yusheng-android/moduleUtil/src/main/java/com/qxcm/moduleutil/widget/ClearEditText.java

package com.qxcm.moduleutil.widget;

import android.content.Context;
import android.graphics.Rect;
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 androidx.appcompat.widget.AppCompatEditText;

import com.qxcm.moduleutil.R;


/**
 * 带删除按钮的editText
 * Created by air on 2017/1/12.
 * updated by air on 2017/3/20
 */
public class ClearEditText extends AppCompatEditText implements View.OnFocusChangeListener, TextWatcher {

    //EditText右侧的删除按钮
    private Drawable mClearDrawable;

    private boolean hasFocus;

    private onFocusListener onFocusListener;

    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,假如没有设置我们就使用默认的图片
        mClearDrawable = getCompoundDrawables()[2];
        if (mClearDrawable == null) {
            mClearDrawable = getResources().getDrawable(R.mipmap.common_et_clear_icon);
        }
        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);
    }

    /* *
     * @说明：isInnerWidth, isInnerHeight为ture，触摸点在删除图标之内，则视为点击了删除图标
     * event.getX() 获取相对应自身左上角的X坐标
     * event.getY() 获取相对应自身左上角的Y坐标
     * getWidth() 获取控件的宽度
     * getHeight() 获取控件的高度
     * getTotalPaddingRight() 获取删除图标左边缘到控件右边缘的距离
     * getPaddingRight() 获取删除图标右边缘到控件右边缘的距离
     * isInnerWidth:
     *  getWidth() - getTotalPaddingRight() 计算删除图标左边缘到控件左边缘的距离
     *  getWidth() - getPaddingRight() 计算删除图标右边缘到控件左边缘的距离
     * isInnerHeight:
     *  distance 删除图标顶部边缘到控件顶部边缘的距离
     *  distance + height 删除图标底部边缘到控件顶部边缘的距离
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            if (getCompoundDrawables()[2] != null) {
                int x = (int) event.getX();
                int y = (int) event.getY();
                Rect rect = getCompoundDrawables()[2].getBounds();
                int height = rect.height();
                int distance = (getHeight() - height) / 2;
                boolean isInnerWidth = x > (getWidth() - getTotalPaddingRight()) && x < (getWidth() - getPaddingRight());
                boolean isInnerHeight = y > distance && y < (distance + height);
                if (isInnerWidth && isInnerHeight) {
                    this.setText("");
                }
            }
        }
        return super.onTouchEvent(event);
    }

    public 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，
     * 输入长度为零，隐藏删除图标，否则，显示删除图标
     */
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        this.hasFocus = hasFocus;
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
            if (onFocusListener != null) {
                onFocusListener.onFocus();
            }
        } else {
            setClearIconVisible(false);
        }
    }


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

    }

    @Override
    public void afterTextChanged(Editable s) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int count, int after) {
        if (hasFocus) {
            setClearIconVisible(s.length() > 0);
        }
    }

    public interface onFocusListener {
        void onFocus();
    }


    public void setOnFocusListener(ClearEditText.onFocusListener onFocusListener) {
        this.onFocusListener = onFocusListener;
    }
}