Android OpensourcesSteven Kim (김우성)

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1. ButterKnife

2. Lombok

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ButterKnife?

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• http://jakewharton.github.io/butterknife/

• using Annotation Processing

• No more findViewById in Activity, View, ListAdapter etc.

• Simplify click listeners

ButterKnife

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ButterKnife - before at activity

class ExampleActivity extends Activity { TextView title; TextView subtitle; TextView footer ; ! @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.simple_activity); title = (TextView) findViewById(R.id.title); subtitle = (TextView) findViewById(R.id.subtitle); footer = (TextView) findViewById(R.id.footer); ! // TODO Use views... } }

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ButterKnife - after BuffetKnife at activity

class ExampleActivity extends Activity {

@InjectView(R.id.title) TextView title;

@InjectView(R.id.subtitle) TextView subtitle;

@InjectView(R.id.footer) TextView footer ;

! @Override public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.simple_activity);

ButterKnife.inject(this);

// TODO Use "injected" views...

}

}

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ButterKnife - after BuffetKnife at view

public class FancyFragment extends Fragment {

@InjectView(R.id.button1) Button button1;

@InjectView(R.id.button2) Button button2; ! @Override View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fancy_fragment, container, false);

ButterKnife.inject(this, view); // TODO Use "injected" views... return view; } }

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static class ViewHolder {

@InjectView(R.id.title) TextView name;

@InjectView(R.id.job_title) TextView jobTitle;

!

public ViewHolder(View view) {

ButterKnife.inject(this, view);

}

}

ButterKnife - after BuffetKnife at list adapter

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ButterKnife - after BuffetKnife at list adapter

public class MyAdapter extends BaseAdapter { @Override public View getView(int position, View view, ViewGroup parent) { ViewHolder holder; view = inflater.inflate(R.layout.whatever, parent, false); ! holder = new ViewHolder(view); ! holder.name.setText("John Doe"); // etc... return convertView; static class ViewHolder { @InjectView(R.id.title) TextView name; @InjectView(R.id.job_title) TextView jobTitle; ! public ViewHolder(View view) { ButterKnife.inject(this, view); } } }

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Lombok ?

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• http://projectlombok.org/

• No more Getter / Setter!

Lombok

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Lombok - before Lombok

public class GetterSetterExample { private int age = 10; private String name; ! public int getAge() { return age; } public void setAge(int age) { this.age = age; } protected void setName(String name) { this.name = name; } }

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Lombok - after Lombok

public class GetterSetterExample {

@Getter @Setter private int age = 10;

@Setter(AccessLevel.PROTECTED) private String name;

}

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To be continued…• Android Annotations - Runtime DI(Dependency Injection)

- http://androidannotations.org/

• Robolectric (2.2+) - Testing - http://robolectric.org/

• Otto - Event handler using bus - http://square.github.io/otto/

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Thank you!

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