Question

我目前正在开发我的第一个Android应用程序，而且我遇到了一个奇怪的问题。好吧，我试图用TextView和ImageView创建一个自定义微调器，代码显然是正确的，但当我点击微调器选择项目应用程序粉碎...我尝试了很多代码和方法，但..仍然是同一个问题，当我检查Android监视器时，我发现此错误 E / ArrayAdapter：您必须为TextView提供资源ID ...

CustomAdapter.java：

this.UpdateAsync();

custom_spinner_row.xml

＆＃13;

public class CustomAdapter extends ArrayAdapter {

String[] spinnerTitles;
int[] spinnerImages;
String[] spinnerPopulation;
Context mContext;

public CustomAdapter(@NonNull Context context, @LayoutRes int resource) {
    super(context, resource);
}

public CustomAdapter(@NonNull Context context, String[] titles, int[] images, String[] population) {
    super(context, R.layout.custom_spinner_row);
    this.spinnerTitles = titles;
    this.spinnerImages = images;
    this.spinnerPopulation = population;
    this.mContext = context;
}

@Override
public int getCount() {
    return spinnerTitles.length;
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    ViewHolder mViewHolder = new ViewHolder();
    if (convertView == null) {
        LayoutInflater mInflater = (LayoutInflater) mContext.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = mInflater.inflate(R.layout.custom_spinner_row, parent, false);
        mViewHolder.mFlag = (ImageView) convertView.findViewById(R.id.ivFlag);
        mViewHolder.mName = (TextView) convertView.findViewById(R.id.tvName);
        mViewHolder.mPopulation = (TextView) convertView.findViewById(R.id.tvPopulation);
        convertView.setTag(mViewHolder);
    } else {
        mViewHolder = (ViewHolder) convertView.getTag();
    }
    mViewHolder.mFlag.setImageResource(spinnerImages[position]);
    mViewHolder.mName.setText(spinnerTitles[position]);
    mViewHolder.mPopulation.setText(spinnerPopulation[position]);

    return convertView;
}

@Override
public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    return super.getDropDownView(position, convertView, parent);
}

private static class ViewHolder {
    ImageView mFlag;
    TextView mName;
    TextView mPopulation;
}

＆＃13;

MainActivity

?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

<ImageView
  android:id="@+id/ivFlag"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:padding="5dp"
  app:srcCompat="@mipmap/ic_launcher" />

<TextView
  android:id="@+id/tvPopulation"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_below="@+id/tvName"
  android:layout_toEndOf="@+id/ivFlag"
  android:layout_toRightOf="@+id/ivFlag"
  android:padding="5dp"
  android:text="TextView"
  android:textStyle="bold" />

<TextView
  android:id="@+id/tvName"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_toEndOf="@+id/ivFlag"
  android:layout_toRightOf="@+id/ivFlag"
  android:padding="5dp"
  android:text="TextView"
  android:textColor="@color/colorAccent"
  android:textSize="20sp"
  android:textStyle="italic" />
</RelativeLayout>

Answer 1

@Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
            LayoutInflater mInflater = (LayoutInflater) mContext.
                    getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View view = mInflater.inflate(R.layout.custom_spinner_row, parent, false);

            ImageView imageView = (ImageView) convertView.findViewById(R.id.ivFlag);
            TextView nameTextView = (TextView) convertView.findViewById(R.id.tvName);
            TextView populationTextView = (TextView) convertView.findViewById(R.id.tvPopulation);
        imageView.setImageResource(spinnerImages[position]);
        nameTextView.setText(spinnerTitles[position]);
        populationTextView.setText(spinnerPopulation[position]);

        return view;
    }

自定义微调器错误：ArrayAdapter：您必须为TextView提供资源ID

1 个答案: