java - AlertDialog.setButton 无法更改按钮文本？

Question

我设置了自定义 AlertDialog(实际上是自定义 TimePickerDialog)。我正在使用 OnShowListener，根据条件更新按钮文本。我已将这段代码放在一个单独的方法中:

private void changeState(){
    if(!SleepAlarm.isActive()){
        Log.d("RPod_MainActivity","SleepAlarm is NOT active");
        this.setButton(TimePickerDialog.BUTTON1,(CharSequence)MainActivity.currentContext.getResources().getText(R.string.sleep_enable), sleepEnable);
        this.setButton(TimePickerDialog.BUTTON2,(CharSequence)MainActivity.currentContext.getResources().getText(R.string.sleep_cancel), sleepDisable);
    }
    else{
        Log.d("RPod_MainActivity","SleepAlarm is active");
        this.setButton(TimePickerDialog.BUTTON1,(CharSequence)MainActivity.currentContext.getResources().getText(R.string.sleep_change), sleepEnable);
        this.setButton(TimePickerDialog.BUTTON2,(CharSequence)MainActivity.currentContext.getResources().getText(R.string.sleep_disable), sleepDisable);
    }
    this.setTitle(R.string.sleep_title);
}

一旦我按下 TimePickerDialog.BUTTON1 按钮，当我再次显示对话框时，条件就满足了，文本应该会改变。但事实并非如此。

我已经用 LogCat 检查过情况是否正常。第一次打开对话框时，我看到“SleepAlarm is NOT active”。按下第一个按钮后，再次打开对话框时，我会看到“SleepAlarm is active”...但是按钮文本是一样的!

这是字符串:

<string name="sleep_enable">Enable</string>
<string name="sleep_disable">Disable</string>
<string name="sleep_cancel">Cancel</string>
<string name="sleep_change">Change</string>

编辑:我使用以下代码创建了对话框:

showDialog(TIME_DIALOG_ID);

onCreateDialog 实现:

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case TIME_DIALOG_ID:
        // set time picker as current time
        timePicker = new SleepPickerDialog(this,this);
        return timePicker;
    }
    return null;
}

和 SleepPickerDialog(扩展 TimePickerDialog)构造函数:

public SleepPickerDialog(Context context, OnTimeSetListener listener){
    super(context, listener, MainActivity.sleep_hour, MainActivity.sleep_hour, true);
    changeState();
    this.setOnShowListener(showListener);
}

算法，onShowListener:

private DialogInterface.OnShowListener showListener = new DialogInterface.OnShowListener() {
    @Override
    public void onShow(DialogInterface dialog) {
        // Cambiar botones
        changeState();
    }
};

我遗漏了什么重要的东西？

查看解决方案的已接受答案评论。我在这里发布完整的代码更改:

public SleepPickerDialog(Context context, OnTimeSetListener listener){
    super(context, listener, MainActivity.sleep_hour, MainActivity.sleep_hour, true);
    this.setButton(BUTTON_POSITIVE,(CharSequence)MainActivity.currentContext.getResources().getText(R.string.sleep_enable), sleepEnable);
    this.setButton(BUTTON_NEGATIVE,(CharSequence)MainActivity.currentContext.getResources().getText(R.string.sleep_cancel), sleepDisable);
    this.setOnShowListener(showListener);
}


private void changeState(){
    if(!SleepAlarm.isActive()){
        this.getButton(BUTTON_POSITIVE).setText(R.string.sleep_enable);
        this.getButton(BUTTON_NEGATIVE).setText(R.string.sleep_cancel);
    }
    else{
        this.getButton(BUTTON_POSITIVE).setText(R.string.sleep_change);
        this.getButton(BUTTON_NEGATIVE).setText(R.string.sleep_disable);
    }
    this.setTitle(R.string.sleep_title);
}

Answer 1

看这个link按照这个它的工作原理

尝试

yourTimePickerDialog.getButton(whichButton).setText("New Text"); (put the null check if needed)

or 

yourTimePickerDialog.setButton(BUTTON_POSITIVE, "Find", yourTimePickerDialog);