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Androidで同一Dialogを2回表示すると、「java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.」というエラーが発生する。

private AlertDialog dialog;

public void showDialog() {
    if(dialog == null) {
        dialog = new AlertDialog.Builder(this)
        .setPositiveButton(R.string.tutorial1_positive, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {}
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