我正在制作一个屏幕，我想在其中显示SQlite表中的数据。 调试我能看到的是，当涉及到listView.setAdapter（适配器）时，数据会进入适配器但不会填充在listview中。 （我正在使用自定义适配器，自定义列表项）
也没有出现任何错误。
请帮忙。我在下面发布我的代码。
place_list_item：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="1.0">
<TextView
android:id="@+id/serial_number_textview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.2"
android:padding="5dp"
android:text="1"
android:textColor="@color/common_signin_btn_default_background"
android:textSize="16sp" />
<TextView
android:id="@+id/duration_textview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.4"
android:padding="5dp"
android:text="hello"
android:textColor="@color/common_signin_btn_default_background"
android:textSize="16sp" />
<TextView
android:id="@+id/distance_textview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.4"
android:padding="5dp"
android:text="hello"
android:textColor="@color/common_signin_btn_default_background"
android:textSize="16sp" />
</LinearLayout>
trip_history_screen：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#dbeaf8"
android:orientation="vertical"
android:weightSum="1.0">
<LinearLayout
android:id="@+id/heading_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="#000000"
android:gravity="center_horizontal">
<TextView
android:id="@+id/header_label_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="Trip Histroy"
android:textColor="@android:color/white"
android:textSize="18dp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="@+id/titles_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/heading_layout"
android:orientation="horizontal"
android:weightSum="1.0">
<TextView
android:id="@+id/serial_number_title_textview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.2"
android:padding="5dp"
android:text="No."
android:textSize="16sp" />
<TextView
android:id="@+id/duration_title_textview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.4"
android:padding="5dp"
android:text="Duration"
android:textSize="16sp" />
<TextView
android:id="@+id/distance_title_textview_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.4"
android:padding="5dp"
android:text="Distance"
android:textSize="16sp" />
</LinearLayout>
<ListView
android:id="@+id/trip_history_listview_id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/titles_layout"
android:layout_marginBottom="50dp"
android:cacheColorHint="#00000000"
android:divider="@drawable/listview_devider_dockets"
android:dividerHeight="2dp"
android:paddingTop="10dp" />
</LinearLayout>
适配器：
import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import com.RareMediaCompany.MuditaMileage.DataClasses.ListData;
import com.RareMediaCompany.MuditaMileage.R;
import java.util.ArrayList;
import java.util.List;
/**
* Created by SANGEETA on 17-08-2015.
*/
public class TripHistoryDataAdapter extends ArrayAdapter {
List list = new ArrayList();
private Typeface typeface;
Context mContext;
int resource;
//public TripHistoryDataAdapter(Context context, int resource, Typeface typeface) {
// this.mContext = context;
// this.resource = resource;
// this.typeface = typeface;
//
// // super(context, resource);
//}
public TripHistoryDataAdapter(Context context, int resource) {
super(context, resource);
}
static class DataHandler {
TextView number;
TextView duration;
TextView distanceCovered;
}
@Override
public void add(Object object) {
super.add(object);
list.add(object);
}
@Override
public int getCount() {
return this.list.size();
}
@Override
public Object getItem(int position) {
return this.list.get(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row;
row = convertView;
DataHandler handler;
Log.i("LstAdapter", "Inside getView");
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.place_list_item, parent, false);
handler = new DataHandler();
handler.number = (TextView) row.findViewById(R.id.serial_number_textview_id);
handler.duration = (TextView) row.findViewById(R.id.duration_textview_id);
handler.distanceCovered = (TextView) row.findViewById(R.id.distance_textview_id);
row.setTag(handler);
} else {
handler = (DataHandler) row.getTag();
}
ListData historyDataProvider;
historyDataProvider = (ListData) this.getItem(position);
handler.number.setText(historyDataProvider.getNumber());
handler.duration.setText(historyDataProvider.getTime());
handler.distanceCovered.setText(historyDataProvider.getDistance());
return row;
}
}
片段：
public class TripHistoryFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
// private static final String ARG_PARAM1 = "param1";
// private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private MyDbHelper helper;
private ListView listView;
private TextView serialNumberTitle, timeTitle, distanceCoveredTitle;
private TextView headerTextView;
private List<ListData> dataList;
private TripHistoryDataAdapter adapter;
private Typeface typeface;
private GetDataTask getDataTaskObj;
// private OnFragmentInteractionListener mListener;
public TripHistoryFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.trip_history_screen, container, false);
typeface = Typeface.createFromAsset(getActivity().getAssets(),
"fonts/AvantGarde.ttf");
listView = (ListView) rootView.findViewById(R.id.trip_history_listview_id);
serialNumberTitle = (TextView) rootView.findViewById(R.id.serial_number_title_textview_id);
timeTitle = (TextView) rootView.findViewById(R.id.duration_title_textview_id);
distanceCoveredTitle = (TextView) rootView.findViewById(R.id.distance_title_textview_id);
headerTextView = (TextView) rootView.findViewById(R.id.header_label_id);
adapter = new TripHistoryDataAdapter(getActivity(), R.layout.place_list_item);
serialNumberTitle.setTypeface(typeface);
timeTitle.setTypeface(typeface);
distanceCoveredTitle.setTypeface(typeface);
headerTextView.setTypeface(typeface);
getDataTaskObj = new GetDataTask(getActivity());
// listView.setAdapter(adapter);
if (android.os.Build.VERSION.SDK_INT >= 11) {
// allows task to run parallely
getDataTaskObj.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
(Void[]) null);
} else {
getDataTaskObj.execute();
}
return rootView;
}
public class GetDataTask extends AsyncTask<Void, Void, Void> {
Context context;
Dialog dialog;
// ProgressDialog progressDialog;
public GetDataTask(Context context) {
this.context = context;
dialog = Utils.showValidationDialog(context, "Loading ...",
"Please wait ", false);
// listDataArr = new ArrayList<ListData>();
}
@Override
protected Void doInBackground(Void... params) {
helper = new MyDbHelper(getActivity());
Cursor cursor = helper.getAllLocationSavedCursor();
//String myHexColor = "#CC2233";
if (cursor.moveToFirst()) {
do {
String number = cursor.getString(cursor.getColumnIndex("id"));
String duration = cursor.getString(cursor.getColumnIndex("UnixTimeStamp"));
String distance = cursor.getString(cursor.getColumnIndex("distance"));
adapter.add(new ListData(number, duration, distance));
//list.add(map);
} while (cursor.moveToNext());
cursor.close();
}
return null;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(Void aVoid) {
if (adapter != null && !adapter.isEmpty()) {
listView.setAdapter(adapter);
Toast.makeText(getActivity(), "Running trip data is here", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity(), "No History Found!!", Toast.LENGTH_SHORT).show();
}
super.onPostExecute(aVoid);
}
}
}
如果有人发现某事或需要更多信息，请告诉我。
答案 0 :(得分：0)
更改trip_history_Screen.xml的线性布局。使用此
<LinearLayout
> android:id="@+id/titles_layout"
> android:layout_width="match_parent"
> android:layout_height="wrap_content"
> android:layout_below="@+id/heading_layout"
> android:orientation="horizontal"
> android:weightSum="1.0">
而不是：
<LinearLayout
android:id="@+id/titles_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/heading_layout"
android:orientation="horizontal"
android:weightSum="1.0">