Android studio登录界面代码
时间: 2023-09-24 22:11:04 浏览: 43
以下是一个简单的 Android Studio 登录界面的代码示例:
布局文件 login_activity.xml:
```
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/usernameEditText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="Username"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintHorizontal_bias="0.5"
android:layout_marginTop="32dp"/>
<EditText
android:id="@+id/passwordEditText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="Password"
android:inputType="textPassword"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/usernameEditText"
app:layout_constraintHorizontal_bias="0.5"
android:layout_marginTop="16dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Login"
android:id="@+id/loginButton"
app:layout_constraintTop_toBottomOf="@id/passwordEditText"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
android:layout_marginTop="32dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>
```
Java 代码 Login.java:
```
public class Login extends AppCompatActivity {
private EditText usernameEditText;
private EditText passwordEditText;
private Button loginButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_activity);
usernameEditText = findViewById(R.id.usernameEditText);
passwordEditText = findViewById(R.id.passwordEditText);
loginButton = findViewById(R.id.loginButton);
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String username = usernameEditText.getText().toString();
String password = passwordEditText.getText().toString();
if (username.equals("admin") && password.equals("password")) {
// 登录成功,启动新的 Activity
Intent intent = new Intent(Login.this, MainActivity.class);
startActivity(intent);
} else {
// 显示错误消息
Toast.makeText(Login.this, "Invalid username or password", Toast.LENGTH_SHORT).show();
}
}
});
}
}
```
这个示例使用了 ConstraintLayout 布局和 EditText、Button 组件,当用户点击登录按钮时,它会验证用户名和密码的有效性并根据结果启动一个新的 Activity 或显示一个错误消息。