DIY flashing text effects TextView

1. Write a class that inherits View
2. onDraw override method and the method onSizeChanged
3. code is as follows:

    private Paint paint1;
    private Paint mPaint;

    private int mViewWidth;
    private LinearGradient mlinearGradient;

    private int mTranslate;//水平方向上平移的距离
    private Matrix gradientMatrix;

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

        if (gradientMatrix != null) {
            mTranslate += mViewWidth / 5;
            //每次刷新view平移一点，如果到头就重新返回在开始平移
            if (mTranslate >2*mViewWidth){
                mTranslate = -mViewWidth;
            }

            gradientMatrix.setTranslate(mTranslate,0);
            mlinearGradient.setLocalMatrix(gradientMatrix);
            postInvalidateDelayed(100);
        }

    }

    @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();
                mlinearGradient = new LinearGradient(0
                        , 0
                        , mViewWidth
                        , 0
                        , new int[]{Color.BLUE,0xffffffff,Color.BLUE}
                        , null
                        , Shader.TileMode.CLAMP);
            }

            mPaint.setShader(mlinearGradient);
            gradientMatrix = new Matrix();
        }
    }

    public void initPaint(){
        paint1 = new Paint();
        paint1.setColor(Color.BLUE);
        paint1.setStyle(Paint.Style.FILL);
    }

The key point is to use getPaint () method to get Paint target current draw of TextView, and to the paint object setting LinearGradient properties, in onDraw method, by a matrix manner to continuously translate gradient, so as to draw the text is to produce dynamic effect . . Some of which I do not often use class, first down, write a program with this kind of thing more than a few times on the familiar.
Then directly written into the xml inside when in use on the line:

<com.demo.alldemos.diyviews.MyTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

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