TextView 文字描边

痛定思痛。 2022-08-18 10:53 217阅读 0赞

在不是很明显的描边 可以使用 阴影来互动如下：

android:shadowColor 阴影颜色

android:shadowDx 阴影的水平偏移量

android:shadowDy 阴影的垂直偏移量

android:shadowRadius 阴影的范围

真正的描边方法如下：

实现方法是两个TextView叠加,只有描边的TextView为底,实体TextView叠加在上面

public class MyTextView2 extends TextView {
    
        private TextView borderText = null;///用于描边的TextView
    
        public MyTextView2(Context context) {
            super(context);
            borderText = new TextView(context);
            init();
        }
    
        public MyTextView2(Context context, AttributeSet attrs) {
            super(context, attrs);
            borderText = new TextView(context, attrs);
            init();
        }
    
        public MyTextView2(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            borderText = new TextView(context, attrs, defStyleAttr);
            init();
        }
    
        public void init() {
            TextPaint tp1 = borderText.getPaint();
            tp1.setStrokeWidth(1); //设置描边宽度
            tp1.setStyle(Paint.Style.STROKE); //对文字只描边
            borderText.setTextColor(Color.GREEN); //设置描边颜色
            borderText.setGravity(getGravity());
        }
    
        @Override
        public void setLayoutParams(ViewGroup.LayoutParams params) {
            super.setLayoutParams(params);
            borderText.setLayoutParams(params);
        }
    
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            CharSequence tt = borderText.getText();
    
            //两个TextView上的文字必须一致
            if (tt == null || !tt.equals(this.getText())) {
                borderText.setText(getText());
                this.postInvalidate();
            }
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
            borderText.measure(widthMeasureSpec, heightMeasureSpec);
        }
    
        protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
            super.onLayout(changed, left, top, right, bottom);
            borderText.layout(left, top, right, bottom);
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
            borderText.draw(canvas);
            super.onDraw(canvas);
        }
    }

产考:

[http://www.oschina.net/code/snippet\_586849\_37287][http_www.oschina.net_code_snippet_586849_37287]

[http_www.oschina.net_code_snippet_586849_37287]: http://www.oschina.net/code/snippet_586849_37287