单击操作不在按钮上工作-Java和Android Studio

我觉得自己像个傻瓜，不得不问这个问题，但我正在开发一个需要登录的简单应用程序。如果输入了正确的凭据，它将重定向到设置/首选项活动。如果不是，则显示错误。很简单，对吧？然而，每当我点击按钮时，什么都不会发生

login.java

 import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class login extends AppCompatActivity {
    EditText userName;
    EditText password;
    Boolean verified = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Button loginButton = (Button) findViewById(R.id.loginButton);
        userName = (EditText) findViewById(R.id.userNameField);
        password = (EditText) findViewById(R.id.passwordField);

        loginButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                if ((userName.getText().toString() != "bkAdmin") || (password.getText().toString() != "midAmBK")) {
                    verified = false;
                } else {
                    verified = true;
                }
            }
        });
        SharedPreferences preferences = getSharedPreferences("config.xml", MODE_PRIVATE);
        if (verified) {
            Intent intent = new Intent(this, midamcorp.com.burgerkingapp.preferences.class);
            SharedPreferences.Editor editor = preferences.edit();
            editor.putBoolean("loggedIn", true);
            editor.commit();
            if (preferences.getBoolean("config", false)) {
                editor.putBoolean("config", true);
                editor.commit();
            }
            startActivity(intent);
        } else {
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage("Invalid Username or Password");

            builder.setPositiveButton("Accept", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                            .setAction("Action", null).show();
                }
            });

        }

    }
}

content\u login.xml

   <?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="midamcorp.com.burgerkingapp.login"
    tools:showIn="@layout/activity_login">
<TableLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TableRow android:layout_marginBottom="50dp">
        <TextView
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:minWidth="200dp"
            android:text=" Username:" />
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/userNameField"
        android:minWidth="200dp"
       />

    </TableRow>
    <TableRow android:layout_marginBottom="50dp">
        <TextView
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:minWidth="200dp"
            android:text=" Password:" />
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPassword"

        android:minWidth="200dp"
        android:id="@+id/passwordField"
/>
</TableRow>
<TableRow>
    <Button
        android:id="@+id/loginButton"
        android:text = "Login!" />

</TableRow>
</TableLayout>
</RelativeLayout>

---

我真的非常感谢你的帮助

试试这样的东西。将代码包装在方法中，并在按钮单击事件中调用它

loginButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                if ((userName.getText().toString() != "bkAdmin") || (password.getText().toString() != "midAmBK")) {
                    verified = false;
                } else {
                    verified = true;
                }
                completeRegistration(verified);
            }
        });
}

将其包装在一个方法中

private void completeRegistration(boolean verified){
        if (verified) {
            Intent intent = new Intent(this, midamcorp.com.burgerkingapp.preferences.class);
            SharedPreferences.Editor editor = preferences.edit();
            editor.putBoolean("loggedIn", true);
            editor.commit();
            if (preferences.getBoolean("config", false)) {
                editor.putBoolean("config", true);
                editor.commit();
            }
            startActivity(intent);
        } else {
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage("Invalid Username or Password");

            builder.setPositiveButton("Accept", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                            .setAction("Action", null).show();
                }
            });

        }
}

---

onCreate方法是初始化活动的地方。您的已验证变量将始终为false。按钮单击的回调在onCreate完成后执行。将逻辑移到其他方法或放入按钮回调中。

使用View.OnClickListener而不是button.OnClickListener

您必须编写代码，以便导航到设置屏幕或在

OnClickListener

中显示错误对话框。目前它在它之外。试试这个-

 import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class login extends AppCompatActivity {
    EditText userName;
    EditText password;
    Boolean verified = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Button loginButton = (Button) findViewById(R.id.loginButton);
        userName = (EditText) findViewById(R.id.userNameField);
        password = (EditText) findViewById(R.id.passwordField);
loginButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                if ((userName.getText().toString() != "bkAdmin") || (password.getText().toString() != "midAmBK")) {
                    verified = false;
                } else {
                    verified = true;
                }

 SharedPreferences preferences = getSharedPreferences("config.xml", MODE_PRIVATE);
        if (verified) {
            Intent intent = new Intent(login.this, midamcorp.com.burgerkingapp.preferences.class);
            SharedPreferences.Editor editor = preferences.edit();
            editor.putBoolean("loggedIn", true);
            editor.commit();
            if (preferences.getBoolean("config", false)) {
                editor.putBoolean("config", true);
                editor.commit();
            }
            startActivity(intent);
        } else {
            AlertDialog.Builder builder = new AlertDialog.Builder(login.this);
            builder.setMessage("Invalid Username or Password");

            builder.setPositiveButton("Accept", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                            .setAction("Action", null).show();
                }
            });

        }
            }
        });

---

为什么您没有为按钮指定宽度和高度属性？它是否需要是

findviewbyd（R.id.loginButton）

？非常感谢。似乎许多人提出了类似的解决方案。但是，当我将逻辑放在单击处理程序中时，我遇到了另一个问题-this关键字（用于intent和AlertDialog.Builder不再工作）？我应该用什么来代替？将“this”替换为“login.this”。错误将得到解决。编辑答案。感谢所有的帮助；然而，它仍然不起作用。还有其他想法吗？再次感谢。现在是什么问题？与第一个问题相同，根本没有反应。