Android 如何自定义EditText 下划线？

项目要求：笔者曾经做过一个项目，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

public class LineEditText extends EditText {

1private Paint mPaint;
2private int color;
3public static final int STATUS_FOCUSED = 1;
4public static final int STATUS_UNFOCUSED = 2;
5public static final int STATUS_ERROR = 3;
6private int status = 2;
7private Drawable del_btn;
8private Drawable del_btn_down;
9private int focusedDrawableId = R.drawable.user_select;// 默认的
10private int unfocusedDrawableId = R.drawable.user;
11private int errorDrawableId = R.drawable.user_error;
12Drawable left = null;
13private Context mContext;

public LineEditText(Context context) {

1	super(context);
2	mContext = context;
3	init();
4}

public LineEditText(Context context, AttributeSet attrs) {

1	super(context, attrs);
2	mContext = context;
3	init();
4
5}

public LineEditText(Context context, AttributeSet attrs, int defStryle) {

1	super(context, attrs, defStryle);
2	mContext = context;
3	TypedArray a = context.obtainStyledAttributes(attrs,
4			R.styleable.lineEdittext, defStryle, 0);
5	focusedDrawableId = a.getResourceId(
6			R.styleable.lineEdittext_drawableFocus, R.drawable.user_select);
7	unfocusedDrawableId = a.getResourceId(
8			R.styleable.lineEdittext_drawableUnFocus, R.drawable.user);
9	errorDrawableId = a.getResourceId(
10			R.styleable.lineEdittext_drawableError, R.drawable.user_error);
11	a.recycle();
12	init();
13}

/** * 2014/7/31 * * @author Aimee.ZHANG */

1private void init() {
2	mPaint = new Paint();
3	// mPaint.setStyle(Paint.Style.FILL);
4	mPaint.setStrokeWidth(3.0f);
5	color = Color.parseColor("#bfbfbf");
6	setStatus(status);
7	del_btn = mContext.getResources().getDrawable(R.drawable.del_but_bg);
8	del_btn_down = mContext.getResources().getDrawable(R.drawable.del_but_bg_down);
9	addTextChangedListener(new TextWatcher() {
10
11		@Override
12		public void onTextChanged(CharSequence arg0, int arg1, int arg2,
13				int arg3) {
14		}
15
16		@Override
17		public void beforeTextChanged(CharSequence arg0, int arg1,
18				int arg2, int arg3) {
19		}
20
21		@Override
22		public void afterTextChanged(Editable arg0) {
23			setDrawable();
24		}
25	});
26	setDrawable();
27}
28
29@Override
30protected void onDraw(Canvas canvas) {
31	super.onDraw(canvas);
32	mPaint.setColor(color);
33	canvas.drawLine(0, this.getHeight() - 1, this.getWidth(),
34			this.getHeight() - 1, mPaint);
35}
36
37// 删除图片
38private void setDrawable() {
39	if (length() < 1) {
40		setCompoundDrawablesWithIntrinsicBounds(left, null, del_btn, null);
41	} else {
42		setCompoundDrawablesWithIntrinsicBounds(left, null, del_btn_down,null);
43	}
44}
45
46// 处理删除事件
47@Override
48public boolean onTouchEvent(MotionEvent event) {
49	if (del_btn_down != null && event.getAction() == MotionEvent.ACTION_UP) {
50		int eventX = (int) event.getRawX();
51		int eventY = (int) event.getRawY();
52		Log.e("eventXY", "eventX = " + eventX + "; eventY = " + eventY);  
53		Rect rect = new Rect();
54		getGlobalVisibleRect(rect);
55		rect.left = rect.right - 50;
56		if (rect.contains(eventX, eventY))
57		setText("");
58	}
59	return super.onTouchEvent(event);
60}
61
62public void setStatus(int status) {
63	this.status = status;
64	
65
66	if (status == STATUS_ERROR) {
67		try {
68			left = getResources().getDrawable(errorDrawableId);
69		} catch (NotFoundException e) {
70			e.printStackTrace();
71		}
72		setColor(Color.parseColor("#f57272"));
73	} else if (status == STATUS_FOCUSED) {
74		try {
75			left = getResources().getDrawable(focusedDrawableId);
76		} catch (NotFoundException e) {
77			e.printStackTrace();
78		}
79		setColor(Color.parseColor("#5e99f3"));
80	} else {
81		try {
82			left = getResources().getDrawable(unfocusedDrawableId);
83		} catch (NotFoundException e) {
84			e.printStackTrace();
85		}
86		setColor(Color.parseColor("#bfbfbf"));
87	}
88	if (left != null) {

// left.setBounds(0, 0, 30, 40);

// this.setCompoundDrawables(left, null, null, null);

