EditText末尾添加删除小圆圈一键清空

来源：互联网发布：java 静态变量泛型编辑：程序博客网时间：2024/05/01 04:08

公司项目需要，整理的时候整理出来！下次再用

public class ClearEditText extends EditText implements View.OnFocusChangeListener,TextWatcher {    /**     * 删除按钮的引用     */    private Drawable mClearDrawable;    /**     * 控件是否有焦点     */    private boolean hasFocus;    public ClearEditText(Context context) {        this(context,null);    }    public ClearEditText(Context context, AttributeSet attrs){        //这里构造方法也很重要，不加这个很多属性不能再XML里面定义        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,假如没有设置我们就使用默认的图片        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 (mClearDrawable != null && event.getAction() == MotionEvent.ACTION_UP) {            int x = (int) event.getX();            //判断触摸点是否在水平范围内            boolean isInnerWidth = (x > (getWidth() - getTotalPaddingRight())) &&                    (x < (getWidth() - getPaddingRight()));            //获取删除图标的边界，返回一个Rect对象            Rect rect = mClearDrawable.getBounds();            //获取删除图标的高度            int height = rect.height();            int y = (int) event.getY();            //计算图标底部到控件底部的距离            int distance = (getHeight() - height) / 2;            //判断触摸点是否在竖直范围内(可能会有点误差)            //触摸点的纵坐标在distance到（distance+图标自身的高度）之内，则视为点中删除图标            boolean isInnerHeight = (y > distance) && (y < (distance + height));            if (isInnerHeight && isInnerWidth) {                this.setText("");            }        }        return super.onTouchEvent(event);    }    /**     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去     *     * @param visible     */    private void setClearIconVisible(boolean visible) {        Drawable right = visible ? mClearDrawable : null;        setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1],                right, getCompoundDrawables()[3]);    }    /**     * 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.hasFocus = hasFocus;        if (hasFocus) {            setClearIconVisible(getText().length() > 0);        } else {            setClearIconVisible(false);        }    }    /**     * 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 text, int start, int lengthBefore, int lengthAfter) {        if (hasFocus) {            setClearIconVisible(text.length() > 0);        }    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    @Override    public void afterTextChanged(Editable s) {    }}

复制进项目。

添加drawable delete_selector.xml

<selector  xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_pressed="true" android:drawable="@mipmap/search_clear_pressed" />    <item android:drawable="@mipmap/search_clear_normal" /></selector>

两个小圆圈删除图标已经上传

直接用自定义控件就行了。不用调用。直接现在布局上面就可以了

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