SurfaceView 的淡入动画不起作用答案

【问题标题】：Fade-In Animation for SurfaceView not workingSurfaceView 的淡入动画不起作用
【发布时间】：2015-02-17 16:29:43
【问题描述】：

对于普通视图，动画效果非常好。但是当我在 SurfaceView 上使用它时，它会淡出，然后闪烁屏幕，然后开始播放视频。闪烁看起来很傻，我需要删除它。

public class MyDreamService extends DreamService implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener {
    private MediaPlayer mediaPlayer;
    private SurfaceHolder vidHolder;
    private SurfaceView vidSurface;
    private FrameLayout frameLayout;

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        setInteractive(false);
        setFullscreen(true);
    }

    @Override
    public void onDreamingStarted() {
        super.onDreamingStarted();
        frameLayout = new FrameLayout(this);
        frameLayout.setLayoutParams(new
            ViewGroup.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));

        vidSurface = new SurfaceView(MyDreamService.this);
        vidHolder = vidSurface.getHolder();
        vidHolder.addCallback(MyDreamService.this);
        frameLayout.addView(vidSurface,
            new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

        setContentView(frameLayout);
    }

    @Override
    public void onDreamingStopped() {
        super.onDreamingStopped();
        if(mediaPlayer != null) {
            if(mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
            }
        }
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if(mediaPlayer != null) {
            if(mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
            }
            mediaPlayer.reset();
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            vidHolder = holder;
            mediaPlayer = MediaPlayer.create(this, R.raw.voice_activated_corgi);
            mediaPlayer.setLooping(true);
            mediaPlayer.setDisplay(holder);
            mediaPlayer.setOnPreparedListener(this);
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        vidHolder = holder;
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
    }

    @Override
    public void onPrepared(MediaPlayer mp) {
        mediaPlayer.start();
    }
}

这可以很好地播放视频，但如果我想制作动画：

    ObjectAnimator fadeIn = ObjectAnimator.ofFloat(frameLayout, "alpha", .3f, 1f);
    fadeIn.setDuration(2000);

    final AnimatorSet mAnimationSet = new AnimatorSet();

    mAnimationSet.play(fadeIn);

    mAnimationSet.addListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            super.onAnimationEnd(animation);
            if(mediaPlayer != null) {
                mediaPlayer.start();
            }
            if(view != null) {
                view.setAlpha(0f);
            }
        }
    });
    mAnimationSet.start();

然后经过多次迭代，它要么变黑，然后启动器闪烁一秒钟，然后开始播放视频；或者根本没有动画！我该怎么办？

【问题讨论】：

标签： android animation surfaceview

【解决方案1】：

我设法通过使用渐变为黑色的覆盖视图来修复它，一旦动画结束，将视图设置为不可见而不是删除它。

public class MyDreamService extends DreamService implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener {
    private MediaPlayer mediaPlayer;
    private SurfaceHolder vidHolder;
    private SurfaceView vidSurface;
    private FrameLayout frameLayout;
    private View view;

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        setInteractive(false);
        setFullscreen(true);
    }

    @Override
    public void onDreamingStarted() {
        super.onDreamingStarted();
        frameLayout = new FrameLayout(this);
        frameLayout.setLayoutParams(new
            ViewGroup.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));

        setContentView(frameLayout);

        vidSurface = new SurfaceView(MyDreamService.this);
        vidHolder = vidSurface.getHolder();
        vidHolder.addCallback(MyDreamService.this);
        frameLayout.addView(vidSurface,
            new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

        view = new View(this);
        view.setLayoutParams(new ViewGroup.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
        frameLayout.addView(view);


        ObjectAnimator fadeIn = ObjectAnimator.ofFloat(frameLayout, "alpha", .3f, 1f);
        fadeIn.setDuration(2000);

        final AnimatorSet mAnimationSet = new AnimatorSet();

        mAnimationSet.play(fadeIn);

        mAnimationSet.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
                if(mediaPlayer != null) {
                    mediaPlayer.start();
                }
                if(view != null) {
                    view.setAlpha(0f);
                }
            }
        });
        mAnimationSet.start();

    }

    @Override
    public void onDreamingStopped() {
        super.onDreamingStopped();

        if(mediaPlayer != null) {
            if(mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
            }
        }
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if(mediaPlayer != null) {
            if(mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
            }
            mediaPlayer.reset();
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mediaPlayer = MediaPlayer.create(MyDreamService.this, R.raw.voice_activated_corgi);
            mediaPlayer.setLooping(true);
            mediaPlayer.setDisplay(vidHolder);
            mediaPlayer.setOnPreparedListener(MyDreamService.this);
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        vidHolder = holder;
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
    }

    @Override
    public void onPrepared(MediaPlayer mp) {

    }
}

【讨论】：