1		setCompoundDrawablesWithIntrinsicBounds(left,null,del_btn,null);
2	}
3	postInvalidate();
4}
5
6public void setLeftDrawable(int focusedDrawableId, int unfocusedDrawableId,
7		int errorDrawableId) {
8	this.focusedDrawableId = focusedDrawableId;
9	this.unfocusedDrawableId = unfocusedDrawableId;
10	this.errorDrawableId = errorDrawableId;
11	setStatus(status);
12}
13
14@Override
15protected void onFocusChanged(boolean focused, int direction,
16		Rect previouslyFocusedRect) {
17	super.onFocusChanged(focused, direction, previouslyFocusedRect);
18	if (focused) {
19		setStatus(STATUS_FOCUSED);
20	} else {
21		setStatus(STATUS_UNFOCUSED);
22	}
23}
24
25@Override
26protected void finalize() throws Throwable {
27	super.finalize();
28};
29
30public void setColor(int color) {
31	this.color = color;
32	this.setTextColor(color);
33	invalidate();
34}

}

效果图： Android 如何自定义EditText 下划线？

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=""

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
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

public class LineEditText extends EditText implements TextWatcher, OnFocusChangeListener{

1private Paint mPaint;
2private int color;
3public static final int STATUS_FOCUSED = 1;
4public static final int STATUS_UNFOCUSED = 2;
5public static final int STATUS_ERROR = 3;
6private int status = 2;
7private Drawable del_btn;
8private Drawable del_btn_down;
9private int focusedDrawableId = R.drawable.user_select;// 默认的
10private int unfocusedDrawableId = R.drawable.user;
11private int errorDrawableId = R.drawable.user_error;
12Drawable left = null;
13private Context mContext;
14/** 
15 * 是否获取焦点，默认没有焦点 
16 */  
17private boolean hasFocus = false;  
18/** 
19 * 手指抬起时的X坐标 
20 */  
21private int xUp = 0;  
22
23public LineEditText(Context context) {
24	super(context);
25	mContext = context;
26	init();
27}
28
29public LineEditText(Context context, AttributeSet attrs) {
30	super(context, attrs);
31	mContext = context;
32	init();
33
34}
35
36public LineEditText(Context context, AttributeSet attrs, int defStryle) {
37	super(context, attrs, defStryle);
38	mContext = context;
39	TypedArray a = context.obtainStyledAttributes(attrs,
40			R.styleable.lineEdittext, defStryle, 0);
41	focusedDrawableId = a.getResourceId(
42			R.styleable.lineEdittext_drawableFocus, R.drawable.user_select);
43	unfocusedDrawableId = a.getResourceId(
44			R.styleable.lineEdittext_drawableUnFocus, R.drawable.user);
45	errorDrawableId = a.getResourceId(
46			R.styleable.lineEdittext_drawableError, R.drawable.user_error);
47	a.recycle();
48	init();
49}
50
51/**
52 * 2014/7/31
53 * 
54 * @author Aimee.ZHANG
55 */
56private void init() {
57	mPaint = new Paint();
58	// mPaint.setStyle(Paint.Style.FILL);
59	mPaint.setStrokeWidth(3.0f);
60	color = Color.parseColor("#bfbfbf");
61	setStatus(status);
62	del_btn = mContext.getResources().getDrawable(R.drawable.del_but_bg);
63	del_btn_down = mContext.getResources().getDrawable(R.drawable.del_but_bg_down);
64	addListeners();
65	setCompoundDrawablesWithIntrinsicBounds(left, null, null, null);
66}
67
68@Override
69protected void onDraw(Canvas canvas) {
70	super.onDraw(canvas);
71	mPaint.setColor(color);
72	canvas.drawLine(0, this.getHeight() - 1, this.getWidth(),
73			this.getHeight() - 1, mPaint);
74}
75
76// 删除图片

// private void setDrawable() { // if (length() < 1) { // setCompoundDrawablesWithIntrinsicBounds(left, null, null, null); // } else { // setCompoundDrawablesWithIntrinsicBounds(left, null, del_btn,null); // } // }

