今天项目有个需求，就是在编辑栏的左边添加一张图片，但是我不是很想使用布局嵌套的方式来进行，所有我就干脆自定义了一个控件来进行显示。
效果图：
代码如下：
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.EditText;
/**
* 创建时间：2016.8.1
* 创建人：王亮
* 功能作用：带有自定义下划线的编辑框（已经添加过图片）
* 逻辑：使setGravity（）方法不向父类返回，让文字位置设置失效；使setBackground（）方法向父类返回为空，使原本下滑线消失；
* 使用onTextChanged（）方法监听文字改变并记录文字；使用setCompoundDrawables（）方法来计算向编辑框中添加图片的宽高；
* 最后重写ondraw（）方法进行重绘下滑线，并记录初始设置的文字颜色，记录之后将初始文字颜色设置为透明色，然后在计算新的文字
* 所要显示的位置的坐标，最后再将记录的文字重绘
*/
public class UnderlineEdittextView extends EditText {
private Integer leftMinimumWidth;
private Integer topMinimumHeight;
private Integer rightMinimumWidth;
private Integer bottomMinimumHeight;
private Paint linePaint;//下划线画笔
public UnderlineEdittextView(Context context) {
super(context);
init();
}
public UnderlineEdittextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public UnderlineEdittextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
/** 要显示的文字 */
private String showText;
/** 文字的颜色 */
private Integer showTextColor;
/** 文字的大小 */
private int showTextSize;
/** 文字的方位 */
private int showTextAlign;
/** 左上角显示 */
public static final int TEXT_ALIGN_LEFT_TOP = 0x00000001;
/** 左侧中间显示 */
public static final int TEXT_ALIGN_LEFT_CENTER = 0x00000010;
/** 左侧下方显示 */
public static final int TEXT_ALIGN_LEFT_BOTTOM = 0x00000100;
/** 右上角显示 */
public static final int TEXT_ALIGN_RIGHT_TOP = 0x00001000;
/** 右侧中间显示 */
public static final int TEXT_ALIGN_RIGHT_CENTER = 0x00010000;
/** 右侧下方显示 */
public static final int TEXT_ALIGN_RIGHT_BOTTOM = 0x00100000;
/** 中间顶部显示 */
public static final int TEXT_ALIGN_CENTER_HORIZONTAL_TOP = 0x00001000|0x00010000;
/** 中间下方显示 */
public static final int TEXT_ALIGN_CENTER_HORIZONTAL_BOTTOM = 0x10000010;
/** 居中显示 */
public static final int TEXT_ALIGN_CENTER = 0x10000100;
/** 居中靠上显示 */
public static final int TEXT_ALIGN_CENTER_TOP = 0x10001000;
/** 居中靠下显示 */
public static final int TEXT_ALIGN_CENTER_BOTTOM = 0x10010000;
/** 居中靠左显示 */
public static final int TEXT_ALIGN_CENTER_LEFT = 0x10100000;
/** 居中靠右显示 */
public static final int TEXT_ALIGN_CENTER_RIGHT = 0x11000000;
/** 居中靠左上显示 */
public static final int TEXT_ALIGN_CENTER_LEFT_TOP = 0x11000001;
/** 居中靠左下显示 */
public static final int TEXT_ALIGN_CENTER_LEFT_BOTTOM = 0x11000010;
/** 居中靠右上显示 */
public static final int TEXT_ALIGN_CENTER_RIGHT_TOP = 0x11000100;
/** 居中靠右下显示 */
public static final int TEXT_ALIGN_CENTER_RIGHT_BOTTOM = 0x11001000;
/** */
/** 文本中轴线X坐标 */
private Float showTextCenterX = 0f;
/** 文本baseline线Y坐标 */
private Float showTextBaselineY = 0f;
/** 控件的宽度 */
private int viewWidth;
/** 控件的高度 */
private int viewHeight;
private Paint.FontMetrics fm;
/** 场景 */
private Paint showTextPaint;
private void init(){
showTextPaint = new Paint();
showTextPaint.setTextSize(getTextSize());
linePaint = new Paint();
linePaint.setColor(Color.BLACK);
linePaint.setStrokeWidth(5);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(showTextColor == null) {
showTextColor = getTextColors().getDefaultColor();//记录初始文字颜色值
setTextColor(Color.parseColor("#00000000"));//使初始文字变透明
setCursorVisible(false);//取消光标显示
}else {
showTextPaint.setColor(showTextColor);
setTextLocation(showTextPaint);//计算文字显示位置
}
if(leftMinimumWidth != null) {
canvas.drawLine(leftMinimumWidth, getHeight(), getWidth(), getHeight(), linePaint);
canvas.drawText(showText,showTextCenterX + leftMinimumWidth / 2,showTextBaselineY,showTextPaint);
}else if(topMinimumHeight != null) {
canvas.drawLine(0, getHeight(), getWidth(), getHeight(), linePaint);
canvas.drawText(showText,showTextCenterX,showTextBaselineY + topMinimumHeight / 2,showTextPaint);
}else if(rightMinimumWidth != null) {
canvas.drawLine(0, getHeight(), getWidth() - rightMinimumWidth, getHeight(), linePaint);
canvas.drawText(showText,showTextCenterX - rightMinimumWidth / 2,showTextBaselineY,showTextPaint);
}else if(bottomMinimumHeight != null) {
canvas.drawLine(0, getHeight() - bottomMinimumHeight, getWidth(), getHeight() - bottomMinimumHeight, linePaint);
canvas.drawText(showText,showTextCenterX,showTextBaselineY - bottomMinimumHeight / 2,showTextPaint);
}else{
