自定义控件：实现加减功能

XML：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="wrap_content">
    <ImageView
        android:id="@id/back"
        android:layout_centerVertical="true"
        android:textColor="@color/white"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"/>
    <EditText
        android:id="@+id/toolbar_searchview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入内容"
        android:textSize="14sp"
        android:gravity="center"
        android:padding="3dp"
        android:background="@drawable/toolbar_edittext_bg_shape"
        android:layout_centerVertical="true"
        android:textColor="@color/white"
        android:textColorHint="@color/white"
        android:drawableLeft="@mipmap/icon_search"
        android:visibility="gone"
        />
    <TextView
        android:id="@+id/toolbar_title"
        android:text="haha"
        android:textSize="20sp"
        android:textColor="@color/white"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        />
    <!--style="@android:style/Widget.Material.Toolbar.Button.Navigation"-->
    <Button
        android:id="@+id/toolbar_rightButton"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:textColor="@color/white"
        style="@android:style/Widget.Material.Toolbar.Button.Navigation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="visible"/>

</RelativeLayout>

attrs ：

    <declare-styleable name="NumberAddView">
        <!--<attr name="leftButtonIcon" format="reference"/>-->
        <attr name="value" format="integer"/>
        <attr name="maxNum" format="integer"/>
        <attr name="minNum" format="integer"/>
    </declare-styleable>

Java代码：

package com.vily.cartshop.ui;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.annotation.Nullable;
import android.support.annotation.StringRes;
import android.support.v7.widget.TintTypedArray;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;

import com.vily.cartshop.R;

/**
 * description :
 * user : Administrator
 * Created by Administrator on 2017\11\30 0030.
 */

public class MyToolBar extends Toolbar {
    private LayoutInflater mLayoutInflater;
    private View mView;
    private EditText mToolbar_searchview;
    private Button mToolbar_rightButton;
    private TextView mToolbar_title;
    private ImageView mBack;

    public MyToolBar(Context context) {
        this(context,null);
    }

    public MyToolBar(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public MyToolBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        initView();

        setContentInsetsRelative(10,10);
        if(attrs!=null){
            final TintTypedArray a = TintTypedArray.obtainStyledAttributes(getContext(), attrs,
                    R.styleable.MyToolBar, defStyleAttr, 0);
            //  从属性中获取  rightButtonIcon
            Drawable rightIcon = a.getDrawable(R.styleable.MyToolBar_rightButtonIcon);
            if(rightIcon!=null){
                setRightBtnIcon(rightIcon);
            }
            //  从属性中获取  rightButtonTitle
            String rightTitle = a.getString(R.styleable.MyToolBar_rightButtonTitle);
            if(rightTitle!=null){
                setRightBtnTitle(rightTitle);
            }
            //  从属性中获取  backIcon
            Drawable backIcon = a.getDrawable(R.styleable.MyToolBar_backIcon);
            if(backIcon!=null){
                setBackBtnIcon(backIcon);
            }

            boolean isShowSearchView = a.getBoolean(R.styleable.MyToolBar_isShowSearchView, false);
            if(isShowSearchView){
                showSearchView();
                hideTitleView();
            }
            //  资源回收
            a.recycle();

        }
    }

    private void initView() {

        if(mView==null){
            mLayoutInflater=LayoutInflater.from(getContext());
            mView = mLayoutInflater.inflate(R.layout.layout_toolbar, null);
            mToolbar_searchview = (EditText) mView.findViewById(R.id.toolbar_searchview);
            mToolbar_title = (TextView) mView.findViewById(R.id.toolbar_title);
            mToolbar_rightButton = (Button) mView.findViewById(R.id.toolbar_rightButton);
            mBack = (ImageView) mView.findViewById(R.id.back);

            //然后使用LayoutParams把控件添加到子view中
            LayoutParams params=new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.CENTER_HORIZONTAL);
            addView(mView,params);
        }
    }

    @Override
    public void setTitle(@StringRes int resId) {
        setTitle(getContext().getText(resId));
    }
    //  设置字体  重写父类的 settitle 方法
    @Override
    public void setTitle(CharSequence title) {
        initView();
        if(mToolbar_title!=null){
            mToolbar_title.setText(title);
            showTitleView();
        }
    }

    //  显示 title
    private void showTitleView() {
        if(mToolbar_title!=null){
            mToolbar_title.setVisibility(View.VISIBLE);
        }
    }
    //  隐藏title
    private void hideTitleView() {
        if(mToolbar_title!=null){
            mToolbar_title.setVisibility(View.GONE);
        }
    }
    //   设置右侧ImageBtn  的图片
    public void setRightBtnIcon(Drawable icon){
        if(mToolbar_rightButton!=null){
            mToolbar_rightButton.setBackgroundDrawable(icon);
            mToolbar_rightButton.setVisibility(View.VISIBLE);
        }
    }
    //   设置右侧  ImageBtn 的图片
    //   设置右侧  ImageBtn 的图片
    public void setRightBtnIcon(int icon){
        setRightBtnIcon(getResources().getDrawable(icon));
    }
    //   设置右侧ImageBtn  的title
    public void setRightBtnTitle(CharSequence title){
        if(mToolbar_rightButton!=null){
            mToolbar_rightButton.setText(title);
            mToolbar_rightButton.setVisibility(View.VISIBLE);
        }
    }
    //   设置右侧  ImageBtn 的title
    private void setRightBtnTitle(int ResId){
        setRightBtnTitle(getContext().getText(ResId));
    }
    //   设置左侧图片
    private void setBackBtnIcon(Drawable icon){
        if(mBack!=null){
            mBack.setImageDrawable(icon);
            mBack.setVisibility(View.VISIBLE);
        }
    }
    //   设置左侧图片
    private void setBackBtnIcon(int icon){
        setRightBtnIcon(getResources().getDrawable(icon));
    }
    private void showSearchView() {
        if(mToolbar_searchview!=null){
            mToolbar_searchview.setVisibility(View.VISIBLE);
        }
    }
    public void hideSearchView() {
        if(mToolbar_searchview!=null){
            mToolbar_searchview.setVisibility(View.GONE);
        }
    }

    public void setRightBtnOnClick(OnClickListener listener){
        mToolbar_rightButton.setOnClickListener(listener);
    }
    public void setBackBtnOnClick(OnClickListener listener){
        mBack.setOnClickListener(listener);
    }

    public Button getRightBtn(){
        return mToolbar_rightButton;
    }
}