android - voltear - programa para rotar imagenes

Cómo girar un icono de Android en su punto central?

Question

He escrito lo siguiente para girar mi ícono en el centro de la pantalla y en su lugar gira alrededor de la esquina superior izquierda (es decir, origen x = 0, y = 0 de ImageView). Debería ser simple establecer algunos atributos de ImageView o RotateAnimation, pero no puedo resolverlo.

public class IconPromoActivity extends Activity {
    private static final float ROTATE_FROM = 0.0f;
    private static final float ROTATE_TO = -10.0f * 360.0f;// 3.141592654f * 32.0f;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

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

        RotateAnimation r; // = new RotateAnimation(ROTATE_FROM, ROTATE_TO);
        r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, 0, 0, 40, 0);
        r.setDuration((long) 2*1500);
        r.setRepeatCount(0);
        favicon.startAnimation(r);
    }
}

Answer 1

Aquí está el ejemplo completo

public class MainActivity extends AppCompatActivity implements MainActivityMvpModel {
    ImageView imageViewThumb;

    private static final float ROTATE_FROM = 30.0f;
    private static final float ROTATE_TO = 360.0f;
    RotateAnimation r; // = new RotateAnimation(ROTATE_FROM, ROTATE_TO);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        buttonTest= (Button) findViewById(R.id.button_test);

        imageViewThumb= (ImageView) findViewById(R.id.icon_thumb);
        imageViewThumb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
                r.setDuration((long) 2*500);
                r.setRepeatCount(0);
                imageViewThumb.startAnimation(r);

                imageViewThumb.setColorFilter(R.color.colorThumbPressed);
            }
        });
    }
}

Answer 2

Esto funciona para mí:

img = (ImageView)findViewById(R.id.ImageView01);
RotateAnimation rotateAnimation = new RotateAnimation(30, 90,
    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);

Answer 3

Pruebe: r = new RotateAnimation(ROTATE_FROM, ROTATE_TO, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);