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@guFalcon
guFalcon committed Oct 16, 2023
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329 changes: 326 additions & 3 deletions android-1.html
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Expand Up @@ -449,7 +449,13 @@ <h1>Android - Course - 1 - Introduction</h1>
</ul>
</li>
<li><a href="#_android_studio_ide">2. Android Studio IDE</a></li>
<li><a href="#_kotlin_grundzüge">3. Kotlin Grundzüge</a></li>
<li><a href="#_kotlin_grundzüge">3. Kotlin Grundzüge</a>
<ul class="sectlevel2">
<li><a href="#_kotlin">3.1. Kotlin</a></li>
<li><a href="#_java_vs_kotlin">3.2. Java vs. Kotlin</a></li>
<li><a href="#_übung">3.3. Übung</a></li>
</ul>
</li>
<li><a href="#_komponenten_einer_android_app">4. Komponenten einer Android-App</a></li>
<li><a href="#_mein_erster_knopf_in_jetpack_compose">5. Mein erster Knopf in Jetpack-Compose</a></li>
<li><a href="#_android_project_structure">6. Android Project Structure</a></li>
Expand Down Expand Up @@ -534,13 +540,330 @@ <h3 id="_wie_funktioniert_android"><a class="anchor" href="#_wie_funktioniert_an
<div class="sect1">
<h2 id="_android_studio_ide"><a class="anchor" href="#_android_studio_ide"></a>2. Android Studio IDE</h2>
<div class="sectionbody">

<div class="paragraph">
<p>Installation unter: <a href="https://developer.android.com/studio/install">https://developer.android.com/studio/install</a></p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
Hausübung:
Installieren und auf die neueste Version updaten.
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_kotlin_grundzüge"><a class="anchor" href="#_kotlin_grundzüge"></a>3. Kotlin Grundzüge</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_kotlin"><a class="anchor" href="#_kotlin"></a>3.1. Kotlin</h3>
<div class="paragraph">
<p><span class="image"><img src="images/android-1-3.png" alt="android 1 3" width="100%"></span></p>
</div>
<div class="paragraph">
<p>Seit 2019 ist Kotlin die bevorzugte Programmiersprache für Android-Apps bei Google
Seitdem ist die Sprache sehr populär geworden</p>
</div>
</div>
<div class="sect2">
<h3 id="_java_vs_kotlin"><a class="anchor" href="#_java_vs_kotlin"></a>3.2. Java vs. Kotlin</h3>
<div class="sect3">
<h4 id="_null_safety"><a class="anchor" href="#_null_safety"></a>3.2.1. Null Safety</h4>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Java</th>
<th class="tableblock halign-left valign-top">Kotlin</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Jedes Objekt ist null by default</p>
</div>
<div class="listingblock">
<div class="content">
<pre>public Integer number;</pre>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Kein Objekt kann null werden</p>
</div>
<div class="listingblock">
<div class="content">
<pre>val number: Int</pre>
</div>
</div>
<div class="paragraph">
<p>&#8230;&#8203;außer man gibt es so an:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>val number: Int? = null</pre>
</div>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect3">
<h4 id="_extension_functions"><a class="anchor" href="#_extension_functions"></a>3.2.2. Extension Functions</h4>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Java</th>
<th class="tableblock halign-left valign-top">Kotlin</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Ohne Erweiterung (z.B. Project Lombok) nicht verfügbar. (Ev. noch über Vererbung&#8230;&#8203; Aber nicht jedes zu erweiternde Projekt gehört auch euch.)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Standardmäßig in die Sprache eingebaut. Einfach den Funktionsnamen in jedem beliebigen File mit dem jeweiligen Klassennamen prefixen.</p>
</div>
<div class="listingblock">
<div class="content">
<pre>fun String.removeFirstLastChar(): String = this.substring(1, this.length - 1)

