如何在OnDestroy（Android Firebase）中删除此侦听器？ [英] How do I remove this listener in OnDestroy (Android Firebase)?

问题描述

这是我在OnCreate方法中的ValueEventListener。我想摧毁这是OnDestroy方法，因为它可能导致内存泄漏，我也读过它，这是一个很好的做法。

This is my ValueEventListener in OnCreate method. I want to destroy this is OnDestroy method because it might be causing memory leak and also I've read it that it's a good practice to do so.

mDatabase.child(mPost_key).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            display_author = (String) dataSnapshot.child("author").getValue();
            display_quote = (String) dataSnapshot.child("quote").getValue();
            display_pic_url = (String) dataSnapshot.child("pic_url").getValue();
            categoryData=(String) dataSnapshot.child("catg").getValue();
            display_prof=(String) dataSnapshot.child("prof").getValue();
            copyQuote = (display_quote + " - " +display_author);
            try {
                author.setText(display_author);
                quote.setText(display_quote);
                category.setText(categoryData);
                profession.setText(display_prof);
                Glide.with(SingleExploreQuotes.this).load(display_pic_url).override(192, 192).into(profile_img);

            } catch (Exception e) {
                finish();
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    });

推荐答案

当您注册侦听器时，给听众。将该监听器保留在成员字段中：

When you register the listener, you get back a handle to the listener. Keep that listener in a member field:

private ValueListener mListener;

mListener = mDatabase.child(mPost_key).addValueEventListener(new ValueEventListener() {

然后移除你的 onDestroy（）中的监听器：

And then remove the listener in your onDestroy():

mDatabase.child(mPost_key).removeListener(mListener);

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