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，它应该调用定制的arraylist java类，这样它将显示3个独立的字符串数组。但是，如果我将String[]放在定制的arraylist java类中，它将无法使用自定义适配器，因为getitem( getArabic )将需要int类型的getArabic。那我该怎么做呢？

这是我的自定义数组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;
    }
}

非常感谢你们的帮助谢谢大家

Answer 1

我认为您的问题是试图像下面的代码一样将array设置为TextView文本。

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

如果要获取特定索引的字符串，只需使用它的索引即可。例如：

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

或者，如果您希望将String[]中的所有值作为一个String来获取，并将其设置为您的TextView，则可以创建一个获取String[]并返回String的方法。

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

因此，在适配器内部定义一个像上面这样的方法，每当您需要来自String[]的String[]时，就使用该方法。

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

作为列表视图的每一行，显示字符串数组中的每一项，>相应地。如何才能做到这一点？

您应该更改您的Perrow类，而不是String[]，使用String并使用String[]的每个元素填充您的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 (来自Perrow类的get()方法现在返回String，因此您可以直接将它们用于TextView)

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;
    }
}

我不知道如何填充您的String[]，但我假设所有三个String[]都有相同的长度(数组包含相同的数字Strings)，因此可以使用for循环将所有Strings添加到ArrayList中，并将ArrayList用作适配器。

您的Activiy (您在哪里叫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);