Android -将传感器数据保存到文件

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Environment;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class SensorDataLogger implements SensorEventListener {
    private SensorManager sensorManager;
    private Sensor accelerometer;
    private FileOutputStream fileOutputStream;

    public SensorDataLogger() {
        // 获取传感器管理器
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        // 获取加速度传感器
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    }

    public void startLogging() {
        // 注册传感器监听器
        sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
        // 创建文件
        File file = new File(Environment.getExternalStorageDirectory(), "sensor_data.txt");
        try {
            // 打开文件输出流
            fileOutputStream = new FileOutputStream(file);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void stopLogging() {
        // 关闭文件输出流
        try {
            fileOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 取消注册传感器监听器
        sensorManager.unregisterListener(this);
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            // 将传感器数据转换为字符串
            String data = event.values[0] + "," + event.values[1] + "," + event.values[2] + "\n";
            try {
                // 将传感器数据写入文件
                fileOutputStream.write(data.getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // 精度变化时的处理
    }
}