列表视图行使用淡入动画多次动画

Question

我在 ListView

与 Fade In Animation 一起工作

但是我遇到了奇怪的错误：

有些行再次设置动画，但没有为它们调用 getView()。这怎么可能？

我的自定义适配器如下：MyAdapter.java

public class MyAdapter extends ArrayAdapter<String> {

    private Context mContext;
    private Animation mAnim;
    private String[] mData;
    private ListView mList;


    public MyAdapter(Context context, int resource, String[] objects, ListView mList) {
        super(context, resource, objects);
        this.mContext = context;
        mAnim = AnimationUtils.loadAnimation(context, R.anim.fade_in);
        this.mData = objects;
        this.mList = mList;
    }

    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {


        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);

        ViewHolder mHolder;
        if (convertView == null) {
            mHolder = new ViewHolder();
        } else {
            mHolder = (ViewHolder) convertView.getTag();

        }
        view.setTag(mHolder);

        mHolder.mTextview = (TextView) view.findViewById(android.R.id.text1);

        mHolder.mTextview.setText(mData[position]);

        if (mList.getFirstVisiblePosition() < position && position <= (mList.getFirstVisiblePosition() + mList.getChildCount())) {
            Log.w("list", "scroll down..");
            view.startAnimation(mAnim);

        } else if (position < mList.getFirstVisiblePosition()) {
            Log.w("list", "scroll up..");
            view.startAnimation(mAnim);
        }


        return view;
    }

    static class ViewHolder {
        private TextView mTextview;
    }
}

非常感谢任何帮助..

谢谢

Answer 1

尝试这样做。

ObjectAnimator animator = ObjectAnimator.ofFloat(view, View.ALPHA,0,1);
    animator.setDuration(1000);
    animator.start();

希望对您有所帮助

Answer 2

@Ram Mondal 回答绝对正确..

但我也尝试使用 ViewPropertyAnimation 并且它有效:

 view.setAlpha(0);   // Initially setting alpha to 0.0 value
    ViewHolder mHolder;
    if (convertView == null) {
        mHolder = new ViewHolder();
    } else {
        mHolder = (ViewHolder) convertView.getTag();
    }
    view.setTag(mHolder);
    mHolder.mTextview = (TextView) view.findViewById(android.R.id.text1);
    mHolder.mTextview.setText(mData[position]);

    // this was trick : this worked very correctly
    view.animate().setDuration(500).alpha(1).withEndAction(new Runnable() {
        @Override
        public void run() {
            // any work to do after animation completed
        }
    });

感谢 Google IO ListView 动画视频 DevBytes：Video 并感谢 Chat Hasse 先生分享精彩知识..

列表视图行使用淡入动画多次动画

Listview rows animating multiple times with Fade-in animation

android

android-animation

android-listview