カスタム ArrayAdapter で ListFragment をインフレートするにはどうすればよいですか? 「所有者と車」の 2 つのクラスがあります。ユーザーは所有者を検索し、ListFragments を使用して所有者を表示します。さらに、ユーザーが所有者をクリックすると、その所有者が所有する車の詳細リストが表示されます。次のクラス/ヘルパー クラスを作成しました (CarDetail と OwnerDetail – これら 2 つのクラスは ListFragment を拡張し、People は FragmentActivity を拡張し、CarAdapter と OwnerAdapter カスタム アダプター、CarAsyncTask と OwnerAsyncTask AsyncTasks、およびアクティビティを拡張する Login を拡張します)。login クラスを使用すると、ユーザーはログインして所有者を検索できます。ユーザーがログインして検索を行うと、1 人以上の所有者がレイアウトの上部セクションに表示されます。しかし、私はそれを表示することができませんでした。ここに私のコードがあります：
// 07/30 @10:50 AM に更新 OwnerActivityAdapter を使用するように OwnerDetail onActivityCreated を更新しました。ただし、ホルダーに TextView を設定すると、例外がスローされます。下部の例外を参照してください。
簡単にするために、テキストの一部のみを表示します。
//Car Class
public class Car {
private String _make;
private String _model;
private String _year;
public Car(String make, String model, String year)
{
this._make = make;
this._model = model;
this._year = year;
}
}
//Owner Class
public class Owner {
private String _firstName;
private String _lastName;
private String _carId;
private Car _car;
public Owner(String lName, String fName, String cId, Car car)
{
this._lastName = lName;
this._firstName = fName;
this._carId = cId;
this._car = car;
}
}
package com.mb.carlovers;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
//Car Detail
public class CarDetail extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.customize_layout,container,false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
String[] myCars = {};
super.onActivityCreated(savedInstanceState);
ArrayAdapter<String> carAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_activated_1, myCars);
setListAdapter(carAdapter);
}
}
//OnwerDetail class
public class OwnerDetail extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.customize_layout,container, false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//Updated on 07/30 @10:50 AM
//Change this class to use the OwnerAsyncTask()
OnwerAsyncTask asynTask = new OnwerAsyncTask();
List<Owner> lt = null;
try {
lt = asynTask.execute("").get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Owner myOwners[] = lt.toArray(new Owner[lt.size()]);
super.onActivityCreated(savedInstanceState);
OwnerAdapter ownerAdapter = new OwnerAdapter(getActivity(),android.R.layout.simple_list_item_activated_1 , myOwners);
setListAdapter(ownerAdapter);
}
//People where the new Fragment should be created
public class People extends FragmentActivity implements OnClickListener, OnItemSelectedListener {
private Button search;
private EditText etSearchBy, etSearchByID;
private Spinner spOption;
private String selectedOption = null;
private TextView tvErrorMessage;
@Override
protected void onCreate(Bundle arg0) {
super.onCreate(arg0);
setContentView(R.layout.people);
InitializeVariables();
}
private void InitializeVariables()
{
etSearchBy = (EditText) this.findViewById(R.id.etByLastName);
etSearchByID = (EditText) this.findViewById(R.id.etCarID);
spOption = (Spinner) this.findViewById(R.id.spOption);
search = (Button) this.findViewById(R.id.bSearch);
search.setOnClickListener(this);
tvErrorMessage = (TextView) this.findViewById(R.id.tvErrorMessage);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,R.array.spOptions, android.R.layout.simple_spinner_dropdown_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spOption.setAdapter(adapter);
spOption.setOnItemSelectedListener(this);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
@Override
protected void onPause() {
super.onPause();
}
@Override
public void onClick(View v) {
String searchByName = etSearchBy.getText().toString();
String searchById = etSearchByID.getText().toString();
if(selectedOption == null || selectedOption == "All")
{
if(searchByName.matches("") || searchById.matches(""))
{
tvErrorMessage.setText("You must select a last name and car id");
} else
{
}
} else if(selectedOption == "Name")
{
if(!searchByName.matches(""))
{
try
{
**//Here is the List of information that I need to inflate the fragment with.**
OnwerAsyncTask ownerAsyncTask = new OnwerAsyncTask();
List<Owner> owner = ownerAsyncTask.execute("").get();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else
{
tvErrorMessage.setText("You must enter the last name of the owner.");
}
} else if (selectedOption == "ID")
{
if(!searchById.matches(""))
{
String st = null;
String d = st;
} else
{
tvErrorMessage.setText("You must enter the car id that you'd like to search.");
}
}
}
//Owner Adapter – (The Car Adapter looks similar to this except the variables name are different.)
