android中colors.xml颜色设置资源文件的方法

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <color name="colorPrimary">#008577</color>
  <color name="colorPrimaryDark">#00574B</color>
  <color name="colorAccent">#D81B60</color>
  <color name="color_xml">#ff0000</color>
  <color name="color_java">#0000ff</color>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text = "XML文件访问colors资源（红色）"
    android:id = "@+id/tv3"
    android:textColor="@color/color_xml" />
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text = "Java文件访问colors资源（蓝色）"
    android:id = "@+id/tv4" />
</LinearLayout>

package com.example.myapplication;

import android.os.Bundle;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class Color_ActivityDemo extends AppCompatActivity {
  TextView tv4;
  public void onCreate(Bundle saveInstanceState) {
    super.onCreate(saveInstanceState);
    setContentView(R.layout.color_layout);
    tv4 = (TextView) findViewById(R.id.tv4);
    tv4.setTextColor(getResources().getColor(R.color.color_java));
  }
}