数据存储--内部存储读写操作

[android]代码库

String Filename="test.txt"

1.保存数据
        //Context.MODE_PRIVATE表示只有本应用才能访问数据
        FileOutputStream outputStream = openFileOutput(FileName, Context.MODE_PRIVATE);
        BufferedWriter  writer = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
        writer.write("测试数据");
        //必须调用flush()和close()方法,不然根本没数据
        writer.flush();
        outputStream.flush();
        writer.close();
        outputStream.close();

2.读取数据

        FileInputStream inputStream=openFileInput(FileName);
        BufferedReader  reader=new BufferedReader(new InputStreamReader(inputStream));
        StringBuilder sBuilder = new StringBuilder();
        String line = "";
        while ((line = reader.readLine()) != null) {
            sBuilder.append(line);
        }
        textView.setText(sBuilder.toString());
        reader.close();
        inputStream.close();