Android implements clicking the button to switch pages

1. Implemented functions

Click the page button to switch to the next page.

Two, the main code

1) The first page

We need to implement clicking the login button to switch pages

A Button is set in the layout, and only part of the code of the button is displayed

<!-- 登录按钮行  -->
<Button
    android:id="@+id/loginBtn"
    android:layout_width="220dp"
    android:layout_height="60dp"
    android:layout_marginTop="16dp"
    android:background="@drawable/shape"
    android:text="登录"
    android:textColor="#ffffff"
    android:textSize="16sp"
    >

 Login page LoginActivity code,

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

    Button button;
    button = findViewById(R.id.loginBtn);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // 显示跳转
                //第二个页面MainActivity
            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
            startActivity(intent);
            }
    });

}

3. Startup page

The startup page should be set as the first page, in AndroidMainfest.xml

<activity
    android:name=".LoginActivity"
    android:exported="true" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>

    <meta-data
        android:name="android.app.lib_name"
        android:value="" />
</activity>