更改文本按钮,反之亦然Android

时间:2014-03-15 17:31:30

标签: java android button

我的xml中有这个按钮          

我想要使用它两次,一次用于更改另一个按钮值,而secod用于获取之前的值。

这就是我所拥有的:

public void cambia(View view) {
    boolean a = true;
    Button boton1 = (Button)this.findViewById(R.id.btnDividir);
    Button boton2 = (Button)this.findViewById(R.id.btnMultiplicar);
    Button boton3 = (Button)this.findViewById(R.id.btnRestar);
    Button boton4 = (Button)this.findViewById(R.id.btnSumar);
    if (a == true) {
        boton1.setText("/");
        boton2.setText("*");
        boton3.setText("-");
        boton4.setText("+");
        a = false;
    } else if(a == false) {
        boton1.setText("divide");
        boton2.setText("multiplica");
        boton3.setText("resta");
        boton4.setText("suma");
        a = true;
    }
}

但我的变量a将始终具有true的值,因此,如果用户想要更改它或将其恢复原状,我该如何使用该按钮来设置文本?

1 个答案:

答案 0 :(得分:1)

将该变量置于函数之外,作为全局变量。

class YourClass extends Activity{
    boolean a = true;
    ....
    ...
    public void cambia(View view) {
        Button boton1 = (Button)this.findViewById(R.id.btnDividir);
        Button boton2 = (Button)this.findViewById(R.id.btnMultiplicar);
        Button boton3 = (Button)this.findViewById(R.id.btnRestar);
        Button boton4 = (Button)this.findViewById(R.id.btnSumar);
        if (a == true) {
            boton1.setText("/");
            boton2.setText("*");
            boton3.setText("-");
            boton4.setText("+");
            a = false;
        } else {
            boton1.setText("divide");
            boton2.setText("multiplica");
            boton3.setText("resta");
            boton4.setText("suma");
            a = true;
        }
    }
}