在Android中实现黑客帝国风格的数字雨效果

// 文字的颜色值
final int DEFAULT_TEXT_COLOR = Color.argb(255, 0, 255, 70);
// 文字大小
final int TEXT_SIZE = 24;
// 普通画笔
Paint mPaint;
// 高亮画笔
Paint mPaintLight;
// 文字切换的时间间隔
int switchInterval = intervals[random.nextInt(intervals.length)];
// 数字下落的速度
int speed;

// 构建0和1的字符串
if (cOntentArray== null) {
cOntentArray= new String[]{"0", "1"};
}

private String getRandomCharacter() {
return contentArray[random.nextInt(contentArray.length)];
}

public DigitalRainView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initialize();
}

private void initialize() {
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(DEFAULT_TEXT_COLOR);
mPaint.setTextSize(TEXT_SIZE);
mPaintLight = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaintLight.setColor(Color.argb(255, 140, 255, 170));
mPaintLight.setTextSize(TEXT_SIZE);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(widthSize, heightSize);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawRain(canvas);
}

private void drawRain(Canvas canvas) {
for (Symbol[] stream : streams) {
for (Symbol symbol : stream) {
symbol.updatePosition(mHeight);
canvas.drawText(symbol.character, symbol.x, symbol.y, symbol.paint);
}
}
}