自定义TextView 灵活使用Shape实现边框

效果：

一般写法，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>

灵活写法：

1. 在attrs.xml中自定义属性

 <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. 自定义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;
   //边线颜色
   private int mRingColor = DEFAULT_COLOR;
   //边线宽度
   private int mRingWidth = DEFAULT_RING_W;
   //边线圆角
   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
   
   
   可以再扩展。