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Extends AppCompatRatingBar with the ability to tint the drawn stars when selected, pressed and un-selected. Limitation: Only draws full stars.
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.AppCompatRatingBar;
import android.util.AttributeSet;
/**
* @author androidseb
* <p/>
* Extends AppCompatRatingBar with the ability to tint the drawn stars when selected, pressed and un-selected.
* Limitation: Only draws full stars.
*/
public class TintableRatingBar extends AppCompatRatingBar {
private TintableRatingBarProgressDrawable progressDrawable;
public TintableRatingBar(final Context context) {
super(context);
init();
}
public TintableRatingBar(final Context context, final AttributeSet attrs) {
super(context, attrs);
init();
}
public TintableRatingBar(final Context context, final AttributeSet attrs, final int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
progressDrawable = new TintableRatingBarProgressDrawable();
setProgressDrawable(progressDrawable);
}
public void setCustomTintColors(final int _uncheckedColor, final int _pressedColor, final int _checkedColor) {
progressDrawable.setRatingMaxLevelValue(getMax() * 1000);
progressDrawable.setUnCheckedColor(_uncheckedColor);
progressDrawable.setPressedColor(_pressedColor);
progressDrawable.setCheckedColor(_checkedColor);
invalidate();
}
public class TintableRatingBarProgressDrawable extends Drawable {
private static final int STAR_COUNT = 5;
private static final int STAR_BRANCHES_COUNT = 5;
/** Sets the max level value: if the level is at the max, then all stars are selected. */
private int ratingMaxLevelValue = 10000;
/** Color to be painted for unselected stars */
private int uncheckedColor = Color.GRAY;
/** Color to be painted for unselected stars when the ratingbar is pressed */
private int pressedColor = Color.CYAN;
/** Color to be painted for selected stars */
private int checkedColor = Color.BLUE;
@Override
public void setAlpha(final int _i) {
}
@Override
public void setColorFilter(final ColorFilter _colorFilter) {
}
@Override
public boolean isStateful() {
return true;
}
@Override
public boolean setState(final int[] stateSet) {
final boolean res = super.setState(stateSet);
invalidateSelf();
return res;
}
@Override
public int getOpacity() {
return 255;
}
public void setRatingMaxLevelValue(final int _ratingMaxLevelValue) {
ratingMaxLevelValue = _ratingMaxLevelValue;
}
public void setUnCheckedColor(final int _uncheckedColor) {
uncheckedColor = _uncheckedColor;
}
public void setPressedColor(final int _pressedColor) {
pressedColor = _pressedColor;
}
public void setCheckedColor(final int _checkedColor) {
checkedColor = _checkedColor;
}
@Override
public void draw(final Canvas _canvas) {
boolean pressed = false;
for (int i : getState()) {
if (i == android.R.attr.state_pressed) {
pressed = true;
}
}
final int level = (int) Math.ceil(getLevel() / (double) ratingMaxLevelValue * STAR_COUNT);
final int starRadius = Math.min(getBounds().bottom / 2, getBounds().right / STAR_COUNT / 2);
for (int i = 0; i < STAR_COUNT; i++) {
final int usedColor;
if (level >= i + 1) {
usedColor = checkedColor;
} else if (pressed) {
usedColor = pressedColor;
} else {
usedColor = uncheckedColor;
}
drawStar(_canvas, usedColor, (i * 2 + 1) * starRadius, getBounds().bottom / 2, starRadius,
STAR_BRANCHES_COUNT);
}
}
private void drawStar(final Canvas _canvas, final int _color, final float _centerX, final float _centerY,
final float _radius, final int _branchesCount) {
final double rotationAngle = Math.PI * 2 / _branchesCount;
final double rotationAngleComplement = Math.PI / 2 - rotationAngle;
//Calculating how much space is left between the bottom of the star and the bottom of the circle
//In order to be able to center the star visually relatively to the square when drawn
final float bottomOffset = (float) (_radius - _radius * Math.sin(rotationAngle / 2) / Math.tan(
rotationAngle / 2));
final float actualCenterY = _centerY + (bottomOffset / 2);
final Paint paint = new Paint();
paint.setColor(_color);
paint.setStyle(Style.FILL);
final Path path = new Path();
final float relativeY = (float) (_radius - _radius * (1 - Math.sin(rotationAngleComplement)));
final float relativeX = (float) (Math.tan(rotationAngle / 2) * relativeY);
final PointF a = new PointF(-relativeX, -relativeY);
final PointF b = new PointF(0, -_radius);
final PointF c = new PointF(relativeX, -relativeY);
path.moveTo(_centerX + a.x, actualCenterY + a.y);
_canvas.save();
for (int i = 0; i < _branchesCount; i++) {
path.lineTo(_centerX + b.x, actualCenterY + b.y);
path.lineTo(_centerX + c.x, actualCenterY + c.y);
rotationToCenter(b, rotationAngle);
rotationToCenter(c, rotationAngle);
}
_canvas.drawPath(path, paint);
_canvas.restore();
}
private void rotationToCenter(final PointF _point, final double _angleRadian) {
final float x = (float) (_point.x * Math.cos(_angleRadian) - _point.y * Math.sin(_angleRadian));
final float y = (float) (_point.x * Math.sin(_angleRadian) + _point.y * Math.cos(_angleRadian));
_point.x = x;
_point.y = y;
}
}
}
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