Kaffeine
Kaffeine is a Kotlin-flavored Android library for accelerating development.
Several Words of Caution
Besides the obvious productivity advantages, if you are using this project - be prepared to shoot yourself in the foot or to blow your legs off. This is an experimental project that I am working on while I learn Kotlin and functional programming. Some of the lucrative approaches used in this project may not be best practices and I don't have any guarantees over the API. Don't be surprised if the API changes for every SNAPSHOT. If you are trending along a safe path, this project is definitely not for you. I may highlight caveats in some of the approaches if I am smart enough to figure them out. But, feel free to throw some light if you spot some dumbness (or a lot) along the lane.
Activities & Services
Example: Start an Activity
Java
Intent intent = new Intent(this, SuperPowersActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
Kotlin
val flags = flags(Intent.FLAG_ACTIVITY_NEW_TASK, Intent.FLAG_ACTIVITY_CLEAR_TOP) startActivity<SuperPowersActivity>(flags)Layout Inflation
Java
LayoutInflater layoutInflater = LayoutInflater.from(this);
View awesomeView = layoutInflater.inflate(R.layout.my_awesome_layout, null);
Kotlin
val awesomeView = inflateLayout(R.layout.my_awesome_layout)Logs
Example: Logging
Java
String tag = this.getClass().getName();
Log.i(tag, "Howdy! Info");
Log.d(tag, "Knock knock! Debug");
Log.e(tag, "Grim, Error");
Log.wtf(tag, "Damn! WTF");
// Nope, not what you think. Refer the docs :PKotlin
i("Howdy! Info") d("Knock knock! Debug") e("Grim, Error") wtf("Damn! WTF")Preferences
Example: Single Preference
Java
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
Editor editor = preferences.edit();
editor.putBoolean("KEY_WALKTHROUGH_COMPLETE", complete);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD) {
editor.commit();
}
else {
editor.apply();
}
Kotlin
getDefaultSharedPreferences().putBoolean("KEY_WALKTHROUGH_COMPLETE", complete)Example: Bulk Preferences
Kotlin
getDefaultSharedPreferences()
.bulk()
.putBoolean("KEY_WALKTHROUGH_COMPLETE", complete)
.putString("KEY_LAST_USED", lastUsedIso8601Date)
.applyBulk()Toasts
Example: Short Message
Java
Toast.makeText(this, R.string.welcome, Toast.LENGTH_SHORT).show();
Kotlin
showShortToast(R.string.welcome)Example: Custom Toast
Java
Toast toast = new Toast(this);
toast.setView(view);
toast.setDuration(Toast.LENGTH_LONG);
toast.show();
Kotlin
showShortToast(view)System Services
Java
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Kotlin
val alarmManager = context.alarmManager() val notificationManager = context.notificationManager()Resources
Example: Typeface from Assets
Java
AssetManager assetManager = getAssets();
Typeface sourceSansPro = Typeface.createFromAsset(assetManager, "fonts/source-sans-pro.ttf");
Kotlin
val sourceSansPro = typefaceFromAssets("fonts/source-sans-pro.ttf")More...
More extensions under development.
Maven
<dependency>
<groupId>com.mobsandgeeks</groupId>
<artifactId>kaffeine</artifactId>
<version>0.1-SNAPSHOT</version> </dependency> Gradle
dependencies {
compile 'com.mobsandgeeks:kaffeine:0.1-SNAPSHOT'
}
Snapshots
In your {
project_base
}
/build.gradle file, include the following.
allprojects {
repositories {
mavenCentral()
maven {
url "https://oss.sonatype.org/content/repositories/snapshots/"
}
}
}
License
Copyright 2015 Mobs & Geeks Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.