Simple Calculator

AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.calculatevariable"
+    android:versionCode="1"
+    android:versionName="1.0" >
+
+    <uses-sdk
+        android:minSdkVersion="8"
+        android:targetSdkVersion="15" />
+
+    <application
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme" >
+        <activity
+            android:name=".CalculateVariable"
+            android:label="@string/title_activity_calculate_variable" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

proguard-project.txt

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+# To enable ProGuard in your project, edit project.properties
+# to define the proguard.config property as described in that file.
+#
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in ${sdk.dir}/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the ProGuard
+# include property in project.properties.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# 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 *;
+#}

project.properties

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+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-16

res/layout/activity_calculate_variable.xml

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+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" >
+
+    <TextView
+        android:id="@+id/lblTitle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentTop="true"
+        android:layout_centerHorizontal="true"
+        android:layout_marginTop="22dp"
+        android:text="@string/lblTitle"
+        android:textAppearance="?android:attr/textAppearanceLarge" />
+
+    <EditText
+        android:id="@+id/editText3"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentRight="true"
+        android:layout_below="@+id/lblTitle"
+        android:layout_marginRight="17dp"
+        android:layout_marginTop="33dp"
+        android:ems="10"
+        android:inputType="numberDecimal" />
+
+    <TextView
+        android:id="@+id/lblValue1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignBottom="@+id/editText3"
+        android:layout_toLeftOf="@+id/editText3"
+        android:text="@string/lblValue1"
+        android:textAppearance="?android:attr/textAppearanceMedium" />
+
+    <EditText
+        android:id="@+id/txtValue2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/editText3"
+        android:layout_marginTop="16dp"
+        android:layout_toRightOf="@+id/lblValue1"
+        android:ems="10"
+        android:inputType="numberDecimal" />
+
+    <TextView
+        android:id="@+id/lblValue2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignBottom="@+id/txtValue2"
+        android:layout_toLeftOf="@+id/txtValue2"
+        android:text="@string/lblValue2"
+        android:textAppearance="?android:attr/textAppearanceMedium" />
+
+    <Button
+        android:id="@+id/btnMinus"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignLeft="@+id/lblValue2"
+        android:layout_below="@+id/lblValue2"
+        android:layout_marginTop="15dp"
+        android:text="@string/btnMinus" />
+
+    <Button
+        android:id="@+id/btnMultiple"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignBaseline="@+id/btnMinus"
+        android:layout_alignBottom="@+id/btnMinus"
+        android:layout_toRightOf="@+id/btnMinus"
+        android:text="@string/btnMultiple" />
+
+    <Button
+        android:id="@+id/btnSum"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignBaseline="@+id/btnMultiple"
+        android:layout_alignBottom="@+id/btnMultiple"
+        android:layout_toRightOf="@+id/btnMultiple"
+        android:text="@string/btnSum" />
+
+    <Button
+        android:id="@+id/btnDivide"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignBaseline="@+id/btnSum"
+        android:layout_alignBottom="@+id/btnSum"
+        android:layout_toRightOf="@+id/btnSum"
+        android:text="@string/btnDivide" />
+
+    <TextView
+        android:id="@+id/lblResult"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignLeft="@+id/btnMinus"
+        android:layout_below="@+id/btnMinus"
+        android:layout_marginTop="29dp"
+        android:text="@string/lblResult"
+        android:textAppearance="?android:attr/textAppearanceMedium" />
+
+    <EditText
+        android:id="@+id/txtResult"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignBaseline="@+id/lblResult"
+        android:layout_alignBottom="@+id/lblResult"
+        android:layout_alignLeft="@+id/txtValue2"
+        android:ems="10"
+        android:inputType="numberDecimal" />
+
+</RelativeLayout>

res/menu/activity_calculate_variable.xml

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+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/menu_settings"
+        android:title="@string/menu_settings"
+        android:orderInCategory="100"
+        android:showAsAction="never" />
+</menu>

res/values-v11/styles.xml

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+<resources>
+
+    <style name="AppTheme" parent="android:Theme.Holo.Light" />
+
+</resources>

res/values-v14/styles.xml

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+<resources>
+
+    <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar" />
+
+</resources>

res/values/strings.xml

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+<resources>
+
+    <string name="app_name">CalculateVariable</string>
+    <string name="hello_world">Hello world!</string>
+    <string name="menu_settings">Settings</string>
+    <string name="title_activity_calculate_variable">Calculate Variable</string>
+    <string name="lblTitle">My Simple Calculateor</string>
+    <string name="lblValue1">Value 1:</string>
+    <string name="lblValue2">Value 2:</string>
+    <string name="lblResult">Result:</string>
+    <string name="btnSum">+</string>
+    <string name="btnMinus">-</string>
+    <string name="btnMultiple">*</string>
+    <string name="btnDivide">/</string>
+
+</resources>

res/values/styles.xml

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+<resources>
+
+    <style name="AppTheme" parent="android:Theme.Light" />
+
+</resources>

src/com/example/calculatevariable/CalculateVariable.java

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+package com.example.calculatevariable;
+
+import android.os.Bundle;
+import android.app.Activity;
+import android.view.Menu;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+
+public class CalculateVariable extends Activity {
+
+	Button btnSum;
+	Button btnMinus;
+	Button btnMultiple;
+	Button btnDivide;
+	EditText txtValue1;
+	EditText txtValue2;
+	EditText txtResult;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_calculate_variable);
+
+        btnSum = (Button) this.findViewById(R.id.btnSum);
+    	btnMinus = (Button) this.findViewById(R.id.btnMinus);
+    	btnMultiple = (Button) this.findViewById(R.id.btnMultiple);
+    	btnDivide = (Button) this.findViewById(R.id.btnDivide);
+    	txtValue1 = (EditText) this.findViewById(R.id.editText3);
+    	txtValue2 = (EditText) this.findViewById(R.id.txtValue2);
+    	txtResult = (EditText) this.findViewById(R.id.txtResult);
+
+        btnSum.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				// TODO Auto-generated method stub
+				double value1 = Double.parseDouble(txtValue1.getText().toString());
+				double value2 = Double.parseDouble(txtValue2.getText().toString());
+				double result = value1 + value2;
+				txtResult.setText(Double.toString(result));
+			}
+		});
+
+
+        btnMinus.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				// TODO Auto-generated method stub
+				double value1 = Double.parseDouble(txtValue1.getText().toString());
+				double value2 = Double.parseDouble(txtValue2.getText().toString());
+				double result = value1 - value2;
+				txtResult.setText(Double.toString(result));
+			}
+		});
+
+
+        btnMultiple.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				// TODO Auto-generated method stub
+				double value1 = Double.parseDouble(txtValue1.getText().toString());
+				double value2 = Double.parseDouble(txtValue2.getText().toString());
+				double result = value1 * value2;
+				txtResult.setText(Double.toString(result));
+			}
+		});
+
+
+        btnDivide.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				// TODO Auto-generated method stub
+				double value1 = Double.parseDouble(txtValue1.getText().toString());
+				double value2 = Double.parseDouble(txtValue2.getText().toString());
+				double result = value1 / value2;
+				txtResult.setText(Double.toString(result));
+			}
+		});
+
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.activity_calculate_variable, menu);
+        return true;
+    }
+}