颜色渐变滚动Textview

public class FlashTextView extends android.support.v7.widget.AppCompatTextView {      private Paint mPaint;      private int mViewWidth;      private LinearGradient mLinearGradient;      private Matrix mGradientMatrix;      private int mTransalte;        public FlashTextView(Context context, @Nullable AttributeSet attrs) {          super(context, attrs);      }        @Override      protected void onSizeChanged(int w, int h, int oldw, int oldh) {          super.onSizeChanged(w, h, oldw, oldh);          if (mViewWidth == 0) {              mViewWidth = getMeasuredWidth();              if (mViewWidth > 0) {                  mPaint = getPaint();//获得当前绘制的Paint对象                  mLinearGradient = new LinearGradient(                          0,//渐变起始点x坐标                          0,//渐变起始点y坐标                          mViewWidth,//渐变结束点x点坐标                          0,//渐变结束点y坐标                          new int[]{                                  Color.BLUE, 0xffffffff,                                  Color.BLUE,Color.RED,Color.YELLOW},//颜色的int数组                          null,//相对位置的颜色数组,可为null,  若为null,可为null,颜色沿渐变线均匀分布                          Shader.TileMode.MIRROR);//平铺模式                  mPaint.setShader(mLinearGradient);//给这个paint设置linearFradient属性                  mGradientMatrix = new Matrix();              }          }      }        @Override      protected void onDraw(Canvas canvas) {          super.onDraw(canvas);            if (mGradientMatrix != null) {              mTransalte += mViewWidth / 5;              if (mTransalte > 2 * mViewWidth) {                  mTransalte -= mViewWidth;              }              mGradientMatrix.setTranslate(mTransalte, 0);              mLinearGradient.setLocalMatrix(mGradientMatrix);//通过矩阵的方式不断平移产生渐变效果              postInvalidateDelayed(100);            }        }  }  

原文链接：http://blog.csdn.net/qq_29703975/article/details/66973941