因此，我想在彈出警報對話框時檢測用戶按下的按鈕。這是我的代碼。public class AlertUtils { private int BTN_PRESSED; private AlertDialog.Builder builder; public AlertUtils(Context context){ builder = new AlertDialog.Builder(context); } public int ShowAlertWithTwoButtons(String Title,String Message,String PositiveButtonText, String NegativeButtonText){ builder.setTitle(Title); builder.setMessage(Message); builder.setPositiveButton(PositiveButtonText, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { BTN_PRESSED = i; } }); builder.setNegativeButton(NegativeButtonText, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { BTN_PRESSED = i; dialogInterface.dismiss(); } }); builder.show(); return BTN_PRESSED; }}通過調(diào)用ShowAlertWithTwoButtons方法，返回檢測正或負按鈕按下的 int 值。我的問題是當(dāng)我從警報對話框中選擇時它給了我默認的 0 值，當(dāng)我再次打開我們的警報對話框時，它返回正確的值。
2 回答
繁花如伊
TA貢獻2012條經(jīng)驗 獲得超12個贊
您總能獲得BTN_PRESSED與0價值，只要你在你的實例化AlertUtils對象和調(diào)用ShowAlertWithTwoButtons方法。但是如果你ShowAlertWithTwoButtons再次回憶，你會得到另一個值。
我認為您目前正在做的事情如下：
// First, you're instantiating the object
AlertUtils alertUtils = new AlertUtils(getContext());
// then you're calling the method
int pressedButton = alertUtils.ShowAlertWithTwoButtons("title", "message", "yes", "no");
// which will return pressedButton as 0
// then you calling the method again after clicked yes or no
int anotherPressedButton = alertUtils.ShowAlertWithTwoButtons("title", "message", "yes", "no");
// which will not zero. But can be -1, -2, -3 like in the
// https://developer.android.com/reference/android/content/DialogInterface.html
由于AlertDialog 接口的異步特性，如果想在點擊后直接獲取按鈕值，這是不正確的。
相反，您需要向 AlertUtils 添加一個偵聽器（哦，不，另一個偵聽器）。
更新
您需要為單擊按鈕添加另一個偵聽器，如下所示：
public class AlertUtils {
public interface Listener {
void onButtonClicked(int pressedButton);
}
private Listener mListener;
private AlertDialog.Builder builder;
public AlertUtils(Context context, Listener listener){
builder = new AlertDialog.Builder(context);
mListener = listener;
}
public void ShowAlertWithTwoButtons(String Title,String Message,String PositiveButtonText,
String NegativeButtonText){
...
builder.setPositiveButton(PositiveButtonText, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onButtonClicked(i);
}
});
builder.setNegativeButton(NegativeButtonText, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
mListener.onButtonClicked(i);
dialogInterface.dismiss();
}
});
builder.show();
}
}
然后您可以使用以下方法創(chuàng)建和調(diào)用該方法：
// create the listener to listen for the clicked button.
AlertUtils.Listener listener = new AlertUtils.Listener() {
@Override
public void onButtonClicked(int pressedButton) {
// here you'll receive the button value
// do something here.
}
};
AlertUtils alertUtils = new AlertUtils(getContext(), listener);
// then you're calling the method
alertUtils.ShowAlertWithTwoButtons("title", "message", "yes", "no");
青春有我
TA貢獻1784條經(jīng)驗 獲得超8個贊
用這種方法試試。像這樣制作 AlertUtils 類。
public class AlertUtils {
private AlertDialog.Builder builder;
private AlertDialogListener alertDialogListener;
// Interface to send back the response of click
interface AlertDialogListener {
void onClick(int a);
}
public AlertUtils(Context context, AlertDialogListener alertDialogListener) {
builder = new AlertDialog.Builder(context);
this.alertDialogListener = alertDialogListener;
}
public void ShowAlertWithTwoButtons(String Title, String Message, String PositiveButtonText,
String NegativeButtonText) {
builder.setTitle(Title);
builder.setMessage(Message);
builder.setPositiveButton(PositiveButtonText, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
// if you want to pass the actual value of i,then pass the i in onClick or if you want 1 on
// positive button click then pass 1 here.
alertDialogListener.onClick(1);
}
});
builder.setNegativeButton(NegativeButtonText, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
// if you want to pass the actual value of i, then pass the i in onClick or if you want 1 on
// negative button click then pass 0 here.
alertDialogListener.onClick(0);
dialogInterface.dismiss();
}
});
builder.show();
}
}
在您需要的地方以這種方式調(diào)用對話框。
AlertUtils alertUtils = new AlertUtils(getContext(), new AlertUtils.AlertDialogListener() {
@Override
public void onClick(int a) {
if (a == 1) {
// Do your work on Positive button click
} else {
// Do your work on Negative button click
}
}
});
alertUtils.ShowAlertWithTwoButtons("Alert Dialog", "Alert Dialog Description ", "Positive", "Negative");
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