目前我可以将文本文件加载到 EditText 中。如果文本被更改并且用户尝试打开一个新文件“先保存？” 显示对话框。我遇到的问题不是保存工作文件（currentFile）而是保存在要打开的文件上。
我哪里错了？
File currentFile;
public boolean changed;
public boolean exists;
...
private void openFile(final File aFile){
String nullChk = et.getText().toString();
exists = true;
if(!changed || nullChk.matches("")){
try {
et.setText(new Scanner(aFile).useDelimiter("\\Z").next());
changed=false;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else{
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Save first?");
alert.setMessage("(Will be saved in the current working directory)");
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
String temptxt = et.getText().toString();
if(exists){
saveFile(aFile.getPath(), temptxt);
}else{
saveAs();
}
}
});
final File tempFile = aFile;
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
try {
et.setText(new Scanner(tempFile).useDelimiter("\\Z").next());
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
changed=false;
}
});
alert.show();
//currentFile = aFile;
}
}
private void saveFile(String sFileName, String sBody){
//Toast.makeText(this, exists +"", Toast.LENGTH_SHORT).show();
if (exists) {
try {
File tempfile = new File(sFileName);
FileWriter writer = new FileWriter(tempfile);
writer.write(sBody);
writer.flush();
writer.close();
changed=false;
Toast.makeText(this, "Saved", Toast.LENGTH_SHORT).show();
return;
} catch (IOException e) {
e.printStackTrace();
}
}else{
Toast.makeText(this, "Save as", Toast.LENGTH_SHORT).show();
saveAs();
}
}
private void saveAs(){
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Save as");
alert.setMessage("(Will be saved in the current working directory)");
// Set an EditText view to get user input
final EditText input = new EditText(this);
alert.setView(input);
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
String value = input.getText().toString();
String tmpText = et.getText().toString();
try {
File tempfile = new File(currentDirectory, value);
FileWriter writer = new FileWriter(tempfile);
writer.write(tmpText);
writer.flush();
writer.close();
changed=false;
fill(currentDirectory.listFiles());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
startActivityForResult(new Intent(MainActivity.this, NewFile.class),1);
dialog.dismiss();
}
});
alert.show();
}