TextView 文字描边

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