安卓计步器的简单实现

参考链接：https://blog.csdn.net/fjnu_se/article/details/90906209

大体思路：在参考链接的基础上，我去掉了显示时间的线程。用android自带计步传感器进行计步，用一个数据库存储每日0点时计步器的总步数，由此可以计算出当日的步数。如果手机重启过，就清除掉所有的旧记录。现有问题是只有在app运行的情况下才能把当日0点时计步器的总步数加入数据库。

运行效果图：

结构目录：

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </ScrollView>

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="400dp">
    </ListView>

    <TextView
        android:id="@+id/steps"
        android:layout_below="@+id/listview"
        android:textSize="25dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" />

</RelativeLayout>

MainActivity：

package com.mingrisoft.countsteps;

import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Handler;
import android.os.Message;
import android.provider.ContactsContract;
import android.provider.ContactsContract.Data;
import android.provider.FontsContract;
import android.sax.EndElementListener;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.util.Log;
import android.widget.TextView;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

public class MainActivity extends AppCompatActivity implements SensorEventListener{//不实现SensorEventListener接口在真机上会闪退
    SensorManager mSensorManager;//管理器实例
    Sensor stepCounter;//传感器
    float mSteps;//截止当天0点时步数/重启手机到当前为止的步数
    TextView steps;//显示步数
    TextView time;//显示时间
    private DBOpenHelper dbOpenHelper;//定义DBOpenHelper

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

        // 获取SensorManager管理器实例
        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        dbOpenHelper = new DBOpenHelper(MainActivity.this,"db_step",null,1);
        steps = (TextView)findViewById(R.id.steps);
        time = (TextView)findViewById(R.id.time);

        // 获取计步器sensor
        stepCounter = mSensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
        if(stepCounter != null){
            // 如果sensor找到，则注册监听器
            mSensorManager.registerListener((SensorEventListener) this,stepCounter,mSensorManager.SENSOR_DELAY_GAME);
        }
        else{
            Log.e("hemeiwolong","no step counter sensor found");
        }
    }

    //步数变化时
    public void onSensorChanged(SensorEvent event) {
        Cursor cursor = dbOpenHelper.getReadableDatabase().query("tb_step",null,null, null, null,null,null);
//        while (cursor.moveToNext()) {
//            Log.i("fffff", cursor.getString(0) + cursor.getString(1) + cursor.getString(2));
//        }
        //获取今天的日期，统一格式为yyyy/MM/dd
        String strdate = new SimpleDateFormat("yyyy/MM/dd").format(new Date());

        if (cursor.getCount() == 0) {   //如果计步表为空，则把现在为止的总步数加入数据库
            insertData(dbOpenHelper.getReadableDatabase(), strdate, String.valueOf(event.values[0]));
            mSteps = event.values[0];
        } else {
            if (cursor.moveToLast()) {
                if (event.values[0] < Float.parseFloat(cursor.getString(2))) {  //说明手机重启过
                    //删除旧的所有步数记录，把现在的总步数加入数据库，注意表名打错的话会闪退
                    dbOpenHelper.getReadableDatabase().delete("tb_step",null,null);
                    insertData(dbOpenHelper.getReadableDatabase(), strdate, String.valueOf(event.values[0]));

                    if (cursor.moveToLast()) {
                        mSteps = Float.parseFloat(cursor.getString(2));
                    }
                } else {    //如果今天没重启过，则取最新的数据作为今天计步的起始值
                    mSteps = Float.parseFloat(cursor.getString(2));
                }
            }
        }

        //今天所走步数 = 目前的总步数 - 今天0点为止的总步数，如果今天重启过，只记录重启到现在所走的步数
        float showSteps = event.values[0] - mSteps;
        steps.setText("你已经走了"+String.valueOf((int)showSteps)+"步");

        //到了0点，把到目前为止所走的总步数加入数据库
        String time = "00:00:00";
        if (time.equals(new SimpleDateFormat("HH:mm:ss").format(new Date()))){
            insertData(dbOpenHelper.getReadableDatabase(), strdate, String.valueOf(event.values[0]));
            mSteps = event.values[0];
        }
    }

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

    }

    //向数据库添加记录
    private void insertData(SQLiteDatabase sqLiteDatabase, String day, String steps) {
        ContentValues contentValues = new ContentValues();
        contentValues.put("day", day);
        contentValues.put("steps", steps);

        sqLiteDatabase.insert("tb_step",null,contentValues);
    }
}

DBOpenHelper：

package com.mingrisoft.countsteps;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DBOpenHelper extends SQLiteOpenHelper {
    //定义创建计步表的SQL语句，每列内容分别为序号，日期，步数
    final String CREATE_STEPS = "create table tb_step (_id integer primary key autoincrement," +
            "day, steps)";

    //重写构造方法，并设置工厂为null
    public DBOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, null, version);
    }

    //创建计步表
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_STEPS);
    }

    //重写基类的onUpgrade（）方法，以便数据库版本更新
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        Log.i("计步表","版本更新"+oldVersion+"-->"+newVersion);
    }
}

manifests：

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

    <uses-feature android:name="android.hardware.sensor.stepcounter"/>
    <uses-feature android:name="feature:android.hardware.sensor.stepdetector"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        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>
        </activity>
    </application>

</manifest>