Question

单击Edittext后，我需要显示错误标签。例如，在活动开始时，不应显示错误标签。当然，聚焦的edittext是edtFirstName，如果我单击edtLastName并将edtFirstName留空，它应该显示错误消息。与edtLastName相同。我的问题是在最开始，edtLastName的错误标签已经显示其错误标签“不能为空”。它甚至在活动开始时调用onFocusChange，因为焦点位于edtFirstname。我该怎么办呢？我想做Android上的谷歌添加帐户。

       public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        view = inflater.inflate(R.layout.content_signup, container, false);

        edtFirstName = (EditText) view.findViewById(R.id.edtFirstName);
        edtLastName = (EditText) view.findViewById(R.id.edtLastName);

        tilFName = (TextInputLayout) view.findViewById(R.id.tilFName);
        tilLName = (TextInputLayout) view.findViewById(R.id.tilLName);

        edtFirstName.setOnFocusChangeListener(this);
        edtLastName.setOnFocusChangeListener(this);

然后

 @Override
    public void onFocusChange(View v, boolean hasFocus) {

        boolean flag = false;

        // First Name
        if (!edtFirstName.hasFocus())
        {
            if (edtFirstName.getText().toString().isEmpty())
            {
                tilFName.setError("Must not be empty.");
            }
            else
            {
                tilFName.setError(null);
            }

        }

        if (!edtLastName.hasFocus()) // this is triggered at the start of the activity. 
        {

            if (edtLastName.getText().toString().isEmpty())
            {
                tilLName.setError("Must not be empty.");
            }
            else
            {
                tilLName.setError(null);
            }

        }

是否有合适的LostFocus代码？

EDIT :: This is what happening after starting the app. I'm not tapping anything. The code already called onFocusChange at the startup

Answer 1

将其添加到Activity的父XML布局容器中：

android:focusable="true"
android:focusableInTouchMode="true"

即如果您使用的是RelativeLayout：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
android:focusableInTouchMode="true"
tools:context="com.example.activities.SampleActivity">

Answer 2

试试这个

{{1}}

Answer 3

经过数小时的尝试后，我能够解决自己的问题

 edtFirstName.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
           edtFirstName.setOnFocusChangeListener(new View.OnFocusChangeListener() {
               @Override
               public void onFocusChange(View v, boolean hasFocus) {

                   if (!edtFirstName.hasFocus()) {
                       if (edtFirstName.getText().toString().isEmpty()) {
                           tilFName.setError("Must not be empty.");
                       } else {
                           tilFName.setError(null);
                       }
                   }

               }
           });

            return false;
        }
    });

    edtLastName.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            edtLastName.setOnFocusChangeListener(new View.OnFocusChangeListener() {
                @Override
                public void onFocusChange(View v, boolean hasFocus) {

                    if(!edtLastName.hasFocus()) {
                        if (edtLastName.getText().toString().isEmpty()) {
                            tilLName.setError("Must not be empty.");
                        } else {
                            tilLName.setError(null);
                        }
                    }
                }
            });

            return false;
        }
    });

也许我必须缩短代码，因为我还有其他的edittexts在等待。大声笑。感谢你的帮助！

！在关注Edittext（Android）之后触发hasFocus

3 个答案: