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我创建了一个 onClick 调用 registerUser 方法的注册按钮。我检查了我的 xml 文件中的 tool.context ，但没有问题。我的代码确实注册了，但它在 xml 文件中给出了警告。这是我第一次在 android 中编码，所以我担心它以后可能会破坏某些东西。XML 文件：

<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SignUpActivity">
 <Button
    android:id="@+id/signUpBtn"
    android:onClick="registerUser"
    android:layout_width="246dp"
    android:layout_height="68dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginBottom="8dp"
    android:text="Register"
    android:textSize="24sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/passwordField1" />

Java 文件：

public class SignUpActivity extends AppCompatActivity{ // implements View.OnClickListener{
private EditText emailField;
private EditText passwordField;
private EditText passwordField1;
private Button signUpBtn;
private FirebaseAuth mAuth;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sign_up);

    emailField = (EditText) findViewById(R.id.emailField);
    passwordField = (EditText) findViewById(R.id.passwordField);
    passwordField1 = (EditText) findViewById(R.id.passwordField1);
    signUpBtn = (Button) findViewById(R.id.signUpBtn);
    mAuth = FirebaseAuth.getInstance();

    signUpBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            registerUser();

        }
    });




}
public void registerUser(){
    String email = emailField.getText().toString().trim();
    String password = passwordField.getText().toString().trim();
    String password1 = passwordField1.getText().toString().trim();

    if (email.isEmpty()){
        emailField.setError("Email is Required");
        emailField.requestFocus();
        return;
    }

    if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()){
        emailField.setError("Email needs to be valid");
        emailField.requestFocus();
        return;
    }
    if (password.isEmpty()){
        passwordField.setError("Password is Required");
        passwordField.requestFocus();
        return;
    }

    if (password.length() < 6){
        passwordField.setError("Password needs to have at least 6 characters");
        passwordField.requestFocus();
        return;
    }

    if (!password1.equals(password)){
        passwordField1.setError("Passwords must match");
        passwordField1.requestFocus();
        return;
    }

    mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task)
        {
            if (!task.isSuccessful())
            {
                try
                {
                    throw task.getException();
                }
                catch (FirebaseAuthUserCollisionException existEmail)
                {
                    emailField.setError("Email is already used.");
                    emailField.requestFocus();
                }
                catch (Exception e)
                {
                    emailField.setError(e.getMessage());
                    emailField.requestFocus();
                }

            }
            else
                Toast.makeText(getApplicationContext(), "You are Registered!", Toast.LENGTH_SHORT).show();
        }
    });

}

}

4

1 回答 1

2

您的registerUser方法应具有以下内容：

  • 公开
  • 返回无效
  • 定义一个视图作为它的唯一参数（这将是被点击的视图）

所以正确的定义是：

public void registerUser(View view) {
    //do something
}

编辑：

不要同时使用两种方式添加点击监听，如果使用 XML 方式，则应定义如下方法：

public void registerUser(View view) {
        //do something
}

并删除以下行：

signUpBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            registerUser();
        }
 });

如果您使用 java 代码添加点击侦听器，您应该删除：

android:onClick="registerUser"
于 2018-12-01T22:48:48.393 回答