java - 如何将多条语句打印到一个 TextView

Question

我有以下代码:

for(int i = 1; i <= doubleLength; i++) {
    doubleRate = (doubleBalance * (doubleRate/100))/12;
    doubleBalance = doubleBalance + doubleRate;
    doublePayment = (doubleBalance/doubleCount);

    TextView results = (TextView) findViewById(R.id.showResult);
    results.setText(doublePayment+"");

    doubleCount = doubleCount - 1;
    doubleBalance -= doublePayment;
}

我想做的是将“doublePayment”值的每个值打印到屏幕上的 TextView UI 对象。然而，当 for 循环结束时，它只打印出一个值，而不是多个。

我是从 C++ 移植的，所以我习惯于简单地使用 cout 来打印到终端。

Answer 1

问题出在这里:

results.setText(doublePayment+"");

您正在重新设置文本值，而不是附加整个字符串。更好的方法是使用 StringBuilder:

StringBuilder sb = new StringBuilder();
for(int i = 1; i <= doubleLength; i++) {
    doubleRate = (doubleBalance * (doubleRate/100))/12;
    doubleBalance = doubleBalance + doubleRate;
    doublePayment = (doubleBalance/doubleCount);

    sb.append(doublePayment);
    sb.append(" ");

    doubleCount = doubleCount - 1;
    doubleBalance -= doublePayment;
}
TextView results = (TextView) findViewById(R.id.showResult);
results.setText(sb.toString());