java - 初始化数量

Question

我希望当我的应用程序启动时，它显示 2 作为初始数量。总是显示0。我该怎么办？

 /**
 * This method is called when the order button is clicked.
 */
public void submitOrder(View view) {
    int quantity = 2;

    displayPrice (quantity * 5);
}



/**
 * This method is called when plus button is clicked.
 */

public void increment(View view) {
    int quantity = 2;
    quantity = quantity + 1;

    display(quantity);

}
/**
 * This method is called when minus button is clicked.
 */
public void decrement(View view) {
    int quantity = 1;
    display (quantity);
}

Answer 1

您可以在 Activity 的 onCreate 方法中调用 display(2); 或编辑 xml 布局，使数量 TextView 的值默认为 2。