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() {@Overridepublic 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() {@Overridepublic 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@Overrideprotected 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();}@Overrideprotected 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();}
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