public static final long _NORMAL = 0;
时间: 2023-06-13 22:06:12 浏览: 57
这是一个 Java 中定义常量的语句,其中 `public` 表示该常量可以被其他类访问,`static` 表示该常量是静态的,可以通过类名直接访问,`final` 表示该常量是不可变的,其值不能被修改,`long` 表示该常量是一个长整型数值类型,`_NORMAL` 是常量名,其值为 0。这个常量可能是用来表示某种状态或标识符的,具体作用要看它在程序中的使用情况。
相关问题
生成温室大棚的安卓开发代码
针对您的需求,为了生成温室大棚的安卓开发代码,需要您提供更加具体的需求和功能。以下是一些可能需要实现的功能和对应的代码实现:
1. 传感器读取:连接传感器并读取传感器数据,例如温度、湿度等。以下是一个读取温度传感器数据的示例代码:
```java
private SensorManager mSensorManager;
private Sensor mTemperatureSensor;
private TextView mTemperatureTextView;
// 初始化传感器
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mTemperatureSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);
// 注册传感器监听器
mSensorManager.registerListener(new SensorEventListener() {
@Override
public void onSensorChanged(SensorEvent event) {
float temperature = event.values[0];
mTemperatureTextView.setText("Temperature: " + temperature + "°C");
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// do nothing
}
}, mTemperatureSensor, SensorManager.SENSOR_DELAY_NORMAL);
```
2. 数据存储:将传感器读取的数据保存到本地或云端数据库中。以下是一个使用SQLite数据库进行数据存储的示例代码:
```java
public class SensorDataDbHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "sensor_data.db";
private static final int DATABASE_VERSION = 1;
public static final String TABLE_NAME = "sensor_data";
public static final String COLUMN_NAME_TIMESTAMP = "timestamp";
public static final String COLUMN_NAME_TEMPERATURE = "temperature";
public static final String COLUMN_NAME_HUMIDITY = "humidity";
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + TABLE_NAME + " (" +
COLUMN_NAME_TIMESTAMP + " INTEGER PRIMARY KEY," +
COLUMN_NAME_TEMPERATURE + " REAL," +
COLUMN_NAME_HUMIDITY + " REAL)";
public SensorDataDbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(SQL_CREATE_ENTRIES);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// do nothing
}
public void insertSensorData(long timestamp, float temperature, float humidity) {
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_NAME_TIMESTAMP, timestamp);
values.put(COLUMN_NAME_TEMPERATURE, temperature);
values.put(COLUMN_NAME_HUMIDITY, humidity);
db.insert(TABLE_NAME, null, values);
}
}
```
3. 用户界面:设计并实现用户界面,用于显示传感器数据和控制大棚设备。以下是一个使用Android布局文件设计用户界面的示例代码:
```xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/temperature_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/humidity_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/turn_on_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Turn On" />
<Button
android:id="@+id/turn_off_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Turn Off" />
</LinearLayout>
```
以上是一些可能需要实现的功能和对应的代码实现,您可以根据具体需求进行修改和扩展。希望能对您有所帮助。
实现球的光照模型代码Java
以下是一个简单的球的光照模型代码示例,使用Java语言编写:
```java
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class SphereLighting extends JPanel {
private static final long serialVersionUID = 1L;
private final int WIDTH = 640;
private final int HEIGHT = 480;
private final double LIGHT_X = 0;
private final double LIGHT_Y = 0;
private final double LIGHT_Z = 100;
private final double AMBIENT = 0.2;
private final double DIFFUSE = 0.5;
private final double SPECULAR = 0.3;
private final double SPECULAR_POWER = 32;
private final int SPHERE_RADIUS = 100;
private final int SPHERE_X = WIDTH / 2;
private final int SPHERE_Y = HEIGHT / 2;
private final Color SPHERE_COLOR = Color.WHITE;
public SphereLighting() {
JFrame frame = new JFrame("Sphere Lighting");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(WIDTH, HEIGHT);
frame.add(this);
frame.setVisible(true);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(SPHERE_COLOR);
for (int x = -SPHERE_RADIUS; x <= SPHERE_RADIUS; x++) {
for (int y = -SPHERE_RADIUS; y <= SPHERE_RADIUS; y++) {
double z = Math.sqrt(SPHERE_RADIUS * SPHERE_RADIUS - x * x - y * y);
if (!Double.isNaN(z)) {
double[] normal = { x, y, z };
double[] light = { LIGHT_X, LIGHT_Y, LIGHT_Z };
double[] view = { 0, 0, -1 };
double[] h = { light[0] + view[0], light[1] + view[1], light[2] + view[2] };
double[] unitNormal = normalize(normal);
double[] unitLight = normalize(light);
double[] unitView = normalize(view);
double[] unitH = normalize(h);
double ambient = AMBIENT;
double diffuse = Math.max(0, dot(unitNormal, unitLight)) * DIFFUSE;
double specular = Math.pow(Math.max(0, dot(unitNormal, unitH)), SPECULAR_POWER) * SPECULAR;
double intensity = ambient + diffuse + specular;
int red = (int) (SPHERE_COLOR.getRed() * intensity);
int green = (int) (SPHERE_COLOR.getGreen() * intensity);
int blue = (int) (SPHERE_COLOR.getBlue() * intensity);
g.setColor(new Color(red, green, blue));
g.drawLine(SPHERE_X + x, SPHERE_Y + y, SPHERE_X + x, SPHERE_Y + y);
}
}
}
}
private double[] normalize(double[] v) {
double length = Math.sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
return new double[] { v[0] / length, v[1] / length, v[2] / length };
}
private double dot(double[] a, double[] b) {
return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
}
public static void main(String[] args) {
new SphereLighting();
}
}
```
该代码创建了一个简单的GUI窗口,其中绘制了一个白色的球体。在每个像素上进行光照计算,根据环境光、漫反射和镜面反射计算出颜色,并将该颜色用于像素。这里使用了一个简单的Phong光照模型,包括环境光、漫反射和镜面反射。