如何使用特定值填充ListView？
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我有一个ListView，其中填充了mysql数据库中的值，并不是所有值都被拉，但是那些符合指定条件的值：if (getHarakterByid (currCount) .equals ("Sale of monitors"))。此时，在listview元素中，一行显示位置，代码和地址值，并且只需要显示一个地址。我该怎么做？尝试SimpleAdapter，但没有出来。
MainActivity.java代码：
public class MainActivity extends Activity {
private Button start;
private Intent districts;
private Intent detail;
private static RequestQueue mQueue;
private static ConnectivityManager connectivityManager;
private static ProgressDialog progressDialog;
private static ArrayAdapter<HashMap<String, Object>> adapter;
private static ArrayAdapter<HashMap<String, Object>> sAdapter;
private ArrayList<HashMap<String, Object>> d_Task;
private static final String it_address = "Address"; // Верхний текст
private static final String it_id = "Position"; // ниже главного
private static final String it_kz = "Kod";
private static Context context;
private static Handler handler;
public static ListView LISTVIEW;
public static final Map<String, String> fields = new HashMap<String, String>(1);
private static final int delay_min = 30 * 1000 * 60;
private Integer verCode;
private String verName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LISTVIEW = (ListView) findViewById(R.id.LIST_VIEW);
LISTVIEW.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
String[] from = {};
adapter = new ArrayAdapter<HashMap<String, Object>>(this, R.layout.main_item,
R.id.main_textitem);
LISTVIEW.setAdapter(adapter);
start = (Button) findViewById(R.id.start);
context = getApplicationContext();
mQueue = Volley.newRequestQueue(context);
detail = new Intent(context, DetailActivity.class);
districts = new Intent(context, DistrictsActivity.class);
connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
try {
verCode = getPackageManager().getPackageInfo(getPackageName(), 0).versionCode;
verName = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
} catch (Exception e) {
}
fields.put("ROOT", context.getString(R.string.DATA));
fields.put("data_unp_err",
context.getString(R.string.data_unpack_error));
fields.put("ver_remind", context.getString(R.string.ver_remind_text));
DataStruct.getStruct().setPrefObj(getPreferences(MODE_PRIVATE));
DataStruct.getStruct().getPrefObj()
.setCurrVersionInfo(verName, verCode);
DataStruct.getStruct().setRequestQueue(mQueue);
DataStruct.getStruct().setMAdapter(adapter);
DataStruct.getStruct().setAdapter((new DBadapter(context, verCode)));
if (!DataStruct.getStruct().getPrefObj().checkVersionInfo()
|| !DataStruct.getStruct().getPrefObj().checkAccDataExists()) {
Intent accountActivity = new Intent(context,
CreateAccountActivity.class);
startActivity(accountActivity);
}
DataStruct.getStruct().getSavedRecords();
startActionOnTimer();
start.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (checkNetWorkState()) {
progressDialog = new ProgressDialog(v.getContext());
progressDialog.setIndeterminate(true);
progressDialog.setCancelable(false);
handler = new Handler() {
@Override
public void handleMessage(Message message) {
switch (message.what) {
case WaitResponce.statusNumKeys.RESPONSE_FAILED:
stopMFDialog(String.valueOf(message.obj));
DataStruct.getStruct().getRequestObject()
.cancelQueue();
break;
case WaitResponce.statusNumKeys.RESPONSE_WAITING:
progressDialog.setMessage("Подождите...");
progressDialog.show();
break;
case WaitResponce.statusNumKeys.RESPONSE_OK:
stopMFDialog(String.valueOf(message.obj));
break;
default:
break;
}
}
};
if (DataStruct.getStruct().getListener()
.setHandler(handler)) {
DataStruct.getStruct().getReqParams()
.prepareParamForSelectReq();
DataStruct.getStruct().getListener().getEvent()
.onResponceStartWait();
}
}
}
});
LISTVIEW.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
HashMap<String, Object> itemHashMap = (HashMap<String, Object>) parent.getItemAtPosition(position);
String titleItem = itemHashMap.get(it_id).toString();
int a = Integer.parseInt(titleItem);
detail.putExtra("arg", a);
startActivity(detail);
}
});
}
private void showMessageDialog() {
String Doz = "";
