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otonyjeffotonyjeff
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update README
Projeto desenvolvido em Java no android studio
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‎Calculadora/.gitignore‎

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*.iml
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.gradle
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/local.properties
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/.idea/caches
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/.idea/libraries
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/.idea/modules.xml
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/.idea/workspace.xml
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/.idea/navEditor.xml
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/.idea/assetWizardSettings.xml
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.DS_Store
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/build
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/captures
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.externalNativeBuild
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.cxx

‎Calculadora/app/.gitignore‎

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/build

‎Calculadora/app/build.gradle‎

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apply plugin: 'com.android.application'
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android {
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compileSdkVersion 30
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buildToolsVersion "30.0.2"
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defaultConfig {
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applicationId "com.calculadora.calculadora"
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minSdkVersion 17
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targetSdkVersion 30
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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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}
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dependencies {
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implementation fileTree(dir: "libs", include: ["*.jar"])
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implementation 'androidx.appcompat:appcompat:1.1.0'
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implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
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testImplementation 'junit:junit:4.12'
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androidTestImplementation 'androidx.test.ext:junit:1.1.1'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
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}

‎Calculadora/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

‎Calculadora/app/src/androidTest/java/com/calculadora/calculadora/ExampleInstrumentedTest.java‎

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package com.calculadora.calculadora;
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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.calculadora.calculadora", appContext.getPackageName());
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}
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}

‎Calculadora/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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package="com.calculadora.calculadora">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".MainActivity">
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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>

