package com.example.myapplication; import android.content.ComponentName; import android.content.Intent; import android.os.Bundle; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { Button loginB, newUser; EditText usernameET, passwordET; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); loginB.setOnClickListener(v -> { Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_LONG).show(); Intent intent = new Intent(); ComponentName componentName = new ComponentName(MainActivity.this, InfoActivity.class); intent.setComponent(componentName); startActivity(intent); }); newUser.setOnClickListener(v -> { Intent intent = new Intent(); ComponentName componentName = new ComponentName(MainActivity.this, MainActivity2.class); intent.setComponent(componentName); startActivity(intent); }); } /** * 初始化视图绑定 */ void initView() { loginB = findViewById(R.id.login); usernameET = findViewById(R.id.username); passwordET = findViewById(R.id.password); newUser = findViewById(R.id.newUser); } }