From f6e7aebbd9a7185b3c45f2734636090c0efd2b2b Mon Sep 17 00:00:00 2001
From: Grzegorz Adam Hankiewicz <gradha@imap.cc>
Date: Sat, 8 Sep 2012 22:08:45 +0200
Subject: [PATCH] Adds interactive user interface for android.

---
 .../android/res/layout/cross_calculator.xml   | 72 +++++++++++++++++++
 .../crosscalculator/CrossCalculator.java      | 54 +++++++++++---
 2 files changed, 116 insertions(+), 10 deletions(-)
 create mode 100644 examples/cross_calculator/android/res/layout/cross_calculator.xml

diff --git a/examples/cross_calculator/android/res/layout/cross_calculator.xml b/examples/cross_calculator/android/res/layout/cross_calculator.xml
new file mode 100644
index 0000000000..11531334c5
--- /dev/null
+++ b/examples/cross_calculator/android/res/layout/cross_calculator.xml
@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/RelativeLayout1"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/title"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentTop="true"
+        android:layout_centerHorizontal="true"
+        android:text="Crossplatform Nimrod calculator"
+        android:textSize="20dip" >
+
+    </TextView>
+
+    <TextView
+        android:id="@+id/value_a"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/title"
+        android:text="Value A: " >
+    </TextView>
+
+    <EditText
+        android:id="@+id/edit_text_a"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentRight="true"
+        android:layout_below="@+id/title"
+        android:ems="10"
+        android:inputType="number" />
+
+    <TextView
+        android:id="@+id/value_b"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/edit_text_a"
+        android:text="Value B: " >
+    </TextView>
+
+    <EditText
+        android:id="@+id/edit_text_b"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentRight="true"
+        android:layout_below="@+id/edit_text_a"
+        android:ems="10"
+        android:inputType="number" />
+
+    <Button
+        android:id="@+id/add_button"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:layout_alignParentLeft="true"
+        android:layout_below="@+id/edit_text_b"
+        android:scrollbarAlwaysDrawVerticalTrack="false"
+        android:selectAllOnFocus="false"
+        android:text="Add!"
+        android:visibility="visible" />
+
+    <TextView
+        android:id="@+id/result_text"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:layout_alignParentLeft="true"
+        android:layout_below="@+id/add_button" />
+
+</RelativeLayout>
diff --git a/examples/cross_calculator/android/src/com/github/nimrod/crosscalculator/CrossCalculator.java b/examples/cross_calculator/android/src/com/github/nimrod/crosscalculator/CrossCalculator.java
index 22a4b9d0c7..df2eed5ea2 100644
--- a/examples/cross_calculator/android/src/com/github/nimrod/crosscalculator/CrossCalculator.java
+++ b/examples/cross_calculator/android/src/com/github/nimrod/crosscalculator/CrossCalculator.java
@@ -1,27 +1,61 @@
 package com.github.nimrod.crosscalculator;
 
 import android.app.Activity;
-import android.widget.TextView;
 import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+import android.widget.Toast;
 
 public class CrossCalculator extends Activity
 {
+	private static final String TAG = "CrossCalculator";
+	private TextView result_text;
+	private EditText edit_text_a, edit_text_b;
 	/** Called when the activity is first created. */
 	@Override
 	public void onCreate(Bundle savedInstanceState)
 	{
 		super.onCreate(savedInstanceState);
+		setContentView(R.layout.cross_calculator);
 
-		/* Create a TextView and set its content.
-		 * the text is retrieved by calling a native
-		 * function.
-		 */
-		TextView  tv = new TextView(this);
-		final int a = 4;
-		final int b = 18;
+		final Button button = (Button)findViewById(R.id.add_button);
+		button.setOnClickListener(new View.OnClickListener() {
+			public void onClick(View v) { addButtonClicked(); } });
+
+		result_text = (TextView)findViewById(R.id.result_text);
+		edit_text_a = (EditText)findViewById(R.id.edit_text_a);
+		edit_text_b = (EditText)findViewById(R.id.edit_text_b);
+	}
+
+	/** Handles clicks on the addition button.
+	 * Reads the values form the input fields and performs the calculation.
+	 */
+	private void addButtonClicked()
+	{
+		int a = 0, b = 0;
+		String errors = "";
+		final String a_text = edit_text_a.getText().toString();
+		final String b_text = edit_text_b.getText().toString();
+		try {
+			a = Integer.valueOf(a_text, 10);
+		} catch (NumberFormatException e) {
+			errors += "Can't parse a value '" + a_text + "'. ";
+		}
+		try {
+			b = Integer.valueOf(b_text, 10);
+		} catch (NumberFormatException e) {
+			errors += "Can't parse b value '" + b_text + "'";
+		}
 		final int c = myAdd(a, b);
-		tv.setText("myAdd(" + a + ", " + b + ") = " + c);
-		setContentView(tv);
+		result_text.setText("myAdd(" + a + ", " + b + ") = " + c);
+
+		if (errors.length() > 0) {
+			Log.e(TAG, errors);
+			Toast.makeText(this, errors, Toast.LENGTH_SHORT).show();
+		}
 	}
 
 	/* A native method that is implemented by the