效果：

一般寫法，使用shape：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <stroke
        android:width="1dp"
        android:color="@color/google_lightYellow"></stroke>

    <corners android:radius="5dp"></corners>
 


</shape>

靈活寫法：

1. 在attrs.xml中自定義屬性

 <declare-styleable name="CustomShapeTextView">
        <attr name="default_ring_width" format="dimension" />
        <attr name="default_ring_color" format="color" />
        <attr name="default_ring_angle" format="dimension" />
    </declare-styleable
 
>

1. 自定義TextView
   private static final int DEFAULT_COLOR = R.color.google_lightGreen;
   private static final int DEFAULT_RING_W = 2;
   private static final int DEFAULT_RING_ANGLE = 5;
   //邊線顏色
   private int mRingColor = DEFAULT_COLOR;
   //邊線寬度
   private int mRingWidth = DEFAULT_RING_W;
   //邊線圓角
   private int mRingAngle = DEFAULT_RING_ANGLE;

   private Paint mPaint;

   public CustomShapeTextView(Context context) {
   super(context);
   init();
   }

   public CustomShapeTextView(Context context, @Nullable AttributeSet attrs) {
   this(context, attrs, 0);
   }

   public CustomShapeTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
   super(context, attrs, defStyleAttr);
   TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomShapeTextView, defStyleAttr, 0);
   mRingColor = a.getColor(R.styleable.CustomShapeTextView_default_ring_color, getResources().getColor(DEFAULT_COLOR));
   mRingWidth = (int) a.getDimension(R.styleable.CustomShapeTextView_default_ring_width, DEFAULT_RING_W);
   mRingAngle = (int) a.getDimension(R.styleable.CustomShapeTextView_default_ring_angle, DEFAULT_RING_ANGLE);
   a.recycle();
   init();
   }

   private void init() {
   GradientDrawable drawable = new GradientDrawable();
   drawable.setCornerRadius(mRingAngle);
   drawable.setStroke(mRingWidth, mRingColor);
   setBackground(drawable);
   }
   “`

2. 使用
   
   
   可以再擴充套件。