Android 开始前序列动画冻结

Question

我有两个序列动画（xml 文件）。我想在第一个动画停止时开始第二个动画。这是我的源代码：

    mFingerprintIcon.setImageResource(0);
    mFingerprintIcon.setBackgroundResource(R.drawable.finger_print_first_animation);
    final AnimationDrawable animFirst = (AnimationDrawable) mFingerprintIcon.getBackground();

    mFingerprintStatus.setTextColor(ContextCompat.getColor(getActivity(), R.color.success_color));
    mFingerprintStatus.setText(getResources().getString(R.string.fingerprint_success));


    int iDuration = 0;

    for (int i = 0; i < animFirst.getNumberOfFrames(); i++) {
        iDuration += animFirst.getDuration(i);
    }

    animFirst.start();


    Handler handler2 = new Handler();
    handler2.postDelayed(new Runnable() {
        @Override
        public void run() {
            animFirst.stop();
            mFingerprintIcon.setBackgroundResource(R.drawable.finger_print_second_animation);
            AnimationDrawable animSecond = (AnimationDrawable) mFingerprintIcon.getBackground();
            animSecond.setOneShot(false);
            animSecond.start();

        }
    }, iDuration);

此代码有效，但有一个问题。第二个动画停顿了几秒钟然后开始。

我怎样才能编写代码，使两个动画都在不冻结的情况下进行动画处理？

Answer 1

使用 AnimationListener :

public class YourClass extends Activity implements Animation.AnimationListener {

    ...
    animFirst.setListener(this);

并在 onAnimationEnd 方法中开始你的第二个动画。

或者在匿名内部 class :

animFirst.setListener(new AnimationListener() {

    public void onAnimationEnd(Animation animation) {
        animSecond.start();
    }

    public void onAnimationRepeat(Animation animation) {
    }

    public void onAnimationStart(Animation animation) {
    }
});

Answer 2

正确 Answer.I 自己测试使用 Sequence 动画的最佳方法是创建动画 programmatically.for 这样的示例

animSecond = new AnimationDrawable();
    animFirst = new AnimationDrawable();

    animFirst.setOneShot(true);
    animFirst.addFrame(
            getResources().getDrawable(R.drawable.fingerprint_00001),
            50);
    animFirst.addFrame(
            getResources().getDrawable(R.drawable.fingerprint_00002),
            50);



        int iDuration = 0;

    for (int i = 0; i < animFirst.getNumberOfFrames(); i++) {
        iDuration += animFirst.getDuration(i);
    }
    mFingerprintIcon.setImageDrawable(animFirst);
    animFirst.start();


    Handler handler2 = new Handler();
    handler2.postDelayed(new Runnable() {
        @Override
        public void run() {
            animFirst.stop();
            if (animFadeOut != null) {
                mFingerprintStatus.startAnimation(animFadeOut);
                mFingerprintStatus.setVisibility(View.INVISIBLE);
            }
            mFingerprintIcon.setImageDrawable(animSecond);

            animSecond.start();




        }
    }, iDuration);

Android 开始前序列动画冻结

Sequence animation freezing before start in Android

android

android-animation

android-imageview