这是完成的方式。以下示例代码在单击提交按钮后将详细信息保存到文件中：
Submit = (Button) findViewById(R.id.btnSubmit); //Instantiates the button in the onCreate method Submit.setonClickListener(new onClickListener(){ //Called when the user clicks on the Submit button @Override public void onClick(View v) { // In this case the text to be written is the selected text in a radio button from radioGroup int Selection = AttendanceGroup.getCheckedRadioButtonId(); // find the radiobutton by returned id RadioButton radiobutton = (RadioButton) findViewById(Selection); // write on SD card file data in the text box try { //gets the current date since this is an attendance app. Calendar c = Calendar.getInstance(); //Formats the date a desired SimpleDateFormat date = new SimpleDateFormat("dd-MM-yy"); String getDate = date.format(c.getTime()); //writes the text to the file named attendance.txt which is created in the phone. File myFile = new File("/sdcard/Albanapp/Attendance.txt"); FileWriter fOut = new FileWriter(myFile, true); fOut.append(getDate + "t" + getSelectedName.getSelectedItem().toString() + "t" + radiobutton.getText().toString() + "n"); fOut.flush(); fOut.close(); //Returns a statment to the user showing if the editing of the attendance.txt file was successful or not. Toast.makeText(getbaseContext(),"Status Saved", Toast.LENGTH_SHORT).show(); } catch (Exception e) { Toast.makeText(getbaseContext(), "Attendance cannot be saved", Toast.LENGTH_SHORT).show(); } } });希望这可以帮助 ：）
