如何在自定义适配器中使用 String[]？

Question

我制作了一个自定义适配器，它应该调用自定义数组列表 java class，这样它将显示 3 个单独的字符串数组。但是，如果我将 String[] 放在自定义数组列表 java class 中，它将不适用于自定义适配器，因为 getitem(position) 需要 getArabic 的 int 类型。那我该怎么做呢？

这是我的自定义数组列表 java

public class Perrow {

    String[] Arabic;
    String[] transliteration;
    String[] translation;

    public Perrow(String[] arabic, String[] transliteration, String[] translation) {
        Arabic = arabic;
        this.transliteration = transliteration;
        this.translation = translation;
    }

    public String[] getArabic() {
        return Arabic;
    }

    public void setArabic(String[] arabic) {
        Arabic = arabic;
    }

    public String[] getTransliteration() {
        return transliteration;
    }

    public void setTransliteration(String[] transliteration) {
        this.transliteration = transliteration;
    }

    public String[] getTranslation() {
        return translation;
    }

    public void setTranslation(String[] translation) {
        this.translation = translation;
    }
}

和我的自定义适配器


public class PerrowAdapter extends ArrayAdapter<Perrow> {

    private Context mContext;
    private int mResource;



    public PerrowAdapter(@NonNull Context context, int resource, @NonNull ArrayList<Perrow> objects) {
        super(context, resource, objects);
        this.mContext = context;
        this.mResource = resource;

    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater layoutInflater = LayoutInflater.from(mContext);
        convertView = layoutInflater.inflate(mResource, parent, false);

        TextView arabictext = convertView.findViewById(R.id.arabictext);
        TextView transliteration = convertView.findViewById(R.id.transliteration);
        TextView translation = convertView.findViewById(R.id.translation);

        String[] arabica = getContext().getResources().getStringArray(R.array.fontsize);

        arabictext.setText(getItem(position).getArabic(arabica));
        transliteration.setText(getItem(position).getTransliteration());
        translation.setText(getItem(position).getTranslation());












        return convertView;
    }
}

非常感谢帮助谢谢大家

Answer 1

我认为您的问题是尝试将 array 设置为 TextView 的文本，如下面的代码。

arabictext.setText(getItem(position).getArabic(arabica));
transliteration.setText(getItem(position).getTransliteration());
translation.setText(getItem(position).getTranslation());

如果你想获取特定索引的字符串，你可以使用它的索引。例如：

arabictext.setText(getItem(position).getArabic()[0]);
transliteration.setText(getItem(position).getTransliteration()[0]);
translation.setText(getItem(position).getTranslation()[0]);

或者如果你想从 String[] 中获取所有值作为一个 String 并将其设置为你的 TextView 你可以创建一个方法来获取 String[] 和returns String.

private String getString(String[] array){
    String text = "";
    for (String s : array) {
        text += s + ", ";
    }
    return text;
}

所以在你的适配器中定义一个像上面那样的方法，当你需要来自 String[] 的 String 时使用那个方法。

public class PerrowAdapter extends ArrayAdapter<Perrow> {

    private Context mContext;
    private int mResource;
    private ArrayList<Perrow> objects;

    public PerrowAdapter(@NonNull Context context, int resource, @NonNull ArrayList<Perrow> objects) {
        super(context, resource, objects);
        this.mContext = context;
        this.mResource = resource;
        this.objects = objects;
    }

    private String getString(String[] array){
        String text = "";
        for (String s : array) {
            text += s + ", ";
        }
        return text;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater layoutInflater = LayoutInflater.from(mContext);
        convertView = layoutInflater.inflate(mResource, parent, false);

        TextView tvArabic = convertView.findViewById(R.id.arabictext);
        TextView tvTransliteration = convertView.findViewById(R.id.transliteration);
        TextView tvTranslation = convertView.findViewById(R.id.translation);

        Perrow perrow = objects.get(position);
        String[] arabica = perrow.getArabic();
        String[] transliteration = perrow.getTransliteration();
        String[] translation = perrow.getTranslation();

        tvArabic.setText(getString(arabica));
        tvTransliteration.setText(getString(transliteration));
        tvTranslation.setText(getString(translation));

        return convertView;
    }
}

编辑

i want as per row of the listview, show each item in the string array, >accordingly. how can this be achieved ?

您应该更改 Perrow class 而不是 String[] 使用 String 并使用 String[] 的每个元素填充 ArrayList .

Perrow.java（使用 String 而不是 String[]）

public class Perrow {
    String Arabic;
    String transliteration;
    String translation;

    public Perrow(String arabic, String transliteration, String translation) {
        Arabic = arabic;
        this.transliteration = transliteration;
        this.translation = translation;
    }

    public String getArabic() {
        return Arabic;
    }

    public void setArabic(String arabic) {
        Arabic = arabic;
    }

    public String getTransliteration() {
        return transliteration;
    }

    public void setTransliteration(String transliteration) {
        this.transliteration = transliteration;
    }

    public String getTranslation() {
        return translation;
    }

    public void setTranslation(String translation) {
        this.translation = translation;
    }
}

PerrowAdapter.java（Perrow class 中的 get() 方法现在 return String 因此您可以直接将它们用于 TextViews)

public class PerrowAdapter extends ArrayAdapter<Perrow> {

    private Context mContext;
    private int mResource;
    private ArrayList<Perrow> objects

    public PerrowAdapter(@NonNull Context context, int resource, @NonNull ArrayList<Perrow> objects) {
        super(context, resource, objects);
        this.mContext = context;
        this.mResource = resource;
        this.objects = objects;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater layoutInflater = LayoutInflater.from(mContext);
        convertView = layoutInflater.inflate(mResource, parent, false);

        TextView tvArabic = convertView.findViewById(R.id.arabictext);
        TextView tvTransliteration = convertView.findViewById(R.id.transliteration);
        TextView tvTranslation = convertView.findViewById(R.id.translation);

        Perrow perrow = objects.get(position);

        tvArabic.setText(perrow.getArabic());
        tvTransliteration.setText(perrow.getTransliteration());
        tvTranslation.setText(perrow.getTranslation());

        return convertView;
    }
}

我不知道你如何填充你的 String[] 但我假设所有三个 String[] 具有相同的长度（数组包含相同的数字 Strings），所以你可以添加所有Strings 使用 for 循环进入 ArrayList 并将 ArrayList 用于您的适配器。

你的Activiy（你在哪里调用PerrowAdapter）

String[] arabica = getContext().getResources().getStringArray(R.array.fontsize);
String[] trasliteration = ... //Get your trasliteration array
String[] translation = ... //Get your translation array

ArrayList<Perrow> list = new ArrayList<>();
for(int i = 0; i < arabica.length; i++){
    list.add(new Perrow(arabica[i], transliteration[i], translation[i]));
}

PerrowAdapter adapter = new PerrowAdapter(context, resource, list);

如何在自定义适配器中使用 String[]？

How to use String[] in custom adapter?

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