Problem

public class MyFragment extends Fragment {

    private static final String EXTRA_TEXT = "arg_text";
    private static final String EXTRA_DATA = "arg_data";

    public static MyFragment newInstance(String text, MyData data) {
        MyFragment frag = new MyFragment();
        Bundle args = new Bundle();
        args.putString(EXTRA_TEXT, text);
        args.putParcelable(EXTRA_DATA, data);
        frag.setArguments(args);
        return frag;
    }

    private String mText;
    private MyData mData;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mText = getArguments().getString(EXTRA_TEXT);
        mData = (MyData) getArguments().getParcelable(EXTRA_DATA);
    }
}

new Fragment

• only default constructor
• passing data through Bundles

public class MyActivity extends Activity {

    private static final String EXTRA_TEXT = "extra_text";
    private static final String EXTRA_DATA = "arg_data";

    public static Intent newIntent(Contaxt context, String text, MyData data) {
        Intent intent = new Intent(context, MyActivity.class);
        intent.putExtra(EXTRA_TEXT, text);
        intent.putExtra(EXTRA_DATA, data);
        return intent;
    }

    private String mText;
    private MyData mData;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle extras = getIntent().getExtras();
        mText = extras.getString(EXTRA_TEXT);
        mData = (MyData) extras.getParcelable(EXTRA_DATA);
    }
}

new Activity

• cannot use constructors
• passing data through Intents

public class MyActivity extends Activity {

    private static final String EXTRA_TEXT = "extra_text";
    private static final String EXTRA_DATA = "arg_data";

    private String mText;
    private MyData mData;

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putParcelable(EXTRA_DATA, mData);
        outState.putString(EXTRA_TEXT, mText);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mData = savedInstanceState.getParcelable(EXTRA_DATA);
        mText = (MyData) savedInstanceState.getString(EXTRA_TEXT);
    }   

}

View State

•  just too much code :)

and more...

Solution?

• Generates boilerplate code based on used annotations and lets you focus on what matters.
• Generated code is fully traceable.
• Everything is generated during compile time.
• No reflection used!

Available annotations:

• @Arg
• @Extra
• @State

public class MyFragment extends Fragment {

    private static final String EXTRA_TEXT = "arg_text";
    private static final String EXTRA_DATA = "arg_data";

    public static MyFragment newInstance(String text, MyData data) {
        MyFragment frag = new MyFragment();
        Bundle args = new Bundle();
        args.putString(EXTRA_TEXT, text);
        args.putParcelable(EXTRA_DATA, data);
        frag.setArguments(args);
        return frag;
    }

    private String mText;
    private MyData mData;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mText = getArguments().getString(EXTRA_TEXT);
        mData = (MyData) getArguments().getParcelable(EXTRA_DATA);
    }
}

new Fragment

• generates class blade.F
• 1 method for each Fragment with @Arg:
  • X newX(T1 arg1, ...])

public class MyActivity extends Activity {

    private static final String EXTRA_TEXT = "extra_text";
    private static final String EXTRA_DATA = "arg_data";

    public static Intent newIntent(Contaxt context, String text, MyData data) {
        Intent intent = new Intent(context, MyActivity.class);
        intent.putExtra(EXTRA_TEXT, text);
        intent.putExtra(EXTRA_DATA, data);
        return intent;
    }

    private String mText;
    private MyData mData;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle extras = getIntent().getExtras();
        mText = extras.getString(EXTRA_TEXT);
        mData = (MyData) extras.getParcelable(EXTRA_DATA);
    }
}

new Activity or Service

• generates class blade.I
• 2 methods for each Activity with @Extra:
  • Intent forX(Context c[, T extra, ...])
  • void startX(Context c[, T extra, ...])

public class MyActivity extends Activity {

    private static final String EXTRA_TEXT = "extra_text";
    private static final String EXTRA_DATA = "arg_data";

    private String mText;
    private MyData mData;

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putParcelable(EXTRA_DATA, mData);
        outState.putString(EXTRA_TEXT, mText);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        mData = savedInstanceState.getParcelable(EXTRA_DATA);
        mText = (MyData) savedInstanceState.getString(EXTRA_TEXT);
    }   

}

View State

• automatically managed: Fragment, Activity, View

@Blade
public class MyActivity extends Activity {
    // no attributes with @Extra
}

@Blade

• Generates methods even if class doesn't contain @Arg/@Extra

Usage

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.0'
        // Add Blade plugin
        classpath 'eu.f3rog.blade:plugin:1.2.0'
    }
}

apply plugin: 'com.android.application'
// Apply Blade plugin
apply plugin: 'blade'

Gradle Plugin