canvas.drawLine(0, getHeight(), getWidth(), getHeight(), linePaint);
canvas.drawText(showText,showTextCenterX,showTextBaselineY,showTextPaint);
}
}
/**
* 定位文本绘制的位置
*/
private void setTextLocation(Paint showTextPaint) {
viewHeight = getHeight();
viewWidth = getWidth();
fm = showTextPaint.getFontMetrics();
//文本的宽度
float textWidth = showTextPaint.measureText(showText);
float textHeight = fm.descent - fm.ascent;
float textCenterVerticalBaselineY = viewHeight / 2 - fm.descent + (fm.descent - fm.ascent) / 2;
switch (showTextAlign) {
case TEXT_ALIGN_CENTER://居中
default:
showTextCenterX = (float)viewWidth / 2 - textWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_LEFT_CENTER://居中靠最左
showTextCenterX = textWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_RIGHT_CENTER://居中靠最右
showTextCenterX = viewWidth - textWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_CENTER_HORIZONTAL_BOTTOM://居中靠最下
showTextCenterX = Float.valueOf(viewWidth / 2);
showTextBaselineY = viewHeight - fm.bottom;
break;
case TEXT_ALIGN_CENTER_HORIZONTAL_TOP://居中靠最上
showTextCenterX = Float.valueOf(viewWidth / 2);
showTextBaselineY = -fm.ascent;
break;
case TEXT_ALIGN_LEFT_TOP://左上
showTextCenterX = textWidth / 2;
showTextBaselineY = -fm.ascent;
break;
case TEXT_ALIGN_LEFT_BOTTOM://左下
showTextCenterX = textWidth / 2;//
showTextBaselineY = viewHeight - fm.bottom;
break;
case TEXT_ALIGN_RIGHT_TOP://右上
showTextCenterX = viewWidth - textWidth / 2;
showTextBaselineY = -fm.ascent;
break;
case TEXT_ALIGN_RIGHT_BOTTOM://右下
showTextCenterX = viewWidth - textWidth / 2;
showTextBaselineY = viewHeight - fm.bottom;
break;
case TEXT_ALIGN_CENTER_TOP://居中靠上
showTextCenterX = (float)viewWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY - textHeight / 2;
break;
case TEXT_ALIGN_CENTER_BOTTOM:/** 居中靠下显示 */
showTextCenterX = (float)viewWidth / 2;
showTextBaselineY = textCenterVerticalBaselineY + textHeight / 2;
break;
case TEXT_ALIGN_CENTER_LEFT:/** 居中靠左显示 */
showTextCenterX = (float)viewWidth / 2 - textWidth / 2 ;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_CENTER_RIGHT:/** 居中靠右显示 */
showTextCenterX = (float)viewWidth / 2 + textWidth / 2 ;
showTextBaselineY = textCenterVerticalBaselineY;
break;
case TEXT_ALIGN_CENTER_LEFT_TOP:/** 居中靠左上显示 */
showTextCenterX = (float)viewWidth / 2 - textWidth / 2 ;
showTextBaselineY = textCenterVerticalBaselineY - textHeight / 2 ;
break;
case TEXT_ALIGN_CENTER_LEFT_BOTTOM:/** 居中靠左下显示 */
showTextCenterX = (float)viewWidth / 2 - textWidth / 2 ;
showTextBaselineY = textCenterVerticalBaselineY + textHeight / 2 ;
break;
case TEXT_ALIGN_CENTER_RIGHT_TOP:/** 居中靠右上显示 */
showTextCenterX = (float)viewWidth / 2 + textWidth / 2 ;
showTextBaselineY = textCenterVerticalBaselineY - textHeight / 2 ;
break;
case TEXT_ALIGN_CENTER_RIGHT_BOTTOM:/** 居中靠右下显示 */
showTextCenterX = (float)viewWidth / 2 + textWidth / 2 ;
showTextBaselineY = textCenterVerticalBaselineY + textHeight / 2 ;
break;
}
}
public UnderlineEdittextView setShowTextAlign(int showTextAlign) {
this.showTextAlign = showTextAlign;
postInvalidate();
return this;
}
@Override
public void setCompoundDrawables(Drawable left, Drawable top, Drawable right, Drawable bottom) {
super.setCompoundDrawables(left, top, right, bottom);
if(left != null) {
leftMinimumWidth = new Integer(left.getMinimumWidth()) + getPaddingLeft();
}
if(top != null) {
topMinimumHeight = new Integer(top.getMinimumHeight()) + getPaddingTop();
}
if(right != null) {
rightMinimumWidth = new Integer(right.getMinimumWidth()) + getPaddingRight();
}
if(bottom != null) {
bottomMinimumHeight = new Integer(bottom.getMinimumHeight()) + getPaddingBottom();
}
}
@Override
public void setBackground(Drawable background) {
super.setBackground(null);
}
@Override
public void setGravity(int gravity) {
}
/**
* 重写当字符改变时候的监听
* @param text
* @param start
* @param lengthBefore
* @param lengthAfter
*/
@Override
protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
this.showText = text.toString();
postInvalidate();
invalidate();
}
}
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