Android ListView项收缩效果

项目中看到IOS上LIstView在显示隐藏一部分时有一个收缩的特效，但Android自带的没有。就想着能否自定义实现，下面是从项目中提取出来的Demo。
先上效果图：

[img]http://dl2.iteye.com/upload/attachment/0105/6828/7871e9c9-acb0-3a83-acd8-7d31f0ce2de3.png[/img]

点击每一行右边的图标显示隐藏；

一、自定义了ExpandableLayout是继承自LinearLayout：

package com.jerome.expand;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;

public class ExpandableLayout extends LinearLayout {
	private String TAG = ExpandableLayout.class.getSimpleName();

	private int layoutHeight = -1;
	private int OPEN_LAYOUT_TIMES = 20;
	private int SLEEP_TIME = 15;
	private float layoutStep = 8;

	private OnExpandFinishListener onExpand = null;
	private OnCollapseFinishListener onCollapse = null;

	public interface OnExpandFinishListener {
		public void onExpandFinish();
	}

	public interface OnCollapseFinishListener {
		public void onCollapseFinish();
	}

	public void setOnExpandFinishListener(OnExpandFinishListener oeListener) {
		onExpand = oeListener;
	}

	public void setOnCollapseFinishListener(OnCollapseFinishListener ocListener) {
		onCollapse = ocListener;
	}

	public void setLayoutHeight(int height) {
		layoutHeight = height;
		layoutStep = 1.0f * layoutHeight / OPEN_LAYOUT_TIMES;
	}

	public ExpandableLayout(Context context) {
		super(context);
	}

	public ExpandableLayout(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public void collapse() {
		new Thread() {
			public void run() {
				for (int i = 0; i < OPEN_LAYOUT_TIMES + 1; i++) {
					final int ii = i;
					post(new Thread() {
						public void run() {
							LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, (int) ((OPEN_LAYOUT_TIMES -ii) * layoutStep));
							setLayoutParams(params);
							if (ii == OPEN_LAYOUT_TIMES) {
								setVisibility(View.GONE);
								if(null!=onCollapse){
									onCollapse.onCollapseFinish();
								}
							}
						}
					});

					try {
						Thread.sleep(SLEEP_TIME);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}.start();
	}

	public void expand() {
		if (layoutHeight <= 0) {
			return;
		}

		android.widget.LinearLayout.LayoutParams params = new android.widget.LinearLayout.LayoutParams(
				LayoutParams.MATCH_PARENT, 0);
		setLayoutParams(params);
		setVisibility(View.VISIBLE);

		new Thread() {
			public void run() {
				for (int i = 0; i < OPEN_LAYOUT_TIMES + 1; i++) {
					final int ii = i;
					post(new Thread() {
						public void run() {
							LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,(int) (ii * layoutStep));
							setLayoutParams(params);

							if (ii == OPEN_LAYOUT_TIMES) {
								if(null!=onExpand){
									onExpand.onExpandFinish();
								}
							}
						}
					});

					try {
						Thread.sleep(SLEEP_TIME);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}.start();
	}
}

二、在Listview的Item配置文件中使用：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/list_item_text"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:layout_weight="1"
            android:paddingBottom="5dip"
            android:textColor="#FFFFFFFF"
            android:textSize="18dp" />

        <ImageView
            android:id="@+id/list_item_more"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:paddingLeft="10dip"
            android:src="@drawable/indicate_more_oper_icon_pressed" />
    </LinearLayout>

    <com.jerome.expand.ExpandableLayout
        android:id="@+id/list_item_more_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#ff303537"
        android:orientation="horizontal"
        android:paddingBottom="15dip"
        android:paddingTop="15dip"
        android:visibility="gone" >

        <LinearLayout
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_weight="1"
            android:gravity="center"
            android:orientation="horizontal" >

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/icon_music_not_collect" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dip"
                android:text="收藏"
                android:textColor="#FFFFFFFF"
                android:textSize="14sp" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_weight="1"
            android:gravity="center"
            android:orientation="horizontal" >

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/icon_music_delete" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dip"
                android:gravity="center_horizontal"
                android:text="删除"
                android:textColor="#FFFFFFFF"
                android:textSize="14sp" />
        </LinearLayout>
    </com.jerome.expand.ExpandableLayout>

</LinearLayout>

三、在代码中使用：

	class MyAdapter extends BaseAdapter {

		List<String> data = new ArrayList<String>();

		MyAdapter() {
			initData();
		}

		private void initData() {
			for (int i = 0; i < 30; i++) {
				data.add("第" + i + "行");
			}
		}

		@Override
		public int getCount() {
			return data.size();
		}

		@Override
		public Object getItem(int position) {
			return data.get(position);
		}

		@Override
		public long getItemId(int position) {
			return 0;
		}

		@Override
		public View getView(final int position, View convertView, ViewGroup parent) {
			final HolderView holder;
			if (convertView == null) {
				holder = new HolderView();
				convertView = LayoutInflater.from(MainActivity.this).inflate(R.layout.list_item, null);
				holder.text = (TextView)convertView.findViewById(R.id.list_item_text);
				holder.more = (ImageView)convertView.findViewById(R.id.list_item_more);
				holder.moreLayout = (ExpandableLayout)convertView.findViewById(R.id.list_item_more_layout);
				convertView.setTag(holder);
			} else {
				holder = (HolderView)convertView.getTag();
			}
			holder.more.setOnClickListener(new OnClickListener(){

				@Override
				public void onClick(View v) {
					int visable = holder.moreLayout.getVisibility();
					if (visable == View.VISIBLE) {
						holder.moreLayout.setLayoutHeight(150);
						holder.moreLayout.setOnCollapseFinishListener(new OnCollapseFinishListener(){

							@Override
							public void onCollapseFinish() {
								selectedPosition = -1;
							}

						});
						holder.moreLayout.collapse();
					} else {
						holder.moreLayout.setLayoutHeight(150);
						holder.moreLayout.expand();
						selectedPosition = position;
notifyDataSetChanged();
					}
				}

			});

			if (selectedPosition == position) {
				holder.moreLayout.setVisibility(View.VISIBLE);
			} else {
				holder.moreLayout.setVisibility(View.GONE);
			}
			holder.text.setText(data.get(position));
			return convertView;
		}

	}

demo见附件！！！