andorid渐变色的TextView

代码

public class GradientTextView extends TextView {
    public GradientTextView(Context context) {
        super(context);
    }

    public GradientTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

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

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        TextPaint paint = getPaint();
        LinearGradient mLinearGradient = new LinearGradient(0, 0, w, 0,
                Color.RED, Color.GREEN, Shader.TileMode.CLAMP);
        paint.setShader(mLinearGradient);
    }

}

1、在onSizeChanged里面给TextPaint设置一个LinearGradient
2、在使用的时候注意TextView文字的颜色，如果文字颜色带有透明度就会使实际效果与想要的效果有偏差

效果

gradient.png