android中RecyclerView控件实现长按弹出PopupMenu菜单功能

盛年不重来，一日难再晨，及时当勉励，岁月不待人。这篇文章主要讲述android中RecyclerView控件实现长按弹出PopupMenu菜单功能相关的知识，希望能为你提供帮助。
之前写过一篇文章：android中实现简单的聊天功能
现在是在之前功能的基础上，添加一个长按聊天记录，删除对应聊天记录的功能
RecyclerView控件，没有对应的长按事件，我们需要自己手工添加，修改对应的适配器类，注意红色内容为添加内容
ChatAdapter.java：

package com.example.chenrui.app1; import android.support.annotation.NonNull; import android.support.v7.widget.RecyclerView; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.TextView; import com.example.chenrui.common.Chat; import java.util.List; public class ChatAdapter extends RecyclerView.Adapter< ChatAdapter.ViewHolder> {private List< Chat> chatList; public ChatAdapter(List< Chat> chatList) { this.chatList = chatList; }@NonNull @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) { View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.chat_item,viewGroup,false); ViewHolder viewHolder = new ViewHolder(view); return viewHolder; }@Override public void onBindViewHolder(@NonNull final ViewHolder viewHolder, final int i) { Chat chat = chatList.get(i); viewHolder.chatText.setText(chat.getContent()); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(viewHolder.chatText.getLayoutParams()); if(chat.getTargetUser().equals("张三")) { params.gravity = Gravity.LEFT; } else { params.gravity = Gravity.RIGHT; } viewHolder.chatText.setLayoutParams(params); if(onItemClickListener!=null) { viewHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { onItemClickListener.onItemLongClick(viewHolder.itemView,i); return false; } }); } }@Override public int getItemCount() { return chatList.size(); }staticclass ViewHolder extendsRecyclerView.ViewHolder {TextView chatText; public ViewHolder(@NonNull View itemView) { super(itemView); chatText = itemView.findViewById(R.id.chatText); } }private OnItemClickListener onItemClickListener; public interface OnItemClickListener{ void onItemLongClick(View view , int pos); }public void setOnItemClickListener(OnItemClickListener onItemClickListener) { this.onItemClickListener = onItemClickListener; } }

修改对应的类，注意红色内容为添加内容
这里实现了长按聊天内容，弹出一个PopupMenu菜单，PopupMenu菜单的使用参考我的上一篇文章：Android中创建PopupMenu弹出式菜单
菜单有一个删除功能，点击删除功能，删除对应的聊天记录
MainActivity.java

package com.example.chenrui.app1; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.MenuItem; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.PopupMenu; import android.widget.Spinner; import com.example.chenrui.common.Chat; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final RecyclerView chatList = findViewById(R.id.chatList); final List< Chat> chatData = https://www.songbingjia.com/android/new ArrayList< Chat> (); final ChatAdapter chatAdapter = new ChatAdapter(chatData); chatList.setAdapter(chatAdapter); LinearLayoutManager layoutManager = new LinearLayoutManager(this); chatList.setLayoutManager(layoutManager);
chatAdapter.setOnItemClickListener(new ChatAdapter.OnItemClickListener() { @Override public void onItemLongClick(View view, final int pos) { PopupMenu popupMenu = new PopupMenu(MainActivity.this,view); popupMenu.getMenuInflater().inflate(R.menu.menu3,popupMenu.getMenu()); //弹出式菜单的菜单项点击事件 popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {@Override public boolean onMenuItemClick(MenuItem item) { if(item.getItemId()==R.id.delete) { chatData.remove(pos); chatAdapter.notifyItemRemoved(pos); } return false; } }); popupMenu.show(); } }); final Spinner targetUser = findViewById(R.id.targetUser); String[] data = https://www.songbingjia.com/android/{"张三","李四"}; ArrayAdapter< String> adapter = new ArrayAdapter< String> (this,R.layout.support_simple_spinner_dropdown_item,data); targetUser.setAdapter(adapter); final EditText chatContent = findViewById(R.id.chatContent); Button chatSubmit = findViewById(R.id.chatSubmit); chatSubmit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(!chatContent.getText().toString().equals("")) { String user = targetUser.getSelectedItem().toString(); chatData.add(new Chat(user, chatContent.getText().toString())); chatAdapter.notifyItemInserted(chatData.size() - 1); chatList.scrollToPosition(chatData.size() - 1); chatContent.setText(""); } } }); } }

显示效果：