android - 如何将 HSL 颜色转换为其他颜色，如 RGB、Hex？

Question

我正在开发颜色转换器应用程序，其中一个人在 EditText 中输入色相、饱和度和亮度值。单击转换按钮时，HSL 值将转换为 RGB 和十六进制。然后将这些值设置为 TextViews。我的问题是如何将 HSL 颜色值转换为其他颜色，如 HEX、RGB 等。

这是我的代码:activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:id="@+id/backgroundLin"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/hueEt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="000"
            android:inputType="numberDecimal"
            android:maxLength="6"
            android:padding="5dp"
            android:textAlignment="center" />

        <EditText
            android:id="@+id/satEt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="000"
            android:inputType="numberDecimal"
            android:maxLength="6"
            android:padding="5dp"
            android:textAlignment="center" />

        <EditText
            android:id="@+id/ligEt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="000"
            android:inputType="numberDecimal"
            android:maxLength="6"
            android:padding="5dp"
            android:textAlignment="center" />
    </LinearLayout>

    <Button
        android:id="@+id/convertBtn"
        style="@style/Base.Widget.AppCompat.Button.Colored"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:drawablePadding="10dp"
        android:text="Convert"
        android:textSize="18sp" />

    <View
        android:id="@+id/previewView"
        android:layout_width="match_parent"
        android:layout_height="100dp" />

    <TextView
        android:id="@+id/rgbTv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/hexTv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

主 Activity .java

package com.blogspot.atifsoftwares.myapplication;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText mHueEt, mSaturationEt, mLightnessEt;
    TextView mRgbTv, mHexTv;
    View mPreviewView;
    Button mConvertBtn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mHueEt = findViewById(R.id.hueEt);
        mSaturationEt = findViewById(R.id.satEt);
        mLightnessEt = findViewById(R.id.ligEt);
        mConvertBtn = findViewById(R.id.convertBtn);
        mRgbTv = findViewById(R.id.rgbTv);
        mHexTv = findViewById(R.id.hexTv);
        mPreviewView = findViewById(R.id.previewView);

        mConvertBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                float hue = Float.parseFloat(mHueEt.getText().toString().trim());
                float saturation = Float.parseFloat(mSaturationEt.getText().toString().trim());
                float lightness = Float.parseFloat(mLightnessEt.getText().toString().trim());

                //HSL
                int color = Color.HSVToColor(new float[]{hue, saturation, lightness});
                //RGB
                int red = Color.red(color);
                int green = Color.green(color);
                int blue = Color.blue(color);
                int alpha = Color.alpha(color);
                //Hex
                String hex = String.format("#%02x%02x%02x", red, green, blue);

                try {
                    mHexTv.setText("Hex: " + hex);
                    mRgbTv.setText("RGB: " + red + ", " + green + ", " + blue);
                    mPreviewView.setBackgroundColor(color);
                } catch (Exception e) {
                    Toast.makeText(MainActivity.this, "" + e.getMessage(), Toast.LENGTH_SHORT).show();
                }

            }
        });
    }
}

Answer 1

使用下面的方法

Color color = Color.HSVToColor( new float[]{ hue, saturation , lightness } ) );

并将颜色转换为 rgb 使用

int red = Color.red(color );
int green = Color.green(color );
int blue = Color.blue(color );
int alpha = Color.alpha(color );