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:layout_width="wrap_content"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:focusable="true"

android:showDividers="middle">

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

android:id="@+id/add"

android:layout_width="0dp"

android:layout_weight="1"

android:layout_height="match_parent"

android:background="@color/gray"

android:gravity="center"

android:minWidth="30dp"

android:text="+"

android:textColor="@color/write" />

android:id="@+id/count"

android:layout_width="0dp"

android:layout_weight="1"

android:layout_height="match_parent"

android:background="@null"

android:gravity="center"

android:inputType="number"

android:minWidth="40dp"

android:text="1"

android:textColor="@color/gray" />

android:id="@+id/delete"

android:layout_width="0dp"

android:layout_weight="1"

android:layout_height="match_parent"

android:background="@color/gray"

android:gravity="center"

android:minWidth="30dp"

android:text="-"

android:textColor="@color/write" />

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：

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="cn.jhc.startdemo.duty.DutyActivity"

android:orientation="vertical">

android:id="@+id/add_delete"

android:layout_width="300dp"

android:layout_height="40dp"

app:maxCount="5"

app:btnWidth="100dp"

app:editWidth="100dp"

app:isEditCount="false"

app:AddDeleteBackgroungColor="@color/gray"

app:textSize="14dp"/>