自定义可以点击图标的EditText

       在开发APP布局时候经常会看到在EditText的右侧或者左侧出现类似ICON,比如查看密码，点击可以清空输入的字符等，我们通常的做法中在EditText外层再套一层LinearLayout，这无疑增加了布局的复杂度。
       今天我们通过扩展EditText来实现四个drawable都可以点击的功能。

实现思路

       重写onTouchEvent，当用户点击时，判断点击点是否在图标的位置上，如果在就拦截掉点击事件，调用点击图标的回调

实现步骤

• 通过getCompoundDrawables()取得四个方向的drawable

• 取得点击的坐标

• 把坐标转换到drawable的坐标体系,难点为需要考虑到有多个的情况，所以左右的图标y通过文本垂直中线来计算，上下图标的x同理

• 分别判断坐标是否包含在图标区域拦截事件

完整实现类

package com.yy.drawableclickedittextdemo;import android.content.Context;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.MotionEvent;public class ClickDrawableEditText extends android.support.v7.widget.AppCompatEditText {    private static String tag= ClickDrawableEditText.class.getSimpleName();    //点击位置
    private int positionX = 0;    private int positionY;    // 回调接口
    private OnDrawableClickListener onDrawableClickListener;    public ClickDrawableEditText(Context context, AttributeSet attrs) {        super(context, attrs);
    }    public ClickDrawableEditText(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);
    }    public void setOnDrawableClickListener(OnDrawableClickListener onDrawableClickListener) {        this.onDrawableClickListener = onDrawableClickListener;
    }    @Override
    public boolean onTouchEvent(MotionEvent event) {        //图标区域
        Rect bounds;        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            positionX = Math.round(event.getX());
            positionY = Math.round(event.getY());

            Drawable[] ds=this.getCompoundDrawables();
            Drawable drawableRight = ds[2];
            Drawable drawableLeft = ds[0];
            Drawable drawableTop = ds[1];
            Drawable drawableBottom = ds[3];            //计算点击点在Drawable中的位置
            int xClickPosition,yClickPosition;            //长宽
            int w=getWidth();            int h=getHeight();            //文本中心的坐标
            int midX=(w-getTotalPaddingLeft()-getTotalPaddingRight())/2+getTotalPaddingLeft();            int midY=(h-getTotalPaddingTop()-getTotalPaddingBottom())/2+getTotalPaddingTop();            if (drawableLeft != null) {
                bounds = drawableLeft.getBounds();                // 转换到drawableLeft坐标系统
                xClickPosition = positionX-getPaddingLeft();
                yClickPosition = (midY-positionY)+bounds.height()/2;                if (bounds.contains(xClickPosition, yClickPosition) && onDrawableClickListener != null) {
                    onDrawableClickListener.onClick(DrawablePosition.LEFT);
                    event.setAction(MotionEvent.ACTION_CANCEL);                    return false;
                }
            }            if (drawableRight != null) {
                bounds = drawableRight.getBounds();

                xClickPosition = positionX - w + bounds.right +getPaddingRight();
                yClickPosition= (midY-positionY)+bounds.height()/2;                if (bounds.contains(xClickPosition, yClickPosition) && onDrawableClickListener != null) {
                    onDrawableClickListener.onClick(DrawablePosition.RIGHT);
                    event.setAction(MotionEvent.ACTION_CANCEL);                    return false;
                }
            }            if (drawableTop != null) {
                bounds = drawableTop.getBounds();

                xClickPosition = (midX - positionX)+bounds.width()/2;
                yClickPosition= positionY - getPaddingTop();                if (bounds.contains(xClickPosition, yClickPosition) && onDrawableClickListener != null) {
                    onDrawableClickListener.onClick(DrawablePosition.TOP);
                    event.setAction(MotionEvent.ACTION_CANCEL);                    return false;
                }
            }            if(drawableBottom!=null)
            {
                bounds = drawableBottom.getBounds();

                xClickPosition = (midX - positionX)+bounds.width()/2;
                yClickPosition= positionY - h + bounds.height()+ getPaddingBottom();                if (bounds.contains(xClickPosition, yClickPosition) && onDrawableClickListener != null) {
                    onDrawableClickListener.onClick(DrawablePosition.BOTTOM);
                    event.setAction(MotionEvent.ACTION_CANCEL);                    return false;
                }
            }
        }        return super.onTouchEvent(event);
    }    /**
     * 设置点击图标的侦听接口
     */
    public interface OnDrawableClickListener{        public void onClick(int position);
    }    /**
     * 图标的位置方向
     */
    public final static class DrawablePosition{        public final static int LEFT=0;        public final static int TOP=1;        public final static int RIGHT=2;        public final static int BOTTOM=3;
    }
}

引用

在xml布局中引用控件

<com.yy.drawableclickedittext.ClickDrawableEditText
                    android:id="@+id/password"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/prompt_password"
                    android:padding="0dp"
                    android:drawablePadding="10dp"
                    android:imeActionLabel="@string/action_sign_in_short"
                    android:inputType="textPassword"
                    android:maxLines="1"
                    android:singleLine="true"
                    android:drawableRight="@mipmap/city_icon_care"
                    android:drawableLeft="@mipmap/ic_launcher_round"
                    android:drawableTop="@mipmap/city_icon_care"
                    android:drawableBottom="@mipmap/ic_launcher_round"
                    />

在界面中增加点击侦听

mPasswordView.setOnDrawableClickListener(new ClickDrawableEditText.OnDrawableClickListener() {            @Override
            public void onClick(int position) {
                String str="";                switch (position){                    case ClickDrawableEditText.DrawablePosition.LEFT:
                        str="click left";                        break;                    case ClickDrawableEditText.DrawablePosition.TOP:
                        str="click top";                        break;                    case ClickDrawableEditText.DrawablePosition.RIGHT:
                        str="click right";                        break;                    case ClickDrawableEditText.DrawablePosition.BOTTOM:
                        str="click bottom";                        break;

                }
                Toast.makeText(LoginActivity.this,str,Toast.LENGTH_SHORT).show();
            }
        });

作者：waiwaaa
链接：https://www.jianshu.com/p/d0458fccfcb5