我們需要這樣做以禁止用戶輸入空值作為文件名。除非 userInput 不為空，否則應(yīng)禁用保存按鈕。這是當(dāng)前代碼：public void openDialog() {    @SuppressLint("InflateParams") View view = (LayoutInflater.from(AudioRecorder.this)).inflate(R.layout.audio_name_input, null);    AlertDialog.Builder alertBuilder = new AlertDialog.Builder(AudioRecorder.this);    alertBuilder.setView(view);    final EditText userInput = view.findViewById(R.id.userInput);    alertBuilder.setCancelable(true);    alertBuilder.setPositiveButton("Save", new DialogInterface.OnClickListener() {        @Override        public void onClick(DialogInterface dialog, int which) {            inputName = String.valueOf(userInput.getText());            Toast.makeText(AudioRecorder.this, "Next audio clip will be named... " + inputName, Toast.LENGTH_SHORT).show();            filePathMaking();        }    });    alertBuilder.setNegativeButton("cancel", new DialogInterface.OnClickListener() {        @Override        public void onClick(DialogInterface dialogInterface, int i) {        }    });    Dialog dialog = alertBuilder.create();    dialog.show();}