AndroidUI设计系列之自定义TextView属性实现带下划线的文本框（4）

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public class BorderTextView extends TextView { 
 
 /** 
 * 四周是否带有边框【true:四周带有边框】【false:四周不带边框】 
 */ 
 boolean borders = false; 
 /** 
 * 左边是否带有边框【true:左侧带有边框】【false:左侧不带边框】 
 */ 
 boolean borderLeft = false; 
 /** 
 * 顶部是否带有边框【true:顶部带有边框】【false:底部不带边框】 
 */ 
 boolean borderTop = false; 
 /** 
 * 右侧是否带有边框【true:右侧带有边框】【false:右侧不带边框】 
 */ 
 boolean borderRight = false; 
 /** 
 * 底部是否带有边框【true:底部带有边框】【false:底部不带边框】 
 */ 
 boolean borderBottom = false; 
 /** 
 * 边框颜色 
 */ 
 String textColor = "#ff000000"; 
 
 public BorderTextView(Context context) { 
 this(context, null); 
 } 
 
 public BorderTextView(Context context, AttributeSet attrs) { 
 this(context, attrs, android.R.attr.textViewStyle); 
 } 
 
 public BorderTextView(Context context, AttributeSet attrs, int defStyle) { 
 super(context, attrs, defStyle); 
 // 获取自定义属性集 
 TypedArray typedArray = context.obtainStyledAttributes(attrs, 
  R.styleable.BorderTextView); 
 // 是否设置全部边框，默认为false 
 borders = typedArray.getBoolean( 
  R.styleable.BorderTextView_layout_borders, false); 
 // 是否设置左侧边框，默认为false 
 borderLeft = typedArray.getBoolean( 
  R.styleable.BorderTextView_layout_borderLeft, false); 
 // 是否设置顶部边框，默认为false 
 borderTop = typedArray.getBoolean( 
  R.styleable.BorderTextView_layout_borderTop, false); 
 // 是否设置右侧边框，默认为false 
 borderRight = typedArray.getBoolean( 
  R.styleable.BorderTextView_layout_borderRight, false); 
 // 是否设置底部边框，默认为false 
 borderBottom = typedArray.getBoolean( 
  R.styleable.BorderTextView_layout_borderBottom, false); 
 // 获取文本颜色值，用来画边框的，便于和文本颜色匹配 
 textColor = attrs.getAttributeValue( 
  "http://schemas.android.com/apk/res/android", "textColor"); 
 typedArray.recycle(); 
 } 
 
 @Override 
 public void draw(Canvas canvas) { 
 super.draw(canvas); 
 // 创建画笔 
 Paint paint = new Paint(); 
 // 获取该画笔颜色 
 int color = paint.getColor(); 
 // 设置画笔颜色 
 paint.setColor(Color.parseColor(textColor)); 
 // 如果borders为true，表示左上右下都有边框 
 if (borders) { 
  canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint); 
  canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint); 
  canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, 
   this.getHeight() - 1, paint); 
  canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1, 
   this.getHeight() - 1, paint); 
 } else { 
  if (borderLeft) { 
  // 画左边框线 
  canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint); 
  } 
  if (borderTop) { 
  // 画顶部边框线 
  canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint); 
  } 
  if (borderRight) { 
  // 画右侧边框线 
  canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, 
   this.getHeight() - 1, paint); 
  } 
  if (borderBottom) { 
  // 画底部边框线 
  canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1, 
   this.getHeight() - 1, paint); 
  } 
 } 
 // 设置画笔颜色归位 
 paint.setColor(color); 
 } 
}