这是我的适配器..

package com.lim.fiture.fiture.adapters;

import android.content.Context;

import android.support.v7.widget.RecyclerView;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.EditText;

import com.lim.fiture.fiture.R;

import com.lim.fiture.fiture.models.Exercise;

import java.util.ArrayList;

public class AdminActivityAdapter extends RecyclerView.Adapter {

Context context;

public ArrayList exercises;

private OnItemClicked onClick;

//make interface like this

public interface OnItemClicked {

void onItemClick(int position);

}

@Override

public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_admin_adapter,parent,false);

AdminActivityAdapter.ViewHolder viewHolder = new AdminActivityAdapter.ViewHolder(view);

return viewHolder;

}

@Override

public void onBindViewHolder(ViewHolder holder, int position) {

holder.exerciseName.setText(exercises.get(position).getExerciseName());

holder.mainMuscleGroup.setText(exercises.get(position).getMainMuscleGroup());

holder.otherMuscleGroup.setText(exercises.get(position).getOtherMuscleGroup());

holder.type.setText(exercises.get(position).getType());

holder.equipment.setText(exercises.get(position).getEquipment());

holder.difficulty.setText(exercises.get(position).getDifficulty());

holder.deleteExercise.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

onClick.onItemClick(position);

}

});

}

@Override

public int getItemCount() {

return exercises.size();

}

public class ViewHolder extends RecyclerView.ViewHolder {

private EditText exerciseName, mainMuscleGroup, otherMuscleGroup, type, equipment, difficulty;

private ImageButton deleteExercise;

public ViewHolder(View itemView) {

super(itemView);

exerciseName = itemView.findViewById(R.id.exerciseName);

mainMuscleGroup = itemView.findViewById(R.id.mainMuscleGroup);

otherMuscleGroup = itemView.findViewById(R.id.otherMuscleGroup);

type = itemView.findViewById(R.id.type);

equipment = itemView.findViewById(R.id.equipment);

difficulty = itemView.findViewById(R.id.difficulty);

deleteExercise = itemView.findViewById(R.id.deleteBtn);

}

}

}

这是我的活动

package com.lim.fiture.fiture.activities;

import android.content.ClipData;

import android.content.Intent;

import android.graphics.Color;

import android.graphics.drawable.ColorDrawable;

import android.os.Bundle;

import android.support.annotation.NonNull;

import android.support.design.widget.FloatingActionButton;

import android.support.design.widget.Snackbar;

import android.support.v7.app.ActionBar;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.support.v7.widget.helper.ItemTouchHelper;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.support.v7.app.AppCompatActivity;

import android.widget.ImageButton;

import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;

import com.google.android.gms.tasks.OnSuccessListener;

import com.google.firebase.auth.AuthResult;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseUser;

import com.google.firebase.database.ChildEventListener;

import com.google.firebase.database.DataSnapshot;

import com.google.firebase.database.DatabaseError;

import com.google.firebase.database.DatabaseReference;

import com.google.firebase.database.FirebaseDatabase;

import com.lim.fiture.fiture.R;

import com.lim.fiture.fiture.adapters.AdminActivityAdapter;

import com.lim.fiture.fiture.adapters.ExercisesAdapter;

import com.lim.fiture.fiture.models.Exercise;

import java.util.ArrayList;

public class AdminActivity extends AppCompatActivity implements AdminActivityAdapter.OnItemClicked {

private RecyclerView exercisesList;

private AdminActivityAdapter adapter;

private RecyclerView.LayoutManager layoutManager;

private FloatingActionButton addExerciseBtn;

private ExercisesAdapter exercisesAdapter;

private ArrayList exercises = new ArrayList<>();

//TODO: instance variables for firebase database

private DatabaseReference exerciseReference;

private static final String TAG = "AdminActivity";

private FirebaseAuth mAuth;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_admin);

mAuth = FirebaseAuth.getInstance();

exerciseReference = FirebaseDatabase.getInstance().getReference("Exercises");

findViews();

loadExercises();

}

@Override

protected void onStart() {

super.onStart();

FirebaseUser user = mAuth.getCurrentUser();

if (user != null) {

// do your stuff

} else {

signInAnonymously();

}

}

private void signInAnonymously() {

mAuth.signInAnonymously().addOnSuccessListener(this, new OnSuccessListener() {

@Override

public void onSuccess(AuthResult authResult) {

// do your stuff

}

})

.addOnFailureListener(this, new OnFailureListener() {

@Override

public void onFailure(@NonNull Exception exception) {

Log.e(TAG, "signInAnonymously:FAILURE", exception);

}

});

}

@Override

public void onClick(View view) {

switch (view.getId()) {

case R.id.addExerciseBtn:

startActivity(new Intent(this, AddExerciseStepOne.class));

break;

}

}

public void findViews() {

addExerciseBtn = findViewById(R.id.addExerciseBtn);

addExerciseBtn.setOnClickListener(this);

exercisesList = findViewById(R.id.exercisesList);

layoutManager = new LinearLayoutManager(this);

exercisesList.setLayoutManager(layoutManager);

ActionBar bar = getSupportActionBar();

bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#2980b9")));

bar.setTitle("Fiture Admin");

}

public void loadExercises() {

exerciseReference.addChildEventListener(new ChildEventListener() {

@Override

public void onChildAdded(DataSnapshot dataSnapshot, String s) {

Exercise exercise = dataSnapshot.getValue(Exercise.class);

Log.d(TAG, exercise.toString());

exercises.add(exercise);

exercisesAdapter = new ExercisesAdapter(AdminActivity.this, exercises);

exercisesList.setAdapter(exercisesAdapter);

}

@Override

public void onChildChanged(DataSnapshot dataSnapshot, String s) {

}

@Override

public void onChildRemoved(DataSnapshot dataSnapshot) {

}

@Override

public void onChildMoved(DataSnapshot dataSnapshot, String s) {

}

@Override

public void onCancelled(DatabaseError databaseError) {

}

});

}

@Override

public void onItemClick(int position) {

}

}

所以我想要做的是当点击删除按钮时它会在回收器视图中删除所选的(包含有关练习的详细信息的cardview)并在firebase中删除它,但我很难在互联网上寻找教程.谁知道怎么做？非常需要你的帮助.谢谢