在Chat App中如何使用Firebase实施键入指示器 [英] In Chat App How to implement Typing indicator using Firebase

问题描述

在聊天应用程序中，如何使用Firebase实施键入指示，以指示某人正在键入内容，就像Android Studio中的whats-app或Messenger一样

In chat App how to implement Typing indicator that someone is Typing just like whats-app or Messenger in Android Studio using Firebase

推荐答案

要实现此目的，您需要在Firebase数据库中添加一个名为typing且默认值为false的新字段.然后在EditText上使用addTextChangedListener()方法实际查看有人键入消息的时间.当有人键入内容时，会触发onTextChanged()方法.现在，将typing的值从false更改为true.之后，addValueEventListener查看何时更改值.如果该值为true，则在您的聊天室中显示该消息.因此，我建议您使用以下代码:

To achieve this, you need add a new field in your Firebase database named: typing with the default value of false. Then use addTextChangedListener() method on your EditText to actually see when someone types a message. When someone types something, onTextChanged() method is triggered. Now change the value of typing from false to true. After this, addValueEventListener to see when the value is changed. If the value is true, then display that message in your chat room. So, i suggest you using the following code:

yourEditText.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        if (!TextUtils.isEmpty(s)) {
            //Set the value of typing field to true.
        } else {
            // Set to false
        }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

    @Override
    public void afterTextChanged(Editable s) {}
});

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