曾经做过一个项目，其中登录界面的交互令人印象深刻。交互设计师给出了一个非常作的设计，要求做出包含根据情况可变色的下划线，左侧有可变图标，右侧有可变删除标志的输入框，如图
记录制作过程：
第一版本
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public class lineedittext extends edittext {
private paint mpaint;
private int color;
public static final int status_focused = 1;
public static final int status_unfocused = 2;
public static final int status_error = 3;
private int status = 2;
private drawable del_btn;
private drawable del_btn_down;
private int focuseddrawableid = r.drawable.user_select;// 默认的
private int unfocuseddrawableid = r.drawable.user;
private int errordrawableid = r.drawable.user_error;
drawable left = null;
private context mcontext;
public lineedittext(context context) {
super(context);
mcontext = context;
init();
}
public lineedittext(context context, attributeset attrs) {
super(context, attrs);
mcontext = context;
init();
}
public lineedittext(context context, attributeset attrs, int defstryle) {
super(context, attrs, defstryle);
mcontext = context;
typedarray a = context.obtainstyledattributes(attrs,
r.styleable.lineedittext, defstryle, 0);
focuseddrawableid = a.getresourceid(
r.styleable.lineedittext_drawablefocus, r.drawable.user_select);
unfocuseddrawableid = a.getresourceid(
r.styleable.lineedittext_drawableunfocus, r.drawable.user);
errordrawableid = a.getresourceid(
r.styleable.lineedittext_drawableerror, r.drawable.user_error);
a.recycle();
init();
}
/** * 2014/7/31 * * @author aimee.zhang */
private void init() {
mpaint = new paint();
// mpaint.setstyle(paint.style.fill);
mpaint.setstrokewidth(3.0f);
color = color.parsecolor("#bfbfbf");
setstatus(status);
del_btn = mcontext.getresources().getdrawable(r.drawable.del_but_bg);
del_btn_down = mcontext.getresources().getdrawable(r.drawable.del_but_bg_down);
addtextchangedlistener(new textwatcher() {
@override
public void ontextchanged(charsequence arg0, int arg1, int arg2,
int arg3) {
}
@override
public void beforetextchanged(charsequence arg0, int arg1,
int arg2, int arg3) {
}
@override
public void aftertextchanged(editable arg0) {
setdrawable();
}
});
setdrawable();
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
mpaint.setcolor(color);
canvas.drawline(0, this.getheight() - 1, this.getwidth(),
this.getheight() - 1, mpaint);
}
// 删除图片
private void setdrawable() {
if (length() < 1) {
setcompounddrawableswithintrinsicbounds(left, null, del_btn, null);
} else {
setcompounddrawableswithintrinsicbounds(left, null, del_btn_down,null);
}
}
// 处理删除事件
@override
public boolean ontouchevent(motionevent event) {
if (del_btn_down != null && event.getaction() == motionevent.action_up) {
int eventx = (int) event.getrawx();
int eventy = (int) event.getrawy();
log.e("eventxy", "eventx = " + eventx + "; eventy = " + eventy);
rect rect = new rect();
getglobalvisiblerect(rect);
rect.left = rect.right - 50;
if (rect.contains(eventx, eventy))
settext("");
}
return super.ontouchevent(event);
}
public void setstatus(int status) {
this.status = status;
if (status == status_error) {
try {
left = getresources().getdrawable(errordrawableid);
} catch (notfoundexception e) {
e.printstacktrace();
}
setcolor(color.parsecolor("#f57272"));
} else if (status == status_focused) {
try {
left = getresources().getdrawable(focuseddrawableid);
} catch (notfoundexception e) {
e.printstacktrace();
}
setcolor(color.parsecolor("#5e99f3"));
} else {
try {
left = getresources().getdrawable(unfocuseddrawableid);
} catch (notfoundexception e) {
e.printstacktrace();
}
setcolor(color.parsecolor("#bfbfbf"));
}
if (left != null) {
// left.setbounds(0, 0, 30, 40);
// this.setcompounddrawables(left, null, null, null);
setcompounddrawableswithintrinsicbounds(left,null,del_btn,null);
}
postinvalidate();
}
public void setleftdrawable(int focuseddrawableid, int unfocuseddrawableid,
