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https://github.com/annimon/android-java-8-stream-example
Demo app of using Java 8 features with Retrolambda and Lightweight-Stream-API
https://github.com/annimon/android-java-8-stream-example
android demo java-8 retrolambda stream-api
Last synced: 4 months ago
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Demo app of using Java 8 features with Retrolambda and Lightweight-Stream-API
- Host: GitHub
- URL: https://github.com/annimon/android-java-8-stream-example
- Owner: aNNiMON
- Created: 2015-01-09T10:23:12.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2017-06-05T10:25:59.000Z (over 7 years ago)
- Last Synced: 2024-09-29T23:04:46.287Z (4 months ago)
- Topics: android, demo, java-8, retrolambda, stream-api
- Language: Java
- Homepage:
- Size: 166 KB
- Stars: 114
- Watchers: 8
- Forks: 25
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Android Java 8 Stream API Example
Demo app of using Java 8 features with [Retrolambda](https://github.com/orfjackal/retrolambda) and [Lightweight-Stream-API](https://github.com/aNNiMON/Lightweight-Stream-API).
Features:
- [() -> lambda expression](app/src/main/java/com/annimon/java8streamexample/MainActivity.java#L49-L54)
```java
findViewById(R.id.go).setOnClickListener(v -> {
final int index = mActionSpinner.getSelectedItemPosition();
if (index != Spinner.INVALID_POSITION) {
action(actions[index]);
}
});
```
- [Method::references](app/src/main/java/com/annimon/java8streamexample/Word.java#L37)
```java
int cmp = Objects.compare(word, other.word, String::compareToIgnoreCase);
```
- [Stream.API()](app/src/main/java/com/annimon/java8streamexample/Utils.java#L37-L41)
```java
return Stream.of(lines)
.map(str -> str.split("\t"))
.filter(arr -> arr.length == 2)
.map(arr -> new Word(arr[0], arr[1]))
.collect(Collectors.toList());
```
- [switch for "string"](app/src/main/java/com/annimon/java8streamexample/MainActivity.java#L85)
```java
switch (action) {
case "filter 1":
// Filter one word
stream = stream.filter(p -> p.getWord().split(" ").length == 1);
break;
case "filter 2+":
// Filter two and more words
stream = stream.filter(p -> p.getWord().split(" ").length >= 2);
break;
// ...
}
```
- [try(with-resources) {}](app/src/main/java/com/annimon/java8streamexample/Utils.java#L28)
```java
final List lines = new ArrayList<>();
try (final InputStream is = context.getAssets().open("words.txt");
final InputStreamReader isr = new InputStreamReader(is, "UTF-8");
final BufferedReader reader = new BufferedReader(isr)) {
String line;
while ( (line = reader.readLine()) != null ) {
lines.add(line);
}
}
```
- [Objects](app/src/main/java/com/annimon/java8streamexample/Word.java#L48) (from Java 7)
```java
@Override
public boolean equals(Object o) {
// ...
final Word other = (Word) o;
return Objects.equals(translate, other.translate) &&
Objects.equals(word, other.word);
}
@Override
public int hashCode() {
return Objects.hash(word, translate);
}
```
- ~~try {~~ [Exceptional](app/src/main/java/com/annimon/java8streamexample/Utils.java#L26-L43) ~~} catch~~ (functional try/catch)
```java
return Exceptional.of(() -> {
final InputStream is = context.getAssets().open("words.txt");
// ... operations which throws Exception ...
return lines;
}).ifException(e -> Log.e("Java 8 Example", "Utils.readWords", e))
.getOrElse(new ArrayList<>());
```
## Links
Demo app: [Java8StreamExample.apk](http://annimon.com/ablogs/file325/Java8StreamExample.apk)
Blog (Russian): [Java 8 в Android со Stream API и лямбдами](http://annimon.com/article/1176)
Retrolambda: https://github.com/orfjackal/retrolambda
Lightweight-Stream-API: https://github.com/aNNiMON/Lightweight-Stream-API
## Screenshots
 