暂停代码，直到用户在对话框提示下输入数据

Question

我有一个应用程序，允许用户键入文本并将其导出到txt文件。当用户按下保存按钮时，会出现一个对话框，询问用户他们希望如何命名文件。用户键入一个名称，该名称被视为字符串值，然后将其与".txt"连接为最终文件名。问题是程序会立即保存文件，而无需等待用户输入名称，因此它将使用字符串的先前值，即使它是 null。当它为空时，文件名将为"null.txt"。下次用户尝试保存文件时，应用程序将立即保存文件并使用之前在第一次尝试中输入的值，并像这样继续下去。

保存按钮：

saveBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        openDialog(); //Calls for the dialog pop-up
        exportText = resultText.getText().toString().trim(); //.trim() removes space before and after text
        if (!exportText.isEmpty()) {
            saveToTxtFile(exportText);
        } else {
            Toast.makeText(SpeechToText.this, "Input field empty...", Toast.LENGTH_SHORT).show();
        }
    }
});

保存的方法：

private void saveToTxtFile(String mText) {
    try {
        File path = Environment.getExternalStorageDirectory(); //path to storage
        File dir = new File(path + "/My App/Text Files/"); //create folders 
        dir.mkdirs();
        String fileName = inputName + ".txt"; 
        File file = new File(dir, fileName);
        //FileWriter class is used to store characters in file
        FileWriter fw = new FileWriter(file.getAbsolutePath());
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write(mText);
        bw.close();
        Toast.makeText(SpeechToText.this, "Saved successfully...", Toast.LENGTH_SHORT).show();
    } catch(Exception e) {
        //if anything goes wrong
        Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
    }
}

对话框弹出方法：

public void openDialog() {
    View view = (LayoutInflater.from(SpeechToText.this)).inflate(R.layout.user_input, null);
    AlertDialog.Builder alertBuilder = new AlertDialog.Builder(SpeechToText.this);
    alertBuilder.setView(view);
    final EditText userInput = view.findViewById(R.id.userInput);
    alertBuilder.setCancelable(true).setPositiveButton("Ok", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            inputName = String.valueOf(userInput.getText());
        }
    });
    Dialog dialog = alertBuilder.create();
    dialog.show();
}

Answer 1

在用户可以在对话框提示中输入文件名之前调用saveToTxtFile()。

只需在onClick Dialog 中调用它，inputName = String.valueOf(userInput.getText());后侦听器进行空检查。此外，如果您更改文件保存方法会更好

saveToTxtFile(String mText)

自

saveToTxtFile(String mText, String filename)

这样，您将确定传递给此方法的文件名。

喜欢这个

alertBuilder.setCancelable(true).setPositiveButton("Ok", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        inputName = String.valueOf(userInput.getText());
        if(inputName != "" && inputName != null)
           saveToTxtFile(exportText,inputName);
        else
           //Toast an error here
    }
});

同样在您的saveBtn单击侦听器呼叫openDialog()您在if (!exportText.isEmpty())体内调用saveToTxtFile(exportText);的位置。

喜欢这个：

exportText = resultText.getText().toString().trim(); //.trim() removes space before and after text
    if (!exportText.isEmpty()) {
         openDialog();
    } else {
        Toast.makeText(SpeechToText.this, "Input field empty...", Toast.LENGTH_SHORT).show();
    }

这样，它只会在文件内容不为空时询问文件名。

Answer 2

你应该实现一个附加到你的对话框的侦听器，例如——

        Dialog dialog;
    dialog = new Dialog(this);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.custom_dialog);
        dialog.show();

    TextView tv_message = (TextView) dialog .findViewById(R.id.textViewMessage);
    tv_message.setText(message);
    Button bt_yes = (Button)dialog.findViewById(R.id.buttonYes);
       Button bt_no = (Button)dialog.findViewById(R.id.buttonNo);
    bt_yes.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //HERE GOES YOUR CODE YOU WANT TO BE EXECUTED
// AFTER THE USER INOUTS ITS NAME AND HIT OK.
 exportText = resultText.getText().toString().trim(); //.trim() removes space before and after text
        if (!exportText.isEmpty()) {
            saveToTxtFile(exportText);
        } else {
            Toast.makeText(SpeechToText.this, "Input field empty...", Toast.LENGTH_SHORT).show();
        }
        }
    });
    bt_no.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dialog.dismiss();
        }
    });

Answer 3

这是未经测试的，但你可以尝试这样的事情......

您只应在窃听saveBtn时呼叫openDialog

saveBtn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        openDialog(); //Calls for the dialog pop-up
    }
});

然后，当将保存按钮添加到对话框中并在该点保存数据时。添加onShowListener将阻止对话框关闭，直到您需要它。

public void openDialog() {
View view = (LayoutInflater.from(SpeechToText.this)).inflate(R.layout.user_input, null);
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(SpeechToText.this);
alertBuilder.setView(view);
final EditText userInput = view.findViewById(R.id.userInput);
alertBuilder.setCancelable(true).setPositiveButton("Ok", null).setNegativeButton("Cancel", null);
Dialog dialog = alertBuilder.create();
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
   @Override
   public void onShow(DialogInterface dialog) {
        Button deleteAllButton = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
        deleteAllButton.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  inputName = String.valueOf(userInput.getText());
                  exportText = resultText.getText().toString().trim(); //.trim() removes space before and after text
                  if (!exportText.isEmpty()) {
                     saveToTxtFile(exportText);
                     dialog.dismiss();
                  } else {
                     Toast.makeText(SpeechToText.this, "Input field empty...", Toast.LENGTH_SHORT).show();
                  }
              }
    });
    Button cancelButton = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_NEUTRAL);
    cancelButton.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View view) {
               dialog.dismiss();
          }
    });
  }
 });
 dialog.show();
}