fun main(args: Array&lt;String&gt;) {
val myString= "Hello Everyone"
val result = myString.removeFirstLastChar()
println("First character is: $result")
}</pre>
</div>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect3">
<h4 id="_code"><a class="anchor" href="#_code"></a>3.2.3. Code</h4>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">Java</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Kotlin</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="ulist">
<ul>
<li>
<p>Eher ausführlich (getter, setter).</p>
</li>
<li>
<p>Gibts schon länger als so manches modernes Sprachkonstrukt (z.B. async).</p>
</li>
</ul>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="ulist">
<ul>
<li>
<p>Sehr kompakt.</p>
</li>
<li>
<p>Weniger Lines Of Code.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>&#8658; Besser zu erstellen, lesen und zu warten.</p>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect3">
<h4 id="_coroutines"><a class="anchor" href="#_coroutines"></a>3.2.4. Coroutines</h4>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Java</th>
<th class="tableblock halign-left valign-top">Kotlin</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Background Threads. (z.B.: ExecutorService)</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="ulist">
<ul>
<li>
<p>Eigener Threadpool</p>
</li>
<li>
<p>In Sprache fix eingebaut</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre>fun main() = runBlocking { // this: CoroutineScope
launch { // launch a new coroutine and continue
delay(1000L) // non-blocking delay for 1 second
println("World!") // print after delay
}
println("Hello") // main coroutine continues
}

Output:
Hello
World!</pre>
</div>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect3">
<h4 id="_data_classes"><a class="anchor" href="#_data_classes"></a>3.2.5. Data Classes</h4>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Java</th>
<th class="tableblock halign-left valign-top">Kotlin</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="ulist">
<ul>
<li>
<p>Händisch (viel Code oder generiert)</p>
</li>
<li>
<p>Durch Verwendung von Project Lombok</p>
</li>
</ul>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="ulist">
<ul>
<li>
<p>Ein eingebautes Sprachkonstrukt</p>
</li>
<li>
<p>Getter, Setter, HashCode(), Equals(), toString()&#8230;&#8203; werden automatisch implementiert.</p>
</li>
</ul>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect3">
<h4 id="_smart_casts"><a class="anchor" href="#_smart_casts"></a>3.2.6. Smart Casts</h4>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Java</th>
<th class="tableblock halign-left valign-top">Kotlin</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>Entwickler muss die Typen überprüfen und angeben.</p>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="ulist">
<ul>
<li>
<p>Casting Checks werden automatisch durchgeführt (smart casts feature).</p>
</li>
<li>
<p>Redundante Checks werden entfernt.</p>
</li>
</ul>
</div></div></td>
</tr>
</tbody>
</table>
</div>
<div class="sect3">
<h4 id="_title"><a class="anchor" href="#_title"></a>3.2.7. title</h4>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Java</th>
<th class="tableblock halign-left valign-top">Kotlin</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>blah</p>
</div>
<div class="listingblock">
<div class="content">
<pre>code</pre>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p>blah</p>
</div>
<div class="listingblock">
<div class="content">
<pre>code</pre>
</div>
</div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_übung"><a class="anchor" href="#_übung"></a>3.3. Übung</h3>
<div class="paragraph">
<p>Spielwiese unter: <a href="https://play.kotlinlang.org/koans/overview">https://play.kotlinlang.org/koans/overview</a></p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
Hausübung: Alle Aufgaben auf dieser Seite links durchmachen.
</td>
</tr>
</table>
</div>
</div>
</div>
</div>
<div class="sect1">
Expand Down Expand Up @@ -570,7 +893,7 @@ <h2 id="_deine_app_mit_gradlew_laufen_lassen"><a class="anchor" href="#_deine_ap
</div>
<div id="footer">
<div id="footer-text">
Last updated 2023-10-16 12:13:26 UTC
Last updated 2023-10-16 13:22:17 UTC
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</body>
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Expand Up @@ -508,7 +508,7 @@ <h2 id="_android_3"><a class="anchor" href="#_android_3"></a>3. Android - 3</h2>
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<div id="footer-text">
Last updated 2023-10-16 12:13:26 UTC
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Expand Up @@ -444,7 +444,7 @@ <h1>New File</h1>
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Last updated 2023-10-16 12:13:26 UTC
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Expand Up @@ -465,7 +465,7 @@ <h2 id="_android_course"><a class="anchor" href="#_android_course"></a>1. Androi
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Expand Up @@ -444,7 +444,7 @@ <h1>Some Page</h1>
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