Question

我试图在EditText上添加一些TextWatchers，但我应该在需要时删除它们。

...

@BindView(R.id.widget_search_edittext)
MaterialEditText mEditText;

private List<TextWatcher> textWatcherList;

...

public void addTextChangedListener(TextWatcher watcher) {
    textWatcherList.add(watcher);
    mEditText.addTextChangedListener(watcher);
}

public void removeAllTextChangedListeners() {
    for (TextWatcher watcher : textWatcherList) {
        mEditText.removeTextChangedListener(watcher);
    }
    textWatcherList.clear();
}

但是没有任何意义吗？

Answer 1

确保在扩展的TextWather类中覆盖equals()。因为存储在arrayList abd中的观察者通过调用依赖于equals函数的arraylist.indexOf(watcher)来移除。

public void addTextChangedListener(TextWatcher watcher) {
    if (mListeners == null) {
        mListeners = new ArrayList<TextWatcher>();
    }
    mListeners.add(watcher);
}
/**
 * Removes the specified TextWatcher from the list of those whose
 * methods are called
 * whenever this TextView's text changes.
 */
public void removeTextChangedListener(TextWatcher watcher) {
    if (mListeners != null) {
        int i = mListeners.indexOf(watcher);
        if (i >= 0) {
            mListeners.remove(i);
        }
    }
}

了解textView如何在内部删除Watcher

从EditText中删除所有TextWatchers

1 个答案: