仿今天头条加载环境文字闪动效果

Shader.TileMode.CLAMP   重复最后一个颜色至最后  
Shader.TileMode.MIRROR  重复着色的图像水平或垂直方向已镜像方式填充会有翻转效果  
Shader.TileMode.REPEAT  重复着色的图像水平或垂直方向  

  private void init() {
        Paint mPaint = getPaint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setTextSize(40);
        gradient = new LinearGradient(0, 0, getMeasuredWidth(), 0, Color.GRAY, Color.RED, Shader.TileMode.REPEAT);
        mPaint.setShader(gradient);
        matrix = new Matrix();
    }

 if (matrix != null) {
            mTranslate += getMeasuredWidth() / 10;
            if (mTranslate > getMeasuredWidth() * 2) {
                mTranslate = -getMeasuredWidth();
            }
            matrix.setTranslate(mTranslate, 0);
            gradient.setLocalMatrix(matrix);
            postInvalidateDelayed(300);
        }