• 带清空按钮的EditText


    public class ClearEditText extends EditText implements OnFocusChangeListener,
            TextWatcher {
        // 删除按钮的引用
        private Drawable mClearDrawable;
        // 控件是否有焦点
        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() {
            // 获取EditText的DrawableRight,假如没有设置使用默认的图片
            mClearDrawable = getCompoundDrawables()[2];
            if (mClearDrawable == null) {
                mClearDrawable = getResources().getDrawable(
                        R.drawable.delete_selector);
            }
            mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(),
                    mClearDrawable.getIntrinsicHeight());
            // 默认设置隐藏图标
            setClearIconVisible(false);
            // 设置焦点改变的监听
            setOnFocusChangeListener(this);
            // 设置输入框里面内容发生改变的监听
            addTextChangedListener(this);
        }
        @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);
        }
        /**
         * 当ClearEditText焦点发生变化的时候,判断里面字符串长度设置清除图标的显示与隐藏
         */
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            this.hasFoucs = hasFocus;
            if (hasFocus) {
                setClearIconVisible(getText().length() > 0);
            } else {
                setClearIconVisible(false);
            }
        }
        /**
         * 设置清除图标的显示与隐藏,调用setCompoundDrawables为EditText绘制上去
         */
        protected void setClearIconVisible(boolean visible) {
            Drawable right = visible ? mClearDrawable : null;
            setCompoundDrawables(getCompoundDrawables()[0],
                    getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
        }
        /**
         * 当输入框里面内容发生变化的时候回调的方法
         */
        @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) {
        }
    }
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  • 原文地址:https://www.cnblogs.com/wenhui92/p/6242712.html
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