[Android Studio] 가속도 센서 받기 - chart 이용

※  chart를 사용하면 x,y,z축이 아닌 통합한 1개의 선만 나타나짐.

 

안드로이드 스튜디오에서 char를 사용하기 전에 추가해 줘야할 것들이 있다.

 

○ chart 설치

    -build.gradle

allprojects{
	repositories{
    	maven{ url "http://jitpack.io"}
        }
}        

   -build.gradle

dependencies{
	compile 'com.github.PhilJay:MPAndroidChart:v3.0.2'
}    

v 3.0.2는 자신의 버전에 맞지 않으면 오류가 난다.

 

 

-MainActivity.java

package org.techtown.accelerometersensor;

import android.annotation.SuppressLint;
import android.graphics.Color;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.app.Activity;
import android.text.Html;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.components.XAxis;
import com.github.mikephil.charting.components.YAxis;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.LineData;
import com.github.mikephil.charting.data.LineDataSet;
import com.github.mikephil.charting.interfaces.datasets.ILineDataSet;
import com.github.mikephil.charting.utils.ColorTemplate;



public class MainActivity extends AppCompatActivity implements SensorEventListener {

    private SensorManager mSensorManager;
    private Sensor mAccelerometer;
    TextView xValue, yValue, zValue;


    private LineChart mChart;
    private Thread thread;
    private boolean plotData = true;


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

        //선을 나타낼 수 있는 가속도 센서 선택
        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);

        if (mAccelerometer != null) {
            //센서를 속도를 설정하여 읽어온다.
            mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_GAME);
        }
        mChart = (LineChart) findViewById(R.id.char1);
        mChart.getDescription().setEnabled(true);
        //mChart.getDescription().setText("Real Time Acclerometer Data");

        //속도 센서 이외에 조작 방지
        mChart.setTouchEnabled(false); //터치
        mChart.setDragEnabled(false); //드래그
        mChart.setScaleXEnabled(false); //확장
        mChart.setDrawGridBackground(false);
        mChart.setPinchZoom(false);
        mChart.setBackgroundColor(android.R.color.white);

        //축생성
        XAxis xAxis = mChart.getXAxis(); //아래
        xAxis.setPosition((XAxis.XAxisPosition.BOTTOM));
        xAxis.setTextSize(10f);
        //xAxis.setDrawGridLines(false);

        YAxis leftAxis = mChart.getAxisLeft();//왼쪽
        //leftAxis.setDrawGridLines(false);

        YAxis rightAxis = mChart.getAxisRight(); //오른쪽
        rightAxis.setEnabled(false);//없앰

        xValue = (TextView) findViewById(R.id.xValue);
        yValue = (TextView) findViewById(R.id.yValue);
        zValue = (TextView) findViewById(R.id.zValue);



        LineData data = new LineData();
        data.setValueTextColor(Color.WHITE);
        mChart.setData(data);


    }


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

    }

    private void addEntry(SensorEvent event) {
        LineData data = mChart.getData();

        if (data != null) {
            //0번째 위치의 데이터셋을 가져옴
            ILineDataSet set = data.getDataSetByIndex(0);

            if (set == null) { // 0에 위치한 값이 없으면
                set = createSet();
                data.addDataSet(set);
            }

            data.addEntry(new Entry(set.getEntryCount(), event.values[0] + 5), 0);
            data.notifyDataChanged(); // data의 값 변동을 감지함

            mChart.notifyDataSetChanged(); //chart 변동 감지
            mChart.setVisibleXRangeMaximum(150); //xc에 최대 데이터 갯수
            mChart.moveViewToX(data.getEntryCount());//최근 추가한 데이터 위치로 chart이동

           // Log.d(TAG, "onSensorChanged: X: " + event.values[0]+ "Y : " + event.values[1]+ "Z : " + event.values[2]);

            xValue.setText("xValue: " + event.values[0]);
            yValue.setText("yValue: " + event.values[1]);
            zValue.setText("zValue: " + event.values[2]);
            startPlot(); //실시간으로 데이터를 위한 스레드
        }
    }

    private void startPlot(){
        if(thread!=null){
            thread.interrupt();
        }

        thread = new Thread(new Runnable() {
            @Override
            public void run() {
                while(true){
                    plotData = true;
                    try{
                        Thread.sleep(10);
                    }catch(InterruptedException e){
                        e.printStackTrace();
                    }
                }
            }
        });

        thread.start();
    }
    protected void onPause(){
        super.onPause();
        if(thread!=null){
            thread.interrupt();
        }
        mSensorManager.unregisterListener(this); // 센서 반납
    }

    private LineDataSet createSet() {

        LineDataSet set = new LineDataSet(null, "X축");

        set.setAxisDependency(YAxis.AxisDependency.LEFT);
        set.setColor(Color.RED);//라인색
        set.setLineWidth(2f);
        set.setFillColor(Color.RED);
        // set.Mode(LineDataSet.Mode.CUBIC_BEZIER);
        set.setCubicIntensity(0.2f);
        return set;

    }


    //다수의 데이터를 읽기위한 메소드
    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {
        if (plotData) {
            addEntry(sensorEvent);
            plotData = false;

        }
    }

}

 

 

- 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">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_marginTop="0dp"
        android:background="#FCFCFD"
        android:orientation="horizontal"></LinearLayout>

    <com.github.mikephil.charting.charts.LineChart
        android:id="@+id/char1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="80dp"
        android:animationCache="false"
        android:background="#00F7FCFC" />

</RelativeLayout>