public class OwnerAdapter extends ArrayAdapter<Owner> {
private Context context;
private int layoutResourceId;
private Owner data[] = null;
public OwnerAdapter(Context context, int resource, int textViewResourceId,Owner[] data) {
super(context, resource, textViewResourceId, data);
this.context = context;
this.layoutResourceId = resource;
this.data = data;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
OwnerHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new OwnerHolder();
holder.tvFirstName = (TextView) row.findViewById(R.id.tvFirstName);
holder.tvLastName = (TextView) row.findViewById(R.id.tvLastName);
holder.tvCarId = (TextView) row.findViewById(R.id.tvCarID);
row.setTag(holder);
} else
{
holder = (OwnerHolder) row.getTag();
}
Owner item = data[position];
**//Updated on 07/30 @10:50 AM
// Below is where I am getting the exception**
holder.tvFirstName.setText(item.getFirstName().toString());
holder.tvLastName.setText(item.getLastName().toString());
holder.tvCarId.setText(item.getCarId().toString());
return row;
}
static class OwnerHolder
{
TextView tvFirstName;
TextView tvLastName;
TextView tvCarId;
}
}
//Owner AsyncTask –(CarAsyncTask is also similar)
public class OnwerAsyncTask extends AsyncTask<String, Void, List<Owner>> {
private List<Owner> items = null;
@Override
protected List<Owner> doInBackground(String... params) {
try
{
items = new ArrayList<Owner>();
items.add(new Owner("John", "Smith", "1"));
items.add(new Owner("Samantha", "Right", "2"));
items.add(new Owner("Regie", "Miller", "3"));
items.add(new Owner("Mark", "Adam", "4"));
} catch(Exception ex)
{
ex.toString();
}
return items;
}
@Override
protected void onPostExecute(List<Owner> result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
}
}
//My customize Layout for the listfragment
<?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="vertical" >
<ListView
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
<TextView
android:id="@id/android:empty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="No record to be displayed." />
</LinearLayout>
// 07/30 @10:50 AM に更新 // ここに例外があります
07-30 14:18:15.155: E/AndroidRuntime(864): 致命的な例外: メイン 07-30 14:18:15.155: E/AndroidRuntime(864): java.lang.NullPointerException 07-30 14:18:15.155: E/AndroidRuntime(864): com.mb.carlovers.adapter.OwnerAdapter.getView(OwnerAdapter.java:48) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.AbsListView.obtainView で(AbsListView.java:2033) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.ListView.onMeasure(ListView.java:1127) 07-30 14:18:15.155: E/AndroidRuntime (864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) で07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) で 07-30 14:18:15.155: E/AndroidRuntime(864): Android で。ウィジェット。LinearLayout.measureVertical(LinearLayout.java:660) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java) :4677) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14 :18:15.155: E/AndroidRuntime(864): android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) で155: E/AndroidRuntime(864): android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View .java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14:18:15.155: E/AndroidRuntime(864) ): android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07- 30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget で。 LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)155: E/AndroidRuntime(864): android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View .java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14:18:15.155: E/AndroidRuntime(864) ): android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07- 30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget で。 LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java) :4677) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14 :18:15.155: E/AndroidRuntime(864): android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) でE/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java) :4677) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14 :18:15.155: E/AndroidRuntime(864): android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) でFrameLayout.onMeasure(FrameLayout.java:293) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java で:1369)FrameLayout.onMeasure(FrameLayout.java:293) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.View.measure(View.java:12603) 07-30 14:18:15.155: E/AndroidRuntime(864): android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677) 07-30 14:18:15.155: E/AndroidRuntime(864): android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java で:1369)