在textview上显示项目数组

Question

我需要在TextView中显示数组中的许多字符串值。我使用Runnable。但它只运行一次!如果我使用for循环，代码将抛出错误。

Runnable hMyTimeTask = new Runnable() {
    public void run() {
        nCounter++;
        label.setText(rates[nCounter]);
    }
};
try {
    handler.removeCallbacks(hMyTimeTask);
    handler.postDelayed(hMyTimeTask, 1000); // delay 1 second
} catch (Exception e) {
    e.printStackTrace();
}

使用for循环:

Runnable hMyTimeTask = new Runnable() {
    public void run() {
        for (int i = 0; i < rates.length; i++) {
            label.setText(rates[i]);
        }
    }
};
try {
    handler.removeCallbacks(hMyTimeTask);
    handler.postDelayed(hMyTimeTask, 1000); // delay 1 second
} catch (Exception e) {
    e.printStackTrace();
}

Answer 1

我使用runnable。但它只运行一次!

在你的Runnable中，你需要再次发布你的Runnable来重复它:

Runnable hMyTimeTask = new Runnable() {
    public void run() {
        nCounter++;
        if(nCounter >= rates.length)
            nCounter = 0;
        label.setText(rates[nCounter]);
        // Run this again
        handler.postDelayed(this, 1000); // delay 1 second
    }
};