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guFalcon committed Jan 3, 2024
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@media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}}
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<body class="article toc2 toc-left">
<div id="header">
Expand Down Expand Up @@ -547,7 +661,7 @@ <h3 id="_wie_funktioniert_android"><a class="anchor" href="#_wie_funktioniert_an
<p>Stellt Hardware-Abstraktionen zur Verfügung. Jede App hat Zugriff auf die Hardware, aber nur über die API.</p>
</li>
<li>
<p>Foundateion. Kümmert sich um threading, low-level memory management, etc&#8230;&#8203;</p>
<p>Foundation. Kümmert sich um threading, low-level memory management, etc&#8230;&#8203;</p>
</li>
</ol>
</div>
Expand Down Expand Up @@ -618,15 +732,15 @@ <h4 id="_null_safety"><a class="anchor" href="#_null_safety"></a>3.2.1. Null Saf
</div>
<div class="listingblock">
<div class="content">
<pre>val number: Int</pre>
<pre class="rouge highlight"><code data-lang="kotlin"><span class="kd">val</span> <span class="py">number</span><span class="p">:</span> <span class="nc">Int</span></code></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>
<pre class="rouge highlight"><code data-lang="kotlin"><span class="kd">val</span> <span class="py">number</span><span class="p">:</span> <span class="nc">Int</span><span class="p">?</span> <span class="p">=</span> <span class="k">null</span></code></pre>
</div>
</div></div></td>
</tr>
Expand Down Expand Up @@ -656,13 +770,13 @@ <h4 id="_extension_functions"><a class="anchor" href="#_extension_functions"></a
</div>
<div class="listingblock">
<div class="content">
<pre>fun String.removeFirstLastChar(): String = this.substring(1, this.length - 1)
<pre class="rouge highlight"><code data-lang="kotlin"><span class="k">fun</span> <span class="nc">String</span><span class="p">.</span><span class="nf">removeFirstLastChar</span><span class="p">():</span> <span class="nc">String</span> <span class="p">=</span> <span class="k">this</span><span class="p">.</span><span class="nf">substring</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="k">this</span><span class="p">.</span><span class="n">length</span> <span class="p">-</span> <span class="mi">1</span><span class="p">)</span>

fun main(args: Array&lt;String&gt;) {
val myString= "Hello Everyone"
val result = myString.removeFirstLastChar()
println("First character is: $result")
}</pre>
<span class="k">fun</span> <span class="nf">main</span><span class="p">(</span><span class="n">args</span><span class="p">:</span> <span class="nc">Array</span><span class="p">&lt;</span><span class="nc">String</span><span class="p">&gt;)</span> <span class="p">{</span>
<span class="kd">val</span> <span class="py">myString</span><span class="p">=</span> <span class="s">"Hello Everyone"</span>
<span class="kd">val</span> <span class="py">result</span> <span class="p">=</span> <span class="n">myString</span><span class="p">.</span><span class="nf">removeFirstLastChar</span><span class="p">()</span>
<span class="nf">println</span><span class="p">(</span><span class="s">"First character is: $result"</span><span class="p">)</span>
<span class="p">}</span></code></pre>
</div>
</div></div></td>
</tr>
Expand Down Expand Up @@ -739,18 +853,19 @@ <h4 id="_coroutines"><a class="anchor" href="#_coroutines"></a>3.2.4. Coroutines
</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>
<pre class="rouge highlight"><code data-lang="kotlin"><span class="k">fun</span> <span class="nf">main</span><span class="p">()</span> <span class="p">=</span> <span class="nf">runBlocking</span> <span class="p">{</span> <span class="c1">// this: CoroutineScope</span>
<span class="nf">launch</span> <span class="p">{</span> <span class="c1">// launch a new coroutine and continue</span>
<span class="nf">delay</span><span class="p">(</span><span class="mi">1000L</span><span class="p">)</span> <span class="c1">// non-blocking delay for 1 second</span>
<span class="nf">println</span><span class="p">(</span><span class="s">"World!"</span><span class="p">)</span> <span class="c1">// print after delay</span>
<span class="p">}</span>
<span class="nf">println</span><span class="p">(</span><span class="s">"Hello"</span><span class="p">)</span> <span class="c1">// main coroutine continues</span>
<span class="p">}</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Output:
Hello
World!</p>
</div></div></td>
</tr>
</tbody>
Expand Down Expand Up @@ -881,17 +996,17 @@ <h4 id="_higher_order_funcs_und_lambdas"><a class="anchor" href="#_higher_order_
</div>
<div class="listingblock">
<div class="content">
<pre>max(strings, { a, b -&gt; a.length &lt; b.length })
<pre class="rouge highlight"><code data-lang="kotlin"><span class="nf">max</span><span class="p">(</span><span class="n">strings</span><span class="p">,</span> <span class="p">{</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="p">-&gt;</span> <span class="n">a</span><span class="p">.</span><span class="n">length</span> <span class="p">&lt;</span> <span class="n">b</span><span class="p">.</span><span class="n">length</span> <span class="p">})</span>

