10颜色随机

最新推荐文章于 2021-08-04 01:26:15 发布

原创最新推荐文章于 2021-08-04 01:26:15 发布 · 230 阅读

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#安卓开发 #10颜色随机-纯ja

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本文介绍了一个使用Android实现的动态布局示例，通过随机颜色填充TextView组件，并调整其高度权重，展示了如何在运行时创建多彩的垂直线性布局。

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这里写图片描述

package com.example.lesson4_dynamic;

import java.util.Random;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);

        Random random = new Random();

        for (int j = 0; j < 10; j++) {
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    LayoutParams.MATCH_PARENT, 0, j + 10);
            int r = random.nextInt(256);
            int g = random.nextInt(256);
            int b = random.nextInt(256);

            TextView textView = new TextView(this);
            textView.setLayoutParams(params);
            int color = Color.rgb(r, g, b);
            textView.setBackgroundColor(color);
            layout.addView(textView);

        }
        setContentView(layout);

    }

}

“`
package com.example.lesson4_dynamic;

import java.util.Random;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);

    Random random = new Random();

    for (int j = 0; j < 30; j++) {
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, 0, j + 10);
        int r = random.nextInt(256);

// int g = random.nextInt(256);
// int b = random.nextInt(256);

        TextView textView = new TextView(this);
        textView.setLayoutParams(params);
        int color = Color.rgb(r, r,r+j);//此处不安全数组会越界
        textView.setBackgroundColor(color);
        layout.addView(textView);

    }
    setContentView(layout);

}

}

“` 这里写图片描述