使用 Kotlin 语言在 Android Studio 中设置文本的渐变颜色 [英] Set gradient color for text in Android Studio with Kotlin language

问题描述

我有一个文本，我想设置一个渐变颜色作为它的前景.我可以用 XML 来做吗?

I have a text and I want to set a gradient color as its foreground. May I do it in XML?

还是应该在活动中进行?我正在 Android Studio 中使用 Kotlin 进行编程.

Or should I do it in an activity? I am programming with Kotlin in Android Studio.

<androidx.constraintlayout.widget.ConstraintLayout xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#FFFFFF"
        android:gravity="center"
        android:text="Text Color is Gradient"
        android:textColor="#000"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

文件gradient.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
    <gradient
        android:angle="90"
        android:centerColor="#555994"
        android:endColor="#b5b6d2"
        android:startColor="#555994"
        android:type="linear" />

    <corners
        android:radius="0dp"/>

</shape>

我的活动是这样的:

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity


class MainActivity : AppCompatActivity() {

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

    }
}

推荐答案

为了将渐变设置为 Textview 文本颜色，你必须使用 textshader 解析渐变颜色.您可以根据需要自定义颜色.

In order to set the gradient as Textview text color, you have to use textshader with parsing gradients color. You can customise the colors as of your requirement.

 val paint = textView.paint
        val width = paint.measureText(textView.text.toString())
        val textShader: Shader = LinearGradient(0f, 0f, width, textView.textSize, intArrayOf(
            Color.parseColor("#F97C3C"),
            Color.parseColor("#FDB54E"),
            /*Color.parseColor("#64B678"),
            Color.parseColor("#478AEA"),*/
            Color.parseColor("#8446CC")
        ), null, Shader.TileMode.REPEAT)

        textView.paint.setShader(textShader)

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