基本构建;

.idea/dictionaries/Eurus.xml

+<component name="ProjectDictionaryState">
+  <dictionary name="Eurus">
+    <words>
+      <w>inputer</w>
+    </words>
+  </dictionary>
+</component>
\ No newline at end of file

.idea/vcs.xml

@@ -2,6 +2,5 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="$PROJECT_DIR$" vcs="Git" />
-    <mapping directory="$PROJECT_DIR$/TangKuPos" vcs="Git" />
   </component>
 </project>
\ No newline at end of file

app/src/main/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="com.xingdata.zzdpos">
+    package="com.xingdata.zzdpos">
 
-    <uses-permission android:name="android.permission.INTERNET"/>
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
-    <uses-permission android:name="android.permission.SEND_SMS"/>
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.SEND_SMS" />
 
     <application
         android:name=".App"
@@ -19,29 +19,33 @@
             android:configChanges="keyboard|orientation|screenSize|keyboardHidden"
             android:label="@string/main_title"
             android:launchMode="singleTask"
-            android:windowSoftInputMode="adjustUnspecified|stateHidden"/>
+            android:windowSoftInputMode="adjustUnspecified|stateHidden" />
         <activity
             android:name=".ui.splash.SplashActivity"
             android:configChanges="keyboard|orientation|screenSize|keyboardHidden"
             android:theme="@style/AppTheme">
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
 
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <activity
             android:name=".ui.login.LoginActivity"
             android:configChanges="keyboard|orientation|screenSize|keyboardHidden"
-            android:windowSoftInputMode="adjustUnspecified|stateHidden"/>
+            android:windowSoftInputMode="adjustUnspecified|stateHidden" />
         <activity
             android:name=".ui.exception.ErrorDialogActivity"
             android:configChanges="keyboard|orientation|screenSize|keyboardHidden"
-            android:theme="@style/Theme.AppCompat.Light.Dialog"/>
+            android:theme="@style/Theme.AppCompat.Light.Dialog" />
         <activity
             android:name=".ui.exception.ServerErrActivity"
             android:configChanges="keyboard|orientation|screenSize|keyboardHidden"
-            android:theme="@style/Theme.AppCompat.Light.Dialog"/>
+            android:theme="@style/Theme.AppCompat.Light.Dialog" />
+        <activity
+            android:name=".ui.payment.PaymentActivity"
+            android:configChanges="keyboard|orientation|screenSize|keyboardHidden"
+            android:windowSoftInputMode="adjustUnspecified|stateHidden" />
     </application>
 
 </manifest>
\ No newline at end of file

app/src/main/java/com/xingdata/zzdpos/ui/payment/PaymentActivity.java

+package com.xingdata.zzdpos.ui.payment;
+
+import com.xingdata.zzdpos.R;
+import com.xingdata.zzdpos.base.BaseActivity;
+import com.xingdata.zzdpos.databinding.ActivityPaymentBinding;
+
+public class PaymentActivity extends BaseActivity<PaymentPresenter, ActivityPaymentBinding> implements PaymentContract.View {
+
+    @Override
+    public int getLayoutId() {
+        return R.layout.activity_payment;
+    }
+
+    @Override
+    public void initView() {
+    }
+
+}

app/src/main/java/com/xingdata/zzdpos/ui/payment/PaymentContract.java

+package com.xingdata.zzdpos.ui.payment;
+
+import com.xingdata.zzdpos.base.BasePresenter;
+import com.xingdata.zzdpos.base.BaseView;
+
+
+interface PaymentContract {
+
+    interface View extends BaseView {
+    }
+
+    abstract class Presenter extends BasePresenter<PaymentContract.View> {
+    }
+}
\ No newline at end of file

app/src/main/java/com/xingdata/zzdpos/ui/payment/PaymentPresenter.java

+package com.xingdata.zzdpos.ui.payment;
+
+
+public class PaymentPresenter extends PaymentContract.Presenter {
+    @Override
+    public void onAttached() {
+    }
+}

app/src/main/java/com/xingdata/zzdpos/ui/payment/fragment/CalculatorFragment.java

