我正在尝试从 .txt 文件中删除特定行，该文件存储在我的 android 手机上。这就是我尝试这样做的方式：
public void removeLineFrom (String filePath, String lineToRemove){
try {
File oldFile = new File(filePath);
File tempFile = new File(externalStoragePath + File.separator + "/Android/data/com.whizzappseasyvoicenotepad/temp file.txt");
BufferedReader br = new BufferedReader(new FileReader(filePath));
PrintWriter pw = new PrintWriter(new FileWriter(tempFile));
String line = null;
//Read from the original file and write to the new
//unless content matches data to be removed.
while ((line = br.readLine()) != null) {
if (!line.equals(lineToRemove)) {
pw.write(line);
pw.flush();
}
}
pw.close();
br.close();
//Delete the original file
oldFile.delete();
//Rename the new file to the filename the original file had.
tempFile.renameTo(recordedFiles);
}
catch (FileNotFoundException ex) {
ex.printStackTrace();
}
catch (IOException ex) {
ex.printStackTrace();
}
}
每次我这样调用这个方法：
removeLineFrom(externalStoragePath + File.separator +
"/Android/data/com.whizzappseasyvoicenotepad/recorded files.txt",
recordedFilesArray.get(toDelete));
应用程序崩溃。这是 logcat 错误：
08-08 15:24:22.225: E/AndroidRuntime(6146): java.lang.IndexOutOfBoundsException:
Invalid index 1, size is 1
它说问题出在上面发布的行中（调用方法）。我不知道为什么索引会无效。这是 toDelete 变量：
toDelete = arg2;
如果有人需要，整个 onItemLongClick：
listView.setOnItemLongClickListener(new OnItemLongClickListener(){
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
deleteAlert.setTitle("Warning");
deleteAlert.setMessage("Are you sure you want to delete this?");
toDelete = arg2;
deleteAlert.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
File directory = new File (externalStoragePath + File.separator + "Android/data/com.whizzappseasyvoicenotepad/");
File deleteFile = new File (directory, recordedFilesArray.get(toDelete) + ".mp3");
deleteFile.delete();
Log.i("TAG", "Deleting file: " + directory + recordedFilesArray.get(toDelete) + ".mp3");
listAdapter.remove(listAdapter.getItem(toDelete));
listAdapter.notifyDataSetChanged();
removeLineFrom(externalStoragePath + File.separator + "/Android/data/com.whizzappseasyvoicenotepad/recorded files.txt", recordedFilesArray.get(toDelete));
Toast toast = Toast.makeText(getApplicationContext(), "Deleted", Toast.LENGTH_SHORT);
toast.show();
dialog.dismiss();
}
});
deleteAlert.setNegativeButton("No", null);
deleteAlert.show();
return false;
}
});