/**
<span class="cm">/**
The function max is a higher-order function,
as it takes a function value as its second argument.
This second argument is an expression that is itself a function,
called a function literal,
which is equivalent to the following named function:
**/
**/</span>

fun compare(a: String, b: String): Boolean = a.length &lt; b.length</pre>
<span class="k">fun</span> <span class="nf">compare</span><span class="p">(</span><span class="n">a</span><span class="p">:</span> <span class="nc">String</span><span class="p">,</span> <span class="n">b</span><span class="p">:</span> <span class="nc">String</span><span class="p">):</span> <span class="nc">Boolean</span> <span class="p">=</span> <span class="n">a</span><span class="p">.</span><span class="n">length</span> <span class="p">&lt;</span> <span class="n">b</span><span class="p">.</span><span class="n">length</span></code></pre>
</div>
</div></div></td>
</tr>
Expand Down Expand Up @@ -1084,7 +1199,7 @@ <h4 id="_neues_projekt_anlegen"><a class="anchor" href="#_neues_projekt_anlegen"
Alternativ kannst Du auch auf File und dann New Project klicken.</p>
</li>
<li>
<p>Klicke auf "Empty Compose Activity" und klicke dann auf Next.</p>
<p>Klicke auf "Empty Activity" und klicke dann auf Next. (Compose ist inzwischen Standard)</p>
</li>
</ol>
</div>
Expand All @@ -1096,7 +1211,8 @@ <h4 id="_neues_projekt_anlegen"><a class="anchor" href="#_neues_projekt_anlegen"
Für dieses Kapitel nennen wir unser Projekt 'Android Community' und lassen die anderen Einstellung in Ruhe.
Die Sprache ist per Voreinstellung auf Kotlin.
Minimum SDK ist API 21: Android 5.0 (Lollipop). Das ist die minimale Version von Android, auf der unsere App laufen können wird.
In diesem Fall wird unser Projekt auf ca. 98.8% aller Android-Geräte laufen können.</p>
In diesem Fall wird unser Projekt auf ca. 98.8% aller Android-Geräte laufen können.
Die Einstellungen im Bild unten, wie der Name und das Package, sind nur Beispiele. Du kannst Deine eigenen Werte eingeben oder es einfach so lassen, wie es voreingestellt ist.</p>
</div>
<div class="paragraph">
<p><span class="image"><img src="images/android-1-9.png" alt="android 1 9" width="100%"></span></p>
Expand All @@ -1118,21 +1234,21 @@ <h4 id="_neues_projekt_anlegen"><a class="anchor" href="#_neues_projekt_anlegen"
</div>
<div class="listingblock">
<div class="content">
<pre>class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState:Bundle?) {
super.onCreate(savedInstanceState)
setContent {
AndroidCommunityTheme {
Surface(
modifier = Modifier.fillMaxSize(),
color = MaterialTheme.colors.background
) {
Greeting("Hello, Android Community")
}
}
}
}
}</pre>
<pre class="rouge highlight"><code data-lang="kotlin"><span class="kd">class</span> <span class="nc">MainActivity</span> <span class="p">:</span> <span class="nc">ComponentActivity</span><span class="p">()</span> <span class="p">{</span>
<span class="k">override</span> <span class="k">fun</span> <span class="nf">onCreate</span><span class="p">(</span><span class="n">savedInstanceState</span><span class="p">:</span><span class="nc">Bundle</span><span class="p">?)</span> <span class="p">{</span>
<span class="k">super</span><span class="p">.</span><span class="nf">onCreate</span><span class="p">(</span><span class="n">savedInstanceState</span><span class="p">)</span>
<span class="nf">setContent</span> <span class="p">{</span>
<span class="nc">AndroidCommunityTheme</span> <span class="p">{</span>
<span class="nc">Surface</span><span class="p">(</span>
<span class="n">modifier</span> <span class="p">=</span> <span class="nc">Modifier</span><span class="p">.</span><span class="nf">fillMaxSize</span><span class="p">(),</span>
<span class="n">color</span> <span class="p">=</span> <span class="nc">MaterialTheme</span><span class="p">.</span><span class="n">colors</span><span class="p">.</span><span class="n">background</span>
<span class="p">)</span> <span class="p">{</span>
<span class="nc">Greeting</span><span class="p">(</span><span class="s">"Hello, Android Community"</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span></code></pre>
</div>
</div>
</div>
Expand Down Expand Up @@ -1198,7 +1314,7 @@ <h2 id="_deine_app_mit_gradlew_laufen_lassen"><a class="anchor" href="#_deine_ap
</div>
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<div id="footer-text">
Last updated 2023-11-06 14:27:52 UTC
Last updated 2024-01-03 21:56:27 UTC
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