使用FileOutputStream保存文件不会创建任何文件

Question

Currently I'm developing an android app where the user has to click on a button this adds +1 to a count. After 100 there is another button which causes a reset of the count and increase the level and difficulty which is stored in another 2 "ints". Well its all working but I seriously have big problems with creating a save file.

1. -I gave me the permission via AndroidManifest.xml
2. -Tryed 3 other code examples
3. • I did import everything that is necessary and the rest of the code is working

There has to be a mistake in this part of my code:

(my part for the Saving the "Stats")

save.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            try {
                FileOutputStream savelvl = openFileOutput("savelvl.data", Context.MODE_PRIVATE);
                savelvl.write(level);
                savelvl.close();

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }


        }
    });

can anyone suggest an improvement to the code or tell me the mistake in saving the file to the internal storage?

Answer 1

You cannot flush your data. When you use writer you must call flush method after write method.

OutputStrem stream = ... // I cannot create new reference because "OutStream" class is abstract
stream.write(data, offset, length);
stream.flush();
stream.close();

Answer 2

I've had success with using a BufferedWriter instead of FileOutputStream, although I'm sure it could given a different setup. Below is some code with "FileOutputStream out", which I was trying to use initially, commented out.

BufferedWriter writer = null;
        try {
            writer = new BufferedWriter(new FileWriter(file,true));
            //out = new FileOutputStream(file);
            Log.i("file","file opened");
            writer.write(someString);
            //out.write(someString.getBytes());
            Log.i("file","file written");
        } catch (Exception e) {
            Log.e("fileNotFound","file not found exception");
            e.printStackTrace();
        }/*
        try {
            out.write(someString.getBytes());
            Log.i("file","file written");
            Log.i("str2File",someString.getBytes().toString());
        } catch (IOException e) {
            Log.e("fileWrite","file write error");
            e.printStackTrace();
        }*/ finally {
            try {
                //out.getFD().sync();
                //out.close();
                writer.close();
                Log.i("file","file closed");
            } catch (Exception e) {
                Log.e("closeError","error closing file");
                e.printStackTrace();
            }
        }