package com.example.musicplayer;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import com.example.musicPlayer_liuchunwang.R;
import com.example.service.MusicService;
import com.example.tool.MusicListAdapter;
import com.example.tool.ScanSDReicver;

public class MusicListActivity extends Activity {
	/***音乐列表**/
	private ListView listviews;
	/** 设置三个临时变量，分别存放标题，艺术家 **/
	private int _ids[];
	private String _titles[];
	private String _artists[];
	private String _path[];
	private String _alltime[];
	private AlertDialog ad = null;
	private AlertDialog.Builder builder = null;
	MusicListAdapter adapter;// 音乐列表适配器	
	ScanSDReicver receiver;// 扫描SD卡的。

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.music_list);
		init();
	}
	
	private void init(){
		listviews = (ListView) findViewById(R.id.music_list);
		/** 选择子项点击事件 ***/
		listviews.setOnItemClickListener(new MusicListOnClickListener());
		ShowMp3List();
	}
	/** 显示mp3列表*/
	private void ShowMp3List() {
		// 用游标查找媒体信息
		Cursor cursor = this.getContentResolver().query(
				MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
				new String[] { MediaStore.Audio.Media.TITLE,
						MediaStore.Audio.Media.DURATION,
						MediaStore.Audio.Media.ARTIST,
						MediaStore.Audio.Media._ID,
						MediaStore.Audio.Media.DISPLAY_NAME,
						MediaStore.Audio.Media.DATA,
						MediaStore.Audio.Media.ALBUM_ID }, null, null, null);
		/** 判断游标是否为空，有些地方即使没有音乐也会报异常。因为游标不稳定。稍有不慎就出错了,其次，如果用户没有音乐告知用户没有音乐 */
		if (null != cursor && cursor.getCount() == 0) {
			builder = new AlertDialog.Builder(this);
			builder.setMessage(R.string.music_list_tell).setPositiveButton(
					"确定", null);
			ad = builder.create();
			ad.show();
			return;
		}
		/**将游标移到第一位**/
		cursor.moveToFirst();
		/** 分别实例化**/
		_ids = new int[cursor.getCount()];//
		_titles = new String[cursor.getCount()];
		_artists = new String[cursor.getCount()];
		_path = new String[cursor.getCount()];
		_alltime=new String[cursor.getCount()];
		/***用循环把信息查找出来*/
		for (int i = 0; i < cursor.getCount(); i++) {
			_ids[i] = cursor.getInt(3);
			_titles[i] = cursor.getString(0);
			_artists[i] = cursor.getString(2);
			_path[i] = cursor.getString(5).substring(4);
			_alltime[i]=(toTime(cursor.getInt(1)));
			/***一直将游标往下走**/
			cursor.moveToNext();
		}
		listviews.setAdapter(new MusicListAdapter(this, cursor));
	}
	/**
	 * 时间的转换
	 */
	public String toTime(int time) {
		time /= 1000;
		int minute = time / 60;
		int second = time % 60;
		minute %= 60;
		return String.format("%02d:%02d", minute, second);
	}
	/** 音乐列表添加监听器，点击之后播放音乐*/
	private class MusicListOnClickListener implements OnItemClickListener {
		@Override
		public void onItemClick(AdapterView<?> arg0, View view, int position,
				long id) {
			playMusic(position);
		}
	}
	
	/** 根据列表点击的位置开始播放*/
	public void playMusic(int position) {
		Intent intent = new Intent(MusicListActivity.this,
				PlayMusicActivity.class);
		intent.putExtra("_ids", _ids);
		intent.putExtra("_titles", _titles);
		intent.putExtra("_artists", _artists);
		intent.putExtra("position", position);
		startActivity(intent);
		finish();
	}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
	if(keyCode == KeyEvent.KEYCODE_BACK &&event.getRepeatCount() == 0) {
		new AlertDialog.Builder(MusicListActivity.this)
			.setMessage("确定退出吗?")
			.setTitle("提示").setPositiveButton("确定", new DialogInterface.OnClickListener() {				
				@Override
				public void onClick(DialogInterface dialog, int which) {
					Intent mediaServer = new Intent(MusicListActivity.this, 
							MusicService.class);
					stopService(mediaServer);
					finish();
				}
			})
			.setNegativeButton("取消", null)
			.show();
		return false;
	}
	return super.onKeyDown(keyCode, event);
}
}