Tuesday, 2 April 2013

Circular Menu Part-1

Main Activity


public class TestMenuActivity extends Activity {
CircleView cView;

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

int numberOfElements = 11;
View[] elems = new View[numberOfElements];

EditText tv = new EditText(this);
tv.setText("Some text");
tv.setLayoutParams(new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT));
elems[0] = tv;

for (int i = 1; i < numberOfElements - 1; i++) {
Button newButton = new Button(this);
newButton.setText("Button   " + i);
newButton.setLayoutParams(new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT));
elems[i] = newButton;
}

Spinner sp = new Spinner(this);
sp.setLayoutParams(new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT));
elems[numberOfElements - 1] = sp;

cView = new CircleView(this, 115, elems);
setContentView(cView);
}
}


How To Create Circle View (Dynamically...)


public class CircleView extends RelativeLayout {
static final int centerId = 111;
private final int radius;

private RelativeLayout.LayoutParams createNewRelativeLayoutParams() {
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.ABOVE, centerId);
lp.addRule(RIGHT_OF, centerId);
return lp;
}

private View prepareElementForCircle(View elem, int distX, int distY) {
RelativeLayout.LayoutParams lp = createNewRelativeLayoutParams();

elem.measure(0, 0);
int deltaX = elem.getMeasuredWidth() / 2;
int deltaY = elem.getMeasuredHeight() / 2;
lp.setMargins(distX - deltaX, 0, 0, radius - distY - deltaY);
elem.setLayoutParams(lp);
return elem;
}

public CircleView(Context context, int radius, View[] elements) {
super(context);
this.radius = radius;

RelativeLayout.LayoutParams lpView = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.FILL_PARENT,
RelativeLayout.LayoutParams.FILL_PARENT);
this.setLayoutParams(lpView);

View center = new View(context);
center.setId(centerId);
RelativeLayout.LayoutParams lpcenter = new RelativeLayout.LayoutParams(
0, 0);
lpcenter.addRule(CENTER_HORIZONTAL);
lpcenter.addRule(CENTER_VERTICAL);
center.setLayoutParams(lpcenter);
this.addView(center);

this.addView(prepareElementForCircle(elements[0], 0, 0));
if (elements.length % 2 == 0) {
this.addView(prepareElementForCircle(elements[elements.length / 2],
0, 2 * radius));
}
if (elements.length > 2) {
for (int i = 1; i <= (elements.length - 1) / 2; i++) {
int y = i * 4 * radius / elements.length;
int x = (int) Math.sqrt(Math.pow(radius, 2)
- Math.pow((radius - y), 2));
this.addView(prepareElementForCircle(elements[i], x, y));
this.addView(prepareElementForCircle(elements[elements.length
- i], -x, y));
}
}
}

}


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