如何将我的按钮设置为背景的随机颜色。 Android

How can set my button a random color to the background. Android

抱歉我的英语不好我是 android 的初学者,现在我被卡住了。

现在我的问题是如何使用 OnClickListener 将随机颜色设置为背景。你能帮我解决这个问题吗?

我有一个 class (Kleurenpalet.java)

 package com.example.pstek.randomcolor;

import android.graphics.Color;

import java.util.Random;

public class Kleurenpalet{

    private static String[] kleur = {
            "#39add1", // light blue
            "#3079ab", // dark blue
            "#3FD52D", // green
            "FFFF0000", // red

            ""};

    public  int getRandomColor() {
        Random rand = new Random();
        int color = rand.nextInt(kleur.length);

        return Color.parseColor(kleur[color]);
    }

}

我有我的主要 class :

package com.example.pstek.tegeltjeswijsheid;

import android.support.constraint.ConstraintLayout;
import android.support.constraint.solver.widgets.ConstraintWidget;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Layout;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Random;

public class MainActivity extends AppCompatActivity {
    private ConstraintLayout layout;
    private Button randombutton;
    int randomColor = new Kleurenpalet().getRandomColor();



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

        layout = findViewById(R.id.layout);

        randombutton = findViewById(R.id.button);



        randombutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                layout.setBackgroundColor(ContextCompat.getColor(getApplicationContext(), ;
            }
        });
    }
}

也许用初始化颜色调用setBackgroundColor

layout.setBackgroundColor(randomColor);

或每次不同:

layout.setBackgroundColor(new Kleurenpalet().getRandomColor());

我不明白你想在这里做什么:

layout.setBackgroundColor(ContextCompat.getColor(getApplicationContext(), ;

你为什么把 space 留在那里?此外,如果您在 Kleurenpalet 中解析颜色,则必须不使用 ContextCompat。只需像这样设置颜色:

layout.setBackgroundColor(randomColor);

ContextCompat从资源文件解析颜色,例如:

layout.setBackgroundColor(
        ContextCompat.getColor(
            getApplicationContext(), 
            R.color.colorPrimary
    )
);

在 MainActivity 代码中:

  public class MainActivity extends AppCompatActivity {
  private ConstraintLayout layout;
  private Button randombutton;

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

    layout = findViewById(R.id.layout);

    randombutton = findViewById(R.id.button);



    randombutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int randomColor = new Kleurenpalet().getRandomColor();
            layout.setBackgroundColor(randomColor);
        }
     });
    }
    }

您必须将 "Random Num" 和 "layout set Color" 放入按钮点击事件中:

randombutton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int randomColor = new Kleurenpalet().getRandomColor();
            layout.setBackgroundColor(randomColor);
        }
     });