本文介绍了如何从RecyclerView删除或删除CardView?Android Studio的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在我的RecyclerView上是CardView,其中包含有关特定练习的详细信息,在我的CardView上,旁边有一个ImageDeleteBtn.如何从RecyclerView和Firebase上删除CardView?
On my RecyclerView are CardViews containing details about a certain exercise and on my CardView, there is an ImageDeleteBtn beside it. How do I delete the CardView from the RecyclerView and on Firebase?
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 android.widget.ImageButton;
import com.lim.fiture.fiture.R;
import com.lim.fiture.fiture.models.Exercise;
import java.util.ArrayList;
public class AdminActivityAdapter extends RecyclerView.Adapter <AdminActivityAdapter.ViewHolder>{
Context context;
public ArrayList <Exercise> 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 View.OnClickListener, AdminActivityAdapter.OnItemClicked {
private RecyclerView exercisesList;
private AdminActivityAdapter adapter;
private RecyclerView.LayoutManager layoutManager;
private FloatingActionButton addExerciseBtn;
private ExercisesAdapter exercisesAdapter;
private ArrayList<Exercise> 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<AuthResult>() {
@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) {
}
}
有人知道该怎么做吗?对我来说将是非常巨大的帮助.谢谢你!
Anyone knows how to this? It'll be a very huge help for me. Thanks ahead!
推荐答案
解决方案:
在您的 onBindView(..)
里面这样写:
holder.deleteExercise.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
exercises.remove(holder.getAdapterPosition());
notifyItemRemoved(holder.getAdapterPosition());
notifyItemRangeChanged(holder.getAdapterPosition(), exercises.size());
}
});
希望有帮助.
这篇关于如何从RecyclerView删除或删除CardView?Android Studio的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!