检测回车键被按下的最简单的方法是:

mPasswordField.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (event!= null) {   // KeyEvent: If triggered by an enter key, this is the event; otherwise, this is null.
                    signIn(mEmailField.getText().toString(), mPasswordField.getText().toString());
                    return true;
                } else {
                    return false;
                }
            }
        });

     password.setOnEditorActionListener(new TextView.OnEditorActionListener() {
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            if(event != null && event.getKeyCode() == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.toggleSoftInput(InputMethodManager.SHOW_IMPLICIT, 0);
                submit.performClick();
                return true;
            }
            return false;
        }
    });

对我来说很好 另外隐藏键盘

我使用Kotlin创建了一个函数，它可以处理EditText的所有“完成”动作，包括键盘，并且可以修改它，也可以处理其他按键:

private val DEFAULT_ACTIONS_TO_HANDLE_AS_DONE_FOR_EDIT_TEXT = arrayListOf(EditorInfo.IME_ACTION_SEND, EditorInfo.IME_ACTION_GO, EditorInfo.IME_ACTION_SEARCH, EditorInfo.IME_ACTION_DONE)
private val DEFAULT_KEYS_TO_HANDLE_AS_DONE_FOR_EDIT_TEXT = arrayListOf(KeyEvent.KEYCODE_ENTER, KeyEvent.KEYCODE_NUMPAD_ENTER)

fun EditText.setOnDoneListener(function: () -> Unit, onKeyListener: OnKeyListener? = null, onEditorActionListener: TextView.OnEditorActionListener? = null,
                               actionsToHandle: Collection<Int> = DEFAULT_ACTIONS_TO_HANDLE_AS_DONE_FOR_EDIT_TEXT,
                               keysToHandle: Collection<Int> = DEFAULT_KEYS_TO_HANDLE_AS_DONE_FOR_EDIT_TEXT) {
    setOnEditorActionListener { v, actionId, event ->
        if (onEditorActionListener?.onEditorAction(v, actionId, event) == true)
            return@setOnEditorActionListener true
        if (actionsToHandle.contains(actionId)) {
            function.invoke()
            return@setOnEditorActionListener true
        }
        return@setOnEditorActionListener false
    }
    setOnKeyListener { v, keyCode, event ->
        if (onKeyListener?.onKey(v, keyCode, event) == true)
            return@setOnKeyListener true
        if (event.action == KeyEvent.ACTION_DOWN && keysToHandle.contains(keyCode)) {
            function.invoke()
            return@setOnKeyListener true
        }
        return@setOnKeyListener false
    }
}

那么，示例用法:

        editText.setOnDoneListener({
            //do something
        })

至于改变标签，我认为这取决于键盘应用，它通常只在横屏上改变，就像这里写的那样。总之，这个的用法示例:

        editText.imeOptions = EditorInfo.IME_ACTION_DONE
        editText.setImeActionLabel("ASD", editText.imeOptions)

或者，如果你想用XML:

    <EditText
        android:id="@+id/editText" android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:imeActionLabel="ZZZ" android:imeOptions="actionDone" />

结果(横屏显示):

final EditText edittext = (EditText) findViewById(R.id.edittext);
edittext.setOnKeyListener(new OnKeyListener() {
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        // If the event is a key-down event on the "enter" button
        if ((event.getAction() == KeyEvent.ACTION_DOWN) &&
            (keyCode == KeyEvent.KEYCODE_ENTER)) {
          // Perform action on key press
          Toast.makeText(HelloFormStuff.this, edittext.getText(), Toast.LENGTH_SHORT).show();
          return true;
        }
        return false;
    }
});

本页详细描述了如何做到这一点。

https://developer.android.com/training/keyboard-input/style.html

设置android:imeOptions，然后检查onEditorAction中的actionId。因此，如果你设置imeOptions为“actionDone”，那么你会检查“actionId == EditorInfo”。onEditorAction中的IME_ACTION_DONE `。另外，确保设置android:inputType。

如果使用材质设计，将代码放在TextInputEditText中。

下面是上面链接的例子中的EditText:

<EditText
    android:id="@+id/search"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/search_hint"
    android:inputType="text"
    android:imeOptions="actionSend" />

您还可以使用setImeOptions(int)函数以编程方式设置此选项。下面是上面链接的例子中的OnEditorActionListener:

EditText editText = (EditText) findViewById(R.id.search);
editText.setOnEditorActionListener(new OnEditorActionListener() {
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        boolean handled = false;
        if (actionId == EditorInfo.IME_ACTION_SEND) {
            sendMessage();
            handled = true;
        }
        return handled;
    }
});

我想知道是否有办法 处理用户按Enter键时 输入EditText之类的 onSubmit HTML事件。

是的。

也在想有没有办法 操作虚拟键盘 就像“完成”按钮一样 标记其他东西(例如 “Go”)并执行某个动作 当点击(再次，像onSubmit)。

也没错。

你会想看看android:imeActionId和android:imeOptions属性，加上setOnEditorActionListener()方法，所有的TextView。

要将“Done”按钮的文本更改为自定义字符串，请使用:

mEditText.setImeActionLabel("Custom text", KeyEvent.KEYCODE_ENTER);