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);