Android离线文档和示例代码[关闭]

一篇关于Android离线文档和示例代码的文章，以下是文章的分段和标题：

java
public class LoginActivity extends AppCompatActivity {
    private EditText etUsername;
    private EditText etPassword;
    private Button btnLogin;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        etUsername = findViewById(R.id.et_username);
        etPassword = findViewById(R.id.et_password);
        btnLogin = findViewById(R.id.btn_login);
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String username = etUsername.getText().toString();
                String password = etPassword.getText().toString();
                // 在这里添加登录逻辑
            }
        });
    }
}