我是新android开发。我就读Udacity当然，我得到的地方，我必须使用一个服装arrayAdapter显示数据（文本）的一个ListView我钉的大部分，但我有显示数据的一个问题是：当我启动我的活动的ListView显示最后一个项目在可能的ArrayList我已经试过几乎所有他们的工作没有什么对我来说
我的数据
/**
* Displays text to the user.
*/
public class Numbers {
//First we Set the Stat of our Class :
// English Translation
public static String englishTranslation;
//Tamazight Translation
public static String tamazightTranslation;
/**
* Create a new Numbers Object :
*
* @param englishTranslation is for ENGLISH NUMBERS
* @param tamazightTranslation is for TAMAZIGHT NUMBERS
*/
//Constructor
public Numbers(String englishTranslation, String tamazightTranslation) {
this.englishTranslation = englishTranslation;
this.tamazightTranslation = tamazightTranslation;
}
//Getter
public static String getEnglishTranslation() {
return englishTranslation;
}
public static String getTamazightTranslation() {
return tamazightTranslation;
}
}
我的ArrayList：
public class ActivityNumbers extends AppCompatActivity {
//Add English numbers to The ARRAYList
ArrayList<Numbers> englishNumbers = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_numbers);
englishNumbers.add(new Numbers("One", "Yan"));
englishNumbers.add(new Numbers("Two", "Sin"));
englishNumbers.add(new Numbers("Three", "Krad"));
englishNumbers.add(new Numbers("Four", "Koz"));
englishNumbers.add(new Numbers("Five", "Smos"));
englishNumbers.add(new Numbers("Six", "Sdis"));
englishNumbers.add(new Numbers("Seven", "Sa"));
englishNumbers.add(new Numbers("Eight", "Tam"));
englishNumbers.add(new Numbers("Nine", "Tza"));
englishNumbers.add(new Numbers("Ten", "Mraw"));
//EnglishNumbers.remove(0);
//EnglishNumbers.size();
// EnglishNumbers.get(1);
//Create a NEW TV object
/**Creating an ArrayAdapter (DATA HOLDER)
@param Context / the ACTIVITY concerned
@param Android.R.layout : an XML layout file contains TextView predefined by Android
@param Items to display */
NumbersAdapter itemsAdapter = new NumbersAdapter (this, englishNumbers);
// Linking the ListView object to a Variable
ListView numbersListView = (ListView) findViewById(R.id.list);
//Calling setAdapter Method on numbersListView with "itemsAdapter
numbersListView.setAdapter(itemsAdapter);
}
}
我的适配器：
public class NumbersAdapter extends ArrayAdapter<Numbers> {
public NumbersAdapter(Context context, ArrayList<Numbers> englishNumbers) {
super(context, 0, englishNumbers);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(R.layout.listitem, parent, false);
}
Numbers numbers = getItem(position);
System.out.println(position);
TextView tamazight_item = (TextView) listItemView.findViewById(R.id.tamazight_item);
TextView english_item = (TextView) listItemView.findViewById(R.id.english_item);
tamazight_item.setText(numbers.getEnglishTranslation());
System.out.println(numbers.getEnglishTranslation());
english_item.setText(numbers.getTamazightTranslation());
System.out.println(numbers.getTamazightTranslation());
return listItemView;
}
}
你tamazightTranslation和englishTranslation属性对于Numbers类含义，这些都是类属性的静态。从变量和从干将删除static，你应该罚款。看到这里类属性和实例之间的区别属性https://docs.oracle.com/javase/tutorial/java/javaOO/classvars.html
试试这个方法
Context context;
ArrayList<Numbers> englishNumbers;
public NumbersAdapter(Context context, ArrayList<Numbers> englishNumbers)
{
this.context=context;
this.englishNumbers=englishNumbers;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
convertView= LayoutInflater.from(context).inflate(R.layout.listitem,parent,false);
TextView tamazight_item = (TextView) listItemView.findViewById(R.id.tamazight_item);
TextView english_item = (TextView) listItemView.findViewById(R.id.english_item);
tamazight_item.setText(englishNumbers.get(position).getEnglishTranslation());
english_item.setText(englishNumbers.get(position).getTamazightTranslation());
return convertView;
}
而且别忘了，使NumbersAdapter延伸BaseAdapter
我已经改变了你的模型类和适配器类，请按照此它将工作
public class Numbers {
//First we Set the Stat of our Class :
// English Translation
private String englishTranslation;
//Tamazight Translation
private String tamazightTranslation;
public String getEnglishTranslation() {
return englishTranslation;
}
public void setEnglishTranslation(String englishTranslation) {
this.englishTranslation = englishTranslation;
}
public String getTamazightTranslation() {
return tamazightTranslation;
}
public void setTamazightTranslation(String tamazightTranslation) {
this.tamazightTranslation = tamazightTranslation;
}
}
适配器类
public class NumbersAdapter extends ArrayAdapter<Numbers> {
private Context mContext;
private ArrayList<Numbers>list;
public NumbersAdapter(Context context, ArrayList<Numbers> englishNumbers) {
super(context, 0, englishNumbers);
this.mContext=context;
this.list = englishNumbers;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(mContext).inflate(R.layout.listitem, parent, false);
}
Numbers numbers = list.get(position);
System.out.println(position);
TextView tamazight_item = (TextView) listItemView.findViewById(R.id.tamazight_item);
TextView english_item = (TextView) listItemView.findViewById(R.id.english_item);
tamazight_item.setText(numbers.getEnglishTranslation());
System.out.println(numbers.getEnglishTranslation());
english_item.setText(numbers.getTamazightTranslation());
System.out.println(numbers.getTamazightTranslation());
return listItemView;
}
}
如果显示在你的ListView最后一个项目，可能有几个原因。
getCount()在ArrayAdapter有列表的大小。它可能会解决问题。如果显示在你的列表视图中的所有行相同的数据，那么它可能是
static关键字，static意味着属性或方法属于Number类，而不是你的电话号码类对象的实例。基本上，它必须是原因。