Java 与安卓系统中使用Firebase的Likes计数器混淆

我是一名初学者，正在从事一个android项目，用户喜欢管理员为他们发布的帖子。当用户单击like按钮时，like将更新为firebase。问题是，即使用户喜欢或不喜欢该帖子，喜欢的数量也在增加。请调查一下

注意：

Log.d(TAG, "Liked onDataChange: "+isLiked);

        @Override
        public void onLike(View v, int position) {

            UploadImage selectedItem = mUploads.get(position);
            String selectedKey = selectedItem.getKey();
            final ShineButton shineButton = new ShineButton(Objects.requireNonNull(getActivity()));
            shineButton.setBtnFillColor(RED);
            shineButton.setShapeResource(R.raw.heart);
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100,100);
            shineButton.setLayoutParams(layoutParams);



            final DatabaseReference likesRef = FirebaseDatabase.getInstance().getReference().child("ImageUploads").child(selectedKey).child("likes");
            likesRef.addListenerForSingleValueEvent(new ValueEventListener(){
                @Override
                public void onDataChange(@NotNull DataSnapshot dataSnapshot) {
                    long numLikes = 0;
                    if(dataSnapshot.exists()){
                        numLikes = dataSnapshot.getValue(Long.class);
                    }
                    boolean isLiked = shineButton.isSelected();

                    Log.d(TAG, "Liked onDataChange: "+isLiked);
                    if(isLiked){
                        //If already liked then user wants to unlike the post

                        likesRef.setValue(numLikes-1);

                    }else {
                        //If not liked already then user wants to like the post
                        likesRef.setValue(numLikes+1);
                        shineButton.setEnabled(false);
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

            ShineButton like  =  layout.findViewById(R.id.like_feed);
            System.out.println(RED);
            like.setBackground(getResources().getDrawable(R.drawable.like_feed_bg));

        }

            public void onLike(View v, int position) {

            UploadImage selectedItem = mUploads.get(position);
            String selectedKey = selectedItem.getKey();
            final ShineButton shineButton = new ShineButton(Objects.requireNonNull(getActivity()));
            shineButton.setBtnFillColor(RED);
            shineButton.setShapeResource(R.raw.heart);
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100,100);
            shineButton.setLayoutParams(layoutParams);

            final DatabaseReference likesRef = FirebaseDatabase.getInstance().getReference().child("ImageUploads").child(selectedKey).child("likes");
            likesRef.addListenerForSingleValueEvent(new ValueEventListener(){
                @Override
                public void onDataChange(@NotNull final DataSnapshot dataSnapshot) {
                    long numLikes = 0;

                    if(dataSnapshot.exists()){
                        numLikes = dataSnapshot.getValue(Long.class);
                    }

                    final long finalNumLikes = numLikes;

                    shineButton.setOnCheckStateChangeListener(new ShineButton.OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(View view, boolean checked) {


                            if (checked){
                                likesRef.setValue(finalNumLikes-1);
                            }
                            else{
                                likesRef.setValue(finalNumLikes+1);
                            }
                        }
                    });

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

            ShineButton like  =  layout.findViewById(R.id.like_feed);
            System.out.println(RED);
            like.setBackground(getResources().getDrawable(R.drawable.like_feed_bg));

        }

无论我们喜欢还是不喜欢shinebutton，返回false。Shinebutton是一个图书馆

链接到其GitHub：

onLike方法：

Log.d(TAG, "Liked onDataChange: "+isLiked);

        @Override
        public void onLike(View v, int position) {

            UploadImage selectedItem = mUploads.get(position);
            String selectedKey = selectedItem.getKey();
            final ShineButton shineButton = new ShineButton(Objects.requireNonNull(getActivity()));
            shineButton.setBtnFillColor(RED);
            shineButton.setShapeResource(R.raw.heart);
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100,100);
            shineButton.setLayoutParams(layoutParams);



            final DatabaseReference likesRef = FirebaseDatabase.getInstance().getReference().child("ImageUploads").child(selectedKey).child("likes");
            likesRef.addListenerForSingleValueEvent(new ValueEventListener(){
                @Override
                public void onDataChange(@NotNull DataSnapshot dataSnapshot) {
                    long numLikes = 0;
                    if(dataSnapshot.exists()){
                        numLikes = dataSnapshot.getValue(Long.class);
                    }
                    boolean isLiked = shineButton.isSelected();

                    Log.d(TAG, "Liked onDataChange: "+isLiked);
                    if(isLiked){
                        //If already liked then user wants to unlike the post

                        likesRef.setValue(numLikes-1);

                    }else {
                        //If not liked already then user wants to like the post
                        likesRef.setValue(numLikes+1);
                        shineButton.setEnabled(false);
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

            ShineButton like  =  layout.findViewById(R.id.like_feed);
            System.out.println(RED);
            like.setBackground(getResources().getDrawable(R.drawable.like_feed_bg));

        }

            public void onLike(View v, int position) {

            UploadImage selectedItem = mUploads.get(position);
            String selectedKey = selectedItem.getKey();
            final ShineButton shineButton = new ShineButton(Objects.requireNonNull(getActivity()));
            shineButton.setBtnFillColor(RED);
            shineButton.setShapeResource(R.raw.heart);
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100,100);
            shineButton.setLayoutParams(layoutParams);

            final DatabaseReference likesRef = FirebaseDatabase.getInstance().getReference().child("ImageUploads").child(selectedKey).child("likes");
            likesRef.addListenerForSingleValueEvent(new ValueEventListener(){
                @Override
                public void onDataChange(@NotNull final DataSnapshot dataSnapshot) {
                    long numLikes = 0;

                    if(dataSnapshot.exists()){
                        numLikes = dataSnapshot.getValue(Long.class);
                    }

                    final long finalNumLikes = numLikes;

                    shineButton.setOnCheckStateChangeListener(new ShineButton.OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(View view, boolean checked) {


