安卓计步器的简单实现
作者：互联网
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：
1 <?xml version="1.0" encoding="utf-8"?> 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:app="http://schemas.android.com/apk/res-auto" 4 xmlns:tools="http://schemas.android.com/tools" 5 android:layout_width="match_parent" 6 android:layout_height="match_parent" 7 tools:context=".MainActivity"> 8 9 <ScrollView 10 android:layout_width="match_parent" 11 android:layout_height="wrap_content"> 12 </ScrollView> 13 14 <ListView 15 android:id="@+id/listview" 16 android:layout_width="match_parent" 17 android:layout_height="400dp"> 18 </ListView> 19 20 <TextView 21 android:id="@+id/steps" 22 android:layout_below="@+id/listview" 23 android:textSize="25dp" 24 android:layout_width="wrap_content" 25 android:layout_height="wrap_content" 26 android:layout_gravity="center_horizontal" /> 27 28 </RelativeLayout>
MainActivity：
1 package com.mingrisoft.countsteps;
2
3 import android.content.ContentValues;
4 import android.database.Cursor;
5 import android.database.sqlite.SQLiteDatabase;
6 import android.hardware.Sensor;
7 import android.hardware.SensorEvent;
8 import android.hardware.SensorEventListener;
9 import android.hardware.SensorManager;
10 import android.os.Handler;
11 import android.os.Message;
12 import android.provider.ContactsContract;
13 import android.provider.ContactsContract.Data;
14 import android.provider.FontsContract;
15 import android.sax.EndElementListener;
16 import android.support.v7.app.AppCompatActivity;
17 import android.os.Bundle;
18 import android.text.format.DateFormat;
19 import android.util.Log;
20 import android.widget.TextView;
21
22 import java.text.SimpleDateFormat;
23 import java.util.Date;
24 import java.util.List;
25
26 public class MainActivity extends AppCompatActivity implements SensorEventListener{//不实现SensorEventListener接口在真机上会闪退
27 SensorManager mSensorManager;//管理器实例
28 Sensor stepCounter;//传感器
29 float mSteps;//截止当天0点时步数/重启手机到当前为止的步数
30 TextView steps;//显示步数
31 TextView time;//显示时间
32 private DBOpenHelper dbOpenHelper;//定义DBOpenHelper
33
34 @Override
35 protected void onCreate(Bundle savedInstanceState) {
36 super.onCreate(savedInstanceState);
37 setContentView(R.layout.activity_main);
38
39 // 获取SensorManager管理器实例
40 mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
41 dbOpenHelper = new DBOpenHelper(MainActivity.this,"db_step",null,1);
42 steps = (TextView)findViewById(R.id.steps);
43 time = (TextView)findViewById(R.id.time);
44
45 // 获取计步器sensor
46 stepCounter = mSensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
47 if(stepCounter != null){
48 // 如果sensor找到，则注册监听器
49 mSensorManager.registerListener((SensorEventListener) this,stepCounter,mSensorManager.SENSOR_DELAY_GAME);
50 }
51 else{
52 Log.e("hemeiwolong","no step counter sensor found");
53 }
54 }
55
56 //步数变化时
57 public void onSensorChanged(SensorEvent event) {
58 Cursor cursor = dbOpenHelper.getReadableDatabase().query("tb_step",null,null, null, null,null,null);
59 // while (cursor.moveToNext()) {
60 // Log.i("fffff", cursor.getString(0) + cursor.getString(1) + cursor.getString(2));
61 // }
62 //获取今天的日期，统一格式为yyyy/MM/dd
63 String strdate = new SimpleDateFormat("yyyy/MM/dd").format(new Date());
64
65 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
66 insertData(dbOpenHelper.getReadableDatabase(), strdate, String.valueOf(event.values[0]));
67 mSteps = event.values[0];
68 } else {
69 if (cursor.moveToLast()) {
70 if (event.values[0] < Float.parseFloat(cursor.getString(2))) { //说明手机重启过
71 //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
72 dbOpenHelper.getReadableDatabase().delete("tb_step",null,null);
73 insertData(dbOpenHelper.getReadableDatabase(), strdate, String.valueOf(event.values[0]));
74
75 if (cursor.moveToLast()) {
76 mSteps = Float.parseFloat(cursor.getString(2));
77 }
78 } 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
79 mSteps = Float.parseFloat(cursor.getString(2));
80 }
81 }
82 }
83
84 //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
85 float showSteps = event.values[0] - mSteps;
86 steps.setText("你已经走了"+String.valueOf((int)showSteps)+"步");
87
88 //到了0点，把到目前为止所走的总步数加入数据库
89 String time = "00:00:00";
90 if (time.equals(new SimpleDateFormat("HH:mm:ss").format(new Date()))){
91 insertData(dbOpenHelper.getReadableDatabase(), strdate, String.valueOf(event.values[0]));
92 mSteps = event.values[0];
93 }
94 }
95
96 @Override
97 public void onAccuracyChanged(Sensor sensor, int accuracy) {
98
99 }
100
101 //向数据库添加记录
102 private void insertData(SQLiteDatabase sqLiteDatabase, String day, String steps) {
103 ContentValues contentValues = new ContentValues();
104 contentValues.put("day", day);
105 contentValues.put("steps", steps);
106
107 sqLiteDatabase.insert("tb_step",null,contentValues);
108 }
109 }
DBOpenHelper：
1 package com.mingrisoft.countsteps;
2
3 import android.content.Context;
4 import android.database.sqlite.SQLiteDatabase;
5 import android.database.sqlite.SQLiteOpenHelper;
6 import android.util.Log;
7
8 public class DBOpenHelper extends SQLiteOpenHelper {
9 //定义创建计步表的SQL语句，每列内容分别为序号，日期，步数
10 final String CREATE_STEPS = "create table tb_step (_id integer primary key autoincrement," +
11 "day, steps)";
12
13 //重写构造方法，并设置工厂为null
14 public DBOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
15 super(context, name, null, version);
16 }
17
18 //创建计步表
19 @Override
20 public void onCreate(SQLiteDatabase db) {
21 db.execSQL(CREATE_STEPS);
22 }
23
24 //重写基类的onUpgrade（）方法，以便数据库版本更新
25 @Override
26 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
27 Log.i("计步表","版本更新"+oldVersion+"-->"+newVersion);
28 }
29 }
manifests：
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 3 package="com.mingrisoft.countsteps"> 4 5 <uses-feature android:name="android.hardware.sensor.stepcounter"/> 6 <uses-feature android:name="feature:android.hardware.sensor.stepdetector"/> 7 8 <application 9 android:allowBackup="true" 10 android:icon="@mipmap/ic_launcher" 11 android:label="@string/app_name" 12 android:roundIcon="@mipmap/ic_launcher_round" 13 android:supportsRtl="true" 14 android:theme="@style/AppTheme"> 15 <activity android:name=".MainActivity"> 16 <intent-filter> 17 <action android:name="android.intent.action.MAIN" /> 18 19 <category android:name="android.intent.category.LAUNCHER" /> 20 </intent-filter> 21 </activity> 22 </application> 23 24 </manifest>
标签：String,安卓,简单,cursor,import,计步器,android,null,步数 来源： https://www.cnblogs.com/hemeiwolong/p/12631585.html