+//package com.xingdata.zzdpos.ui.payment.fragment;
+//
+//import com.xingdata.zzdpos.base.BaseFragment;
+//import com.xingdata.zzdpos.ui.payment.PaymentPresenter;
+//
+///**
+// * Created by Eurus on 2017/12/21.
+// */
+//
+//public class CalculatorFragment extends BaseFragment<PaymentPresenter,> {
+//}

app/src/main/java/com/xingdata/zzdpos/ui/payment/view/CalculatorView.java

+package com.xingdata.zzdpos.ui.payment.view;
+
+
+import android.view.View;
+
+import com.xingdata.zzdpos.R;
+import com.xingdata.zzdpos.base.BaseFragment;
+import com.xingdata.zzdpos.databinding.ViewCalculatorBinding;
+import com.xingdata.zzdpos.ui.payment.PaymentPresenter;
+import com.xingdata.zzdpos.util.ConvertUtil;
+
+import java.math.BigDecimal;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class CalculatorView extends BaseFragment<PaymentPresenter, ViewCalculatorBinding> {
+
+    private String mExp;
+    private OnResultChangeListener mOnResultChangeListener;
+    private onSettleClickListener mOnSettleClickListener;
+
+    public interface OnResultChangeListener {
+        void onResultChange(String exp, Long result);
+    }
+
+    public interface onSettleClickListener {
+        void onSettleClick(Long result);
+    }
+
+    @Override
+    public int getLayoutId() {
+        return R.layout.view_calculator;
+    }
+
+    @Override
+    public void initView() {
+        View.OnClickListener mOnClickListener = view -> {
+            switch (view.getId()) {
+                case R.id.btn_add:
+                    break;
+                case R.id.btn_sub:
+                    break;
+                case R.id.btn_mul:
+                    break;
+                case R.id.btn_div:
+                    break;
+                case R.id.btn_point:
+                    break;
+                case R.id.btn_del:
+                    delete();
+                    break;
+                case R.id.btn_clear:
+                    clear();
+                    break;
+                case R.id.btn_settle:
+                    settle();
+                    break;
+            }
+            if (mOnResultChangeListener != null) {
+                mOnResultChangeListener.onResultChange(mExp, ConvertUtil.yuanToFen(parseExp(mExp)));
+            }
+        };
+        mViewBinding.setOnClick(mOnClickListener);
+
+    }
+
+    /**
+     * 删除
+     */
+    private void delete() {
+        mExp = mExp.substring(0, mExp.length() - 1);
+    }
+
+    /**
+     * 结账
+     */
+    private void settle() {
+        if (mOnSettleClickListener != null) {
+            mOnSettleClickListener.onSettleClick(ConvertUtil.yuanToFen(parseExp(mExp)));
+        }
+    }
+
+    /**
+     * 清空
+     */
+    private void clear() {
+        mExp = "";
+        if (mOnResultChangeListener != null) {
+            mOnResultChangeListener.onResultChange(mExp, ConvertUtil.yuanToFen(parseExp(mExp)));
+        }
+    }
+
+
+    /**
+     * 解析计算四则运算表达式，例：2+((3+4)*2-22)/2*3
+     *
+     * @param exp 算式
+     * @return 结果
+     */
+    public static String parseExp(String exp) {
+        exp = exp.replaceAll("\\s+", "")
+                .replaceAll("^\\((.+)\\)$", "$1")
+                .replaceAll("[\\s+-/*.]+$", "")
+                .replaceAll("×", "*").replaceAll("÷", "/");
+        String minExp = "^((\\d+(\\.\\d+)?)|(\\[-\\d+(\\.\\d+)?]))[+\\-*/]((\\d+(\\.\\d+)?)|(\\[-\\d+(\\.\\d+)?]))$";
+        if (exp.matches(minExp)) {
+            String result = calculate(exp);
+            return Double.parseDouble(result) >= 0 ? result : "[" + result + "]";
+        } else if (exp.matches("[0-9]+")) {
+            return exp;
+        } else if (exp.length() == 0) {
+            return "0";
+        }
+        String noParentheses = "^[^()]+$";
+        String priorOperatorExp = "(((\\d+(\\.\\d+)?)|(\\[-\\d+(\\.\\d+)?]))[*/]((\\d+(\\.\\d+)?)|(\\[-\\d+(\\.\\d+)?])))";
+        String operatorExp = "(((\\d+(\\.\\d+)?)|(\\[-\\d+(\\.\\d+)?]))[+\\-]((\\d+(\\.\\d+)?)|(\\[-\\d+(\\.\\d+)?])))";
+        if (exp.matches(noParentheses)) {
+            Pattern patt = Pattern.compile(priorOperatorExp);
+            Matcher mat = patt.matcher(exp);
+            if (mat.find()) {
+                String tempMinExp = mat.group();
+                exp = exp.replaceFirst(priorOperatorExp, parseExp(tempMinExp));
+            } else {
+                patt = Pattern.compile(operatorExp);
+                mat = patt.matcher(exp);
+
+                if (mat.find()) {
+                    String tempMinExp = mat.group();
+                    exp = exp.replaceFirst(operatorExp, parseExp(tempMinExp));
+                }
+            }
+            return parseExp(exp);
+        }
+        String minParentheses = "\\([^\\(\\)]+\\)";
+        Pattern patt = Pattern.compile(minParentheses);
+        Matcher mat = patt.matcher(exp);
+        if (mat.find()) {
+            String tempMinExp = mat.group();
+            exp = exp.replaceFirst(minParentheses, parseExp(tempMinExp));
+        }
+        System.out.println("expression" + exp);
+        return parseExp(exp);
+    }
+
+    /**
+     * 计算最小单位四则运算表达式（两个数字）
+     *
+     * @param exp 算式
+     * @return 结果
+     */
+    public static String calculate(String exp) {
+        exp = exp.replaceAll("[\\[\\]]", "");
+        String number[] = exp.replaceFirst("(\\d)[+\\-*/]", "$1,").split(",");
+        BigDecimal number1 = new BigDecimal(number[0]);
+        BigDecimal number2 = new BigDecimal(number[1]);
+        BigDecimal result = null;
+        String operator = exp.replaceFirst("^.*\\d([+\\-*/]).+$", "$1");
+        if ("+".equals(operator)) {
+            result = number1.add(number2);
+        } else if ("-".equals(operator)) {
+            result = number1.subtract(number2);
+        } else if ("*".equals(operator)) {
+            result = number1.multiply(number2);
+        } else if ("/".equals(operator)) {
+            result = number1.divide(number2, 2, BigDecimal.ROUND_HALF_UP);
+        }
+        return result != null ? result.toString() : null;
+    }
+
+
+    public void setmOnResultChangeListener(OnResultChangeListener mOnResultChangeListener) {
+        this.mOnResultChangeListener = mOnResultChangeListener;
+    }
+
+    public void setmOnSettleClickListener(onSettleClickListener mOnSettleClickListener) {
+        this.mOnSettleClickListener = mOnSettleClickListener;
+    }
+}

