Android：同时从加速度计和陀螺仪获取数据

Question

我在同时从加速度计和陀螺仪获取数据时遇到了一些问题。我需要使用这些传感器来获取加速度和方向，以便为我正在处理的项目计算相对位置。当两个传感器同时使用时，它会导致一些非常奇怪的数据输出，其中数据每秒只更改一次。当只运行加速度计时，数据并没有好多少，因为它在最快的设置下每秒只变化大约 10 次。该数据被打印到带有每个传感器读数的时间戳的文件中。

我在互联网上找不到教程，尤其是同时使用多个传感器。我需要将每个传感器放在不同的线程上吗？我没有太多使用线程的经验，我怎么能这样做。

Answer 1

您无需将每个传感器放在不同的线程上。你可以使用类 SensorManager 来注册和注销你需要的不同传感器

public class SensorActivity extends Activity, implements SensorEventListener {
 private final SensorManager mSensorManager;
 private final Sensor mAccelerometer;
 private final Sensor mGyroscope;

 public SensorActivity() {
     mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
     mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
     mGyroscope = mSensorManager.getDefaultSensor(TYPE_GYROSCOPE);
 }

 protected void onResume() {
     super.onResume();
     mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
     mSensorManager.registerListener(this, mGyroscope, SensorManager.SENSOR_DELAY_NORMAL);
 }

 protected void onPause() {
     super.onPause();
     mSensorManager.unregisterListener(this);
 }

实现 sensorEventList 处理程序（特别是 onSensorChanged 方法）并检查接收到的数据属于谁：

 public void onSensorChanged(SensorEvent sensorEvent) {
    sensorName = sensorEvent.sensor.getName();
    Log.d(sensorName + ": X: " + sensorEvent.values[0] + "; Y: " + sensorEvent.values[1] + "; Z: " + sensorEvent.values[2] + ";");

}

Answer 2

这个 Kotlin 解决方案源自 Kroka 的解决方案：

class MainActivity : AppCompatActivity(), SensorEventListener {

    private lateinit var mSensorManager:SensorManager
    private lateinit var mAccelerometer :Sensor
    private lateinit var mGyroscope :Sensor

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mSensorManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
        mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)
        mGyroscope = mSensorManager.getDefaultSensor(TYPE_GYROSCOPE)
    }

    override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {

    }
    override fun onSensorChanged(event: SensorEvent?) {
        val sensorName: String = event?.sensor!!.getName();
        Log.d("Sensor",sensorName + ": X: " + event.values[0] + "; Y: " + event.values[1] + "; Z: " + event.values[2] + ";")
    }

    override fun onResume() {
        super.onResume()
        mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL)
        mSensorManager.registerListener(this, mGyroscope, SensorManager.SENSOR_DELAY_NORMAL)
    }

    override fun onPause() {
        super.onPause()
        mSensorManager.unregisterListener(this)
    }

}

Answer 3

Java 代码

import android.content.pm.ActivityInfo;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    TextView textX, textY, textZ;
    SensorManager sensorManager;
    Sensor sensor;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        sensor = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
        textX = findViewById(R.id.textX);
        textY = findViewById(R.id.textY);
        textZ = findViewById(R.id.textZ);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    }
    public void onResume() {
        super.onResume();
        sensorManager.registerListener(gyroListener, sensor, SensorManager.SENSOR_DELAY_NORMAL);
    }
    public void onStop() {
        super.onStop();
        sensorManager.unregisterListener(gyroListener);
    }
    public SensorEventListener gyroListener = new SensorEventListener() {
        public void onAccuracyChanged(Sensor sensor, int acc) {
        }
        public void onSensorChanged(SensorEvent event) {
            float x = event.values[0];
            float y = event.values[1];
            float z = event.values[2];
            textX.setText("X : " + (int) x + " rad/s");
            textY.setText("Y : " + (int) y + " rad/s");
            textZ.setText("Z : " + (int) z + " rad/s");
        }
    };
}

    

XML 文件代码

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">
    <TextView
        android:id="@+id/textX"
        android:layout_width="209dp"
        android:layout_height="79dp"
        android:layout_marginStart="91dp"
        android:layout_marginLeft="91dp"
        android:layout_marginEnd="111dp"
        android:layout_marginRight="111dp"
        android:gravity="center"
        android:text=""
        android:textSize="30sp"
        app:layout_constraintBottom_toTopOf="@+id/textY"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints" />
    <TextView
        android:id="@+id/textY"
        android:layout_width="209dp"
        android:layout_height="79dp"
        android:layout_marginStart="91dp"
        android:layout_marginLeft="91dp"
        android:layout_marginEnd="111dp"
        android:layout_marginRight="111dp"
        android:layout_marginBottom="8dp"
        android:gravity="center"
        android:text=""
        android:textSize="30sp"
        app:layout_constraintBottom_toTopOf="@+id/textZ"
        app:layout_constraintEnd_toEndOf="@+id/textX"
        app:layout_constraintHorizontal_bias="0.445"
        app:layout_constraintStart_toStartOf="@+id/textX"
        app:layout_constraintTop_toBottomOf="@+id/textX"
        tools:ignore="MissingConstraints" />
    <TextView
        android:id="@+id/textZ"
        android:layout_width="209dp"
        android:layout_height="79dp"
        android:layout_marginStart="153dp"
        android:layout_marginLeft="153dp"
        android:layout_marginEnd="49dp"
        android:layout_marginRight="49dp"
        android:layout_marginBottom="241dp"
        android:gravity="center"
        android:text=""
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/textY"
        app:layout_constraintHorizontal_bias="0.757"
        app:layout_constraintStart_toStartOf="@+id/textY"
        app:layout_constraintTop_toBottomOf="@+id/textY"
        tools:ignore="MissingConstraints" />
</android.support.constraint.ConstraintLayout>