Question

我有这个登录活动，当用户点击登录或注册按钮时，会出现不同的EditTexts。我的问题是如何检查所有EditTexts是否已填写，以便启用continueButton？

（点击登录时，必须填写电子邮件和密码，点击注册时，必须填写电子邮件，密码和用户名）

ACTIVITY_LOGIN.XML

    <?xml version="1.0" encoding="utf-8"?>
<TableLayout 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/tableLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/yellow"
    android:orientation="vertical"
    tools:context=".LoginActivity">

    <TableRow
        android:id="@+id/welcomeTableRow"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="8pt">

        <TextView
            android:id="@+id/welcomeTextView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="@string/welcome_to"
            android:textAlignment="center"
            android:textColor="@color/black"
            android:textSize="18sp"
            android:textStyle="normal|bold" />
    </TableRow>

    <TableRow
        android:id="@+id/logoTableRow"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/welcomeLogoImageView"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:layout_span="2"
            android:contentDescription="@string/todo"
            android:scaleType="fitCenter"
            app:srcCompat="@drawable/logo_medium" />
    </TableRow>

    <TableRow
        android:id="@+id/loginInfoTableRow"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="12pt">

        <TextView
            android:id="@+id/infoEditText"
            android:layout_width="wrap_content"
            android:layout_height="70dp"
            android:padding="6pt"
            android:text="@string/ask_to_register_or_login"
            android:textAlignment="center"
            android:textColor="@android:color/black"
            android:textSize="18sp" />
    </TableRow>

    <TableRow
        android:id="@+id/loginOrRegisterTableRow"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="4pt"
        android:layout_marginEnd="40dp"
        android:layout_marginStart="40dp"
        android:layout_marginTop="12dp">

        <Button
            style="@style/Widget.AppCompat.Button.Borderless"
            android:id="@+id/chooseToLoginButton"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="5dp"
            android:layout_marginStart="10dp"
            android:layout_weight="1"
            android:background="@drawable/login_screen_button_unclicked"
            android:onClick="chosenEvent"
            android:text="@string/login" />

        <Button
            style="@style/Widget.AppCompat.Button.Borderless"
            android:id="@+id/chooseToRegisterButton"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="10dp"
            android:layout_marginStart="5dp"
            android:layout_weight="1"
            android:background="@drawable/login_screen_button_unclicked"
            android:onClick="chosenEvent"
            android:text="@string/register" />
    </TableRow>

    <TableRow
        android:id="@+id/nameTableRow"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginEnd="12dp"
        android:layout_marginStart="12dp"
        android:background="@android:color/white"
        android:padding="4pt"
        android:visibility="visible"
        android:weightSum="1">

        <TextView
            android:id="@+id/nameTextView"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="0.3"
            android:paddingEnd="2pt"
            android:paddingStart="2pt"
            android:text="@string/name"
            android:textAlignment="textEnd"
            android:textColor="@color/black"
            android:textSize="18sp"
            android:textStyle="bold" />

        <EditText
            android:id="@+id/nameEditText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.65"
            android:ems="10"
            android:hint="@string/name"
            android:inputType="textPersonName" />
    </TableRow>

    <TableRow
        android:id="@+id/emailTableRow"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginEnd="12dp"
        android:layout_marginStart="12dp"
        android:background="@android:color/white"
        android:padding="4pt"
        android:visibility="visible"
        android:weightSum="1">


        <TextView
            android:id="@+id/emailTextView"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="0.3"
            android:paddingEnd="2pt"
            android:paddingStart="2pt"
            android:text="@string/email"
            android:textAlignment="textEnd"
            android:textColor="@color/black"
            android:textSize="18sp"
            android:textStyle="bold" />

        <EditText
            android:id="@+id/emailEditText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.65"
            android:ems="10"
            android:hint="@string/email"
            android:inputType="textEmailAddress" />
    </TableRow>

    <TableRow
        android:id="@+id/passwordTableRow"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginEnd="12dp"
        android:layout_marginStart="12dp"
        android:background="@color/white"
        android:padding="4pt"
        android:visibility="visible"
        android:weightSum="1">

        <TextView
            android:id="@+id/passwordTextView"
            android:layout_width="0dp"
            android:layout_height="30dp"
            android:layout_weight="0.3"
            android:paddingEnd="2pt"
            android:paddingStart="2pt"
            android:text="@string/password"
            android:textAlignment="textEnd"
            android:textColor="@color/black"
            android:textSize="18sp"
            android:textStyle="bold" />

        <EditText
            android:id="@+id/passwordEditText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.65"
            android:ems="10"
            android:hint="@string/password"
            android:inputType="textPassword" />
    </TableRow>

    <TableRow
        android:id="@+id/continueButtonTableRow"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginTop="8pt"
        android:visibility="visible">

