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Inline Activity Result

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Table of Contents

  1. Core
    1. Gradle Dependency
    2. Usage
  2. Coroutines
    1. Gradle Dependency
    2. Usage
  3. RxJava
    1. Gradle Dependency
    2. Usage

Core

Gradle Dependency

Core 

dependencies {
  ...
  implementation 'com.afollestad.inline-activity-result:core:0.2.0'
}

Usage

You call startActivityForResult, providing the Activity to launch as the generic type. You receive the result in a callback without having to override onActivityResult. And, you don't have to worry about requestCode or resultCode.

class NewActivity : AppCompatActivity() {

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    val extras = Bundle()
        .putString("some_extra", "Hello, World!")

    startActivityForResult<OtherActivity>(extras) { success, data ->
      if (success) {
        toast("Got successful result: $data")
      }
    }
  }
}

There are multiple variants startActivityForResult you can use for different use cases. All of them allow you to pass an optional requestCode parameter, but this should generally be unnecessary.

First, the simplest you can get is just a generic type and the callback.

startActivityForResult<OtherActivity> { success, data ->
    // Do something
}

Second, you can provide a Bundle of extras to the destination Activity:

val extras = Bundle()
    .putString("some_extra", "Hello, World!")
startActivityForResult<OtherActivity>(extras) { success, data ->
    // Do something
}

And finally, you can use a full intent. In this variant you do not provide a generic parameter.

val intent = Intent(Intent.ACTION_VIEW)
    .setData("content://some-uri".toUri())
startActivityForResult(intent) { success, data ->
  // Do something
}

Coroutines

Gradle Dependency

Coroutines 

dependencies {
  ...
  implementation 'com.afollestad.inline-activity-result:coroutines:0.2.0'
}

Usage

You can use Kotlin coroutines to get rid of the callback. It of course is a suspend function so it must be called within a coroutine scope.

Instead of startActivityForResult, you can use startActivityAwaitResult:

val result: ActivityResult = startActivityAwaitResult<OtherActivity>()
// use result...

RxJava

Gradle Dependency

RxJava 

dependencies {
  ...
  implementation 'com.afollestad.inline-activity-result:rxjava:0.2.0'
}

Usage

You can use RxJava to integrate the Activity launch and result into your streams.

Instead of startActivityForResult, you can use startActivityEmitResult:

val disposable = startActivityEmitResult<OtherActivity>()
  .subscribe { result ->
     // use result...
  }

// make sure you dispose of the subscription when your Activity/Fragment goes away
disposable.dispose()