for (int i = 0; i < DataStruct.getStruct().getMainListSize(); i++) {
String Kod1 = DataStruct.getStruct().getKodByid(i);
String Sut1 = DataStruct.getStruct().getSutByid(i);
for (int j = 0; j < OldDataStruct.getStruct().getMainListSize(); j++) {
String Kod2 = OldDataStruct.getStruct().getKodByid(j);
String Sut2 = OldDataStruct.getStruct().getSutByid(j);
if (Kod1.equals(Kod2)) {
if (Sut1.equals(Sut2)) {
} else {
Doz = Sut1.replaceFirst(Sut2, "");
String Address = DataStruct.getStruct().getAddressByid(i);
Address = Address.replace("city", "");
Address = Address.replace("street", "st.");
AlertDialog.Builder quitDialog = new AlertDialog.Builder(this);
quitDialog.setTitle(Address);
quitDialog.setMessage("Addition: " + Doz);
quitDialog.setNegativeButton("ОК",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
return;
}
});
quitDialog.show();
}
}
}
}
}
private void startActionOnTimer() {
Intent l_intent = new Intent(this, UpdateOnTimer.class);
PendingIntent l_pendingIntent = PendingIntent.getBroadcast(context, 0,
l_intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis(), delay_min, l_pendingIntent);
}
public static void stopMFDialog(String message) {
if (progressDialog != null) {
progressDialog.dismiss();
}
ShowMessage.Show(message);
}
public static void setViewAdapter(ArrayAdapter<HashMap<String, Object>> mAdapter) {
adapter = mAdapter;
LISTVIEW.setAdapter(adapter);
}
}
DataStruct.java代码：
public class DataStruct extends Application {
/**
* здесь собраны все функции для операции с массивом данных (заявок)
*/
private static DataStruct mStruct;
private RequestParams params;
private Map<Integer, Map<String, String>> mainDataList;
private DistrictDataAdapterStruct districtsList;
private Integer currCount;
private Integer currIndex;
private Pref pref;
private AddRequest request;
private String districtName;
private DBadapter dbAdapter;
private ArrayAdapter<HashMap<String, Object>> mAdapter;
private TasksFieldsNames fieldsNames;
private WaitResponce waitResponce;
private void setMainDataList(Map<Integer, Map<String, String>> list) {
mainDataList = list;
}
private ArrayAdapter<HashMap<String, Object>> getMainAdapter() {
return mAdapter;
}
public void setMAdapter(ArrayAdapter<HashMap<String, Object>> _mAdapter) {
mAdapter = _mAdapter;
}
public int getMainListSize() {
return mainDataList.size();
}
public Map<Integer, Map<String, String>> getMainDataList() {
return mainDataList;
}
public void setAdapter(DBadapter dbAdapter) {
this.dbAdapter = dbAdapter;
}
public void setCurrIndex(Integer i) {
currIndex = i;
}
public final DBadapter getAdapter() {
return dbAdapter;
}
public DistrictDataAdapterStruct getDistricstsList() {
return districtsList;
}
public WaitResponce getListener() {
return waitResponce;
}
@SuppressLint("UseSparseArrays")
public void getSavedRecords() {
Map<Integer, Map<String, String>> LIST = new HashMap<Integer, Map<String, String>>();
LIST = getAdapter().getSelectedRows();
if (LIST != null) {
setRecFromBase(LIST);
}
}
public Map<String, String> getRecById(Integer i) {
return mainDataList.get(i);
}
public String getAddressByid(Integer i) {
return mainDataList.get(i).get("Address").trim();
}
public String getSutByid(Integer i) {
return mainDataList.get(i).get("The essence of the application").trim();
}
public String getKodByid(Integer i) {
return mainDataList.get(i).get("Claim code").trim();
}
public String getHarakterByid(Integer i) {
return mainDataList.get(i).get("Nature of the application").trim();
}
public void setRequestQueue(RequestQueue queue) {
request = new AddRequest(queue);
}
public AddRequest getRequestObject() {
return request;
}
public void setPrefObj(SharedPreferences preferences) {
pref = new Pref(preferences);
}
public Pref getPrefObj() {
return pref;
}
public RequestParams getReqParams() {
return params;
}
public ArrayList<String> getAllRec() {
ArrayList<String> values = new ArrayList<String>(0);
Iterator<Map<String, String>> iterator = mainDataList.values().iterator();
while (iterator.hasNext()) {
values.addAll(iterator.next().values());
}
return values;
}
