AutoBundle

AutoBundle generates boilerplate code for field binding with android.os.Bundle.

1. Usage
2. Advanced
3. Example
4. Principle
5. Download
6. Props
7. License

Usage

1. Generate builder method
2. Bind annotated fields
3. Store annotated fields

1. Generate builder method

In your class which has state from Bundle (Activity, BroadcastReceiver, Service, Fragment or others),

declare fields with @AutoBundleField.

Here is example for Activity.

public class MyActivity extends Activity {
    // field with @AutoBundleField, must not be private/protected.
    @AutoBundleField
    String title;

    @AutoBundleField
    int exampleId;

    @AutoBundleField(required = false) // default is true
    int optionalId;
}

After build, {YourClass}AutoBundle class will be generated.

public final class MyActivityAutoBundle {

  // ~~~

  public static final class Builder {
    private final Bundle args;

    public Builder(@NonNull String title, int exampleId) {
      this.args = new Bundle();
      this.args.putString("title", title);
      this.args.putInt("exampleId", exampleId);
    }

    @NonNull
    public MyActivityAutoBundle.Builder optionalId(int optionalId) {
      args.putInt("optionalId", optionalId);
      return this;
    }

    @NonNull
    public Intent build(@NonNull Context context) {
      Intent intent = new Intent(context, MyActivity.class);
      intent.putExtras(args);
      return intent;
    }

    @NonNull
    public Intent build(@NonNull Intent intent) {
      intent.putExtras(args);
      return intent;
    }

    @NonNull
    public Bundle bundle() {
      return args;
    }
  }
}

And you can create intent from builder.

Intent intent = MyActivityAutoBundle.builder("hello, example!", 1)
    .optionalId(2) // here is optional
    .build(context);
// your can also set bundle to other intent
MyActivityAutoBundle.builder("hello, example!", 1)
    .build(otherIntent);

If target class is subclass of these, builder can create intent.

• Activity
• Service
• BroadcastReceiver

Or if target is subclass of android.app.Fragment or androidx.fragment.app.Fragment,

builder can create fragment.

builder = ExampleFragmentAutoBundle.builder("hello, example!", 1)
    .optionalId(2);
ExampleFragment fragment = builder.build();
// you can also set bundle to other fragment
builder.build(otherFragment);

And all builder has bundle(), which returns Bundle.

2. Bind annotated fields

In target class, Call binding method in onCreate.

public class ExampleFragment extends DialogFragment {
    // field with @AutoBundleField, must not be private/protected.
    @AutoBundleField
	String title;

    @AutoBundleField
	int exampleId;

    @AutoBundleField(required = false) // default is true
    int optionalId;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ExampleFragmentAutoBundle.bind(this, getArguments());
		// `AutoBundle` is providing easier interface. 
		// This code is equals to above.
		AutoBundle.bind(this);
    }
}

• bind(Object target, Intent intent)
• bind(Object target, Bundle bundle)
• bind(Activity target) (equals to bind(activity, activity.getIntent()))
• bind(Object target) (equals to bind(fragment, fragment.getArguments()))

3. Store annotated fields

AutoBundle bindings are also useful as restoring value in onSaveInstanceState(Bundle outState).

pack(Object object, Bundle bundle) stores field value to bundle. For example, store in onSaveInstanceState and restore in onCreate.

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    ExampleFragmentAutoBundle.pack(this, outState);
    // or
    AutoBundle.pack(this, outState);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (savedInstanceState != null) {
        // restore
        AutoBundle.bind(this, savedInstanceState);
    } else {
        AutoBundle.bind(this)
    }
}

Advanced

• custom key name
• required
• getter/setter
• converter
• use in library

Set key name

key is key for Bundle. Default is field name. You cannot define duplicate key in one class.

@AutoBundleField(key = "exampleId")
int id;

Required

required option is true by default. If false, Builder class has method which named key name, instead as contructor argument.

@AutoBundleField(required = false)
int optionalId;

then,

ExampleFragment fragment = ExampleFragmentAutoBundle.builder()
        .optionalId(2)
        .build();

Getter/Setter

You can use getter/setter for fields. The method named get/set{key} As a default, But you can specify with @AutoBundleGetter and @AutoBundleSetter.

@AutoBundleField
private String userId;

// get{key} use as default.
// no need for @AutoBundleGetter 
public String getUserId() {
    return userId;
}

@AutoBundleGetter(key = "userId")
public String getId() {
   return userId;
}

@AutoBundleSetter(key = "userId")
public void setId(String id) {
   this.userId = id;
}

CustomConverter

converter option provide custom converter for storing to bundle. You can specify class which implements AutoBundleConverter<T, U>.

public class ExampleFragment extends Fragment {

    @AutoBundleField(converter = DateArgConverter.class)
    Date targetDate;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AutoBundle.bind(this);
    }

    public static class DateArgConverter implements AutoBundleConverter<Date, Long> {

        @Override
        public Long convert(Date o) {
            return o.getTime();
        }

        @Override
        public Date original(Long s) {
            return new Date(s);
        }
     }
}

Use in library module

If you use in library module, you need to pass the custom package for AutoBundleBindingDispatcher, which is generated by processor.

Set autoBundleAsLibrary option as following.

with annotationProcessor (in jack),

android {
    defaultConfig {
        javaCompileOptions {
            annotationProcessorOptions {
                // pachage name as you like
                arguments = [ autoBundleAsLibrary : 'com.yatatsu.example.library' ]
            }
        }
    }
}

You can use library module's binding from app module by subDispatchers option. Pass package name of library's dispatcher. (It maybe your.package.AutoBundleBindingDispatcher!)

annotationProcessorOptions {
    // pass package of library's dispatcher (multi dispatchers with comma)
    arguments = [ subDispatchers : 'com.yatatsu.example.library.AutoBundleBindingDispatcher'
            + ',com.yatatsu.example.library2.AutoBundleBindingDispatcher' ]
}

Example

For more information or usage, see the sample application!

(See example/ and generated codes are under example/build.)

Principle

Both Fragment and Intent are able to pass value by storing Bundle.

There is a good pattern, known as "createIntent" or "newInstance". Static method in called class (e.g. Fragment, Activity) promised the expected data will be passed. AutBundle provide this pattern as builder method instead of "createIntent".

Download

dependencies {
    compile 'com.github.yatatsu.autobundle:autobundle:5.0.2'
    annotationProcessor 'com.github.yatatsu.autobundle:autobundle-processor:5.0.2'
}

Props

• sockeqwe/FragmentArgs
• emilsjolander/IntentBuilder

Actually, AutoBundle is that just integrates above both great libraries.

License

Copyright 2015 KITAGAWA, Tatsuya

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.