android - 如何在 RecyclerView Adapter 中使用 Activity 方法？

Question

每当 Recyclerview onclick 完成时，我需要完成一个 Activity 并重新打开另一个 Activity。我已经成功地在 Recyclerview 上实现了 onclick。但是我无法在我的适配器中重新创建另一个 Activity 。

我该如何解决这个问题？

public class ThemeAdapter extends RecyclerView.Adapter<ThemeAdapter.MyVH> {

    private final LayoutInflater inflater;
    private List<Theme> ThemeList;

    public ThemeAdapter(Context context, List<Theme> ThemeList){
        inflater = LayoutInflater.from(context);
        this.ThemeList = ThemeList;
    }

    @Override
    public MyVH onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.theme_card, parent, false);
        MyVH holder = new MyVH(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyVH holder, int position) {
        Theme current = ThemeList.get(position);
        holder.name.setText(current.Name);
        holder.mCardView.setCardBackgroundColor(Color.parseColor(current.Color));
    }

    @Override
    public int getItemCount() {
        return ThemeList.size();
    }

    class MyVH extends RecyclerView.ViewHolder implements View.OnClickListener {

        me.arulnadhan.robototextview.widget.RobotoTextView name;
        CardView mCardView;
        Context context;

        public MyVH(View itemView) {
            super(itemView);
            context = itemView.getContext();
            itemView.setOnClickListener(this);
            name= (me.arulnadhan.robototextview.widget.RobotoTextView) itemView.findViewById(R.id.Theme);
            mCardView = (CardView)itemView.findViewById(R.id.ThemeCard);
        }

        @Override
        public void onClick(View view) {

            switch (getAdapterPosition()){
                case 1:
                    Utility.setTheme(context, 1);
                    ThemeActivity.recreateActivity();
            }

public void recreateActivity() {
    finish();
    final Intent intent = IntentCompat.makeMainActivity(new ComponentName(this, MainActivity.class));
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | IntentCompat.FLAG_ACTIVITY_CLEAR_TASK);
    startActivity(intent);
}
        }
    }
}

Answer 1

您可以在构造函数中传递对 Activity 的引用，如下所示:

(...)
private final LayoutInflater inflater;
private List<Theme> ThemeList;

private final Activity mActivity;

public ThemeAdapter(Context context, Activity mActivity, List<Theme> ThemeList){
    inflater = LayoutInflater.from(context);
    this.ThemeList = ThemeList;

    this.mActivity = mActivity;
}
(...)

然后，在创建适配器时在您的 Activity 中执行如下操作:

ThemeAdapter adapter = new ThemeAdapter(getContext(), this, mThemeList);

然后您可以通过调用 mActivity.someMethod() 在您的适配器中使用 Activity 方法。

免责声明:未经测试(我从未使用过 RecyclerView)，但这在其他任何地方都有效。