int errordrawableid) {
this.focuseddrawableid = focuseddrawableid;
this.unfocuseddrawableid = unfocuseddrawableid;
this.errordrawableid = errordrawableid;
setstatus(status);
}
@override
protected void onfocuschanged(boolean focused, int direction,
rect previouslyfocusedrect) {
super.onfocuschanged(focused, direction, previouslyfocusedrect);
if (focused) {
setstatus(status_focused);
} else {
setstatus(status_unfocused);
}
}
@override
protected void finalize() throws throwable {
super.finalize();
};
public void setcolor(int color) {
this.color = color;
this.settextcolor(color);
invalidate();
}
}
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效果图：
代码解释：
变量名 status_focused,status_unfocused,status_error 标示了三种状态，选中状况为蓝色，未选中状态为灰色，错误状态为红色。 focuseddrawableid unfocuseddrawableid errordrawableid 存放三种状态的图片，放置于最左侧。
canvas.drawline(0, this.getheight() - 1, this.getwidth(),this.getheight() - 1, mpaint); //画edittext 最下方的线 setcompounddrawableswithintrinsicbounds(left, null, del_btn, null); //放置左边的和右边的图片（左，上，右，下） 相当于 android:drawableleft="" android:drawableright=""
1、ontouchevent 当手机点击时，第一个先执行的函数，当点击右侧删除图标是清空 edittext
2、setstatus 根据不同的状态，左边的图片不一样
存在的问题： 这版本虽然基本功能已经实现，但是不符合需求，设计中要求文本框中无文字时，右侧删除按钮不显示，不点击删除按钮，删除按钮要保持灰色，点击时才可以变蓝色。
因此有了第二个版本
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public class lineedittext extends edittext implements textwatcher, <br /> onfocuschangelistener{
private paint mpaint;
private int color;
public static final int status_focused = 1;
public static final int status_unfocused = 2;
public static final int status_error = 3;
private int status = 2;
private drawable del_btn;
private drawable del_btn_down;
private int focuseddrawableid = r.drawable.user_select;// 默认的
private int unfocuseddrawableid = r.drawable.user;
private int errordrawableid = r.drawable.user_error;
drawable left = null;
private context mcontext;
/**
* 是否获取焦点，默认没有焦点
*/
private boolean hasfocus = false;
/**
* 手指抬起时的x坐标
*/
private int xup = 0;
public lineedittext(context context) {
super(context);
mcontext = context;
init();
}
public lineedittext(context context, attributeset attrs) {
super(context, attrs);
mcontext = context;
init();
}
public lineedittext(context context, attributeset attrs, int defstryle) {
super(context, attrs, defstryle);
mcontext = context;
typedarray a = context.obtainstyledattributes(attrs,
r.styleable.lineedittext, defstryle, 0);
focuseddrawableid = a.getresourceid(
r.styleable.lineedittext_drawablefocus, r.drawable.user_select);
unfocuseddrawableid = a.getresourceid(
r.styleable.lineedittext_drawableunfocus, r.drawable.user);
errordrawableid = a.getresourceid(
r.styleable.lineedittext_drawableerror, r.drawable.user_error);
a.recycle();
init();
}
/**
* 2014/7/31
*
* @author aimee.zhang
*/
private void init() {
mpaint = new paint();
// mpaint.setstyle(paint.style.fill);
mpaint.setstrokewidth(3.0f);
color = color.parsecolor("#bfbfbf");
setstatus(status);
del_btn = mcontext.getresources().getdrawable(r.drawable.del_but_bg);
del_btn_down = mcontext.getresources().getdrawable(r.drawable.del_but_bg_down);
addlisteners();
setcompounddrawableswithintrinsicbounds(left, null, null, null);
}
@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
mpaint.setcolor(color);
canvas.drawline(0, this.getheight() - 1, this.getwidth(),
this.getheight() - 1, mpaint);
}
// 删除图片
// private void setdrawable() { // if (length() < 1) { // setcompounddrawableswithintrinsicbounds(left, null, null, null); // } else { // setcompounddrawableswithintrinsicbounds(left, null, del_btn,null); // } // }
// 处理删除事件
@override
public boolean ontouchevent(motionevent event) {
if (del_btn != null && event.getaction() == motionevent.action_up) {
// 获取点击时手指抬起的x坐标
xup = (int) event.getx();
log.e("xup", xup+"");
/*rect rect = new rect();
