ListView中item删除动画效果

在android中listview控件使用的比较多，如果在listview上面有些动画会增色不少，listview上面的动画确实也不少，好多动画基本都是国外的大神写的。

有个github的下载地址里面包含了各种各样的listview动画，地址：https://github.com/nhaarman/ListViewAnimations。

我这个也是看了别人写的，摘抄了下。因为自己也是个菜鸟。

首先定义一个listview中适配器一行的布局：

然后定义一个适配器对象ArrayAdapter:

	public class MyAnimListAdapter extends ArrayAdapter {
		private LayoutInflater mInflater;
		private int resId;

		public MyAnimListAdapter(Context context, int textViewResourceId, List objects) {
			super(context, textViewResourceId, objects);
			this.resId = textViewResourceId;
			this.mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		}

		@Override
		public View getView(final int position, View convertView, ViewGroup parent) {
			final View view;
			ViewHolder vh;
			MyCell cell = (MyCell)getItem(position);

			if (convertView==null) {
				view = mInflater.inflate(R.layout.chain_cell, parent, false);
				setViewHolder(view);
			}
			else if (((ViewHolder)convertView.getTag()).needInflate) {
				view = mInflater.inflate(R.layout.chain_cell, parent, false);
				setViewHolder(view);
			}
			else {
				view = convertView;
			}

			vh = (ViewHolder)view.getTag();
			vh.text.setText(cell.name);
			vh.imageButton.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					deleteCell(view, position);
				}
			});

			return view;
		}

		private void setViewHolder(View view) {
			ViewHolder vh = new ViewHolder();
			vh.text = (TextView)view.findViewById(R.id.cell_name_textview);
			vh.imageButton = (ImageButton) view.findViewById(R.id.cell_trash_button);
			vh.needInflate = false;
			view.setTag(vh);
		}
	}

然后定义个动画监听和动画对象：

	private void deleteCell(final View v, final int index) {
		AnimationListener al = new AnimationListener() {
			@Override
			public void onAnimationEnd(Animation arg0) {
				mAnimList.remove(index);

				ViewHolder vh = (ViewHolder)v.getTag();
				vh.needInflate = true;

				mMyAnimListAdapter.notifyDataSetChanged();
			}
			@Override public void onAnimationRepeat(Animation animation) {}
			@Override public void onAnimationStart(Animation animation) {}
		};

		collapse(v, al);
	}

	private void collapse(final View v, AnimationListener al) {
		final int initialHeight = v.getMeasuredHeight();

		Animation anim = new Animation() {
			@Override
			protected void applyTransformation(float interpolatedTime, Transformation t) {
				if (interpolatedTime == 1) {
					v.setVisibility(View.GONE);
				}
				else {
					v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime);
					v.requestLayout();
				}
			}

			@Override
			public boolean willChangeBounds() {
				return true;
			}
		};

		if (al!=null) {
			anim.setAnimationListener(al);
		}
		anim.setDuration(ANIMATION_DURATION);
		v.startAnimation(anim);
	}

上面主要是getview中调用删除每一个item的动画实现，后面随便定义一个listview对象和数据源把这个listview显示出来就行看到效果了。

代码来自:https://github.com/paraches/ListViewCellDeleteAnimation