GradientShaderTextView.java 文件源码

@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) {
            Paint paint = getPaint();
            String text = getText().toString();
            mTextWidth = paint.measureText(text);
            int size = (int)paint.measureText(text);
            int startX = (mViewWidth - size) / 2;
            mLinearGradient = new LinearGradient(startX + 1, 0, 0, 0,
                    new int[] { 0x90ffffff, 0xffffffff, 0x90ffffff },
                    new float[] { 0, 0.5f, 1 }, Shader.TileMode.CLAMP); //边缘融合
            paint.setShader(mLinearGradient);
            mGradientMatrix = new Matrix();
        }
    }
}