自定义EditText :下划线，左侧有可变图标，右侧有可变删除标志

项目要求：1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edittext,如图

记录制作过程：

第一版本：

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() {@Overridepublic void onTextChanged(CharSequence arg0, int arg1, int arg2,int arg3) {}@Overridepublic void beforeTextChanged(CharSequence arg0, int arg1,int arg2, int arg3) {}@Overridepublic void afterTextChanged(Editable arg0) {setDrawable();}});setDrawable();}@Overrideprotected 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@Overridepublic 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);}@Overrideprotected void onFocusChanged(boolean focused, int direction,Rect previouslyFocusedRect) {super.onFocusChanged(focused, direction, previouslyFocusedRect);if (focused) {setStatus(STATUS_FOCUSED);} else {setStatus(STATUS_UNFOCUSED);}}@Overrideprotected void finalize() throws Throwable {super.finalize();};public void setColor(int color) {this.color = color;this.setTextColor(color);invalidate();}}

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=""  

onTouchEvent  当手机点击时，第一个先走的函数，当点击右侧删除图标是清空edittext

setStatus  更具不同的状态，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{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);}@Overrideprotected 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@Overridepublic 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();          }      }  @Overrideprotected 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);}}@Overrideprotected void finalize() throws Throwable {super.finalize();};public void setColor(int color) {this.color = color;this.setTextColor(color);invalidate();}@Overridepublic void afterTextChanged(Editable arg0) {// TODO Auto-generated method stubpostInvalidate();}@Overridepublic 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);             }         }     }@Overridepublic void onFocusChange(View arg0, boolean arg1) {// TODO Auto-generated method stubtry {              this.hasFocus = arg1;          } catch (Exception e) {              e.printStackTrace();          }  }  }

效果图：

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

解决办法：

@Overrideprotected 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);}

w：获取控件长度

X：延伸后的长度

最终效果：

参考文献：

http://www.oschina.net/question/54100_32466
http://www.oschina.net/android/125/attrs-xml
http://blog.csdn.net/llew2011/article/details/28909193
http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2013/0307/986.html