java - 如何在 recyclerview 适配器中创建 Intent Activity

Question

我想在点击缩略图时进行移动 Activity

但是当我在该部分中创建 Intent 函数时

 holder.thumbnail.setOnClickListener (new View.OnClickListener () {
            @Override
            public void onClick (View view) {

发生了错误，但如果使用 Toast 就可以..

如何处理？这是我在 PhotoAdapter.java 中的代码

import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.PopupMenu;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater; 
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import java.util.List;


public class PhotoAdapter extends RecyclerView.Adapter<PhotoAdapter.MyViewHolder> {

private Context mContext;
public List<Photo> PhotoList;

public PhotoAdapter(Context mContext, List<Photo> PhotoList) {
    this.mContext = mContext;
    this.PhotoList = PhotoList;
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView name, rating;
    public ImageView thumbnail, overflow;

    public MyViewHolder(View view) {
        super(view);
        name = (TextView) view.findViewById(R.id.name);
        rating= (TextView) view.findViewById(R.id.rating);
        thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
        overflow = (ImageView) view.findViewById(R.id.overflow);
    }


}

@Override
public PhotoAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.photo_card, parent, false);
    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(final PhotoAdapter.MyViewHolder holder, int position) {
    final Photo movie = PhotoList.get(position);
    holder.name.setText(movie.getName());
    holder.rating.setText("Tanggal Lahir : "+String.valueOf( movie.getRating()));


    Glide.with(mContext).load(movie.getThumbnail()).into(holder.thumbnail);

    holder.overflow.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showPopupMenu(holder.overflow);
        }
    });

    holder.thumbnail.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if(movie.getName()=="Aditya Nanda Utama"){
                Toast.makeText(mContext,"Anda memilih Saya",Toast.LENGTH_LONG).show();
            }else{
                Toast.makeText(mContext,"Anda memilih "+movie.getName(),Toast.LENGTH_LONG).show();
            }

        }
    });
}

@Override
public int getItemCount() {

    return PhotoList.size();
}


private void showPopupMenu(View view) {
    // inflate menu
    PopupMenu popup = new PopupMenu(mContext, view);
    MenuInflater inflater = popup.getMenuInflater();
    inflater.inflate(R.menu.menu_movie, popup.getMenu());

    popup.show();
}

}

Answer 1

您需要在适配器中创建一个接口(interface)，并让您的 Activity (您从哪里移动)实现它。该接口(interface)将有一个方法(监听器)，每当您单击缩略图时，都会使用 Activity 的实例(上下文)并从适配器中的接口(interface)调用该方法。您的 Activity 将由操作触发，并且在您的 Activity 中您将使用 Intent 。

见下文:

import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.PopupMenu;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater; 
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import java.util.List;


public class PhotoAdapter extends RecyclerView.Adapter<PhotoAdapter.MyViewHolder> {

private Context mContext;
public List<Photo> PhotoList;
public MyAdapterListener myAdapterListener;

public PhotoAdapter(Context mContext, List<Photo> PhotoList, MyAdapterListener myAdapterListener) {
    this.mContext = mContext;
    this.PhotoList = PhotoList;
    this.myAdapterListener = myAdapterListener;
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView name, rating;
    public ImageView thumbnail, overflow;

    public MyViewHolder(View view) {
        super(view);
        name = (TextView) view.findViewById(R.id.name);
        rating= (TextView) view.findViewById(R.id.rating);
        thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
        overflow = (ImageView) view.findViewById(R.id.overflow);
    }


}

@Override
public PhotoAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.photo_card, parent, false);
    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(final PhotoAdapter.MyViewHolder holder, int position) {
    final Photo movie = PhotoList.get(position);
    holder.name.setText(movie.getName());
    holder.rating.setText("Tanggal Lahir : "+String.valueOf( movie.getRating()));


    Glide.with(mContext).load(movie.getThumbnail()).into(holder.thumbnail);

    holder.overflow.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showPopupMenu(holder.overflow);
        }
    });

    holder.thumbnail.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            //notify listener:
            myAdapterListener.onThumbnailClick();
            if(movie.getName()=="Aditya Nanda Utama"){
                Toast.makeText(mContext,"Anda memilih Saya",Toast.LENGTH_LONG).show();
            }else{
                Toast.makeText(mContext,"Anda memilih "+movie.getName(),Toast.LENGTH_LONG).show();
            }

        }
    });
}

@Override
public int getItemCount() {

    return PhotoList.size();
}


private void showPopupMenu(View view) {
    // inflate menu
    PopupMenu popup = new PopupMenu(mContext, view);
    MenuInflater inflater = popup.getMenuInflater();
    inflater.inflate(R.menu.menu_movie, popup.getMenu());

    popup.show();
}

interface MyAdapterListener(){
    void onThumbnailClick();
}

}

关于您的 Activity :

public class MyActivity implements MyAdapterListener(){
...
@override
public void onThumbnailClick(){
  //Do your intent here

  Intent intent = ...

}

}