Android 太阳出来了

 

public class ShimmerTextView extends View {

    private Paint mPaint;

    /**
     * 位移的变化
     */
    private int mDx;
    private LinearGradient mLinearGradient;
    private Path path;

    public ShimmerTextView(Context context) {
        this(context, null);
    }

    public ShimmerTextView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public ShimmerTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        mPaint = new Paint();
//        mPaint.setAntiAlias(true);
//        mPaint.setDither(true);


        path = new Path();
        path.addCircle(400, 400,200 , Path.Direction.CW);

        PathMeasure mPathMeasure = new PathMeasure(path, false);
        int length = (int) mPathMeasure.getLength();

        createAnim(length);
        creatLinearGradient(length);

    }

    /**
     * 着色
     *
     * @param mLength
     */
    private void creatLinearGradient(int mLength) {

        // 需要注意的  : 开始的颜色 和结束的颜色 最好是一个颜色
        int[] colors = {0xffff0000, 0xff00ff00, 0xffffff00, 0xffffffff, 0xffff0000};
        float[] pos = {0.0f, 0.25f, 0.5f, 0.75f, 1.0f};
        mLinearGradient = new LinearGradient(-mLength, 0, 0, 0, colors, pos, Shader.TileMode.CLAMP);

    }


    /**
     * 绘制路径 文字长度 动画
     *
     * @param mLength
     */
    private void createAnim(int mLength) {
        ValueAnimator mValueAnimator = ValueAnimator.ofInt(0, mLength * 2);
        mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mDx = (int) animation.getAnimatedValue();
                postInvalidate();
            }
        });
        mValueAnimator.setRepeatMode(ValueAnimator.RESTART);
        mValueAnimator.setRepeatCount(ValueAnimator.INFINITE);
        mValueAnimator.setDuration(2000);
        mValueAnimator.start();
    }

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

        Matrix mMatrix = new Matrix();
        mMatrix.setTranslate(mDx, 0);
        mLinearGradient.setLocalMatrix(mMatrix);
        mPaint.setShader(mLinearGradient);
        canvas.drawPath(path, mPaint);

    }
}

 

本文地址：https://blog.csdn.net/FlyPig_Vip/article/details/107365354