所以除了 Android / Java 之外，我还有一个有趣的小列表适配器。它首先编写了一个由扫描仪拾取的 RFID 标签的简单列表。扫描仪附带的API使这一部分变得非常简单。它后来演变为获取与扫描程序通过需要使用标记ID本身构建的URL获取的标记关联的 JSON 对象。
快进到今天，我现在正试图找出一种方法来过滤已完成的列表项，但我需要通过标记的“状态”来完成;不是实际的10位数字符串'tagTitle'。不幸的是，我现在设置的工作微调器过滤器只是通过'tagTitle'来实现，因为我无法弄清楚如何访问其他两个TextView以将它们用作约束。但是，微调器使用的数组中填充了我们系统中的所有可能状态。很明显，我选择的任何过滤器选择，列表都是空白的。
话虽如此，任何帮助我到Point-B的帮助都将非常感激。如果有更多信息我应该包括在内，请告诉我。感谢。
public class rfid_status extends UgiUiActivity implements
UgiInventoryDelegate,
UgiInventoryDelegate.InventoryDidStopListener,
UgiInventoryDelegate.InventoryTagFoundListener {
public UgiRfidConfiguration rfidConfig;
public EPCAdapter epcAdapter;
public List<UgiTag> tagArray = new ArrayList<>();
public RequestQueue rQ;
public Spinner tagSearch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rfid_status);
ListView tagListView = (ListView) findViewById(R.id.tagList);
String[] statStrings = {
"",
"In",
"Filled",
"Out",
"Repair",
"Lost",
"QC",
"Missing",
"Sold",
"In Transfer"
};
ArrayAdapter<String> statusArray = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, statStrings);
tagSearch = (Spinner) findViewById(R.id.tagSearch);
tagSearch.setAdapter(statusArray);
tagSearch.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String constraint = parent.getItemAtPosition(position).toString();
epcAdapter.getFilter().filter(constraint);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// Do Nothing
}
});
this.setDisplayDialogIfDisconnected(true);
UgiTitleView titleView = (UgiTitleView) findViewById(R.id.status_title);
titleView.setTheTitle(getResources().getString(R.string.status_title));
this.configureTitleViewNavigation(titleView);
titleView.setBatteryStatusIndicatorDisplayVersionInfoOnTouch(true);
titleView.setUseBackgroundBasedOnUiColor(true);
titleView.setThemeColor(ContextCompat.getColor(this, msq_black));
titleView.setTextColorOnThemeColor(ContextCompat.getColor(this, msq_red));
titleView.setDisplayWaveAnimationWhileScanning(true);
rQ = Volley.newRequestQueue(this);
rfidConfig = UgiRfidConfiguration.INVENTORY_SHORT_RANGE;
epcAdapter = new EPCAdapter(this);
tagListView.setAdapter(epcAdapter);
updateUI();
}
public class EPCAdapter extends BaseAdapter implements Filterable {
rfid_status rfidStatus;
List<UgiTag> origTags;
EPCAdapter(rfid_status rfidStatus) {
super();
this.rfidStatus = rfidStatus;
}
class TagHolder {
TextView tagNumber, tagDetails, tagStatus;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public int getCount() {
return tagArray.size();
}
@Override
public Object getItem(int position) {
return position < tagArray.size() ? tagArray.get(position) : null;
}
@Override
public long getItemId(int position) {
return position < tagArray.size() ? tagArray.get(position).getEpc().hashCode() : 0;
}
@SuppressLint("InflateParams")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final TagHolder tagHolder;
final UgiTag ugiTag = tagArray.get(position);
final String tagTitle = ugiTag.toString().substring(14);
Uri.Builder jsonBuild = new Uri.Builder();
jsonBuild.scheme("http").authority("thirdstreamv2").appendPath("utilities").appendPath("HandheldGreenScreen").appendQueryParameter("assetid", tagTitle);
String jsonURL = jsonBuild.build().toString();
if (convertView == null) {
convertView = LayoutInflater.from(rfid_status.this).inflate(R.layout.tag_row, null);
tagHolder = new TagHolder();
tagHolder.tagNumber = (TextView) convertView.findViewById(R.id.tagHere);
tagHolder.tagStatus = (TextView) convertView.findViewById(R.id.statHere);
tagHolder.tagDetails = (TextView) convertView.findViewById(R.id.descHere);
convertView.setTag(tagHolder);
} else {
tagHolder = (TagHolder) convertView.getTag();
}
JsonObjectRequest jObj = new JsonObjectRequest(Request.Method.GET, jsonURL, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
String displayIf = response.getString("display");
if (!displayIf.equals("true")) {
tagArray.remove(ugiTag);
notifyDataSetChanged();
} else {
tagHolder.tagNumber.setText(tagTitle);
tagHolder.tagStatus.setText(response.getString("status"));
// I need to filter by the above somehow...
