Android数据显示之ListView

1.使用SimpleAdapter

List<Person> persons = personService.getScrollData(0, 5); //构造SimpleAdapter的参数类型List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>(); //把Person数据放到HashMap当中去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); }//把数据绑定到SimpleAdapter 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); //设置ListView点击事件响应 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();}});

public List<Person> getScrollData(Integer offset, Integer maxResult){List<Person> persons = new ArrayList<Person>();SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.rawQuery("select * from person limit ?,?",new String[]{offset.toString(), maxResult.toString()});while(cursor.moveToNext()){int personid = cursor.getInt(cursor.getColumnIndex("personid"));String name = cursor.getString(cursor.getColumnIndex("name"));int amount = cursor.getInt(cursor.getColumnIndex("amount"));Person person = new Person(personid, name);person.setAmount(amount);persons.add(person);}cursor.close();return persons;}

2.使用SimpleCursorAdapter

//获取前五项数据，注意这里Cursor里面必须有"_id",否则Cursor不会工作Cursor cursor = personService.getCursorScrollData(0, 5);//使用SimpleCursorAdapter 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);//设置ListView点击事件响应 listView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {ListView lView = (ListView)parent;//把当前位置强制转换为CursorCursor data = (Cursor)lView.getItemAtPosition(position);//获取当前item的位置信息int personid = data.getInt(data.getColumnIndex("_id"));//显示出当前item的id信息Toast.makeText(MainActivity.this, personid+"", 1).show();}});

//注意这里的personid as _id，是因为Cursor里面必须有_id

public Cursor getCursorScrollData(Integer offset, Integer maxResult){SQLiteDatabase db = dbOpenHelper.getReadableDatabase();//注意这里的personid as _id，是因为Cursor里面必须有_idreturn db.rawQuery("select personid as _id, name, amount from person limit ?,?",new String[]{offset.toString(), maxResult.toString()});}

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