我从Android 开发者页面获取了这段代码，但代码不起作用。我环顾四周，但似乎没有人给出明确的答案。
private void writetofile(String FILENAME, String content){
FileOutputStream outputStream;
try {
//The problem is here ↓
outputStream = openFileOutput(FILENAME, Context.MODE_PRIVATE);
outputStream.write(content.getBytes());
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
“openFileOutput”显然是未定义的。我如何编写代码以使其写入文件并且不会编译失败？
这是我的完整代码（如果有帮助的话）
public class HastighetFragment extends Fragment {
int color;
Button bAdd;
private void writetofile(String FILENAME, String content){
FileOutputStream outputStream;
try {
outputStream = openFileOutput(FILENAME, Context.MODE_PRIVATE);
outputStream.write(content.getBytes());
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_hastighet, container, false);
bAdd = (Button) rootView.findViewById(R.id.addbutton);
color=0;
bAdd.setOnClickListener(new OnClickListener() {@Override
public void onClick(View v) {
switch(color){
case 0:
bAdd.setBackgroundResource(R.drawable.buttonstylered);
color=1;
break;
case 1:
bAdd.setBackgroundResource(R.drawable.buttonstylegreen);
color=0;
break;
}
}});
return rootView;
}
public void onBackPressed() {
android.app.FragmentManager FragmentManager = getActivity().getFragmentManager();
FragmentManager.popBackStack();
}
}