        <Button
            android:id="@+id/continueButton"
            style="@style/Widget.AppCompat.Button.Borderless"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="80dp"
            android:layout_marginStart="80dp"
            android:background="@drawable/login_screen_button_unclicked"
            android:enabled="false"
            android:text="@string/continue_button"
            android:visibility="visible" />
    </TableRow>

</TableLayout>

登录活动：

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import kotlinx.android.synthetic.main.activity_login.*

LoginActivity:

class LoginActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_login)
    }

    private fun unclickAllChooseButtons() {
        chooseToLoginButton.setBackgroundResource(R.drawable.login_screen_button_unclicked)
        chooseToRegisterButton.setBackgroundResource(R.drawable.login_screen_button_unclicked)
    }

    private fun showEmailRow() {
        emailTableRow.visibility = View.VISIBLE
    }

    private fun showNameRow() {
        nameTableRow.visibility = View.VISIBLE
    }

    private fun showPasswordRow() {
        passwordTableRow.visibility = View.VISIBLE
    }

    private fun hideAllRows() {
        emailTableRow.visibility = View.GONE
        passwordTableRow.visibility = View.GONE
        nameTableRow.visibility = View.GONE
    }

    fun chosenEvent(view: View) {
        when (view.id) {
            R.id.chooseToLoginButton -> {
                unclickAllChooseButtons()
                chooseToLoginButton.setBackgroundResource(R.drawable.login_screen_button_clicked)
                hideAllRows()
                showEmailRow()
                showPasswordRow()
            }
            R.id.chooseToRegisterButton -> {
                unclickAllChooseButtons()
                chooseToRegisterButton.setBackgroundResource(R.drawable.login_screen_button_clicked)
                hideAllRows()
                showNameRow()
                showEmailRow()
                showPasswordRow()
            }
            else -> {
                unclickAllChooseButtons()
            }
        }
    }
}

Answer 1

这很难，因为你需要做的是实时启用按钮。所以你必须听每个EditText，一旦条件符合书面文本，那么你应该把按钮设置为启用。这里还有另一个复杂性：如果用户返回然后尝试删除一些文本，会发生什么。解决这个问题的方法有两种，第一种是保存每个EditText的状态，第二种是验证要发送的数据。

    //You have to set initial state as false representing conditione haven'met
    //Otherwise when you try to get the tag is gonna be null
    boolean initialValidity = false;
    emailEt.setTag(initialValidity);
    passEt.setTag(initialValidity);
    emailEt.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void afterTextChanged(Editable editable) {
        String email = emailEt.getText().toString();
        //You can improve this condition
        if (email.trim().length() > 0 && email.contains("@") && email.contains(".")) {
            emailEt.setTag(true);
            if ((boolean) passEt.getTag()) {
               sendButton.setEnabled(true); 
            }
        } else {
            emailEt.setTag(false);
            sendButton.setEnabled(false);
        }
    }
});
passEt.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void afterTextChanged(Editable editable) {
        String password = passEt.getText().toString();
        //You can improve this condition
        if (!password.contains(" ") && password.length() > 6) {
            passEt.setTag(true);
            if ((boolean) emailEt.getTag()) {
                sendButton.setEnabled(true);
            }
        } else {
            passEt.setTag(false);
            sendButton.setEnabled(false);
        }
    }
});
sendButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        String email = emailEt.getText().toString();
        String password = passEt.getText().toString();
        //TODO add validation to send the data
        //TODO send the data
    }
});

我们在这里做的是听EditText和用户写作时我们检查是否满足条件。 EditText同时检查自己的状况以及其他条件。如果任何Button违反条件中的条款，则此交叉检查允许我们启用或禁用EditText。每个EditText都可以通过检查标签来知道对方是否满足所需条件，该标签是表示是否满足条件的布尔值。我以enabled为例，您可以使用setVisibility()

隐藏

Answer 2

这是您可以获得的所有帮助，因为您没有包含任何代码。另外，我的代码是用Java编写的，你应该明白这个想法。 if(!edittext1.equals("") && !edittext2.equals("")){ // enable button }

Answer 3

您必须使用不同的方法来验证表单是否已满，并完成这些验证：

                public boolean validatePassword(String password){if(!password.equals("")){
                        if(password.length() == 6){ //Valid if the password is of certain sizes

                            this.password = password;
                            return true;
                        }
                        else {
                            Toast.makeText(this, "Length invalid", Toast.LENGTH_SHORT).show();
                            return false;
                        }
                    }
                    else {
                        Toast.makeText(this, "Please enter your password", Toast.LENGTH_SHORT).show();
                        return false;
                    }
                }}

每种表格的方法。

您可以通过以下方式获取表单数据：

String pass = youreditText.getText（）。toString（）;

最后：

                    if(validatePassword(password)){ if(validateOtherForm(text){
                            //What you want to do
                        }}

当用户填写所有EditTexts时显示按钮

3 个答案: