数据存储--内部存储读写操作

1.保存数据

String Filename="test.txt";

//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

String Filename="test.txt";

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();