1// 处理删除事件
2@Override
3public boolean onTouchEvent(MotionEvent event) {
4	if (del_btn != null && event.getAction() == MotionEvent.ACTION_UP) {
5		// 获取点击时手指抬起的X坐标  
6        xUp = (int) event.getX();  
7		Log.e("xUp", xUp+"");  
8		/*Rect rect = new Rect();
9		getGlobalVisibleRect(rect);
10		rect.left = rect.right - 50;*/
11		  // 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  
12		if ((getWidth() - xUp) <= getCompoundPaddingRight()) {  
13            if (!TextUtils.isEmpty(getText().toString())) {
14                setText("");  
15            }  
16		}
17	}else if(del_btn != null && event.getAction() == MotionEvent.ACTION_DOWN && getText().length()!=0){
18		setCompoundDrawablesWithIntrinsicBounds(left,null,del_btn_down,null);
19	}else if(getText().length()!=0){
20		setCompoundDrawablesWithIntrinsicBounds(left,null,del_btn,null);
21	}
22	return super.onTouchEvent(event);
23}
24
25public void setStatus(int status) {
26	this.status = status;
27	
28
29	if (status == STATUS_ERROR) {
30		try {
31			left = getResources().getDrawable(errorDrawableId);
32		} catch (NotFoundException e) {
33			e.printStackTrace();
34		}
35		setColor(Color.parseColor("#f57272"));
36	} else if (status == STATUS_FOCUSED) {
37		try {
38			left = getResources().getDrawable(focusedDrawableId);
39		} catch (NotFoundException e) {
40			e.printStackTrace();
41		}
42		setColor(Color.parseColor("#5e99f3"));
43	} else {
44		try {
45			left = getResources().getDrawable(unfocusedDrawableId);
46		} catch (NotFoundException e) {
47			e.printStackTrace();
48		}
49		setColor(Color.parseColor("#bfbfbf"));
50	}
51	if (left != null) {

// left.setBounds(0, 0, 30, 40); // this.setCompoundDrawables(left, null, null, null); setCompoundDrawablesWithIntrinsicBounds(left,null,null,null); } postInvalidate(); }

1public void setLeftDrawable(int focusedDrawableId, int unfocusedDrawableId,
2		int errorDrawableId) {
3	this.focusedDrawableId = focusedDrawableId;
4	this.unfocusedDrawableId = unfocusedDrawableId;
5	this.errorDrawableId = errorDrawableId;
6	setStatus(status);
7}
8 private void addListeners() {  
9        try {  
10            setOnFocusChangeListener(this);  
11            addTextChangedListener(this);  
12        } catch (Exception e) {  
13            e.printStackTrace();  
14        }  
15    }  
16@Override
17protected void onFocusChanged(boolean focused, int direction,
18		Rect previouslyFocusedRect) {
19	super.onFocusChanged(focused, direction, previouslyFocusedRect);
20	this.hasFocus=focused;
21	if (focused) {
22		setStatus(STATUS_FOCUSED);
23	} else {
24		setStatus(STATUS_UNFOCUSED);
25		setCompoundDrawablesWithIntrinsicBounds(left,null,null,null);
26	}
27}
28
29@Override
30protected void finalize() throws Throwable {
31	super.finalize();
32};
33
34public void setColor(int color) {
35	this.color = color;
36	this.setTextColor(color);
37	invalidate();
38}
39
40
41
42@Override
43public void afterTextChanged(Editable arg0) {
44	// TODO Auto-generated method stub
45	postInvalidate();
46}
47
48@Override
49public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
50		int arg3) {
51	// TODO Auto-generated method stub
52	 if (TextUtils.isEmpty(arg0)) {  
53         // 如果为空，则不显示删除图标  
54         setCompoundDrawablesWithIntrinsicBounds(left, null, null, null);  
55     } else {  
56         // 如果非空，则要显示删除图标  
57         setCompoundDrawablesWithIntrinsicBounds(left, null, del_btn, null);  
58     }  
59}
60@Override
61 public void onTextChanged(CharSequence s, int start, int before, int after) {  
62   if (hasFocus) {  
63       if (TextUtils.isEmpty(s)) {  
64           // 如果为空，则不显示删除图标  
65           setCompoundDrawablesWithIntrinsicBounds(left, null, null, null);  
66       } else {  
67           // 如果非空，则要显示删除图标  
68           setCompoundDrawablesWithIntrinsicBounds(left, null, del_btn, null);  
69       }  
70   }

}

1@Override
2public void onFocusChange(View arg0, boolean arg1) {
3	// TODO Auto-generated method stub
4	try {  
5        this.hasFocus = arg1;  
6    } catch (Exception e) {  
7        e.printStackTrace();  
8    }  
9}

}

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

Android 如何自定义EditText 下划线？

解决方法：

@Override

1protected void onDraw(Canvas canvas) {
2	super.onDraw(canvas);
3	mPaint.setColor(color);
4	int x=this.getScrollX();
5	int w=this.getMeasuredWidth();
6	canvas.drawLine(0, this.getHeight() - 1, w+x,
7			this.getHeight() - 1, mPaint);
8}

w：获取控件长度

X：延伸后的长度

最终效果： Android 如何自定义EditText 下划线？

在分享完这个界面的代码设计后，笔者跟大家唠一些新玩意。话说身处在帝都，如果不利用好帝都的丰厚资源，又如何对得起每天吸入的几十斤雾霾？

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Android 如何自定义EditText 下划线？

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Android 如何自定义EditText 下划线？

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本文转自 OneAPM 官方博客

Android 如何自定义EditText 下划线？

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