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‎app/build.gradle‎

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plugins {
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id 'com.android.application'
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}
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android {
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namespace 'com.example.calc'
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compileSdk 33
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defaultConfig {
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applicationId "com.example.calc"
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minSdk 24
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targetSdk 33
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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}
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_1_8
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targetCompatibility JavaVersion.VERSION_1_8
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}
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}
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dependencies {
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implementation 'androidx.appcompat:appcompat:1.6.1'
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implementation 'com.google.android.material:material:1.9.0'
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implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
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implementation 'com.faendir.rhino:rhino-android:1.5.2'
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testImplementation 'junit:junit:4.13.2'
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androidTestImplementation 'androidx.test.ext:junit:1.1.5'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
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}

‎app/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎app/src/androidTest/java/com/example/calc/ExampleInstrumentedTest.java‎

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package com.example.calc;
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import android.content.Context;
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import androidx.test.platform.app.InstrumentationRegistry;
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import androidx.test.ext.junit.runners.AndroidJUnit4;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import static org.junit.Assert.*;
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
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*/
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@RunWith(AndroidJUnit4.class)
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public class ExampleInstrumentedTest {
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@Test
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public void useAppContext() {
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// Context of the app under test.
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Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
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assertEquals("com.example.calc", appContext.getPackageName());
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}
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}

‎app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools">
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<application
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android:allowBackup="true"
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android:dataExtractionRules="@xml/data_extraction_rules"
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android:fullBackupContent="@xml/backup_rules"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:supportsRtl="true"
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android:theme="@style/Theme.Calc"
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tools:targetApi="31">
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<activity
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android:name=".MainActivity"
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android:exported="true">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎app/src/main/java/com/example/calc/MainActivity.java‎

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package com.example.calc;
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import androidx.appcompat.app.AppCompatActivity;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.TextView;
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import com.google.android.material.button.MaterialButton;
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import org.mozilla.javascript.Context;
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import org.mozilla.javascript.ScriptableObject;
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public class MainActivity extends AppCompatActivity implements View.OnClickListener {
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TextView resultsTv, solutionTv;
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MaterialButton btnAc, btnMult, btnDiv, btnBack, btn7, btn8, btn9, btnPlus, btn4, btn5, btn6, btnSub, btn1, btn2, btn3, btnPer, btnPt, btn0, btn00, btnSol;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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resultsTv = findViewById(R.id.result_tv);
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solutionTv = findViewById(R.id.sol_tv);
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assignId(btnAc, R.id.btnAC);
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assignId(btnMult, R.id.btnMult);
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assignId(btnDiv, R.id.btnDiv);
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assignId(btnBack, R.id.btnBack);
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assignId(btn7, R.id.btn7);
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assignId(btn8, R.id.btn8);
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assignId(btn9, R.id.btn9);
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assignId(btnPlus, R.id.btnPlus);
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assignId(btn4, R.id.btn4);
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assignId(btn5, R.id.btn5);
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assignId(btn6, R.id.btn6);
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assignId(btnSub, R.id.btnSub);
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assignId(btn1, R.id.btn1);
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assignId(btn2, R.id.btn2);
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assignId(btn3, R.id.btn3);
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assignId(btnPer, R.id.btnPer);
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assignId(btnPt, R.id.btnPt);
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assignId(btn0, R.id.btn0);
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assignId(btn00, R.id.btn00);
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assignId(btnSol, R.id.btnSol);
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}
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void assignId(MaterialButton btn, int id){
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btn = findViewById(id);
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btn.setOnClickListener(this);
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}
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@Override
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public void onClick(View view) {
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MaterialButton button = (MaterialButton) view;
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String buttonText = button.getText().toString();
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String datatoCalculate = solutionTv.getText().toString();
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if(buttonText.equals("AC")){
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solutionTv.setText("");
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resultsTv.setText("0");
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return;
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}
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if(buttonText.equals("=")){
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solutionTv.setText(resultsTv.getText());
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return;
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}
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if(buttonText.equals("C")){
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if(datatoCalculate.length() != 0) {
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datatoCalculate = datatoCalculate.substring(0, datatoCalculate.length()-1);
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}
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}else {
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datatoCalculate = datatoCalculate + buttonText;
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}
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if(datatoCalculate.endsWith("/")) {
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datatoCalculate = datatoCalculate.replace("*/", "/");
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datatoCalculate = datatoCalculate.replace("+/", "/");
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datatoCalculate = datatoCalculate.replace("-/", "/");
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datatoCalculate = datatoCalculate.replace("%/", "/");
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} else if(datatoCalculate.endsWith("*")) {
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datatoCalculate = datatoCalculate.replace("/*", "*");
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datatoCalculate = datatoCalculate.replace("+*", "*");
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datatoCalculate = datatoCalculate.replace("-*", "*");
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datatoCalculate = datatoCalculate.replace("%*", "*");
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} else if(datatoCalculate.endsWith("%")) {
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datatoCalculate = datatoCalculate.replace("*%", "%");
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datatoCalculate = datatoCalculate.replace("+%", "%");
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datatoCalculate = datatoCalculate.replace("-%", "%");
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datatoCalculate = datatoCalculate.replace("/%", "%");
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} else if(datatoCalculate.endsWith("+")) {
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datatoCalculate = datatoCalculate.replace("*+", "+");
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datatoCalculate = datatoCalculate.replace("/+", "+");
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datatoCalculate = datatoCalculate.replace("-+", "+");
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datatoCalculate = datatoCalculate.replace("%+", "+");
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} else if(datatoCalculate.endsWith("-")) {
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datatoCalculate = datatoCalculate.replace("*-", "-");
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datatoCalculate = datatoCalculate.replace("+-", "-");
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datatoCalculate = datatoCalculate.replace("/-", "-");
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datatoCalculate = datatoCalculate.replace("%-", "-");
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}
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solutionTv.setText(datatoCalculate);
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String finalResult = getResult(datatoCalculate);
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if(!finalResult.equals("Err")){
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resultsTv.setText(finalResult);
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}
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}
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String getResult(String data) {
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try{
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Context context = Context.enter();
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context.setOptimizationLevel(-1);
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ScriptableObject scriptable = context.initSafeStandardObjects();
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String finalResult = context.evaluateString(scriptable, data, "Javascript", 1, null).toString();
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if(finalResult.endsWith(".0")){
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finalResult = finalResult.replace(".0", "");
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}
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return finalResult;
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}catch (Exception e){
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return "Err";
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}
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}
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}

‎app/src/main/res/drawable-v24/ic_launcher_foreground.xml‎

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<vector xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:aapt="http://schemas.android.com/aapt"
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android:width="108dp"
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android:height="108dp"
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android:viewportWidth="108"
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android:viewportHeight="108">
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<path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
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<aapt:attr name="android:fillColor">
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<gradient
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android:endX="85.84757"
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android:endY="92.4963"
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android:startX="42.9492"
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android:startY="49.59793"
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android:type="linear">
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<item
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android:color="#44000000"
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android:offset="0.0" />
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<item
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android:color="#00000000"
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android:offset="1.0" />
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</gradient>
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</aapt:attr>
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</path>
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<path
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android:fillColor="#FFFFFF"
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android:fillType="nonZero"
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android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
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android:strokeWidth="1"
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android:strokeColor="#00000000" />
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</vector>

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