getglobalvisiblerect(rect);
rect.left = rect.right - 50;*/
// 当点击的坐标到当前输入框右侧的距离小于等于 getcompoundpaddingright() 的距离时，则认为是点击了删除图标
if ((getwidth() - xup) <= getcompoundpaddingright()) {
if (!textutils.isempty(gettext().tostring())) {
settext("");
}
}
}else if(del_btn != null && event.getaction() == motionevent.action_down && gettext().length()!=0){
setcompounddrawableswithintrinsicbounds(left,null,del_btn_down,null);
}else if(gettext().length()!=0){
setcompounddrawableswithintrinsicbounds(left,null,del_btn,null);
}
return super.ontouchevent(event);
}
public void setstatus(int status) {
this.status = status;
if (status == status_error) {
try {
left = getresources().getdrawable(errordrawableid);
} catch (notfoundexception e) {
e.printstacktrace();
}
setcolor(color.parsecolor("#f57272"));
} else if (status == status_focused) {
try {
left = getresources().getdrawable(focuseddrawableid);
} catch (notfoundexception e) {
e.printstacktrace();
}
setcolor(color.parsecolor("#5e99f3"));
} else {
try {
left = getresources().getdrawable(unfocuseddrawableid);
} catch (notfoundexception e) {
e.printstacktrace();
}
setcolor(color.parsecolor("#bfbfbf"));
}
if (left != null) {
// left.setbounds(0, 0, 30, 40); // this.setcompounddrawables(left, null, null, null); setcompounddrawableswithintrinsicbounds(left,null,null,null); } postinvalidate(); }
public void setleftdrawable(int focuseddrawableid, int unfocuseddrawableid,
int errordrawableid) {
this.focuseddrawableid = focuseddrawableid;
this.unfocuseddrawableid = unfocuseddrawableid;
this.errordrawableid = errordrawableid;
setstatus(status);
}
private void addlisteners() {
try {
setonfocuschangelistener(this);
addtextchangedlistener(this);
} catch (exception e) {
e.printstacktrace();
}
}
@override
protected void onfocuschanged(boolean focused, int direction,
rect previouslyfocusedrect) {
super.onfocuschanged(focused, direction, previouslyfocusedrect);
this.hasfocus=focused;
if (focused) {
setstatus(status_focused);
} else {
setstatus(status_unfocused);
setcompounddrawableswithintrinsicbounds(left,null,null,null);
}
}
@override
protected void finalize() throws throwable {
super.finalize();
};
public void setcolor(int color) {
this.color = color;
this.settextcolor(color);
invalidate();
}
@override
public void aftertextchanged(editable arg0) {
// todo auto-generated method stub
postinvalidate();
}
@override
public void beforetextchanged(charsequence arg0, int arg1, int arg2,
int arg3) {
// todo auto-generated method stub
if (textutils.isempty(arg0)) {
// 如果为空，则不显示删除图标
setcompounddrawableswithintrinsicbounds(left, null, null, null);
} else {
// 如果非空，则要显示删除图标
setcompounddrawableswithintrinsicbounds(left, null, del_btn, null);
}
}
@override
public void ontextchanged(charsequence s, int start, int before, int after) {
if (hasfocus) {
if (textutils.isempty(s)) {
// 如果为空，则不显示删除图标
setcompounddrawableswithintrinsicbounds(left, null, null, null);
} else {
// 如果非空，则要显示删除图标
setcompounddrawableswithintrinsicbounds(left, null, del_btn, null);
}
}
}
@override
public void onfocuschange(view arg0, boolean arg1) {
// todo auto-generated method stub
try {
this.hasfocus = arg1;
} catch (exception e) {
e.printstacktrace();
}
}
}
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比较关键的方法是：ontouchevent
当进入界面，点击输入框，要判断输入框中是否已有文字，如果有则显示灰色的删除按钮，如果没有则不显示，如果点击了删除按钮，删除按钮变蓝色
存在的问题： 这个版本依旧存在问题，就是输入长度超过输入框，所画的线不会延伸，如图
解决方法：
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@override
protected void ondraw(canvas canvas) {
super.ondraw(canvas);
mpaint.setcolor(color);
int x=this.getscrollx();
int w=this.getmeasuredwidth();
canvas.drawline(0, this.getheight() - 1, w+x,
this.getheight() - 1, mpaint);
}
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w：获取控件长度
x：延伸后的长度
最终效果：
以上就是android实现自定义的edittext下划线的方法，希望对大家的学习有所帮助。