英文:
How to make an Android class in java that returns device angle
问题
我正在尝试制作一个使用设备角度的应用程序。我正在努力找出如何创建一个带有函数的类，我可以在另一个文件中调用该函数，以返回设备的Y轴角度。我以前从未使用过传感器，并且在尝试设置它们时遇到了问题。我将从中调用该函数的文件正在前台运行。是否有人知道如何做到这一点并且可以分享一些代码？谢谢！
英文:
I am trying to make an app that uses the devices angle. I am trying to figure out how to make a class with a function that I can call in another file that will return the devices Y angle. I have never used sensor before and I have had trouble trying to set them up. The file I will be calling the function from is running in the foreground. Does anyone know how to do this and can share some code? Thank You!
答案1
得分: 0
这是您提供的代码的翻译：
你可以尝试查看Android Google CodeLabs。此外，我在互联网上找到了一个解决方案，稍微进行了修改，但我不确定显示的数据是否始终正确。此示例应用程序始终跟踪设备的旋转，因此，如果您想要一个返回旋转角度的函数，您需要稍微重构代码。
MainActivity.java：
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private TextView textViewToDisplayRotation;
private float[] acc = new float[3];
private float[] mags = new float[3];
private float[] values = new float[3];
SensorManager sManager;
private SensorEventListener mySensorEventListener = new SensorEventListener() {
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
public void onSensorChanged(SensorEvent event) {
switch (event.sensor.getType()) {
case Sensor.TYPE_MAGNETIC_FIELD:
mags = event.values.clone();
break;
case Sensor.TYPE_ACCELEROMETER:
acc = event.values.clone();
break;
}
if (mags != null && acc != null) {
float[] gravity = new float[9];
float[] magnetic = new float[9];
SensorManager.getRotationMatrix(gravity, magnetic, acc, mags);
float[] outGravity = new float[9];
SensorManager.remapCoordinateSystem(gravity,
SensorManager.AXIS_X,
SensorManager.AXIS_Z,
outGravity);
SensorManager.getOrientation(outGravity, values);
float azimuth = values[0] * 57.2957795f;
float pitch = values[1] * 57.2957795f;
float roll = values[2] * 57.2957795f;
textViewToDisplayRotation.setText("X = " + azimuth + "\nY = " + pitch + "\nZ = " + roll);
mags = null;
acc = null;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sManager = (SensorManager) getSystemService(SENSOR_SERVICE);
textViewToDisplayRotation = findViewById(R.id.textViewToDisplayRotation);
}
@Override
protected void onResume() {
super.onResume();
sManager.registerListener(mySensorEventListener,
sManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
sManager.registerListener(mySensorEventListener,
sManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD),
SensorManager.SENSOR_DELAY_NORMAL);
}
}
main_activity.xml：
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textViewToDisplayRotation"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="40sp" />
英文:
You can try to check Android google CodeLabs. Also I found on the internet one solution, I changed it a little bit but I am not sure if the displayed data is always correct. This sample app tracks device rotation all the time so If You want to have a function that returns rotation You have to refactor code a little.
MainActivity.java:
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity
{
private TextView textViewToDisplayRotation;
private float[] acc = new float[3];
private float[] mags = new float[3];
private float[] values = new float[3];
SensorManager sManager;
private SensorEventListener mySensorEventListener = new SensorEventListener()
{
public void onAccuracyChanged(Sensor sensor, int accuracy)
{
}
public void onSensorChanged(SensorEvent event)
{
switch (event.sensor.getType())
{
case Sensor.TYPE_MAGNETIC_FIELD:
mags = event.values.clone();
break;
case Sensor.TYPE_ACCELEROMETER:
acc = event.values.clone();
break;
}
if (mags != null && acc != null)
{
float[] gravity = new float[9];
float[] magnetic = new float[9];
SensorManager.getRotationMatrix(gravity, magnetic, acc, mags);
float[] outGravity = new float[9];
SensorManager.remapCoordinateSystem(gravity,
SensorManager.AXIS_X,
SensorManager.AXIS_Z,
outGravity);
SensorManager.getOrientation(outGravity, values);
float azimuth = values[0] * 57.2957795f;
float pitch = values[1] * 57.2957795f;
float roll = values[2] * 57.2957795f;
textViewToDisplayRotation.setText("X = " + azimuth + "\nY = " + pitch + "\nZ = " + roll);
mags = null;
acc = null;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sManager = (SensorManager) getSystemService(SENSOR_SERVICE);
textViewToDisplayRotation = findViewById(R.id.textViewToDisplayRotation);
}
@Override
protected void onResume()
{
super.onResume();
sManager.registerListener(mySensorEventListener,
sManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
sManager.registerListener(mySensorEventListener,
sManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD),
SensorManager.SENSOR_DELAY_NORMAL);
}
}
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textViewToDisplayRotation"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="40sp" />
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