Question

正如标题中所提到的，我在RecyclerView里面需要填充20张图片。由于图片在drawable中可用，因此我尝试以adapter的{{1}}编程方式设置这些图片。

RecyclerView

现在，这显然不适用于Android工作室说：

错误的第二个参数类型。找到：'java.lang.String'，必需：'int'

为此，已存在一个解决方案：Setting Android images from string value

然而，当我尝试时：

    @Override
    public void onBindViewHolder(HomeTeamViewHolder homeTeamViewHolder, int i)
    {

        homeTeamViewHolder.teamName.setText(d1.teams.get(i));
        String str = "R.drawable.e0";

        homeTeamViewHolder.home_teams.setImageDrawable(ContextCompat.getDrawable(homeTeamViewHolder.mcontext,str));

    }

在int resourceId = Activity.getResources().getIdentifier("testimage", "drawable", "your.package.name");内：

onBindViewHolder()

Android Studio说：

无法从静态上下文引用非静态方法@Override public void onBindViewHolder(HomeTeamViewHolder homeTeamViewHolder, int i) { homeTeamViewHolder.teamName.setText(d1.teams.get(i)); //String str = "R.drawable.e0"; int resourceId = Activity.getResources().getIdentifier("testimage", "drawable", "your.package.name"); homeTeamViewHolder.home_teams.setImageDrawable(ContextCompat.getDrawable(homeTeamViewHolder.mcontext,resourceId)); }

所以，问题是：如何解决这个问题？

Answer 1

您可以在构造函数中将上下文传递给Adapter。然后，您可以通过该上下文访问getResources（）。

public class MyAdapter extends RecyclerView.Adapter<MyHolder> {

    ...

    private Context context;

    public MyAdapter(Context context, Other_arguments_you_need) {
        this.context = context;
        // set other arguments
    }

    ...

    @Override
    public void onBindViewHolder(HomeTeamViewHolder homeTeamViewHolder, int i)
    {

        homeTeamViewHolder.teamName.setText(d1.teams.get(i));
        int resourceId = context.getResources().getIdentifier("testimage", "drawable", "your.package.name");
        homeTeamViewHolder.home_teams.setImageDrawable(ContextCompat.getDrawable(homeTeamViewHolder.mcontext,resourceId));

    }
}

Answer 2

通过将上下文传递给适配器来修复它。

 Context mcontext = itemView.getContext();

然后，在onBindViewHolder()内：

@Override
public void onBindViewHolder(HomeTeamViewHolder homeTeamViewHolder, int i)
{

    homeTeamViewHolder.teamName.setText(d1.teams.get(i));
    String x = "e"+i;
    int resourceId = homeTeamViewHolder.mcontext.getResources().getIdentifier(x, "drawable", "com.udacity.yaafl");
    homeTeamViewHolder.home_teams.setImageDrawable(ContextCompat.getDrawable(homeTeamViewHolder.mcontext,resourceId));

}

Answer 3

通过此

获取资源的整数ID

  int resourceId = homeTeamViewHolder.itemView.getResources().getIdentifier("testimage", "drawable", "your.package.name");

如何使用String值以编程方式将图像设置为适配器内的ImageView？

3 个答案: