ImessageAdapter.java

package com.partynetwork.iparty.imessage;

import java.util.ArrayList;
import java.util.List;

import com.partynetwork.iparty.R;
import com.partynetwork.iparty.info.MessageItemInfo;

import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;

public class ImessageAdapter extends ArrayAdapter<MessageItemInfo> {

	private Context mContext = null;
	private float dx, ux;
	private List<Integer> isdelete = new ArrayList<Integer>();;

	public ImessageAdapter(Context context, List<MessageItemInfo> objects) {
		super(context, 0, objects);
		mContext = context;
		init(getCount());
	}

	@Override
	public void notifyDataSetChanged() {
		init(getCount());
		super.notifyDataSetChanged();
	}

	private void init(int size) {
		isdelete.removeAll(isdelete);
		for (int i = 0; i < size; i++) {
			isdelete.add(0);
		}
	}

	public View getView(final int position, View convertView, ViewGroup parent) {
		View rowView = convertView;
		ImessageItemView imessageItemView;
		if (rowView == null) {
			rowView = LayoutInflater.from(mContext).inflate(
					R.layout.imessage_item, null);
			imessageItemView = new ImessageItemView(rowView);
			rowView.setTag(imessageItemView);
		} else {
			imessageItemView = (ImessageItemView) rowView.getTag();
		}
		MessageItemInfo requst = getItem(position);

		// 加载头像
		// 从网络获取头像
		imessageItemView.setName(requst.getName());
		imessageItemView.setSex(requst.getSex());
		imessageItemView.setTime(requst.getTime());
		imessageItemView.setSay(requst.getSay());

		imessageItemView.setDelete(isdelete.get(position));

		rowView.setOnTouchListener(new OnTouchListener() {
			public boolean onTouch(View v, MotionEvent event) {
				final ImessageItemView view = (ImessageItemView) v.getTag();
				// 当按下时处理
				if (event.getAction() == MotionEvent.ACTION_DOWN) {
					// 获取按下时的x轴坐标
					dx = event.getX();
				} else if (event.getAction() == MotionEvent.ACTION_UP) {// 松开处理
					// 获取松开时的x坐标
					ux = event.getX();
					// 判断当前项中按钮控件不为空时
					if (view.getDelete() != null) {
						// 按下和松开绝对值差当大于20时显示删除按钮，否则不显示
						if ((dx - ux) > 100) {
							if (view.getDelete().getVisibility() == View.GONE) {
								view.getDelete().setVisibility(View.VISIBLE);
								isdelete.set(position, 1);
							}
						} else if ((dx - ux) < -100) {
							if (view.getDelete().getVisibility() == View.VISIBLE) {
								view.getDelete().setVisibility(View.GONE);
								isdelete.set(position, 0);
							}
						} else {
							Intent intent = new Intent(mContext,
									ImessageChatActivity.class);
							intent.putExtra("name", view.getName());
							mContext.startActivity(intent);
						}
					}
				}
				return true;
			}
		});
		imessageItemView.getDelete().setOnClickListener(new OnClickListener() {

			public void onClick(View arg0) {
				if (isdelete.get(position) == 1) {
					isdelete.set(position, 0);
					isdelete.remove(position);
					remove(getItem(position));
					notifyDataSetChanged();
				}
			}
		});

		return rowView;
	}

}