轉載地址。如有轉載請標明地址

 demo下載：http://download.csdn.net/detail/day_moon/9664470

效果圖：

ClearEditText類的定義

public class ClearEditText extends EditText implements View.OnFocusChangeListener, TextWatcher {

    private Drawable mClearDrawable;//刪除按鈕
private boolean hasFoucs;//是否有焦點
public ClearEditText(Context context) {
        this
 
(context, null);
    }


    public ClearEditText(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.editTextStyle);  //不加該屬性，不能在配置檔案裡面定義
}

    public ClearEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void 
 
init() {
        mClearDrawable = getCompoundDrawables()[2];//獲取刪除的圖片
if (mClearDrawable == null) {
            mClearDrawable = getResources().getDrawable(R.drawable.delete_selector);
        }
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());
        setClearIconVisible(false
 
);
        setOnFocusChangeListener(this);
        addTextChangedListener(this);
    }

    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);
    }

    @Override
public void onFocusChange(View v, boolean hasFocus) {
        this.hasFoucs = hasFocus;
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
        } else {
            setClearIconVisible(false);
        }
    }

    public void setClearIconVisible(boolean visible) {
        Drawable right = visible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }


    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    public void afterTextChanged(Editable s) {
    }

    /**
     * 當輸入框裡面內容發生變化的時候回撥的方法
     */
@Override
public void onTextChanged(CharSequence s, int start, int count, int after) {
        if (hasFoucs) {
            setClearIconVisible(s.length() > 0);
        }
    }

    public void setShakeAnimation() {
        this.setAnimation(shakeAnimation(5));//設定晃動動畫
}

    private static Animation shakeAnimation(int counts) {
        Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
        translateAnimation.setInterpolator(new CycleInterpolator(counts));
        translateAnimation.setDuration(1000);
        return translateAnimation;
    }

}

MainActivity 主類：

public class MainActivity extends Activity {

    private Toast mToast;
    public Button bt_login;
    public ClearEditText username, password;

    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        username = (ClearEditText) findViewById(R.id.username);

        password = (ClearEditText) findViewById(R.id.password);
        bt_login = (Button) findViewById(R.id.login);
        bt_login.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if (TextUtils.isEmpty(username.getText())){
                    username.setShakeAnimation();
                    Toast.makeText(MainActivity.this,"使用者名稱不能為空！",Toast.LENGTH_LONG).show();
                    return;
                }
                if(TextUtils.isEmpty(password.getText())){
                    password.setShakeAnimation();
                    Toast.makeText(MainActivity.this,"密碼不能為空！",Toast.LENGTH_LONG).show();
                    return;
                }

            }
        });

    }

}

<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">


    <view.ClearEditText
android:id="@+id/username"
android:layout_marginTop="60dp"
android:layout_width="fill_parent"
android:drawableLeft="@mipmap/icon_user"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:singleLine="true"
android:drawableRight="@drawable/delete_selector"
android:hint="輸入使用者名稱"
android:layout_height="wrap_content" >

    </view.ClearEditText>

    <view.ClearEditText
android:id="@+id/password"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:layout_marginTop="10dip"
android:drawableLeft="@mipmap/account_icon"
android:hint="輸入密碼"
android:singleLine="true"
android:password="true"
android:drawableRight="@drawable/delete_selector"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/username">
    </view.ClearEditText>

    <Button
android:id="@+id/login"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:textSize="18sp"
android:textColor="@android:color/white"
android:layout_below="@+id/password"
android:layout_marginTop="25dp"
android:text="登入" />

</RelativeLayout>