java - 暂停代码，直到用户在对话框提示上输入数据

Question

我有一个应用程序，可以让用户输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，询问用户他们想如何命名文件。用户键入一个作为字符串值的名称，然后将其与“.txt”连接起来作为最终文件名。问题是程序会立即保存文件，而无需等待用户输入名称，因此它会使用字符串的先前值，即使它为空。为空时，文件名为“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先前在第一次尝试中输入的值并继续进行。

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();
}

标签： javaandroid

Answer 1

这是未经测试的，但你可以尝试这样的事情......

你应该只openDialog在saveBtn被点击时调用

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

然后在对话框中添加一个保存按钮并在该点保存数据。添加onShowListener将阻止对话框关闭，直到您需要它为止。

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();
}