Android Open Source - android-circlebutton Circle Button

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License

The source code is released under:

Apache License

Java Source Code

package at.markushi.ui;
//w  ww.  ja  v  a2  s  .com
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.ImageView;

import at.markushi.circlebutton.R;

public class CircleButton extends ImageView {

  private static final int PRESSED_COLOR_LIGHTUP = 255 / 25;
  private static final int PRESSED_RING_ALPHA = 75;
  private static final int DEFAULT_PRESSED_RING_WIDTH_DIP = 4;
  private static final int ANIMATION_TIME_ID = android.R.integer.config_shortAnimTime;

  private int centerY;
  private int centerX;
  private int outerRadius;
  private int pressedRingRadius;

  private Paint circlePaint;
  private Paint focusPaint;

  private float animationProgress;

  private int pressedRingWidth;
  private int defaultColor = Color.BLACK;
  private int pressedColor;
  private ObjectAnimator pressedAnimator;

  public CircleButton(Context context) {
    super(context);
    init(context, null);
  }

  public CircleButton(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(context, attrs);
  }

  public CircleButton(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init(context, attrs);
  }

  @Override
  public void setPressed(boolean pressed) {
    super.setPressed(pressed);

    if (circlePaint != null) {
      circlePaint.setColor(pressed ? pressedColor : defaultColor);
    }

    if (pressed) {
      showPressedRing();
    } else {
      hidePressedRing();
    }
  }

  @Override
  protected void onDraw(Canvas canvas) {
    canvas.drawCircle(centerX, centerY, pressedRingRadius + animationProgress, focusPaint);
    canvas.drawCircle(centerX, centerY, outerRadius - pressedRingWidth, circlePaint);
    super.onDraw(canvas);
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    centerX = w / 2;
    centerY = h / 2;
    outerRadius = Math.min(w, h) / 2;
    pressedRingRadius = outerRadius - pressedRingWidth - pressedRingWidth / 2;
  }

  public float getAnimationProgress() {
    return animationProgress;
  }

  public void setAnimationProgress(float animationProgress) {
    this.animationProgress = animationProgress;
    this.invalidate();
  }

  public void setColor(int color) {
    this.defaultColor = color;
    this.pressedColor = getHighlightColor(color, PRESSED_COLOR_LIGHTUP);

    circlePaint.setColor(defaultColor);
    focusPaint.setColor(defaultColor);
    focusPaint.setAlpha(PRESSED_RING_ALPHA);

    this.invalidate();
  }

  private void hidePressedRing() {
    pressedAnimator.setFloatValues(pressedRingWidth, 0f);
    pressedAnimator.start();
  }

  private void showPressedRing() {
    pressedAnimator.setFloatValues(animationProgress, pressedRingWidth);
    pressedAnimator.start();
  }

  private void init(Context context, AttributeSet attrs) {
    this.setFocusable(true);
    this.setScaleType(ScaleType.CENTER_INSIDE);
    setClickable(true);

    circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    circlePaint.setStyle(Paint.Style.FILL);

    focusPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    focusPaint.setStyle(Paint.Style.STROKE);

    pressedRingWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DEFAULT_PRESSED_RING_WIDTH_DIP, getResources()
        .getDisplayMetrics());

    int color = Color.BLACK;
    if (attrs != null) {
      final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleButton);
      color = a.getColor(R.styleable.CircleButton_cb_color, color);
      pressedRingWidth = (int) a.getDimension(R.styleable.CircleButton_cb_pressedRingWidth, pressedRingWidth);
      a.recycle();
    }

    setColor(color);

    focusPaint.setStrokeWidth(pressedRingWidth);
    final int pressedAnimationTime = getResources().getInteger(ANIMATION_TIME_ID);
    pressedAnimator = ObjectAnimator.ofFloat(this, "animationProgress", 0f, 0f);
    pressedAnimator.setDuration(pressedAnimationTime);
  }

  private int getHighlightColor(int color, int amount) {
    return Color.argb(Math.min(255, Color.alpha(color)), Math.min(255, Color.red(color) + amount),
        Math.min(255, Color.green(color) + amount), Math.min(255, Color.blue(color) + amount));
  }
}

Java Source Code List

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