tagHolder.tagDetails.setText(response.getString("description"));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
rQ.add(jObj);
return convertView;
}
@Override
public Filter getFilter() {
return new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
tagArray = (List<UgiTag>) results.values;
notifyDataSetChanged();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
List<UgiTag> filteredTags = new ArrayList<>();
constraint = constraint.toString();
if (origTags == null) {
origTags = new ArrayList<>(tagArray);
}
if (constraint.length() == 0) {
results.count = origTags.size();
results.values = origTags;
} else {
for (int position = 0; position < origTags.size(); position++) {
UgiTag ugiTag = origTags.get(position);
String tagString = ugiTag.toString().substring(14);
if (tagString.contains(constraint)) {
filteredTags.add(ugiTag);
}
}
results.count = filteredTags.size();
results.values = filteredTags;
}
return results;
}
};
}
}
答案 0 :(得分：0)
没关系，自己回答。我删除了我的旧数组并使用我放在一起存储JSON响应的自定义对象创建了一个新数组，而不是仅列出RFID标签（UgiTag）。当值在对象中时，我现在可以在过滤器中访问它们并将其用作约束。
public class EPCAdapter extends BaseAdapter implements Filterable {
rfid_status rfidStatus;
List<TagInfo> origTags = null;
EPCAdapter(rfid_status rfidStatus) {
super();
this.rfidStatus = rfidStatus;
}
class TagHolder {
TextView tagNumber, tagDetails, tagStatus;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public int getCount() {
return tagList.size();
}
@Override
public Object getItem(int position) {
return position < tagList.size() ? tagList.get(position) : null;
}
@Override
public long getItemId(int position) {
return position < tagList.size() ? tagList.get(position).hashCode() : 0;
}
@SuppressLint("InflateParams")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final TagInfo tagItem = tagList.get(position);
final String tagTitle = tagItem.getUgiTag().toString().substring(14);
final TagHolder tagHolder;
Uri.Builder jsonBuild = new Uri.Builder();
jsonBuild.scheme("http").authority("thirdstreamv2").appendPath("utilities").appendPath("HandheldGreenScreen").appendQueryParameter("assetid", tagTitle);
String jsonURL = jsonBuild.build().toString();
if (convertView == null) {
convertView = LayoutInflater.from(rfid_status.this).inflate(R.layout.tag_row, null);
tagHolder = new TagHolder();
tagHolder.tagNumber = (TextView) convertView.findViewById(R.id.tagHere);
tagHolder.tagStatus = (TextView) convertView.findViewById(R.id.statHere);
tagHolder.tagDetails = (TextView) convertView.findViewById(R.id.descHere);
convertView.setTag(tagHolder);
} else {
tagHolder = (TagHolder) convertView.getTag();
}
JsonObjectRequest jObj = new JsonObjectRequest(Request.Method.GET, jsonURL, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
tagItem.setTagStatus(response.getString("status"));
tagItem.setTagDescription(response.getString("description"));
tagItem.setTagDisplay(response.getString("display"));
tagHolder.tagNumber.setText(tagTitle);
tagHolder.tagStatus.setText(tagItem.getTagStatus());
tagHolder.tagDetails.setText(tagItem.getTagDescription());
if (!tagItem.getTagDisplay().equals("true")) {
tagList.remove(tagItem);
notifyDataSetChanged();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
rQ.add(jObj);
return convertView;
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
List<TagInfo> filteredTags = new ArrayList<>();
constraint = constraint.toString();
if (origTags == null) {
origTags = new ArrayList<>(tagList);
}
if (constraint.length() == 0) {
results.count = origTags.size();
results.values = origTags;
} else {
for (int position = 0; position < origTags.size(); position++) {
TagInfo origPos = origTags.get(position);
String tagString = origPos.getTagStatus();
if (tagString.contains(constraint)) {
filteredTags.add(origPos);
}
}
results.count = filteredTags.size();
results.values = filteredTags;
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
tagList = (List<TagInfo>) results.values;
notifyDataSetChanged();
}
};
}
}