Source link: https://github.com/vanniktech/OnActivityResult

OnActivityResult

Generates boilerplate code for OnActivityResult callbacks and lets you focus on what matters.
Generated code is fully traceable and debuggable.
Everything is generated during compile time with appropriate errors / warnings.
No reflection used!

Gradle

buildscript {

  dependencies {

classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
  
}
 
}
  apply plugin: 'com.neenbedankt.android-apt'  dependencies {

  compile 'com.vanniktech:onactivityresult:0.6.0'
  apt 'com.vanniktech:onactivityresult-compiler:0.6.0' 
}

Snapshots

compile 'com.vanniktech:onactivityresult:0.7.0-SNAPSHOT' apt 'com.vanniktech:onactivityresult-compiler:0.7.0-SNAPSHOT'

Modules are located on Maven Central.

Example

Override onActivityResult in your Activity / Fragment and call ActivityResult.onResult

@Override protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {

  super.onActivityResult(requestCode, resultCode, data);

ActivityResult.onResult(requestCode, resultCode, data).into(this);
 
}

Annotate your methods and get the callback

@OnActivityResult(requestCode = 33) void onActivityResultTestActivity() {
 /* Do something */ 
}
  @OnActivityResult(requestCode = 1, resultCodes = {
 Activity.RESULT_OK 
}
) void onActivityResultActivityOk() {
 /* Only do something when ok */ 
}
  @OnActivityResult(requestCode = 1, resultCodes = {
 Activity.RESULT_CANCELED 
}
) void onActivityResultActivityCanceled() {
 /* Only do something when canceled */ 
}
  @OnActivityResult(requestCode = 2) void onActivityResultPickImage(final int resultCode, final Intent intent) {
 /* Do something */ 
}

Various parameters are supported:

none
int
Intent
int, Intent
Intent, int

Where int parameters will get the resultCode and Intent parameters will get the Intent.

Note: Each annotated method shall only have one int and / or Intent variable.

In addition to that other parameter annotations are supported like:

@IntentData Uri uri
@Extra type var
@ExtraBoolean boolean booleanVar
@ExtraByte byte byteVar
@ExtraChar char charVar
@ExtraDouble double doubleVar
@ExtraFloat float floatVar
@ExtraInt int intVar
@ExtraLong long longVar
@ExtraShort short shortVar
@ExtraString String stringVar

Some examples can be found here.

The @Extra annotation is generic and works with every type mentioned above. In addition it also supports custom types which are implementing Parcelable or Serializable.

The disadvantage of @Extra is that it won't let you specify a default value therefore the other annotations do exist and should be used when needed.

Advantages over AfterMath

Gives you compile error(s) when using invalid RequestCode
Annotated method does not require resultCode and Intent to be present. It'll work with every combination (no params, resultCode, Intent, resultCode & Intent, Intent & resultCode). In addition also all custom parameter annotations can be used.
The annotations are on mavenCentral and available as a separate artifact
More detailed error messages
Inheritance support
@IntentData annotation with @NonNull & @Nullable support.
Specify resultCodes with e.g. resultCodes = { Activity.RESULT_OK }.
@Extra, @ExtraBoolean, @ExtraByte, @ExtraChar, @ExtraDouble, @ExtraFloat, @ExtraInt, @ExtraLong, @ExtraShort, @ExtraString annotations.