app/src/main/res/layout/activity_payment.xml

+<?xml version="1.0" encoding="utf-8"?>
+<layout>
+
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <Toolbar
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:background="@color/store_product_bg"
+            android:title="收款"
+            android:titleTextColor="@color/white" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="3"
+            android:background="@color/store_product_bg"
+            android:orientation="vertical">
+
+        </LinearLayout>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:background="@color/white"
+            android:gravity="end|center_vertical"
+            android:orientation="horizontal">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="小计:" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="40.00"
+                android:textColor="@color/deep_red" />
+        </LinearLayout>
+
+        <FrameLayout
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="7" />
+
+    </LinearLayout>
+</layout>
\ No newline at end of file

app/src/main/res/values/strings.xml

@@ -463,5 +463,25 @@
     <string name="gift_add_confirm">马上换购</string>
     <string name="gift_sku_price">原价</string>
 
+    <!--输入器-->
+    <string name="inputer_1">1</string>
+    <string name="inputer_2">2</string>
+    <string name="inputer_3">3</string>
+    <string name="inputer_4">4</string>
+    <string name="inputer_5">5</string>
+    <string name="inputer_6">6</string>
+    <string name="inputer_7">7</string>
+    <string name="inputer_8">8</string>
+    <string name="inputer_9">9</string>
+    <string name="inputer_0">0</string>
+    <string name="inputer_point">.</string>
+    <string name="inputer_del">删除</string>
+    <string name="inputer_clear">清空</string>
+    <string name="inputer_settle">收\n款</string>
+    <string name="inputer_add">+</string>
+    <string name="inputer_sub">-</string>
+    <string name="inputer_mul">×</string>
+    <string name="inputer_div">÷</string>
+
 
 </resources>