RadioButton rbOne, rbTwo, rbThree, rbFour;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    rbOne = findViewById(R.id.rbOne);
    rbTwo = findViewById(R.id.rbTwo);
    rbThree = findViewById(R.id.rbThree);
    rbFour = findViewById(R.id.rbFour);
    rbOne.setOnClickListener(this);
    rbTwo.setOnClickListener(this);
    rbThree.setOnClickListener(this);
    rbFour.setOnClickListener(this);
}
@Override
public void onClick(View view) {
    if (view == rbOne) {
        isChecked(1);
        Toast.makeText(getApplicationContext(), rbOne.getText().toString(), Toast.LENGTH_SHORT).show();
    } else if (view == rbTwo) {
        isChecked(2);
        Toast.makeText(getApplicationContext(), rbTwo.getText().toString(), Toast.LENGTH_SHORT).show();
    } else if (view == rbThree) {
        isChecked(3);
        Toast.makeText(getApplicationContext(), rbThree.getText().toString(), Toast.LENGTH_SHORT).show();
    } else if (view == rbFour) {
        isChecked(4);
        Toast.makeText(getApplicationContext(), rbFour.getText().toString(), Toast.LENGTH_SHORT).show();
    }
}
private void isChecked(int position) {
    switch (position) {
        case 1:
            rbTwo.setChecked(false);
            rbThree.setChecked(false);
            rbFour.setChecked(false);
            break;
        case 2:
            rbOne.setChecked(false);
            rbThree.setChecked(false);
            rbFour.setChecked(false);
            break;
        case 3:
            rbOne.setChecked(false);
            rbTwo.setChecked(false);
            rbFour.setChecked(false);
            break;
        case 4:
            rbOne.setChecked(false);
            rbTwo.setChecked(false);
            rbThree.setChecked(false);
            break;
    }
}
<RadioGroup
    android:id="@+id/rgMemberShip"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <RadioButton
            android:id="@+id/rbOne"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="One Time"
            android:textSize="16sp" />
        <RadioButton
            android:id="@+id/rbTwo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="80dp"
            android:text="One Time"
            android:textSize="16sp" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <RadioButton
            android:id="@+id/rbThree"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="One Time"
            android:textSize="16sp" />
        <RadioButton
            android:id="@+id/rbFour"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="80dp"
            android:text="One Time"
            android:textSize="16sp" />
    </LinearLayout>
</RadioGroup>