在Aadroid studio用相对布局做注册页面,注册页面有用户名、密码和男女按钮，当用户名或密码为空时，不能跳转，用Toast提示不能为空,当点击注册时,在另一个页面显示所注册的信息,给出相关文件代码。

1. 在res/layout文件夹下创建register_layout.xml文件，使用相对布局实现注册页面：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/username_et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入用户名"
        android:textColorHint="#999"
        android:layout_marginTop="40dp"
        android:padding="10dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"/>

    <EditText
        android:id="@+id/password_et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入密码"
        android:textColorHint="#999"
        android:layout_below="@id/username_et"
        android:padding="10dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"/>

    <TextView
        android:id="@+id/gender_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="性别："
        android:textColor="#000"
        android:layout_below="@id/password_et"
        android:padding="10dp"
        android:layout_marginLeft="20dp"/>

    <RadioGroup
        android:id="@+id/gender_rg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_toRightOf="@id/gender_tv"
        android:layout_alignBaseline="@id/gender_tv"
        android:layout_marginLeft="10dp">

        <RadioButton
            android:id="@+id/male_rb"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="男"
            android:checked="true"/>

        <RadioButton
            android:id="@+id/female_rb"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女"/>

    </RadioGroup>

    <Button
        android:id="@+id/register_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="注册"
        android:textColor="#fff"
        android:background="#1E90FF"
        android:layout_below="@id/gender_tv"
        android:layout_margin="20dp"/>

</RelativeLayout>

2. 在res/layout文件夹下创建register_info_layout.xml文件，用于显示注册信息：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/username_tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#000"/>

    <TextView
        android:id="@+id/password_tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#000"
        android:layout_marginTop="10dp"/>

    <TextView
        android:id="@+id/gender_info_tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#000"
        android:layout_marginTop="10dp"/>

</LinearLayout>

3. 在MainActivity.java中实现注册页面逻辑：

public class MainActivity extends AppCompatActivity {

    private EditText mUsernameEt;
    private EditText mPasswordEt;
    private RadioGroup mGenderRg;

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

        mUsernameEt = findViewById(R.id.username_et);
        mPasswordEt = findViewById(R.id.password_et);
        mGenderRg = findViewById(R.id.gender_rg);

        Button registerBtn = findViewById(R.id.register_btn);
        registerBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String username = mUsernameEt.getText().toString();
                String password = mPasswordEt.getText().toString();
                int genderId = mGenderRg.getCheckedRadioButtonId();

                if (TextUtils.isEmpty(username)) {
                    Toast.makeText(MainActivity.this, "用户名不能为空", Toast.LENGTH_SHORT).show();
                    return;
                }

                if (TextUtils.isEmpty(password)) {
                    Toast.makeText(MainActivity.this, "密码不能为空", Toast.LENGTH_SHORT).show();
                    return;
                }

                Intent intent = new Intent(MainActivity.this, RegisterInfoActivity.class);
                intent.putExtra("username", username);
                intent.putExtra("password", password);
                if (genderId == R.id.male_rb) {
                    intent.putExtra("gender", "男");
                } else {
                    intent.putExtra("gender", "女");
                }
                startActivity(intent);
            }
        });
    }
}

4. 在RegisterInfoActivity.java中显示注册信息：

public class RegisterInfoActivity extends AppCompatActivity {

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

        TextView usernameTv = findViewById(R.id.username_tv);
        TextView passwordTv = findViewById(R.id.password_tv);
        TextView genderTv = findViewById(R.id.gender_info_tv);

        Intent intent = getIntent();
        String username = intent.getStringExtra("username");
        String password = intent.getStringExtra("password");
        String gender = intent.getStringExtra("gender");

        usernameTv.setText("用户名：" + username);
        passwordTv.setText("密码：" + password);
        genderTv.setText("性别：" + gender);
    }
}