                            if (checked){
                                likesRef.setValue(finalNumLikes-1);
                            }
                            else{
                                likesRef.setValue(finalNumLikes+1);
                            }
                        }
                    });

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

            ShineButton like  =  layout.findViewById(R.id.like_feed);
            System.out.println(RED);
            like.setBackground(getResources().getDrawable(R.drawable.like_feed_bg));

        }

修改代码后：现在，不管我们喜欢还是不喜欢，计数都不会增加或减少

Onlike方法：

Log.d(TAG, "Liked onDataChange: "+isLiked);

        @Override
        public void onLike(View v, int position) {

            UploadImage selectedItem = mUploads.get(position);
            String selectedKey = selectedItem.getKey();
            final ShineButton shineButton = new ShineButton(Objects.requireNonNull(getActivity()));
            shineButton.setBtnFillColor(RED);
            shineButton.setShapeResource(R.raw.heart);
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100,100);
            shineButton.setLayoutParams(layoutParams);



            final DatabaseReference likesRef = FirebaseDatabase.getInstance().getReference().child("ImageUploads").child(selectedKey).child("likes");
            likesRef.addListenerForSingleValueEvent(new ValueEventListener(){
                @Override
                public void onDataChange(@NotNull DataSnapshot dataSnapshot) {
                    long numLikes = 0;
                    if(dataSnapshot.exists()){
                        numLikes = dataSnapshot.getValue(Long.class);
                    }
                    boolean isLiked = shineButton.isSelected();

                    Log.d(TAG, "Liked onDataChange: "+isLiked);
                    if(isLiked){
                        //If already liked then user wants to unlike the post

                        likesRef.setValue(numLikes-1);

                    }else {
                        //If not liked already then user wants to like the post
                        likesRef.setValue(numLikes+1);
                        shineButton.setEnabled(false);
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

            ShineButton like  =  layout.findViewById(R.id.like_feed);
            System.out.println(RED);
            like.setBackground(getResources().getDrawable(R.drawable.like_feed_bg));

        }

            public void onLike(View v, int position) {

            UploadImage selectedItem = mUploads.get(position);
            String selectedKey = selectedItem.getKey();
            final ShineButton shineButton = new ShineButton(Objects.requireNonNull(getActivity()));
            shineButton.setBtnFillColor(RED);
            shineButton.setShapeResource(R.raw.heart);
            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100,100);
            shineButton.setLayoutParams(layoutParams);

            final DatabaseReference likesRef = FirebaseDatabase.getInstance().getReference().child("ImageUploads").child(selectedKey).child("likes");
            likesRef.addListenerForSingleValueEvent(new ValueEventListener(){
                @Override
                public void onDataChange(@NotNull final DataSnapshot dataSnapshot) {
                    long numLikes = 0;

                    if(dataSnapshot.exists()){
                        numLikes = dataSnapshot.getValue(Long.class);
                    }

                    final long finalNumLikes = numLikes;

                    shineButton.setOnCheckStateChangeListener(new ShineButton.OnCheckedChangeListener() {

                        @Override
                        public void onCheckedChanged(View view, boolean checked) {


                            if (checked){
                                likesRef.setValue(finalNumLikes-1);
                            }
                            else{
                                likesRef.setValue(finalNumLikes+1);
                            }
                        }
                    });

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

            ShineButton like  =  layout.findViewById(R.id.like_feed);
            System.out.println(RED);
            like.setBackground(getResources().getDrawable(R.drawable.like_feed_bg));

        }

---

问题是您没有检查正在按下的按钮的状态。您可以通过执行以下操作来实现这一点：

替换：

if（islike）{
//如果已经喜欢了，那么用户希望不喜欢帖子
likesRef.setValue（numLikes-1）；}
否则{
//如果不喜欢已经然后用户想要喜欢的职位
likesRef.setValue（numLikes+1）；
shineButton.setEnabled（假）；
}

为此：

shineButton.setOnCheckStateChangeListener（新的shineButton.OnCheckedChangeListener（）{
@凌驾
已更改公共void（视图，布尔值已选中）{
如果（选中）{
likesRef.setValue（numLikes+1）；
}否则{
likesRef.setValue（numLikes-1）；
}
} 
});

---

当您关闭应用程序时，您还必须保留botton的引用。您可以使用

SharedReferences

来完成此操作，请帮助我。Does

Log.d（标记“Liked onDataChange:”+isLiked）喜欢时返回false？是。。当我们不喜欢它时，它返回false。如果它返回false，那么您将继续添加新的like。如果（！isLiked）

与布尔isLiked=shinebutton.isSelected（）不同或相似，请尝试将其更改为

；返回值总是false。怎么办？答案很好，但问题是变量numLikes是在innerclass中访问的。所以我向全球宣布。现在即使我们喜欢或不喜欢这个数字也不是changing@UdayKiran只需制造核弹就行了，最终它就成了定局。然后它也不是增加或减少@HB@UdayKiran你说你让它全球化了，请编辑你的问题并展示它现在是怎样的。我让它全球化了，并尝试了。。它不起作用。然后我做了最后的决定。。它不起作用。我将编辑并发布问题@血红蛋白