Android常用方法

1．	ListView控制绑定数据与获取ListView点击的ID

        List<Person> persons = personService.getScrollData(0, 5);
        List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
        for(Person person : persons){
        	HashMap<String, Object> item = new HashMap<String, Object>();
        	item.put("id", person.getId());
        	item.put("name", person.getName());
        	item.put("amount", person.getAmount());
        	data.add(item);
        }
//如果业务层返回的是Cursor，则可使用SimpleCursorAdapter适配器 ，参考代码如下面蓝色部分，精简很多：
//注SQLlite建议表的主键采用：”_id”，如果不是，在查找的SQL语句可以用别名把其中的id字段改为_id，否则布署时会报错
/***************************************
Cursor cursor = personService.getCursorScrollData(0, 5);
        SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item, cursor,
        		new String[]{"_id", "name", "amount"}, new int[]{R.id.id, R.id.name, R.id.amount});
        listView.setAdapter(adapter);
//监听事件
        listView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
				ListView lView = (ListView)parent;
				Cursor data = (Cursor)lView.getItemAtPosition(position); //取得该位置数据
				int personid = data.getInt(data.getColumnIndex("_id"));
				Toast.makeText(MainActivity.this, personid+"", 1).show();//第2个须为字符串
			}
		});  
/*********************************************
//R.layout.item 为item所在界面
//第3和第4个参数，为对应的值赋给另一个，类似from…to…
        SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
        		new String[]{"id", "name", "amount"}, new int[]{R.id.id, R.id.name, R.id.amount});
        listView.setAdapter(adapter);
        
//为ListView控制添加点击监听，获取点击的item的id
        listView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
				ListView lView = (ListView)parent;
				HashMap<String, Object> item = (HashMap<String, Object>)lView.getItemAtPosition(position);
				Toast.makeText(MainActivity.this, item.get("id").toString(), 1).show(); //提示id
			}
		});
		
2．	音乐播放时，有电话呼入时，事件的处理
	@Override
	protected void onPause() {//如果突然电话到来，停止播放音乐
		if(mediaPlayer.isPlaying()){
			position = mediaPlayer.getCurrentPosition();//保存当前播放点
			mediaPlayer.stop();
		}
		super.onPause();
	}

	@Override
	protected void onResume() {
		if(position>0 && filename!=null){//如果电话结束，继续播放音乐
			try {
				play();
				mediaPlayer.seekTo(position); //恢复至先前的播放位置
				position = 0;
			} catch (IOException e) {
				Log.e(TAG, e.toString());
			}
		}
		super.onResume();
	}