? ? ? ?在開發(fā)APP布局時(shí)候經(jīng)常會(huì)看到在EditText的右側(cè)或者左側(cè)出現(xiàn)類似ICON,比如查看密碼，點(diǎn)擊可以清空輸入的字符等，我們通常的做法中在EditText外層再套一層LinearLayout，這無疑增加了布局的復(fù)雜度。
? ? ? ?今天我們通過擴(kuò)展EditText來實(shí)現(xiàn)四個(gè)drawable都可以點(diǎn)擊的功能。

實(shí)現(xiàn)思路

? ? ? ?重寫onTouchEvent，當(dāng)用戶點(diǎn)擊時(shí)，判斷點(diǎn)擊點(diǎn)是否在圖標(biāo)的位置上，如果在就攔截掉點(diǎn)擊事件，調(diào)用點(diǎn)擊圖標(biāo)的回調(diào)

實(shí)現(xiàn)步驟

• 通過getCompoundDrawables()取得四個(gè)方向的drawable
• 取得點(diǎn)擊的坐標(biāo)
• 把坐標(biāo)轉(zhuǎn)換到drawable的坐標(biāo)體系,難點(diǎn)為需要考慮到有多個(gè)的情況，所以左右的圖標(biāo)y通過文本垂直中線來計(jì)算，上下圖標(biāo)的x同理
• 分別判斷坐標(biāo)是否包含在圖標(biāo)區(qū)域攔截事件

完整實(shí)現(xiàn)類

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();
    //點(diǎn)擊位置
    private int positionX = 0;
    private int positionY;
    // 回調(diào)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) {
        //圖標(biāo)區(qū)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];

            //計(jì)算點(diǎn)擊點(diǎn)在Drawable中的位置
            int xClickPosition,yClickPosition;
            //長寬
            int w=getWidth();
            int h=getHeight();

            //文本中心的坐標(biāo)
            int midX=(w-getTotalPaddingLeft()-getTotalPaddingRight())/2+getTotalPaddingLeft();
            int midY=(h-getTotalPaddingTop()-getTotalPaddingBottom())/2+getTotalPaddingTop();

            if (drawableLeft != null) {
                bounds = drawableLeft.getBounds();
                // 轉(zhuǎn)換到drawableLeft坐標(biāo)系統(tǒng)
                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);
    }

    /**
     * 設(shè)置點(diǎn)擊圖標(biāo)的偵聽接口
     */
    public interface OnDrawableClickListener{
        public void onClick(int position);
    }

    /**
     * 圖標(biāo)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"
                    />

在界面中增加點(diǎn)擊偵聽

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();
            }
        });

demo下載

如果需要完整demo,請(qǐng)點(diǎn)擊GitHub下載鏈接