Android 自定义TextView实现文字和图片居中显示

2022-11-14 16:31:53 浏览数 (1)

默认情况下,如果TextView的宽度超过文字的宽度,文字居中显示时,想要在文字的左边或者右边添加一个图片时,左边或者右边的文字就会默认以左边和右边开始排列,效果如下。

如果想要让,文字和图片一起居中显示,那么需要重写onDraw()方法,涉及的代码如下:

代码语言:javascript复制
 @Override
    protected void onDraw(Canvas canvas) {
        Drawable[] drawables = getCompoundDrawables();
        if (null != drawables) {
            Drawable drawableLeft = drawables[0];
            Drawable drawableRight = drawables[2];
            float textWidth = getPaint().measureText(getText().toString());
            if (null != drawableLeft) {
                setGravity(Gravity.START | Gravity.CENTER_VERTICAL);
                float contentWidth = textWidth   getCompoundDrawablePadding()   drawableLeft.getIntrinsicWidth();
                if (getWidth() - contentWidth > 0) {
                    canvas.translate((getWidth() - contentWidth - getPaddingRight() - getPaddingLeft()) / 2, 0);
                }
            }
            if (null != drawableRight) {
                setGravity(Gravity.END | Gravity.CENTER_VERTICAL);
                float contentWidth = textWidth   getCompoundDrawablePadding()   drawableRight.getIntrinsicWidth();
                if (getWidth() - contentWidth > 0) {
                    canvas.translate(-(getWidth() - contentWidth - getPaddingRight() - getPaddingLeft()) / 2, 0);
                }
            }
            if (null == drawableRight && null == drawableLeft) {
                setGravity(Gravity.CENTER);
            }
        }

        super.onDraw(canvas);
    }

然后,再页面中引入我们自定义的TextView即可实现文字和图片的居中显示。

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