在我的应用程序中，我有一个listView，其中包含200多个项目，这些项目是使用数据库帮助程序类从数据库中检索的。此listView需要分为10个不同的类别。因此，我正在添加另一个（父）视图。实现这一目标的最佳方法是什么？在需要尽可能少的代码重构的意义上最好的。
public class CompaniesList extends ListActivity {
protected EditText searchText;
protected SQLiteDatabase db;
protected Cursor cursor;
protected ListAdapter adapter;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
searchText = (EditText) findViewById(R.id.searchText);
db = (new DatabaseHelper(this)).getWritableDatabase();
}
public void onListItemClick(ListView parent, View view, int position,
long id) {
Intent intent = new Intent(this, CompanyDetails.class);
Cursor cursor = (Cursor) adapter.getItem(position);
intent.putExtra("EMPLOYEE_ID",
cursor.getInt(cursor.getColumnIndex("_id")));
startActivity(intent);
}
public void search(View view) {
// || is the concatenation operation in SQLite
cursor = db
.rawQuery(
"SELECT _id, name, address FROM employee WHERE employee.name LIKE ?",
new String[] { "%" + searchText.getText().toString()
+ "%" });
adapter = new SimpleCursorAdapter(this, R.layout.company_list_item,
cursor, new String[] { "name", "address" }, new int[] {
R.id.name, R.id.address }, 0);
setListAdapter(adapter);
}
class CompanyCategoryAdapter extends ArrayAdapter<CompaniesList> {
private LayoutInflater inflator;
static class ViewHolder {
public TextView text;
public ImageView image;
}
private static final int ROW_TYPE_AAA = 0;
private static final int ROW_TYPE_BBB = 1;
private static final int ROW_TYPE_CCC = 2;
private static final int ROW_TYPE_DDD = 3;
private static final int ROW_TYPE_EEE = 4;
private static final int ROW_TYPE_FFF = 5;
private static final int ROW_TYPE_GGG = 6;
private static final int ROW_TYPE_HHH = 7;
private static final int ROW_TYPE_III = 8;
private static final int ROW_TYPE_JJJ = 9;
private static final int ROW_TYPE_KKK = 10;
private static final int ROW_TYPE_LLL = 11;
private static final int ROW_TYPE_MMM = 12;
private static final int ROW_TYPE_NNN = 13;
CompanyCategoryAdapter() {
super(CompaniesList.this, R.layout.main, companies);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
Companies viewHolder;
if (row == null) {
LayoutInflater inflater = getLayoutInflater();
switch (getItemViewType(position)) {
case ROW_TYPE_AAA:
row = inflater.inflate(R.layout.row_aaa, null);
break;
case ROW_TYPE_BBB:
row = inflater.inflate(R.layout.row_bbb, null);
break;
case ROW_TYPE_CCC:
row = inflater.inflate(R.layout.row_ccc, null);
break;
case ROW_TYPE_DDD:
row = inflater.inflate(R.layout.row_ddd, null);
break;
case ROW_TYPE_EEE:
row = inflater.inflate(R.layout.row_eee, null);
break;
case ROW_TYPE_FFF:
row = inflater.inflate(R.layout.row_fff, null);
break;
case ROW_TYPE_GGG:
row = inflater.inflate(R.layout.row_ggg, null);
break;
case ROW_TYPE_HHH:
row = inflater.inflate(R.layout.row_hhh, null);
break;
case ROW_TYPE_III:
row = inflater.inflate(R.layout.row_iii, null);
break;
case ROW_TYPE_JJJ:
row = inflater.inflate(R.layout.row_jjj, null);
break;
case ROW_TYPE_KKK:
row = inflater.inflate(R.layout.row_kkk, null);
break;
case ROW_TYPE_LLL:
row = inflater.inflate(R.layout.row_lll, null);
break;
case ROW_TYPE_MMM:
row = inflater.inflate(R.layout.row_mmm, null);
break;
case ROW_TYPE_NNN:
row = inflater.inflate(R.layout.row_nnn, null);
break;
default:
row = inflater.inflate(R.layout.main, null);
break;
}
viewHolder = new CompanyHolder(row);
row.setTag(viewHolder);
} else {
viewHolder = (CompanyHolder) row.getTag();
}
viewHolder.populateFrom(companies.get(position));
return row;
}
@Override
public int getViewTypeCount() {
return 14;
}
@Override
public int getItemViewType(int position) {
Cursor cursor = (Cursor) adapter.getItem(position);
String type = cursor.getString(cursor.getColumnIndex("department"));
if (type.equals("aaa") == true) {
return ROW_TYPE_AAA;
} else if (type.equals("bbb") == true) {
return ROW_TYPE_BBB;
} else if (type.equals("ccc") == true) {
return ROW_TYPE_CCC;
} else if (type.equals("ddd") == true) {
return ROW_TYPE_DDD;
} else if (type.equals("eee") == true) {
return ROW_TYPE_EEE;
} else if (type.equals("fff") == true) {
return ROW_TYPE_FFF;
} else if (type.equals("ggg") == true) {
return ROW_TYPE_GGG;
} else if (type.equals("hhh") == true) {
return ROW_TYPE_HHH;
} else if (type.equals("iii") == true) {
return ROW_TYPE_III;
} else if (type.equals("jjj") == true) {
return ROW_TYPE_JJJ;
} else if (type.equals("kkk") == true) {
return ROW_TYPE_KKK;
} else if (type.equals("lll") == true) {
return ROW_TYPE_LLL;
} else if (type.equals("mmm") == true) {
return ROW_TYPE_MMM;
} else {
return ROW_TYPE_NNN;
}
}
}
}
答案 0 :(得分：0)
您可以覆盖getViewTypeCount（）和getItemViewType
@Override
public int getViewTypeCount() {
return 10;
}
@Override
public int getItemViewType(int position) {
return getItem(position).getType(); // or whatever is your criteria for distinguish the Types
}
使用这些方法，您可以为getView(..)中的每种类型制作不同的布局，而无需担心已回收的视图。