Initial commit

.gitignore

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

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        applicationId "com.eurokonverter"
+        minSdk 21
+        targetSdk 30
+        versionCode 1
+        versionName "1.0"
+
+        setProperty("archivesBaseName", "$applicationId-$versionName")
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.gridlayout:gridlayout:1.0.0'
+    implementation "androidx.cardview:cardview:1.0.0"
+
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

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/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.eurokonverter">
+
+    <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/Theme.EuroKonverter">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:screenOrientation="portrait"
+            >
+            <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/eurokonverter/MainActivity.java

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+package com.eurokonverter;
+
+import android.graphics.Color;
+import android.os.Bundle;
+import android.text.Selection;
+import android.view.View;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.eurokonverter.util.CustomScrollingMovementMethod;
+
+import java.util.Locale;
+
+/**
+ *
+ */
+public class MainActivity extends AppCompatActivity {
+
+    private final double CONVERSION_RATE = 7.53450;
+
+    private LinearLayout selectedView;
+    private TextView     inputView;
+    private TextView     outputView;
+
+    /**
+     *
+     * @param textView
+     */
+    private void scrollToEnd(TextView textView) {
+
+        textView.append("");
+        Selection.setSelection(textView.getEditableText(), textView.length());
+    }
+
+    /**
+     *
+     */
+    private void setInputViewScrolling(int id) {
+
+        LinearLayout view = findViewById(id);
+        if (view == null) {
+            return;
+        }
+
+        TextView inputView = (TextView) view.getChildAt(view.getChildCount() - 1);
+        if (inputView == null) {
+            return;
+        }
+
+        inputView.setMovementMethod(new CustomScrollingMovementMethod(this));
+        scrollToEnd(inputView);
+    }
+    /**
+     *
+     * @param layoutId
+     */
+    private void setSelectedView(int layoutId) {
+
+        LinearLayout hrk = findViewById(R.id.linearLayoutHRK);
+        LinearLayout eur = findViewById(R.id.linearLayoutEUR);
+
+        if (hrk == null || eur == null) {
+            return;
+        }
+
+        if (layoutId == R.id.linearLayoutHRK) {
+            eur.setBackgroundColor(Color.TRANSPARENT);
+            hrk.setBackgroundColor(getResources().getColor(R.color.design_default_color_secondary));
+
+            inputView    = (TextView) hrk.getChildAt(hrk.getChildCount() - 1);
+            outputView   = (TextView) eur.getChildAt(eur.getChildCount() - 1);
+            selectedView = hrk;
+        } else {
+            hrk.setBackgroundColor(Color.TRANSPARENT);
+            eur.setBackgroundColor(getResources().getColor(R.color.design_default_color_secondary));
+
+            inputView    = (TextView) eur.getChildAt(eur.getChildCount() - 1);
+            outputView   = (TextView) hrk.getChildAt(hrk.getChildCount() - 1);
+            selectedView = eur;
+        }
+    }
+
+    /**
+     *
+     * @param textView
+     * @return
+     */
+    private double getDouble(TextView textView) {
+
+        String string = textView.getText().toString().replaceAll("\\.", "").replaceAll(",", ".");
+        return Double.parseDouble(string);
+    }
+
+    /**
+     *
+     * @param textView
+     * @param value
+     */
+    private void setDouble(TextView textView, double value) {
+
+        if (value == 0) {
+            textView.setText("0");
+            return;
+        }
+
+        textView.setText(String.format(Locale.GERMANY, "%,.2f", value));
+    }
+
+    /**
+     *
+     * @param textView
+     * @param value
+     */
+    private void setDoubleNoDecimals(TextView textView, double value) {
+
+        if (value == 0) {
+            textView.setText("0");
+            return;
+        }
+
+        String string = String.format(Locale.GERMANY, "%,.2f", value);
+
+        while (string.endsWith("0")) {
+            string = string.substring(0, string.length() - 1);
+        }
+
+        if (string.endsWith(",")) {
+            string = string.substring(0, string.length() - 1);
+        }
+
+        textView.setText(string);
+    }
+
+    /**
+     *
+     */
+    private void convert() {
+
+        double value = getDouble(inputView);
+        if (selectedView.getId() == R.id.linearLayoutHRK) {
+            value /= CONVERSION_RATE;
+        } else {
+            value *= CONVERSION_RATE;
+        }
+
+        setDouble(outputView, value);
+        scrollToEnd(outputView);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        setInputViewScrolling(R.id.linearLayoutHRK);
+        setInputViewScrolling(R.id.linearLayoutEUR);
+
+        setSelectedView(R.id.linearLayoutHRK);
+    }
+
+    /**
+     *
+     * @param view
+     */
+    public void onCurrencySelected(View view) {
+        setSelectedView(view.getId());
+    }
+
+    /**
+     *
+     * @param view
+     */
+    public void onKeyPressed(View view) {
+
+        if (selectedView == null || inputView == null) {
+            return;
+        }
+
+        char key = ((Button) view).getText().toString().charAt(0);
+        if (key == 'C') {
+            inputView.setText("0");
+        } else if (key == 8592) {
+
+            int length = inputView.length();
+            if (length > 1) {
+                inputView.setText(inputView.getText().subSequence(0, length - 1));
+            } else {
+                inputView.setText("0");
+            }
+        } else if (key == ',') {
+            if (!inputView.getText().toString().contains(",")) {
+                inputView.append("" + key);
+            }
+        } else {
+
+            String text = inputView.getText().toString();
+            if (text.contains(",") && text.indexOf(',') == text.length() - 3) {
+                return;
+            }
+
+            if (inputView.length() == 1 && text.charAt(0) == '0') {
+                inputView.setText("" + key);
+            } else {
+                inputView.append("" + key);
+            }
+        }
+
+        if (!inputView.getText().toString().contains(",")) {
+            setDoubleNoDecimals(inputView, getDouble(inputView));
+        }
+
+        scrollToEnd(inputView);
+        convert();
+    }
+}

app/src/main/java/com/eurokonverter/util/CustomScrollingMovementMethod.java

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+package com.eurokonverter.util;
+
+import android.text.Spannable;
+import android.text.method.ScrollingMovementMethod;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.TextView;
+
+import com.eurokonverter.MainActivity;
+
+/**
+ *
+ */
+public class CustomScrollingMovementMethod extends ScrollingMovementMethod {
+
+    private       TextView        textView;
+    private final GestureDetector gestureDetector;
+
+    /**
+     *
+     * @param activity
+     */
+    public CustomScrollingMovementMethod(MainActivity activity) {
+
+        gestureDetector = new GestureDetector(activity, new GestureDetector.SimpleOnGestureListener() {
+            @Override
+            public boolean onSingleTapUp(MotionEvent e) {
+                activity.onCurrencySelected((View) textView.getParent());
+                return super.onSingleTapUp(e);
+            }
+        });
+    }
+
+    @Override
+    public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
+
+        textView = widget;
+        gestureDetector.onTouchEvent(event);
+        return super.onTouchEvent(widget, buffer, event);
+    }
+}