first commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches/build_file_checksums.ser
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "com.example.a25726.calculator"
+        minSdkVersion 21
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

app/proguard-rules.pro

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

app/src/androidTest/java/com/example/a25726/calculator/ExampleInstrumentedTest.java

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+package com.example.a25726.calculator;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.example.a25726.calculator", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.a25726.calculator">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/example/a25726/calculator/MainActivity.java

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+package com.example.a25726.calculator;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.text.method.ScrollingMovementMethod;
+import android.view.Gravity;
+import android.view.View;
+import android.widget.TextView;
+
+public class MainActivity extends AppCompatActivity implements View.OnClickListener {
+
+    private TextView tv_view;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        tv_view = findViewById(R.id.tv_view);
+        tv_view.setGravity(Gravity.RIGHT|Gravity.BOTTOM);
+        tv_view.setLines(2);
+        tv_view.setMaxLines(1);
+        tv_view.setMovementMethod(new ScrollingMovementMethod());
+
+        findViewById(R.id.bt_0).setOnClickListener(this);
+        findViewById(R.id.bt_1).setOnClickListener(this);
+        findViewById(R.id.bt_2).setOnClickListener(this);
+        findViewById(R.id.bt_3).setOnClickListener(this);
+        findViewById(R.id.bt_4).setOnClickListener(this);
+        findViewById(R.id.bt_5).setOnClickListener(this);
+        findViewById(R.id.bt_6).setOnClickListener(this);
+        findViewById(R.id.bt_7).setOnClickListener(this);
+        findViewById(R.id.bt_8).setOnClickListener(this);
+        findViewById(R.id.bt_9).setOnClickListener(this);
+        findViewById(R.id.bt_add).setOnClickListener(this);
+        findViewById(R.id.bt_subtraction).setOnClickListener(this);
+        findViewById(R.id.bt_multiplication).setOnClickListener(this);
+        findViewById(R.id.bt_divide).setOnClickListener(this);
+        findViewById(R.id.bt_sqrt).setOnClickListener(this);
+        findViewById(R.id.bt__).setOnClickListener(this);
+        findViewById(R.id.bt_equ).setOnClickListener(this);
+        findViewById(R.id.bt_c).setOnClickListener(this);
+        findViewById(R.id.bt_ce).setOnClickListener(this);
+    }
+    public String[] str={"0","1","2","3","4","5","6","7","8","9","+","-","*","/","√",".","="};
+
+    @Override
+    public void onClick(View v){
+
+        String inf = tv_view.getText().toString();
+        switch (v.getId()){
+            case R.id.bt_0:
+                {
+                    String newStr = String.format("%s%s",inf,str[0]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_1:
+                {
+                    String newStr = String.format("%s%s",inf,str[1]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_2:
+                {
+                    String newStr = String.format("%s%s",inf,str[2]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_3:
+                {
+                    String newStr = String.format("%s%s",inf,str[3]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_4:
+                {
+                    String newStr = String.format("%s%s",inf,str[4]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_5:
+                {
+                    String newStr = String.format("%s%s",inf,str[5]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_6:
+                {
+                    String newStr = String.format("%s%s",inf,str[6]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_7:
+                {
+                    String newStr = String.format("%s%s",inf,str[7]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_8:
+                {
+                    String newStr = String.format("%s%s",inf,str[8]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_9:
+                {
+                    String newStr = String.format("%s%s",inf,str[9]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_add:
+                {
+                    String newStr = String.format("%s%s",inf,str[10]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_subtraction:
+                {
+                    String newStr = String.format("%s%s",inf,str[11]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_multiplication:
+                {
+                    String newStr = String.format("%s%s",inf,str[12]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_divide:
+                {
+                    String newStr = String.format("%s%s",inf,str[13]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_sqrt:
+                {
+                    String newStr = String.format("%s%s",inf,str[14]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt__:
+                {
+                    String newStr = String.format("%s%s",inf,str[15]);
+                    tv_view.setText(newStr);
+                    break;
+                }
+            case R.id.bt_equ:
+                {
+                    break;
+                }
+            case R.id.bt_c:
+                {
+                    if(inf.length()!=0){
+                        String newStr = inf.substring(0,inf.length()-1);
+                        tv_view.setText(newStr);
+                    }
+                    break;
+                }
+            case R.id.bt_ce:
+                {
+                    tv_view.setText("");
+                    break;
+                }
+        }
+    }
+}