android - 在android上创建确认对话框类

Question

我尝试制作自己的带有 bool 值的确认对话框类作为结果。我已阅读任何教程或建议，但结果并不如我所愿。

问题是我讨厌写长代码，我想写一个简单的代码。这个对比delphi和android写确认对话框

德尔福:

if MessageDlg ('消息文本', mtConfirmation, [mbYes, mbNo], 0)

安卓:

boolean answer = false;

public boolean Confirm (Activity act, String Title, String ConfirmText,
CancelBtn String, String OkBtn) {
  AlertDialog dialog = new AlertDialog.Builder (act). Create ();
  dialog.setTitle (Title);
  dialog.setMessage (ConfirmText);
  dialog.setCancelable (false);
  dialog.setButton (DialogInterface.BUTTON_POSITIVE, OkBtn,
  new DialogInterface.OnClickListener () {
    public void onClick (DialogInterface dialog, int buttonId) {
  answer = true;
  }
});
dialog.setButton (DialogInterface.BUTTON_NEGATIVE, CancelBtn,
new DialogInterface.OnClickListener () {
  public void onClick (DialogInterface dialog, int buttonId) {
    answer = false;
  }
});
dialog.setIcon (android.R.drawable.ic_dialog_alert);
return answer;
}

问题是我能否创建一个生成确认对话的类，将生成一个 bool 值 true 或 false，就像在 Delphi 中一样。

确认对话框，以便该类(class)可以在类或其他 Activity 中使用

Answer 1

Android 并不总是传统的。您不能显示一个对话框并等待它显示，然后再做一些事情。

您需要显示一个对话框，并在回调中响应是/否按钮。

这样的事情是一种解决方案:

/**
 * Display a confirm dialog. 
 * @param activity
 * @param title
 * @param message
 * @param positiveLabel
 * @param negativeLabel
 * @param onPositiveClick runnable to call (in UI thread) if positive button pressed. Can be null
 * @param onNegativeClick runnable to call (in UI thread) if negative button pressed. Can be null
 */
public static final void confirm(
        final Activity activity, 
        final int title, 
        final int message,
        final int positiveLabel, 
        final int negativeLabel,
        final Runnable onPositiveClick,
        final Runnable onNegativeClick) {

            AlertDialog.Builder dialog = new AlertDialog.Builder(activity);
            dialog.setTitle(title);
            dialog.setMessage(message);
            dialog.setCancelable (false);
            dialog.setPositiveButton(positiveLabel,
                    new DialogInterface.OnClickListener () {
                public void onClick (DialogInterface dialog, int buttonId) {
                    if (onPositiveClick != null) onPositiveClick.run();
                }
            });
            dialog.setNegativeButton(negativeLabel,
                    new DialogInterface.OnClickListener () {
                public void onClick (DialogInterface dialog, int buttonId) {
                    if (onNegativeClick != null) onNegativeClick.run();
                }
            });
            dialog.setIcon (android.R.drawable.ic_dialog_alert);
            dialog.show();

        }

}

要使用上述方法，可以使用类似这样的东西:

        Alert.confirm(activity, R.string.titFileExport, R.string.lblFileConfirmOverwrite, 
                R.string.yes, R.string.no, 
                new Runnable() { public void run() {performExport(activity, app, currentSong, saveFile);}}, 
                null);
        return;