我创建了一个新活动，它应该读取文本文件中的元素，然后将它们显示为ListView，但是当我尝试通过在模拟器中单击其图标来启动活动时，我收到此错误消息：
不幸的是，应用已停止工作
我不明白为什么，因为项目似乎已经正确编译了？
PS：我尝试打开的活动是SortedLocationsListActivity。
Logcat错误消息：
02-04 13:51:32.340 2900-2900/fr.isima.android.tp1.tp1 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: fr.isima.android.tp1.tp1, PID: 2900
java.lang.RuntimeException: Unable to start activity ComponentInfo{fr.isima.android.tp1.tp1/fr.isima.android.tp1.tp2.SortedLocationsListActivity}: java.lang.NumberFormatException: Invalid long: "1400390852000A"
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NumberFormatException: Invalid long: "1400390852000A"
at java.lang.Long.invalidLong(Long.java:124)
at java.lang.Long.parse(Long.java:366)
at java.lang.Long.parseLong(Long.java:353)
at fr.isima.android.tp1.tp2.SortedLocationsListActivity.onCreate(SortedLocationsListActivity.java:37)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
这是我的SortedLocationsListActivity的一部分（我修改了onCreate方法）：
public class SortedLocationsListActivity extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_sorted_locations_list);
InputStream is = getResources().openRawResource(R.raw.locations);
BufferedReader in = new BufferedReader(new InputStreamReader(is));
List<String> maListe = new ArrayList<String>();
String myligne;
LocationAdapter adapter = new LocationAdapter(this, R.layout.row_location);
try {
while((myligne = in.readLine()) != null)
{
String a[] = myligne.split(";");
Long _date=Long.parseLong(a[2], 36);
System.out.println(a[0]+" "+a[1]+" "+a[2]);
adapter.addLocation(a[0],a[1],_date);
}
setListAdapter(adapter);
}
catch(IOException e)
{
System.out.println("Error");
}
}
好的，导致问题的代码是：
Long _date=Long.parseLong(a[2], 36);
基本上我想要做的就是转换String，这可能是＆＃34; 1400390852000A＆＃34;例如，对于Long类型，我该如何正确地完成它？
好的，我更正了错误并且我设法启动了活动，但它只显示一个空白屏幕而不是我想要的列表，这是我编码的适配器：
public class LocationAdapter extends BaseAdapter {
private List<Location> Locations;
int monLayout;
LayoutInflater inflater;
public LocationAdapter(Context context, int layout){
monLayout=layout;
inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Locations = new ArrayList<Location>();
}
private class Location{
public String name;
public String address;
public Long date;
public Location(String _name,String _address , Long _date){
name=_name;
address=_address;
date=_date;
}
}
private class ViewHolder{
TextView name_view;
TextView address_view;
TextView date_view;
public ViewHolder(View rowLayout){
name_view = (TextView)rowLayout.findViewById(R.id.name);
date_view = (TextView)rowLayout.findViewById(R.id.date);
address_view = (TextView)rowLayout.findViewById(R.id.address);
}
}
public void addLocation(String _name,String _address,Long _date){
//Création d'une nouvelle location avec les données en paramètres
Location new_loc = new Location(_name, _address,_date);
//Ajout de la location à la liste des locations
Locations.add(new_loc);
}
/*Méthodes de la classe mère*/
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View view = convertView;
if (view == null)
view = inflater.inflate(monLayout, parent, false);
ViewHolder holder = (ViewHolder)view.getTag();
if (holder == null)
{
holder = new ViewHolder(view);
view.setTag(holder);
}
Location location = (Location)getItem(position);
holder.name_view.setText(location.name);
holder.address_view.setText(location.address);
holder.date_view.setText("Test");
return view;
}
}
有人可以告诉我问题可能来自哪里吗？
答案 0 :(得分：1)
原因是这个＆gt;＆gt; java.lang.NumberFormatException：无效长：“1400390852000A”
您正尝试在活动中将字符串类型转换为Long.parseLong。纠正这个并且它会起作用。
字符串值＆gt;＆gt; 1400390852000A，无法转换为Long。
检查你的SortedLocationsListActivity行号37. Bug就在那里，杀了它：）
答案 1 :(得分：0)
查看SortedLocationsListActivity第37行。
它看起来像一个NumberFormatException：无效长：“1400390852000A”。
检查参数：
Long _date=Long.parseLong(a[2], 36);