {
        super.onStart();
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        sensorGravity = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

        // listen to these sensors
        sensorManager.registerListener(this, sensorGravity,
                SensorManager.SENSOR_DELAY_NORMAL);


    }

    @Override
    protected void onStop() {
        super.onStop();
        // remove listeners
        sensorManager.unregisterListener(this, sensorGravity);
    }







    @Override
    public void onSensorChanged(SensorEvent event) {

        // get accelerometer data
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            // we need to use a low pass filter to make data smoothed
            smoothed = lowPassFilter(event.values, gravity);
            gravity[0] = smoothed[0];
            gravity[1] = smoothed[1];
            gravity[2] = smoothed[2];
            acc.setText("x: "+gravity[0] + " y: " + gravity[1] + " z: " + gravity[2]+ "ignore: "+ ignore + "countdown: "+ countdown);
            if(ignore) {
                countdown--;
                ignore = (countdown < 0)? false : ignore;
            }
            else
                countdown = 22;
            if(toggle && (Math.abs(prevY - gravity[1]) > threshold) && !ignore){
                stepCount++;
                stepView.setText("Step Count: " + stepCount);
                ignore = true;
            }
            prevY = gravity[1];
        }
    }

    public void implementListeners(){
        seek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
            }
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {
                threshold = ((double)seek.getProgress()) * 0.02;
                thresholdView.setText("Threshold: "+ threshold);
            }
        });

        countToggle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                toggle = !toggle ;
                if(toggle){
                    stepCount = 0;
                    countdown = 5;
                    ignore = true;
                    stepView.setText("Step Count: " + stepCount);
                }
            }
        });

    }



    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.oessa_000.testcompass.MainActivity">



    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:layout_below="@+id/degree"
        android:id="@+id/accelerometer"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Step Count: 0"
        android:textSize="24dp"
        android:layout_centerHorizontal="true"
        android:id="@+id/stepView"
        android:layout_below="@+id/accelerometer"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:layout_marginBottom="0dp"
        android:layout_below="@+id/stepView"
        android:id="@+id/thresholdView"
        />

    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/seek"
        android:layout_marginTop="0dp"
        android:layout_below="@+id/thresholdView"
        />

    <ToggleButton
        android:layout_width="200dp"
        android:layout_height="75dp"
        android:layout_centerHorizontal="true"
        android:id="@+id/countToggle"
        android:layout_margin="20dp"
        android:textOff="Not Walking"
        android:textOn="Walking"
        android:layout_below="@+id/seek"

        />
</RelativeLayout>

调整阈值设置传感器的灵敏度:)

引用:http://nebomusic.net/androidlessons/Pedometer_Project.pdf