首先我们需要的是         加(botton)        减 (botton)      输入数量(editText)    【这里我还设置了最大值】

然后对 加减按钮设置监听，点击对editText的内容进行修改。

布局代码：

    
    
         //android:showDividers="middle"在每个子View间加入分隔线    
         
         
     
    

再写我们需要在调用这个自定义View的时候设置它的属性【res  ->   values  ->   attrs.xml】写入

最后我们写自定义的LinearLayout，代码如下：

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Color;import android.support.annotation.Nullable;import android.text.Editable;import android.text.TextWatcher;import android.util.AttributeSet;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.EditText;import android.widget.LinearLayout;import android.widget.TextView;import cn.jhc.startdemo.R;/** * Created by Administrator on 2017/10/14. */public class AddDeleteCount extends LinearLayout implements View.OnClickListener, TextWatcher {    private int max, btnWidth, edtWidth, addOrDeleteBg;    private EditText edt_count;    //edit控件是否可以修改    private boolean IsEdtCountEdited = false;    public AddDeleteCount(Context context) {        this(context, null);    }    public AddDeleteCount(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        LayoutInflater.from(context).inflate(R.layout.add_or_delete, this);        TextView add = findViewById(R.id.add);        add.setOnClickListener(this);        TextView delete = findViewById(R.id.delete);        delete.setOnClickListener(this);        edt_count = findViewById(R.id.count);        edt_count.addTextChangedListener(this);        if (attrs != null) {            TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.AddDeleteCount);            max = array.getInt(R.styleable.AddDeleteCount_maxCount, -1);            btnWidth = array.getDimensionPixelOffset(R.styleable.AddDeleteCount_btnWidth, 100);            edtWidth = array.getDimensionPixelOffset(R.styleable.AddDeleteCount_editWidth, 80);            addOrDeleteBg = array.getColor(R.styleable.AddDeleteCount_AddDeleteBackgroungColor, Color.GRAY);            IsEdtCountEdited = array.getBoolean(R.styleable.AddDeleteCount_isEditCount, false);            array.recycle();        }        edt_count.setEnabled(IsEdtCountEdited);        LayoutParams params = new LayoutParams(btnWidth, ViewGroup.LayoutParams.MATCH_PARENT);        add.setLayoutParams(params);        delete.setLayoutParams(params);        LayoutParams params1 = new LayoutParams(edtWidth, ViewGroup.LayoutParams.MATCH_PARENT);        edt_count.setLayoutParams(params1);        add.setBackgroundColor(addOrDeleteBg);        delete.setBackgroundColor(addOrDeleteBg);    }    @Override    public void onClick(View view) {        int currentCount = Integer.parseInt(edt_count.getText().toString());        switch (view.getId()) {            case R.id.add:                if (currentCount < max) {                    edt_count.setText(String.valueOf(currentCount + 1));                }                break;            case R.id.delete:                if (currentCount > 1) {                    edt_count.setText(String.valueOf(currentCount - 1));                }                break;        }    }    @Override    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {    }    @Override    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {    }    @Override    public void afterTextChanged(Editable editable) {        if (edt_count.getText().toString().isEmpty()) {            return;        } else {            if (Integer.parseInt(edt_count.getText().toString()) > max) {                edt_count.setText(String.valueOf(max));            }        }    }    public void setEdtCountEdited(boolean edtCountEdited) {        edt_count.setEnabled(edtCountEdited);    }    public int getCount() {        if (!edt_count.getText().toString().isEmpty()) {            return Integer.parseInt(edt_count.getText().toString());        }        return 1;    }}

最后在MainActivity布局中调用：