public void createDistrictsList() {
districtsList = new DistrictDataAdapterStruct();
}
public void setDistricts(ArrayList<Map<String, String>> items) {
final String idRaion = "kodDistrict";
final String valRaion = "District";
final String KolvoZayavok = "QuantityApplications";
createDistrictsList();
Iterator<Map<String, String>> iterator = items.iterator();
while (iterator.hasNext()) {
Map<String, String> item = iterator.next();
getDistricstsList().addItem(String.valueOf(item.get(valRaion)),
Integer.parseInt(item.get(KolvoZayavok)),
Integer.parseInt(item.get(idRaion)));
}
}
public void setRecFromBase(Map<Integer, Map<String, String>> LIST) {
if (LIST.size() > 0) {
setMainDataList(LIST);
currCount = mainDataList.size();
addItemsToMainAdapter();
}
}
//добавление значений в ListView
private void addItemsToMainAdapter() {
ArrayList<HashMap<String, Object>> items = new ArrayList<HashMap<String, Object>>(currCount);
for (int i = 0; i < currCount; i++) {
HashMap<String, Object> hm = new HashMap<String, Object>();
hm.put("Address",getAddressByid(i));
hm.put("Kod",getKodByid(i));
hm.put("Position",""+i);
items.add(hm);
}
mAdapter.addAll(items);
mAdapter.notifyDataSetChanged();
MainActivity.setViewAdapter(getMainAdapter());
}
//обновление значений в ListView
private void addItemToMainAdapter() {
if (getHarakterByid(currCount).equals("Sale of monitors")) {
HashMap<String, Object> hm = new HashMap<String, Object>();
hm.put("Address",getAddressByid(currCount));
hm.put("Kod",getKodByid(currCount));
hm.put("Position",""+currCount);
mAdapter.add(hm);
}
mAdapter.notifyDataSetChanged();
MainActivity.setViewAdapter(getMainAdapter());
}
public void setMainNode() {
currCount = mainDataList.size();
mainDataList.put(currCount, new LinkedHashMap<String, String>());
}
private void setChildNode(String key, String value) {
mainDataList.get(currCount).put(key, value.trim());
}
public void setREC(JSONObject unParseRec) {
setMainNode();
Iterator<Names> iterator = getFieldsNamesList().getNamesList();
while (iterator.hasNext()) {
Names item = iterator.next();
String val = unParseRec.optString(item.getUSName());
setChildNode(item.getRUSName(),
(val.isEmpty()) ? getFieldsNamesList().emptyValue : val);
}
addItemToMainAdapter();
}
public TasksFieldsNames getFieldsNamesList() {
return fieldsNames;
}
private DataStruct() {
currCount = 0;
districtName = null;
params = new RequestParams();
fieldsNames = new TasksFieldsNames();
waitResponce = new WaitResponce();
mainDataList = new LinkedHashMap<Integer, Map<String, String>>(currCount);
}
public static synchronized DataStruct getStruct() {
if (mStruct == null) {
mStruct = new DataStruct();
}
return mStruct;
}
private void replaceItems() {
if (currCount > 0) {
Map<Integer, Map<String, String>> map = new LinkedHashMap<Integer, Map<String, String>>(0);
Integer index = 0;
Iterator<Map<String, String>> items = mainDataList.values().iterator();
do {
Map<String, String> item = items.next();
map.put(index, item);
index++;
} while (items.hasNext());
mainDataList.clear();
setMainDataList(map);
}
}
public void deleteRec() {
getMainAdapter().remove(getMainAdapter().getItem(currIndex));
getMainAdapter().notifyDataSetChanged();
String task_code = getFieldsNamesList().getRUNameByTag(TasksFieldsNames.fields_name.task_code);
getAdapter().deleteRows(getRecById(currIndex).get(task_code));
mainDataList.remove(currIndex);
currCount = mainDataList.size();
replaceItems();
}
public void deleteAllRec() {
getMainAdapter().clear();
getMainAdapter().notifyDataSetChanged();
getAdapter().reCreateBase();
mainDataList.clear();
currCount = mainDataList.size();
}
public String getDistrictName() {
return districtName;
}
public void setDistrictName(String districtName) {
this.districtName = districtName;
}
}
答案
好的，首先，我建议使用RecyclerView而不是ListView。至于为什么，请看这个link。
请参阅Google的documentation，了解如何创建正确的列表。
您需要编写自定义适配器并将您的逻辑放在onBindViewHolder中
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
// your logic goes here
holder.mTextView.setText("some filtered data");
}
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