一个简单的购物车加减按钮

一个简单的购物车加减按钮,自定义控件实现,非常简单,有兴趣的可以自己尝试一下

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.shizhibang.jdcom.R;
public class NumberButton extends RelativeLayout implements View.OnClickListener {

    private ImageView jia;
    private ImageView jian;
    private TextView num;

    public NumberButton(Context context) {
        this(context,null);
    }
    public NumberButton(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public NumberButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
    }
    private void init(Context context, AttributeSet attrs) {
        View view = View.inflate(context, R.layout.num, null);
        addView(view);
        jia = view.findViewById(R.id.jia);
        jian = view.findViewById(R.id.jian);
        num = view.findViewById(R.id.num);
    }
    private int sum=0;

    public NumberButton setCurrentNumber(int sum) {
        this.sum = sum;
        num.setText(sum+"");
        return this;
    }
    private int MinNumber=0;
    private int MaxNumber=0;
    public NumberButton setMinNumber(int minNumber) {
        MinNumber = minNumber;
        return this;
    }

    public NumberButton setMaxNumber(int maxNumber) {
        MaxNumber = maxNumber;
        return this;
    }

    public interface OnNumberChangeListener
    {
        void OnNumberChangeListener(int sum);
    }
    private OnNumberChangeListener onClickListener;

    public void setOnNumberChangeListener(OnNumberChangeListener onClickListener) {
        this.onClickListener = onClickListener;
        jia.setOnClickListener(this);
        jian.setOnClickListener(this);
    }


    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.jia:
                if (sum>=MaxNumber)
                    return;
                sum++;
                break;
            case R.id.jian:
                if (sum<=MinNumber)
                    return;
                sum--;
                break;
        }
        num.setText(sum+"");
        onClickListener.OnNumberChangeListener(sum);
    }
}
下面是控件的布局里面的加减号可以自行定义

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:gravity="center"
    android:orientation="horizontal"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/jian"
    android:layout_width="@dimen/x20"
    android:layout_height="@dimen/x20"
    android:src="@mipmap/jian"/>

    <TextView
        android:id="@+id/num"
        android:layout_width="@dimen/x20"
        android:layout_height="match_parent"
        android:background="@drawable/tvbg"
        android:gravity="center"
        android:text="0"
        android:textSize="20sp" />

    <ImageView
        android:id="@+id/jia"
        android:layout_width="@dimen/x20"
        android:layout_height="@dimen/x20"
        android:src="@mipmap/jia"/>

LinearLayout>

 效果如图所示