Android中实现多彩的霓虹灯

Posted 2020-08-24 晨小主

1、布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mainll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.lixc.neonlight.MainActivity"
    android:orientation="vertical">

</LinearLayout>

2、color.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="color1">#ffff0000</color>
    <color name="color2">#ffff6600</color>
    <color name="color3">#ffffff00</color>
    <color name="color4">#ff00ff00</color>
    <color name="color5">#ff00ffff</color>
    <color name="color6">#ff0000ff</color>
    <color name="color7">#ff6600ff</color>
</resources>

3、在MainActivity中声明成员变量

private Handler handler;
private static LinearLayout linearLayout;
public static TextView[] textViews = new TextView[14];
int[] bgColor = new int[]{R.color.color1, R.color.color2, R.color.color3,
                 R.color.color4, R.color.color5, R.color.color6, R.color.color7};
private int index = 0;

4、在MainActivity中的onCreate()方法中，添加文本框组件到线性布局管理器中

linearLayout = (LinearLayout)findViewById(R.id.mainll);
int height = this.getResources().getDisplayMetrics().heightPixels;
for (int i=0;i<textViews.length;i++){
    textViews[i] = new TextView(this);
    textViews[i].setWidth(this.getResources().getDisplayMetrics().widthPixels);
    textViews[i].setHeight(height/textViews.length);
    linearLayout.addView(textViews[i]);
}

5、创建新线程，重写run()方法

new Thread(new Runnable() {
    @Override
    public void run() {
        while (!Thread.currentThread().isInterrupted()){
            Message message = new Message();
            message.what = 1;
            handler.sendMessage(message);
            try {
                Thread.sleep(new Random().nextInt(1000));
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }
}).start();

6、创建一个Handler对象，重写handleMessage()方法

handler = new Handler(){
    @Override
    public void handleMessage(Message msg){
        int temp = 0;
        switch (msg.what){
            case 1:
                for (int i=0;i<textViews.length;i++){
                    temp = new Random().nextInt(bgColor.length);
                    if (index == temp){
                        temp++;
                        if (temp == bgColor.length){
                            temp = 0;
                        }
                    }
                    index = temp;
                    textViews[i].setBackgroundColor(getResources().getColor(bgColor[index]));
                }
                break;
            default:
                break;
        }
        super.handleMessage(msg);
    }
};

7、实现效果

这里只是一张图片，实际上是一闪一闪的效果。