Android RoboGuice - Let’s slim down the code

Usage of RoboGuice library:

• Views Injection:: To initialize views, use @InjectViews, for example: @InjectView(R.id.textView1) TextView textView1;
• Resources Injection: To initialize and get resources, use @InjectResources, for example: @InjectResource(R.string.app_name) String name;
• System services Injection: To initialize and access system services, use @Inject, for example: @Inject LayoutInflater inflater;
• POJO object Injection: To inject and initialize POJO object, use @Inject, for example: @Inject Foo foo;

General Activity :




public class TestActivity extends Activity{

    TextView textView1;

    TextView textView2;

    ImageView imageView1;

    String name;

    Drawable icLauncher;

    LocationManager locManager;

    LayoutInflater inflater;

    NotificationManager notifyManager;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        setContentView(R.layout.layout_test);

        textView1 = (TextView) findViewById(R.id.textView1);

        textView2 = (TextView) findViewById(R.id.textView2);

        imageView1 = (ImageView) findViewById(R.id.imageView1);

        name = getString(R.string.app_name);

        icLauncher = getResources().getDrawable(R.id.ic_launcher);

        locManager = (LocationManager) getSystemService(Activity.LOCATION_SERVICE);

        inflater = (LayoutInflater) getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

        notifyManager = (NotificationManager) getSystemService(Activity.NOTIFICATION_SERVICE);

        textView1.setText("Hello World! RoboGuice demo");

    }

}

Let’s check the magic of RoboGuice and let’s slim down the code.

public class TestActivity extends RoboActivity{

        @InjectView(R.id.textView1) TextView textView1;

        @InjectView(R.id.textView2) TextView textView2;

        @InjectView(R.id.imageView1) ImageView imageView1;

        @InjectResource(R.string.app_name) String name;

        @InjectResource(R.drawable.ic_launcher) Drawable icLauncher;

        @Inject LocationManager locManager;

        @Inject LayoutInflater inflater;

        @Inject NotificationManager notifyManager;

       @Override        protected void onCreate(Bundle savedInstanceState) {

              // TODO Auto-generated method stub 

              super.onCreate(savedInstanceState); 

              setContentView(R.layout.layout_test); 

              textView1.setText(name); 

            } 

}

Installation
To use RoboGuice, you need to download following JAR files and add them to your claspath:

http://repo1.maven.org/maven2/org/roboguice/roboguice/2.0/roboguice-2.0.jar

http://repo1.maven.org/maven2/com/google/inject/guice/3.0/guice-3.0-no_aop.jar

http://repo1.maven.org/maven2/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar