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A Lifecycle components aware BroadcastReceiver DSL (Kotlin)
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import android.content.Context | |
import android.content.Intent | |
import android.content.IntentFilter | |
import androidx.lifecycle.Lifecycle.Event.ON_DESTROY | |
import androidx.lifecycle.Lifecycle.Event.ON_START | |
import androidx.lifecycle.LifecycleObserver | |
import androidx.lifecycle.LifecycleOwner | |
import androidx.lifecycle.OnLifecycleEvent | |
import android.content.BroadcastReceiver as StockReceiver | |
/** @author Aidan Follestad (@afollestad) */ | |
class BroadcastReceiver<T>( | |
context: T, | |
constructor: Builder.() -> Unit | |
) : LifecycleObserver where T : Context, T : LifecycleOwner { | |
private val appContext = context.applicationContext | |
private val filter: IntentFilter | |
private val instructions: List<Instructions> | |
init { | |
val builder = Builder() | |
constructor(builder) | |
filter = builder.filter() | |
instructions = builder.instructions() | |
context.lifecycle.addObserver(this) | |
} | |
private val broadcastReceiver = object : StockReceiver() { | |
override fun onReceive( | |
context: Context, | |
intent: Intent | |
) { | |
for (ins in instructions) { | |
if (ins.matches(intent)) { | |
ins.execution() | |
.invoke(intent) | |
break | |
} | |
} | |
} | |
} | |
@OnLifecycleEvent(ON_START) | |
fun start() { | |
appContext.registerReceiver(broadcastReceiver, filter) | |
} | |
@OnLifecycleEvent(ON_DESTROY) | |
fun stop() = appContext.unregisterReceiver(broadcastReceiver) | |
} |
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import android.content.IntentFilter | |
/** @author Aidan Follestad (@afollestad) */ | |
class Builder internal constructor() { | |
private val filter = IntentFilter() | |
private val instructions = mutableListOf<Instructions>() | |
fun onAction( | |
action: String, | |
execution: Execution | |
) { | |
filter.addAction(action) | |
instructions.add(OnAction(action, execution)) | |
} | |
fun onDataScheme( | |
scheme: String, | |
execution: Execution | |
) { | |
filter.addDataScheme(scheme) | |
instructions.add(OnDataScheme(scheme, execution)) | |
} | |
fun onCategory( | |
category: String, | |
execution: Execution | |
) { | |
filter.addCategory(category) | |
instructions.add(OnCategory(category, execution)) | |
} | |
internal fun filter() = filter | |
internal fun instructions() = instructions | |
} |
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import android.content.Intent | |
typealias Execution = (Intent) -> Unit | |
/** @author Aidan Follestad (@afollestad) */ | |
sealed class Instructions { | |
abstract fun matches(intent: Intent): Boolean | |
abstract fun execution(): Execution | |
data class OnAction( | |
val action: String, | |
val execution: Execution | |
) : Instructions() { | |
override fun matches(intent: Intent): Boolean { | |
return intent.action == action | |
} | |
override fun execution() = execution | |
} | |
data class OnDataScheme( | |
val scheme: String, | |
val execution: Execution | |
) : Instructions() { | |
override fun matches(intent: Intent): Boolean { | |
return intent.data?.scheme == scheme | |
} | |
override fun execution() = execution | |
} | |
data class OnCategory( | |
val category: String, | |
val execution: Execution | |
) : Instructions() { | |
override fun matches(intent: Intent): Boolean { | |
return intent.hasCategory(category) | |
} | |
override fun execution() = execution | |
} | |
} |
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class MyActivity : AppCompatActivity() { | |
override fun onCreate(savedInstanceState: Bundle?) { | |
super.onCreate(savedInstanceState) | |
// Will automatically unregister itself when the Activity pauses, and register again when it resumes. | |
BroadcastReceiver(this) { | |
onAction("com.yourapp.helloworld.SOME_ACTION") { | |
// Do something | |
} | |
onCategory("messages") { | |
// Do something | |
} | |
onDataScheme("file://") { | |
// Do something | |
} | |
} | |
} | |
} |
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