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;public class ClearEditText extends EditText implements View.OnFocusChangeListener,TextWatcher{   //刪除按鈕的引用  private Drawable mClearDrawable;  //控件是否有焦點  private boolean hasFoucs;  public ClearEditText(Context context) {    this(context, null);  }  public ClearEditText(Context context, AttributeSet attrs) {    // 這里構造方法也很重要，不加這個很多屬性不能再XML里面定義    this(context, attrs, android.R.attr.editTextStyle);  }  public ClearEditText(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    init();  }   private void init() {      //獲取EditText的DrawableRight,假如沒有設置我們就使用默認的圖片      mClearDrawable = getCompoundDrawables()[2];      if (mClearDrawable == null) {        // throw new NullPointerException("You can add drawableRight attribute in XML");        mClearDrawable = getResources().getDrawable(R.drawable.selector_ic_delete);      }      //getIntrinsicWidth()取得的是Drawable在手機上的寬度，所以不同分辨率下獲取到的值是不同的，關鍵所在處      mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());      //默認設置隱藏圖標      setClearIconVisible(false);      //設置焦點改變的監聽      setOnFocusChangeListener(this);      //設置輸入框里面內容發生改變的監聽      addTextChangedListener(this);    }    /**     * 因為我們不能直接給EditText設置點擊事件，所以我們用記住我們按下的位置來模擬點擊事件     * 當我們按下的位置 在 EditText的寬度 - 圖標到控件右邊的間距 - 圖標的寬度 和     * EditText的寬度 - 圖標到控件右邊的間距之間我們就算點擊了圖標，豎直方向就沒有考慮     */    @Override    public boolean onTouchEvent(MotionEvent event) {      if (event.getAction() == MotionEvent.ACTION_UP) {        if (getCompoundDrawables()[2] != null) {          boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())              && (event.getX() < ((getWidth() - getPaddingRight())));          if (touchable) {            this.setText("");          }        }      }      return super.onTouchEvent(event);    }    /**     * 當ClearEditText焦點發生變化的時候，判斷里面字符串長度設置清除圖標的顯示與隱藏     */    @Override    public void onFocusChange(View v, boolean hasFocus) {      this.hasFoucs = hasFocus;      if (hasFocus) {        setClearIconVisible(getText().length() > 0);      } else {        setClearIconVisible(false);      }    }    /**     * 設置清除圖標的顯示與隱藏，調用setCompoundDrawables為EditText繪制上去     * @param visible     */    protected void setClearIconVisible(boolean visible) {      Drawable right = visible ? mClearDrawable : null;      setCompoundDrawables(getCompoundDrawables()[0],          getCompoundDrawables()[1], right, getCompoundDrawables()[3]);    }    /**     * 當輸入框里面內容發生變化的時候回調的方法     */    @Override    public void onTextChanged(CharSequence s, int start, int count,int after) {      if(hasFoucs){        setClearIconVisible(s.length() > 0);      }    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count,int after) {    }    @Override    public void afterTextChanged(Editable s) {    }    /**     * 設置晃動動畫     */    public void setShakeAnimation(){      this.setAnimation(shakeAnimation(5));    }    /**     * 晃動動畫     * @param counts 1秒鐘晃動多少下     * @return     */    public static Animation shakeAnimation(int counts){      Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);      translateAnimation.setInterpolator(new CycleInterpolator(counts));      translateAnimation.setDuration(1000);      return translateAnimation;    }}

import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;import android.app.Activity;public class MainActivity extends Activity {  private Button btnLogin;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_login);    btnLogin = (Button) this.findViewById(R.id.btnLogin);  }  public void login(View view) {    Toast.makeText(this, "登陸", Toast.LENGTH_LONG).show();  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:background="#ffffffff"  android:orientation="vertical"  android:padding="4.0dip" >  <com.xuliugen.clearedittext.ClearEditText    android:id="@+id/etxtEmail"    style="@style/editText"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_marginTop="30.0dip"    android:drawableLeft="@drawable/icon_reg_name"    android:drawablePadding="10.0dip"    android:hint="使用郵箱登陸" />  <com.xuliugen.clearedittext.ClearEditText    android:id="@+id/etxtPwd"    style="@style/editText"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_marginTop="20.0dip"    android:drawableLeft="@drawable/icon_reg_password"    android:drawablePadding="10.0dip"    android:hint="輸入登陸密碼"    android:inputType="textPassword" />  <Button    android:id="@+id/btnLogin"    style="@style/bigGreenButton"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_marginTop="20.0dip"    android:onClick="login"    android:text="登陸" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">  <item android:state_enabled="false"><shape android:shape="rectangle">      <corners android:radius="2.0dip" />      <solid android:color="@color/green_btn_color_disable" />    </shape></item>  <item android:state_pressed="true"><shape android:shape="rectangle">      <corners android:radius="2.0dip" />      <solid android:color="@color/green_btn_color_pressed" />    </shape></item>  <item><shape android:shape="rectangle">      <corners android:radius="2.0dip" />      <solid android:color="@color/green_btn_color_normal" />    </shape></item></selector>

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">  <item android:drawable="@drawable/input_bar_bg_active" android:state_focused="true"/>  <item android:drawable="@drawable/input_bar_bg_normal"/></selector>