Question

我有一系列逐帧动画，这些动画将被合并到一个程序中（3个动画，每个动画200-300帧）。在Android SDK中显示这些内容的最佳方式是什么？我尝试使用动画列表，但这些似乎想要同时缓冲所有图像，导致设备内存不足。

Answer 1

我遇到了完全相同的问题目前我正在使用我在onDraw方法中从ImageView派生的自定义类来播放动画我从assets文件夹中读取了一个图像并将该图像分配给画布，每次检查特定时间（在我的情况下为60毫秒）是否已经过去，决定是否必须在最后显示新图像我调用postInvalidate（）以便再次调用onDraw。这种方法在我的HTC Desire上运行良好，但我没有机会在规格较低的设备上进行测试如果没有人提供更好的解决方案，我就无法发布我的代码，以便其他人可以发表评论。

编辑：

    public class AnimationView extends ImageView
    {
private static final String TAG = "AnimView";
//public fields
public String STRING_FORMAT_FOR_PADDING = "%04d";
private String FILE_TYPE = "png";
public boolean STOP_AT_LAST_FRAME = true;
public int DELAY = 60; //delay between frames in milliseconds

//private fields
private boolean mIsPlaying = false;
private boolean mStartPlaying = false;
private Context mContext = null;
private int play_frame = 0;
private long last_tick = 0;
private Bitmap curentFrame = null;
private String dir;
private String prefix;
private int numberOfFrames;
private AnimationViewAnimFinished finishListener;
public AnimationView(Context context, AttributeSet attrs)
{
    super(context, attrs);
    mContext = context;  
}

public void setUpAnimation(String dir, String prefix, int numberOfFrames)
{
    this.dir = dir;
    this.prefix = prefix;
    this.numberOfFrames = numberOfFrames;
    curentFrame = loadImage(1);  //set first frame of animation to curent frame

}

public void setAnimationFinishListener(AnimationViewAnimFinished finishListener)
{
    this.finishListener = finishListener;
}

@Override
protected void onDraw(Canvas c)
{
    //Log.d(TAG, "onDraw called");
    if (mStartPlaying)
    {
        Log.d(TAG, "starting animation...");
        play_frame = 1;
        mStartPlaying = false;
        mIsPlaying = true;
        c.drawBitmap(curentFrame,  0, 0, null); // blink fix
        postInvalidate();
    }
    else if (mIsPlaying)
    {
        if (play_frame >= numberOfFrames)
        {
            mIsPlaying = false;
            if (STOP_AT_LAST_FRAME)
            {
                c.drawBitmap(curentFrame,  0, 0, null);
            }
            if (finishListener != null)
                finishListener.animationFinished(); //finish callback called
        }
        else
        {
            long time = (System.currentTimeMillis() - last_tick);
            int draw_x = 0;
            int draw_y = 0;
            if (time >= DELAY) //the delay time has passed. set next frame
            {
                Log.d(TAG, "drawing frame number:"+play_frame+" signature:"+curentFrame.toString());
                last_tick = System.currentTimeMillis();
                play_frame++;
                curentFrame = loadImage(play_frame);
            }
            c.drawBitmap(curentFrame,  draw_x, draw_y, null);
            postInvalidate();
        }
    }
    else //before animation starts ... drawing first frame
    {
        c.drawBitmap(curentFrame,  0, 0, null);
    }
}

private Bitmap loadImage(int numFrame)
{
    long startOne = android.os.SystemClock.uptimeMillis();
    String name =dir+ prefix + String.format(STRING_FORMAT_FOR_PADDING, numFrame)+"."+FILE_TYPE;

    InputStream ins = null;
    try {
        ins = mContext.getAssets().open(name);
    } catch (IOException e) {
        e.printStackTrace();
    }
    Bitmap d = BitmapFactory.decodeStream(ins);
    long endOne = android.os.SystemClock.uptimeMillis();
    Log.d(TAG,name+" frame decoded in: "+String.valueOf(endOne-startOne)+" ms");
    return d;

}

//set flag for starting animation to true and inicicate redraw
public void playAnimation()
{
    Log.d(TAG,"Play animation + invalidate()");
    mStartPlaying = true;
    postInvalidate();
}

//callack class for method restaurants
public static abstract class AnimationViewAnimFinished{
    public abstract void animationFinished();
}

}

在onCreate活动方法中我有：

    animationHolder = (AnimationView)findViewById(R.id.imageViewAnimationHolderService);
    animationHolder.setUpAnimation("animation1/", "frame_", 212);
    animationHolder.setAnimationFinishListener(myAnimationFinishListener);

在资产中我在该文件夹中有“animation1”文件夹我有212个.png图像命名（frame_0001.png，frame_0002.png，frame_0003.png，...，frame_0212.png）

当我开始制作动画时，我打电话：

    animationHolder.playAnimation();

这是动画完成侦听器的代码：

        AnimationViewAnimFinished myAnimationFinishListener = new AnimationViewAnimFinished() {

    @Override
    public void animationFinished() {
        Log.d(TAG,"animation finished");

    }
};

在android中显示大型预渲染动画的首选方法是什么？

1 个答案: