Android custom View-EditText with the delete button

MainActivity is as follows:

Package cc. textview5; import android. OS. bundle; import android. text. textUtils; import android. view. view; import android. view. view. onClickListener; import android. widget. button; import android. widget. toast; import android. app. activity;/*** Demo Description: * Custom Controls implement EditText with cleanup function ** learning materials: * http://blog.csdn.net/xiaanming/article/details/11066685 ** Thank you very much */public class MainActivity extends Activity {private CleanableEditText success; private Button mLoginButton; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); init ();} private void init () {mUserNameCleanableEditText = (CleanableEditText) findViewById (R. id. userNameEditText); mPassWordCleanableEditText = (CleanableEditText) findViewById (R. id. passwordEditText); mLoginButton = (Button) findViewById (R. id. loginButton); mLoginButton. setOnClickListener (new OnClickListenerImpl ();} private class OnClickListenerImpl implements OnClickListener {@ Overridepublic void onClick (View view) {if (TextUtils. isEmpty (mUserNameCleanableEditText. getText () {mUserNameCleanableEditText. setShakeAnimation (); Toast. makeText (MainActivity. this, "Enter the user name", Toast. LENGTH_SHORT ). show ();} if (TextUtils. isEmpty (mPassWordCleanableEditText. getText () {mPassWordCleanableEditText. setShakeAnimation (); Toast. makeText (MainActivity. this, "enter the password", Toast. LENGTH_SHORT ). show ();}}}}

CleanableEditText is as follows:

Package cc. textview5; import android. content. context; import android. graphics. drawable. drawable; import android. text. editable; import android. text. textWatcher; import android. util. attributeSet; import android. view. motionEvent; import android. view. view; import android. view. animation. animation; import android. view. animation. cycleInterpolator; import android. view. animation. translateAnimation; import android. widget. editText;/*** when the focus and input content change, you must determine whether to display the clean icon on the right */public class CleanableEditText extends EditText {private Drawable mRightDrawable; private boolean isHasFocus; public CleanableEditText (Context context) {super (context); init ();} public CleanableEditText (Context context, AttributeSet attrs) {super (context, attrs); init ();} public CleanableEditText (Context context, AttributeSet attrs, int defStyle) {super (context, attrs, defStyle); init () ;}private void init () {// getCompoundDrawables: // Returns drawables for the left, top, right, and bottom borders. drawable [] drawables = this. getCompoundDrawables (); // obtain the right Drawable // android: drawableRight mRightDrawable = drawables [2] in the layout file; // set the focus change listener this. setOnFocusChangeListener (new FocusChangeListenerImpl (); // set the listening for EditText text changes this. addTextChangedListener (new TextWatcherImpl (); // make the clean icon on the right invisible at initialization setClearDrawableVisible (false );} /*** when the finger is lifted in the area of the clean icon * we will take this as a clear operation * getWidth (): Get the width of the control * event. getX (): coordinates when lifting (the changed coordinates are relative to the control itself) * getTotalPaddingRight (): distance from the left edge of the clean icon to the right edge of the control * getPaddingRight (): the distance from the right edge of the clean icon to the right edge of the control *. * getWidth ()-getTotalPaddingRight () indicates: * The area of the left edge of the clean icon * getWidth () -getPaddingRight () indicates: * The area from the left to the right edge of the clean icon * so the area between the two is just the area of the clean icon */@ Overridepublic boolean onTouchEvent (MotionEvent event) {switch (event. getAction () {case MotionEvent. ACTION_UP: boolean isClean = (event. getX ()> (getWidth ()-getTotalPaddingRight () & (event. getX () <(getWidth ()-getPaddingRight (); if (isClean) {setText ("") ;}break; default: break;} return super. onTouchEvent (event);} private class implements OnFocusChangeListener {@ Overridepublic void onFocusChange (View v, boolean hasFocus) {isHasFocus = hasFocus; if (isHasFocus) {boolean isVisible = getText (). toString (). length ()> = 1; setClearDrawableVisible (isVisible);} else {setClearDrawableVisible (false );}}} // After the input is complete, check whether the clean private class TextWatcherImpl implements TextWatcher {@ Overridepublic void afterTextChanged (Editable s) {boolean isVisible = getText () is displayed (). toString (). length ()> = 1; setClearDrawableVisible (isVisible) ;}@ Overridepublic void beforeTextChanged (CharSequence s, int start, int count, int after) {}@ Overridepublic void onTextChanged (CharSequence s, int start, int before, int count) {}} // hide or show the clean icon protected void setClearDrawableVisible (boolean isVisible) {Drawable rightDrawable; if (isVisible) {rightDrawable = mRightDrawable;} else {rightDrawable = null;} // use the code to set the setCompoundDrawables (getCompoundDrawables () [0], getCompoundDrawables () [1], rightDrawable, getCompoundDrawables () [3]);} // displays an animation to prompt the user to enter public void setShakeAnimation () {this. setAnimation (shakeAnimation (5);} // number of times the CycleTimes Animation is repeated public Animation shakeAnimation (int CycleTimes) {Animation translateAnimation = new TranslateAnimation (0, 10, 0, 10 ); translateAnimation. setInterpolator (new CycleInterpolator (CycleTimes); translateAnimation. setDuration (1000); return translateAnimation ;}}

Main. xml is as follows:

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