ANDROID_MARS学习笔记_S05_004_过滤杂质，得到真正的加速度

时间：2021-12-10 14:45:04

一、简介

ANDROID_MARS学习笔记_S05_004_过滤杂质，得到真正的加速度

二、代码
1.java

(1)MainActivity.java

 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;

 public class MainActivity extends Activity {

     /** Called when the activity is first created. */

     private SensorManager sensorManager;

     private Sensor accelerometerSensor;

     private float gravity [] = new float[3];

     private float linear_acceleration [] = new float[3];

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);

         accelerometerSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

         sensorManager.registerListener(new SensorEventListener() {

             public void onSensorChanged(SensorEvent event) {

                 /*System.out.println("x---" + event.values[0]);

                 System.out.println("y---" + event.values[1]);

                 System.out.println("z---" + event.values[2]);*/

                   final float alpha = 0.8f;

                   //用滤波器过滤掉杂质

                   gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];

                   gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];

                   gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];

                   linear_acceleration[0] = event.values[0] - gravity[0];

                   linear_acceleration[1] = event.values[1] - gravity[1];

                   linear_acceleration[2] = event.values[2] - gravity[2];

                   System.out.println(linear_acceleration[0]);

                   System.out.println(linear_acceleration[1]);

                   System.out.println(linear_acceleration[2]);

 //                  System.out.println(gravity[0]);

 //                  System.out.println(gravity[1]);

 //                  System.out.println(gravity[2]);

             }

             public void onAccuracyChanged(Sensor sensor, int accuracy) {

             }

         }, accelerometerSensor, SensorManager.SENSOR_DELAY_NORMAL);

     }

 }

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