Question

我构建自定义arrayAdapter以向spinner显示进度条，我的xml for row是这样的

<ProgressBar
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/progressBar"
 style="?android:attr/progressBarStyle"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />

和我的自定义适配器

public class CustomAdapter extends ArrayAdapter 
{

    private Context mContext;

    public CustomAdapter(@NonNull Context context, int resource,int textViewResourceId) {
        super(context, resource,textViewResourceId);
        mContext = context;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        View row = inflater.inflate(R.layout.default_spinner_progress,parent,false);
        return row;
    }

    @Override
    public int getCount() {
        return 1;
    }
}

我初始化它

transferSpinner.setAdapter(new CustomAdapter(getContext(),R.layout.default_spinner_progress,R.id.progressBar));

我在堆栈跟踪中遇到此错误

E/AndroidRuntime: FATAL EXCEPTION: main
   Process: com..debug, PID: 9537
   java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView

Answer 1

使用BaseAdapter代替

public class CustomAdapter extends BaseAdapter {

    private Context mContext;

    public CustomAdapter(@NonNull Context context) {
        this.mContext = context;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (view == null) {
            LayoutInflater inflater = LayoutInflater.from(mContext);
            view = inflater.inflate(R.layout.default_spinner_progress, parent, false);
        }
        return view;
    }

    @Override
    public int getCount() {
        return 1;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }
}

使用：transferSpinner.setAdapter(new CustomAdapter(this));

来调用它

ArrayAdapter要求资源ID为自定义适配器中的TextView

1 个答案: