Android--view自定义--彩虹桥<跑马灯>

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="rainbow">
<attr name="rainbow_hspace" format="dimension"></attr>
<attr name="rainbow_wspace" format="dimension"></attr>
<attr name="rainbow_color" format="color"></attr>
</declare-styleable>
</resources>

package com.tool.keyproject;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

public class KeyView extends View {
int barColor = Color.parseColor("#1E88E5");
int hSpace = 50;
int vSpace = 100;
int space = 20;
float delta = 10f;

private Paint paint;

float startX = 0;

public KeyView(Context context) {
super(context);
}

public KeyView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}

public KeyView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.rainbow, 0, 0);
hSpace = typedArray.getDimensionPixelSize(R.styleable.rainbow_rainbow_hspace, hSpace);
vSpace = typedArray.getDimensionPixelOffset(R.styleable.rainbow_rainbow_wspace, vSpace);
barColor = typedArray.getColor(R.styleable.rainbow_rainbow_color, barColor);

paint = new Paint();
paint.setColor(barColor);
paint.setAntiAlias(true);
paint.setStrokeWidth(space);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float sw = this.getMeasuredWidth();
if (startX >= sw + (hSpace + space) - (sw % (hSpace + space))) {
startX = 0;
} else {
startX += delta;
}
float start = startX;

while (start < sw) {
canvas.drawLine(start, 5, start + hSpace, 5, paint);
start += (hSpace + space);
}
start = startX - space - hSpace;

while (start >= -hSpace) {
canvas.drawLine(start, 5, start + hSpace, 5, paint);
start -= (hSpace + space);
}
invalidate();
}
}

<com.tool.keyproject.KeyView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:rainbow_color="@android:color/holo_blue_bright"
app:rainbow_hspace="80dp"
app:rainbow_wspace="10dp"
></com.tool.keyproject.KeyView>