RxAndroid `Observable...subscribe` 在 Android Studio 中突出显示 [英] RxAndroid `Observable...subscribe` highlighted in Android Studio

问题描述

我正在使用 RxAndroid 将一个字符串从后台线程编组到主线程中，并在该主线程上对该字符串执行一些操作:

I'm using RxAndroid to marshal a string from a background thread into the main thread, and do something with that string on that main thread:

String stringFromDatabase = readFromDatabase();

Observable.just(stringFromDatabase)
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(new Consumer<String>() {
        @Override
        public void accept(String string) throws Exception {
            webViewFragment.onInjectMessage(string, null);
        }
    });

Android Studio 以黄色突出显示整个 Observable.just... 命令链，告诉我订阅的结果未使用"，当我悬停时就可以了.

Android Studio is highlighting the entire Observable.just... command chain in yellow, telling me that "The result of subscribe is not used", when I hover on it.

如果我将 .dispose() 添加到链的末尾，突出显示消失，但 webViewFragment.onInjectMessage(string, null); 代码不再执行.

If I add .dispose() to the end of the chain, the highlighting disappears, but the webViewFragment.onInjectMessage(string, null); code is no longer executed.

我注意到我可以通过向整个方法添加 @SuppressLint("CheckResult") 注释来删除突出显示.

I noticed that I can remove the highlighting by adding a @SuppressLint("CheckResult") annotation to the entire method.

这是一个可以安全忽略的警告，还是我在这里造成了某种内存泄漏或其他问题?这是一种不好的做法吗?

Is this something like a warning which can be safely ignored, or am I creating some kind of a memory leak or other problem here? Is this a bad practice?

推荐答案

你必须处理它以避免内存泄漏.尝试在 onDestroy

You have to dispose it to avoid memory leak. Try to dispose inside onDestroy

Disposable disposable;

String stringFromDatabase = readFromDatabase();
disposable = Observable.just(stringFromDatabase)
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new Consumer<String>() {
            @Override
            public void accept(String string) {
                webViewFragment.onInjectMessage(string, null);
            }
        });

@Override
protected void onDestroy() {
    super.onDestroy();

    disposable.dispose();
}

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