Android 带有删除按钮的EditText

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描述:  * 自定义控件实现带清除功能的EditText  *  * 学习资料:  * http://blog.csdn.net/xiaanming/article/details/11066685  *  * Thank you very much  */ public class MainActivity extends Activity {   private CleanableEditText mUserNameCleanableEditText;   private CleanableEditText mPassWordCleanableEditText;   private Button mLoginButton;   @Override   protected 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 {     @Override     public void onClick(View view) {       if (TextUtils.isEmpty(mUserNameCleanableEditText.getText())) {         mUserNameCleanableEditText.setShakeAnimation();         Toast.makeText(MainActivity.this, "请输入用户名", Toast.LENGTH_SHORT).show();       }        if (TextUtils.isEmpty(mPassWordCleanableEditText.getText())) {         mPassWordCleanableEditText.setShakeAnimation();         Toast.makeText(MainActivity.this, "请输入密码", Toast.LENGTH_SHORT).show();       }     }    }     } 

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; /**  * 在焦点变化时和输入内容发生变化时均要判断是否显示右边clean图标  */ 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();          //取得right位置的Drawable     //即我们在布局文件中设置的android:drawableRight     mRightDrawable=drawables[2];            //设置焦点变化的监听     this.setOnFocusChangeListener(new FocusChangeListenerImpl());     //设置EditText文字变化的监听     this.addTextChangedListener(new TextWatcherImpl());     //初始化时让右边clean图标不可见     setClearDrawableVisible(false);   }         /**    * 当手指抬起的位置在clean的图标的区域    * 我们将此视为进行清除操作    * getWidth():得到控件的宽度    * event.getX():抬起时的坐标(改坐标是相对于控件本身而言的)    * getTotalPaddingRight():clean的图标左边缘至控件右边缘的距离    * getPaddingRight():clean的图标右边缘至控件右边缘的距离    * 于是:    * getWidth() - getTotalPaddingRight()表示:    * 控件左边到clean的图标左边缘的区域    * getWidth() - getPaddingRight()表示:    * 控件左边到clean的图标右边缘的区域    * 所以这两者之间的区域刚好是clean的图标的区域    */   @Override   public 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 FocusChangeListenerImpl implements OnFocusChangeListener{     @Override     public void onFocusChange(View v, boolean hasFocus) {        isHasFocus=hasFocus;        if (isHasFocus) {          boolean isVisible=getText().toString().length()>=1;          setClearDrawableVisible(isVisible);       } else {          setClearDrawableVisible(false);       }     }        }      //当输入结束后判断是否显示右边clean的图标   private class TextWatcherImpl implements TextWatcher{     @Override     public void afterTextChanged(Editable s) {        boolean isVisible=getText().toString().length()>=1;        setClearDrawableVisible(isVisible);     }      @Override     public void beforeTextChanged(CharSequence s, int start, int count,int after) {            }      @Override     public void onTextChanged(CharSequence s, int start, int before,int count) {            }        }        //隐藏或者显示右边clean的图标   protected void setClearDrawableVisible(boolean isVisible) {     Drawable rightDrawable;     if (isVisible) {       rightDrawable = mRightDrawable;     } else {       rightDrawable = null;     }     //使用代码设置该控件left, top, right, and bottom处的图标     setCompoundDrawables(getCompoundDrawables()[0],getCompoundDrawables()[1],                 rightDrawable,getCompoundDrawables()[3]);   }     // 显示一个动画,以提示用户输入   public void setShakeAnimation() {     this.setAnimation(shakeAnimation(5));   }    //CycleTimes动画重复的次数   public Animation shakeAnimation(int CycleTimes) {     Animation translateAnimation = new TranslateAnimation(0, 10, 0, 10);     translateAnimation.setInterpolator(new CycleInterpolator(CycleTimes));     translateAnimation.setDuration(1000);     return translateAnimation;   }  } 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:paddingLeft="20dip"   android:paddingRight="20dip"   >    <cc.textview5.CleanableEditText     android:id="@+id/userNameEditText"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:hint="username"     android:layout_marginTop="30dip"     android:drawableLeft="@drawable/icon_user"     android:drawableRight="@drawable/clean_selector"      />       <cc.textview5.CleanableEditText     android:id="@+id/passwordEditText"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:hint="password"     android:password="true"     android:layout_marginTop="100dip"     android:drawableLeft="@drawable/account_icon"     android:drawableRight="@drawable/clean_selector"      />        <Button      android:id="@+id/loginButton"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="Login"     android:layout_marginTop="155dip"      />  </RelativeLayout>