1.保存值

SharedPreferences sharedPreferences = getSharedPreferences("sms", MODE_PRIVATE);
SharedPreferences.Editor edit = sharedPreferences.edit();
edit.putString("content", "这是要保存的字符串");
edit.commit();

2.取值

SharedPreferences sharedPreferences = getSharedPreferences("sms", MODE_PRIVATE);
String content = sharedPreferences.getString("content", "");