‎Calculadora/app/src/main/java/com/calculadora/calculadora/MainActivity.java‎

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package com.calculadora.calculadora;
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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.Button;
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import android.widget.TextView;
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import android.widget.Toast;
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public class MainActivity extends AppCompatActivity {
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Button BtnZero, BtnUm, BtnDois, BtnTres, BtnQuatro,
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BtnCinco, BtnSeis, BtnSete, BtnOito, BtnNove,
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BtnSoma, BtnSubtracao, BtnMultiplicacao, BtnDivisao,
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BtnPonto, BtnIgual, BtnLimpar, BtnApagar;
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TextView display1, display2, display3;
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@Override
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protected void onCreate(Bundle savedInstanceState) { //criação da tela
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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//declarando os botões
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display1 = (TextView) findViewById(R.id.mainDisplay1);
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display2 = (TextView) findViewById(R.id.mainDisplay2);
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display3 = (TextView) findViewById(R.id.mainDisplay3);
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BtnZero = findViewById(R.id.mainBtnZero);
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BtnUm = (Button) findViewById(R.id.mainBtnUm);
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BtnDois = (Button) findViewById(R.id.mainBtnDois);
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BtnTres = (Button) findViewById(R.id.mainBtnTres);
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BtnQuatro = (Button) findViewById(R.id.mainBtnQuatro);
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BtnCinco = (Button) findViewById(R.id.mainBtnCinco);
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BtnSeis = (Button) findViewById(R.id.mainBtnSeis);
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BtnSete = (Button) findViewById(R.id.mainBtnSete);
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BtnOito = (Button) findViewById(R.id.mainBtnOito);
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BtnNove = (Button) findViewById(R.id.mainBtnNove);
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BtnSoma = (Button) findViewById(R.id.mainBtnSoma);
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BtnSubtracao = (Button) findViewById(R.id.mainBtnSubtracao);
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BtnMultiplicacao = (Button) findViewById(R.id.mainBtnMultiplicacao);
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BtnDivisao = (Button) findViewById(R.id.mainBtnDivisao);
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BtnPonto = (Button) findViewById(R.id.mainBtnPonto);
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BtnIgual = (Button) findViewById(R.id.mainBtnIgual);
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BtnApagar = (Button) findViewById(R.id.mainBtnApagar);
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BtnLimpar = (Button) findViewById(R.id.mainBtnLimpar);
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}
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/*-instanciando o click do botão, se for diferente de falso, o botão precionado irá setar o display 1 ou 2(depende de qual display ja esta setado)
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e será mostrado no display o numero que foi clicado nesse caso do 0 até 9 -*/
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boolean bool = false;
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public void BtnZero (View v){
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if (!bool) {
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String strZero = display1.getText().toString();
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display1.setText(strZero + "0");
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} else {
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String strZero = display2.getText().toString();
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display2.setText(strZero + "0");
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}
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}
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public void BtnUm (View v){
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if (!bool) {
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String strUm = display1.getText().toString();
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display1.setText(strUm + "1");
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} else {
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String strUm = display2.getText().toString();
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display2.setText(strUm + "1");
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}
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}
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public void BtnDois (View v){
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if (!bool) {
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String strDois = display1.getText().toString();
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display1.setText(strDois + "2");
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} else {
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String strDois = display2.getText().toString();
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display2.setText(strDois + "2");
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}
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}
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public void BtnTres (View v){
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if (!bool) {
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String strTres = display1.getText().toString();
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display1.setText(strTres + "3");
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} else {
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String strTres = display2.getText().toString();
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display2.setText(strTres + "3");
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}
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}
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public void BtnQuatro (View v){
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if (!bool) {
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String strQuatro = display1.getText().toString();
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display1.setText(strQuatro + "4");
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} else {
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String strQuatro = display2.getText().toString();
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display2.setText(strQuatro + "4");
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}
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}
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public void BtnCinco (View v){
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if (!bool) {
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String strCinco = display1.getText().toString();
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display1.setText(strCinco + "5");
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} else {
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String strCinco = display2.getText().toString();
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display2.setText(strCinco + "5");
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}
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}
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public void BtnSeis (View v){
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if (!bool) {
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String strSeis = display1.getText().toString();
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display1.setText(strSeis + "6");
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} else {
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String strSeis = display2.getText().toString();
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display2.setText(strSeis + "6");
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}
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}
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public void BtnSete (View v){
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if (!bool) {
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String strSete = display1.getText().toString();
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display1.setText(strSete + "7");
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} else {
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String strSete = display2.getText().toString();
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display2.setText(strSete + "7");
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}
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}
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public void BtnOito (View v){
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if (!bool) {
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String strOito = display1.getText().toString();
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display1.setText(strOito + "8");
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} else {
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String strOito = display2.getText().toString();
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display2.setText(strOito + "8");
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}
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}
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public void BtnNove (View v){
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if (!bool) {
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String strNove = display1.getText().toString();
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display1.setText(strNove + "9");
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} else {
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String strNove = display2.getText().toString();
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display2.setText(strNove + "9");
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}
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}
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/*-instanciando o click do botão, caso for verdadeiro o botão é chamado e exibe os operadores matematicos "+,-,*,/" no display3 -*/
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public void BtnSoma (View v){
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bool = true;
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display3.setText("+");
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}
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public void BtnSubtracao (View v){
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bool = true;
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display3.setText("-");
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}
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public void BtnMultiplicacao (View v){
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bool = true;
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display3.setText("x");
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}
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public void BtnDivisao (View v){
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bool = true;
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display3.setText("/");
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}
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/*-instanciando o click do botão PONTO(.) chama a aplicação no display que estiver instanciado display 1 ou 2,
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deixando o usuario colcar somente 1 ponto em cada display e exibe uma mensagem na tela de que o ponto ja foi adicionado-*/
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public void BtnPonto (View v){
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if (!bool) {
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String strPonto = display1.getText().toString();
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if (strPonto.contains(".")) {
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Toast.makeText(MainActivity.this, "Ja existe Ponto", Toast.LENGTH_LONG).show();
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} else {
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String str = display1.getText().toString();
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display1.setText(str + ".");
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}
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} else {
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String strPonto = display2.getText().toString();
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if (strPonto.contains(".")) {
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Toast.makeText(MainActivity.this, "Ja existe Ponto", Toast.LENGTH_LONG).show();
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} else {
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String str = display2.getText().toString();
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display2.setText(str + ".");
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}
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}
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}
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/*-faz a chamada do botão APAGAR no display que está selecionado, ele apaga a string uma a uma até mesmo o ponto adicionado,-*/
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public void BtnApagar (View v){
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if (!bool) {
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String str_display1 = display1.getText().toString();
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if (str_display1.length() > 1) {
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String str_Apagar = str_display1.substring(0, str_display1.length() - 1);
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display1.setText(str_Apagar);
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} else {
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display1.setText("");
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}
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} else {
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String str_display2 = display2.getText().toString();
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if (str_display2.length() > 1) {
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String str_Apagar = str_display2.substring(0, str_display2.length() - 1);
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display2.setText(str_Apagar);
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} else {
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display2.setText("");
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}
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}
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}
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/*-chama o botão que limpa todas as telas displays 1,2 e 3-*/
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public void BtnLimpar (View v){
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bool = false;
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display1.setText("");
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display2.setText("");
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display3.setText("");
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}
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/*- faz a chamada do botão igual que faz o calculo, capturando as strings dos displays 1 e 2 e transformando em inteiros,
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o display 3 e verificado qual operador foi selecionado, por exemplo,
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se foi selecionado o botão de + ele irá capturar os dados em string nos displays 1 e 2
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e converte-los em inteiros, o resultado é exibido em forma de TOAST longo na tela -*/
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public void BtnIgual (View v){
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String str_display1 = display1.getText().toString();
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String str_display2 = display2.getText().toString();
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String str_display3 = display3.getText().toString();
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if (display2.length() > 0) {
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int txt1 = Integer.parseInt(str_display1);
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int txt2 = Integer.parseInt(str_display2);
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if (str_display3.contains("+")) {
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int resultado = txt1 + txt2;
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String str = Integer.toString(resultado);
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Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show();
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} else if (str_display3.contains("-")) {
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int resultado = txt1 - txt2;
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String str = Integer.toString(resultado);
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Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show();
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} else if (str_display3.contains("x")) {
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int resultado = txt1 * txt2;
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String str = Integer.toString(resultado);
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Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show();
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} else if (str_display3.contains("/")) {
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int resultado = txt1 / txt2;
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String str = Integer.toString(resultado);
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Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show();
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} else {
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Toast.makeText(MainActivity.this, "Operação invádida.", Toast.LENGTH_SHORT).show();
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}
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}
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}
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}
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