在适配器类中调用自定义对话框

Question

我创建了一个简单的Custom dialog 类，我想在单击RecycleView 中的一行后显示它。 我的对话框类看起来：

public class AddToQueueDialog extends Dialog implements View.OnClickListener {

 Activity mActivity;
private TextView textView1;
private TextView textView2;
private Button save;

public AddToQueueDialog(Activity activity){
    super(activity);
    mActivity = activity;
}

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.add_to_queue);
        textView1 = (TextView) findViewById(R.id.textView5);
        textView2 = (TextView) findViewById(R.id.textView6);
        save = (Button) findViewById(R.id.button4);
        save.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v.getId() == save.getId()){
            Log.d("save", "save");
        }
    }
}

我想知道如何正确调用 adapter 的 RecycleView 看起来： （片）

   public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {       
        public ViewHolder(Context context, View itemView, List<WashLocation> washLocations) {
            super(itemView);
            this.context = context;
            info = (TextView) itemView.findViewById(R.id.textView);
            favorite = (Button) itemView.findViewById(R.id.addToFav);
            favorite.setOnClickListener(this);
            info.setOnClickListener(this);
            this.washLocations = washLocations;
            dataBaseHelper = new DataBaseHelper(context);
        }

        @Override
        public void onClick(View v) {
            if(v.getId() == info.getId()){
                AddToQueueDialog addToQueueDialog = new AddToQueueDialog(MapsActivity.this);
                addToQueueDialog.show();
            }

在我的 Custom dialog 类中，我需要一个 Activity in arg 作为构造函数，但我不知道应该在 Adapter 类中传递哪个 Activity

Answer 1

只需将当前Activity 的context 传递给Adapter 类，并在创建AddToQueueDialog 的实例时使用它。

例如：

MainActivity.java

public class MainActivity extends AppCompatActivity {

    Context mContext;

    // Views
    RecyclerView mRecyclerView;

    // Values
    List<Recipe> mRecipeList;

    // Adapter
    RecipeAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mContext = this;

        // Views
        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        .................
        ..........................

        // Values
        mRecipeList = new ArrayList<Recipe>();

        // Adapter
        mAdapter = new RecipeAdapter(mContext, mRecipeList);

        // Set adapter to RecyclerView
        mRecyclerView.setAdapter(mAdapter);

        .................
        ..........................
   }
}  

RecipeAdapter.java

public class RecipeAdapter extends RecyclerView.Adapter<RecipeAdapter.ViewHolder> {

    Context mContext;
    LayoutInflater mInflater;

    // List
    List<Recipe> mRecipeList;

    public GroupListAdapter(Context context, List<Recipe> listRecipe) {

        this.mContext = context;
        this.mRecipeList = listRecipe;

        mInflater = LayoutInflater.from(mContext);
    }

    .....................
    ...............................

    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {       

        public ViewHolder(View itemView) {
            super(itemView);
            info = (TextView) itemView.findViewById(R.id.textView);
            favorite = (Button) itemView.findViewById(R.id.addToFav);

            favorite.setOnClickListener(this);
            info.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            if(v.getId() == info.getId()){
                AddToQueueDialog addToQueueDialog = new AddToQueueDialog(mContext);
                addToQueueDialog.show();
            }
       }
    }

    ............
    ......................
}

希望对你有帮助~

Answer 2

class MyAdapter extends RecyclerView.Adapter<VH> {

  // set this field through setter or constructor
  private OnClickListener mMyOnClickListener;

  ...

  void onBindViewHolder(..., VH viewHolder) {
    viewHolder.rootView.setOnClickListener(() -> {
       if (mOnClickListener != null) {
          mOnClickListener.onClick();
       }
     });
  }

  static class VH extends ViewHolder {
    View rootView;

    VH(View itemView) {
      super(itemView);
      rootView = itemView;
    }
  }
}

class MainActivity extends AppCompatActivity {

  ...

  void setUpRecyclerView(){
    ...
    adapter.setMyOnClickListener(() -> {
       new Dialog(MainActivity.this).show();
     });
  }
}