EditText裡面帶刪除按鈕在各種App裡面已經很常見了，如下：

所需的圖片資源：

下面直接貼上全部程式碼：

public class ClearEditText extends EditText implements OnFocusChangeListener,
        TextWatcher {

    private Drawable mClearDrawable;

    private boolean hasFoucs;

    public ClearEditText(Context context) {
        this(context, null
 
);
    }

    public ClearEditText(Context context, AttributeSet attrs) {
        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,假如沒有設定我們就使用預設的圖片
        mClearDrawable = getCompoundDrawables()[2];
        if (mClearDrawable == null) {
            mClearDrawable = getResources().getDrawable(
                    R.drawable.nickname_delete);
        }
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(),
                mClearDrawable.getIntrinsicHeight());
        setClearIconVisible(false
 
);
        setOnFocusChangeListener(this);
        addTextChangedListener(this);
    }

    /**
     * 因為我們不能直接給EditText設定點選事件，所以我們用記住我們按下的位置來模擬點選事件 當我們按下的位置 在 EditText的寬度 -
     * 圖示到控制元件右邊的間距 - 圖示的寬度 和 EditText的寬度 - 圖示到控制元件右邊的間距之間我們就算點選了圖示，豎直方向就沒有考慮
     */
    @SuppressLint("ClickableViewAccessibility")
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();
        //監聽手指的按下、滑動、擡起來達到圖片的點選，按住效果
        switch (action) {
        case MotionEvent.ACTION_DOWN:
            if (getCompoundDrawables()[2] != null && getText().length() > 0) {
                boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
                        && (event.getX() < ((getWidth() - getPaddingRight())));
                if (touchable) {
                    setIconChange(R.drawable.nickname_delete2);
                }
            }
            break;
        case MotionEvent.ACTION_MOVE:

            if (getCompoundDrawables()[2] != null && getText().length() > 0) {
                boolean touchable = (event.getX() > (getWidth() - getTotalPaddingRight()) && (event
                        .getX() < ((getWidth() - getPaddingRight()))))
                        && (event.getY() > 0 && event.getY() < getHeight() + 100);

                if (touchable) {
                    setIconChange(R.drawable.nickname_delete2);
                } else {
                    setIconChange(R.drawable.nickname_delete);
                }
            }

            break;
        case MotionEvent.ACTION_UP:
            if (getCompoundDrawables()[2] != null && getText().length() > 0) {
                setIconChange(R.drawable.nickname_delete);
                boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
                        && (event.getX() < ((getWidth() - getPaddingRight())))
                        && (event.getY() > 0 && event.getY() < getHeight());

                if (touchable) {
                    this.setText("");
                }
            }
            break;
        }

        return super.onTouchEvent(event);
    }

    /**
     * 當ClearEditText焦點發生變化的時候，判斷裡面字串長度設定清除圖示的顯示與隱藏
     */
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        this.hasFoucs = hasFocus;
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
        } else {
            setClearIconVisible(false);
        }
    }

    /**
     * 設定清除圖示的顯示與隱藏，呼叫setCompoundDrawables為EditText繪製上去
     * 
     * @param visible
     */
    protected void setClearIconVisible(boolean visible) {
        Drawable right = visible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }

    /**
     * 設定清除圖示的點選效果變化
     */
    private void setIconChange(int res) {
        mClearDrawable = getResources().getDrawable(res);

        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(),
                mClearDrawable.getIntrinsicHeight());
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], mClearDrawable,
                getCompoundDrawables()[3]);

    }

    /**
     * 當輸入框裡面內容發生變化的時候回撥的方法TextWatcher
     */
    @Override
    public void onTextChanged(CharSequence s, int start, int count, int after) {
        if (hasFoucs) { 
        //當edittext裡面有內容時顯示刪除圖示
            setClearIconVisible(s.length() > 0);
        }
    }

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

    }

    @Override
    public void afterTextChanged(Editable s) {

    }

}

註釋已經寫的差不多了，這裡就不多說了。使用方法（跟正常EditText一樣使用）：
在xml中：

<控制元件所在包路徑.ClearEditText
                    android:id="@+id/clear_et"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:ems="11"
                    android:hint="請輸入您的手機號"
                    android:inputType="numberDecimal"
                    android:maxEms="11"
                    android:maxLength="11"
                    android:paddingBottom="12dp"
                    android:paddingLeft="10dp"
                    android:paddingRight="10dp"
                    android:paddingTop="12dp"
                    android:singleLine="true"
                    android:text=""
                    android:textColor="#000000"
                    android:textColorHint="#bbbbbb"
                    android:textSize="16sp" />