Question

我有下课。取决于我应该动态启动/停止动画的东西。我可以通过调用startAnimation()方法来运行动画，但是当我调用stopAnimation()时，动画不会停止。有趣的是，在调用ivSonar1方法后，偶数ivSonar2和stopAnimation()仍然可见。

任何想法都会受到赞赏。感谢。

public class SonarView extends RelativeLayout
{
    private static final int ANIM_LENGTH_IN_MS = 1500;

    private ImageView ivSonar1;
    private ImageView ivSonar2;

    private AnimationSet animationSet1;
    private AnimationSet animationSet2;

    public SonarView(Context context)
    {
        super(context);
    }

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

    public SonarView(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public SonarView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)
    {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        // try to make it 25% smaller than its real size to make enough room for items of biding list
        super.onMeasure(widthMeasureSpec * 3 / 4, heightMeasureSpec * 3 / 4);

        ivSonar1 = (ImageView) findViewById(R.id.ivSonar1);
        ivSonar1.setVisibility(INVISIBLE);
        ivSonar2 = (ImageView) findViewById(R.id.ivSonar2);
        ivSonar2.setVisibility(INVISIBLE);

        float maxWidth = findViewById(R.id.ivBackground).getMeasuredWidth();

        animationSet1 = createAnimationSet(ivSonar1, maxWidth / ivSonar1.getMeasuredWidth());
        animationSet2 = createAnimationSet(ivSonar2, maxWidth / ivSonar2.getMeasuredWidth());
        animationSet2.setStartOffset(150);
    }

    @Override
    protected void onFinishInflate()
    {
        super.onFinishInflate();

        LayoutInflater.from(this.getContext()).inflate(R.layout.widget_sonar_view, this, true);
    }

    private AnimationSet createAnimationSet(final View v, final float toScale)
    {
        // Set animation
        final AnimationSet animationSet = new AnimationSet(true);
        animationSet.setInterpolator(new AccelerateDecelerateInterpolator());
        animationSet.setDuration(SonarView.ANIM_LENGTH_IN_MS);
        animationSet.setAnimationListener(new Animation.AnimationListener()
        {
            @Override
            public void onAnimationStart(Animation animation)
            {
                v.setAlpha(1.0f);
            }

            @Override
            public void onAnimationEnd(Animation animation)
            {
                v.setAlpha(0.0f);

                animationSet.setStartOffset(0);
                v.startAnimation(animationSet);
            }

            @Override
            public void onAnimationRepeat(Animation animation)
            {

            }
        });

        // TODO The scale animation should ideally scaled to the size of the outer ring, hacking it here instead to use alpha so that I don't have to the calculation right now. Will come back to this.
        // Alpha animation
        animationSet.addAnimation(new AlphaAnimation(1.0f, 0.0f));
        // Scale animation
        animationSet.addAnimation(new ScaleAnimation(0.0f, toScale, 0.0f, toScale, Animation.RELATIVE_TO_SELF, 0.5f,
                        Animation.RELATIVE_TO_SELF, 0.5f));

        return animationSet;
    }

    public void stopAnimation()
    {
        if (ivSonar1 == null || ivSonar2 == null)
        {
            return;
        }

        ivSonar1.setVisibility(INVISIBLE);
        ivSonar2.setVisibility(INVISIBLE);

        animationSet1.cancel();
        animationSet2.cancel();

        ivSonar1.clearAnimation();
        ivSonar2.clearAnimation();
    }

    public void startAnimation()
    {
        if (ivSonar1 == null || ivSonar2 == null)
        {
            return;
        }

        ivSonar1.setVisibility(VISIBLE);
        ivSonar2.setVisibility(VISIBLE);

        animationSet1.reset();
        animationSet2.reset();
        animationSet2.setStartOffset(150);

        ivSonar1.startAnimation(animationSet1);
        ivSonar2.startAnimation(animationSet2);
    }
}

Answer 1

要停止AnimationSet，您可能还需要删除所有侦听器：

animationSet.setAnimationListener(null);
animationSet.cancel();

如何在Android中停止动画集？

1 个答案: