学步园

例如mp3播放器的音乐播放列表，点击一个item后开始播放音乐(OnItemClickListener)，长按让其进入编辑模式（不跳转到另一个页面，还在同一个页面），此时用到了OnItemLongClickListener，然后再次长按某一个音乐的条目进行拖动（改变列表顺序），这时需要屏蔽掉上一次长按进入编辑模式的事件。实现代码如下

package com.example.longdoubleclickdemo;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private ListView mMusicListView;
	private List<MusicItem> musicList;
	private MyAdapter mAdapter;
	private TextView mTitleName;
	private boolean mEditMode;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mTitleName = (TextView)findViewById(R.id.titlebar);
		mMusicListView = (ListView)findViewById(R.id.music_list);
		initData();
		mAdapter = new MyAdapter(this);
		mMusicListView.setAdapter(mAdapter);
		initListeners();
	}
	
	private void initData()
	{
		musicList = new ArrayList<MusicItem>();
		for(int i = 0; i < 20; i++)
		{
			musicList.add(setMusicItem(i));
		}
	}
	
    public boolean getEditMode()
    {
        return mEditMode;
    }

    public void setEditMode(boolean mEditMode)
    {
        this.mEditMode = mEditMode;
    }
	
	private void initListeners()
	{
		mMusicListView.setOnItemClickListener(new ListView.OnItemClickListener()
		{

			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,
					long id) {
				//Toast.makeText(getApplicationContext(), "默认模式", Toast.LENGTH_SHORT).show();
			}
			
		});
		
		mMusicListView.setOnItemLongClickListener(new ListView.OnItemLongClickListener()
		{

			@Override
			public boolean onItemLongClick(AdapterView<?> parent, View view,
					int position, long id) {
				boolean mEditMode = getEditMode();
				if(!mEditMode)
				{
					setEditMode(true);
					Toast.makeText(getApplicationContext(), "进入编辑模式", Toast.LENGTH_SHORT).show();
					mTitleName.setText("编辑模式");
				}else{
					Toast.makeText(getApplicationContext(), "编辑 "+position, Toast.LENGTH_SHORT).show();
				}
				return false;
			}
			
		});
	}
	
	public MusicItem setMusicItem(int position)
	{
		MusicItem musicItem = new MusicItem();
		musicItem.setMusicTitle("music "+position);
		musicItem.setMusicDragIcon(getResources().getDrawable(
					R.drawable.change_order_grip));
		return musicItem;
	}
	
	static class ViewHolder
	{
		public TextView musicName;
		public ImageView musicDragIcon;
	}
	
	class MyAdapter extends BaseAdapter
	{
		private LayoutInflater mInflater = null;
		
		public MyAdapter(Context context)
		{
			this.mInflater = LayoutInflater.from(context);
		}
		@Override
		public int getCount() {
			return musicList.size();
		}

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

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

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder holder = null;
			if(null == convertView)
			{
				holder = new ViewHolder();
				convertView = mInflater.inflate(R.layout.music_list_item, null);
				holder.musicName = (TextView)convertView.findViewById(R.id.music_name);
				holder.musicDragIcon = (ImageView)convertView.findViewById(R.id.music_drag);
				convertView.setTag(holder);
			}else
			{
				holder = (ViewHolder)convertView.getTag();
			}
			holder.musicName.setText(musicList.get(position).getMusicTitle());
			holder.musicDragIcon.setImageDrawable(musicList.get(position).getMusicDragIcon());
			return convertView;
		}
		
	}

}

　运行结果：第一次长按触发进入编辑模式，例如导航栏目的改变，第二次或以后再长按触发item则执行其他的item时间，例如拖拽更改列表顺序（以后更新）