背景                                                                                            

我们以常见的登录的时候有CheckBox来显示是否保存帐号密码的形式来生动的讲解这个故事。

最后是以txt文档保存，用到的是Java的IO操作。

这个只是粗略的，大家不喜勿喷。

保存文件                                                                                      

public static void savefile2card(Context context,String username,String password)    {        File file = null;        FileOutputStream fos = null;        try         {        //    file = new File("/data/data/com.yuyidong.savefile/savefile.txt");            file = new File(context.getFilesDir(),"info.txt");            fos = new FileOutputStream(file);            fos.write((username+"!!!!"+password).getBytes());            }         catch (Exception e)         {            // TODO 自动生成的 catch 块            e.printStackTrace();            try             {                fos.close();            }             catch (IOException e1)             {                // TODO 自动生成的 catch 块                e1.printStackTrace();            }        }    }

读取文件                                                                                      

public static Map
     
       getSaveFile(Context context)    {        File file =new File(context.getFilesDir(),"info.txt");                try         {            FileInputStream fis = new FileInputStream(file);            BufferedReader br = new BufferedReader(new InputStreamReader(fis));            String str = br.readLine();            String[] infos = str.split("!!!!");            Map
      
        map = new HashMap
       
        ();            map.put("username",infos[0]);            map.put("password", infos[1]);            br.close();            return map;        }         catch (Exception e)        {            // TODO 自动生成的 catch 块            e.printStackTrace();            return null;        }        finally        {            }        }
       
      
     

主程序                                                                                         

public class MainActivity extends Activity {    private Button button;    private CheckBox check;    private EditText usernameText;    private EditText passwordText;    private String username;    private String password;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.button);        check = (CheckBox) findViewById(R.id.check);

usernameText = (EditText) findViewById(R.id.username);                passwordText = (EditText) findViewById(R.id.password);

button.setOnClickListener(new buttonListener());

Map
     
       map = read.getSaveFile(this);        usernameText.setText(map.get("username"));        passwordText.setText(map.get("password"));    }        class buttonListener implements OnClickListener    {        @Override        public void onClick(View v) {            // TODO 自动生成的方法存根            username = usernameText.getText().toString();            password = passwordText.getText().toString();            System.out.println(username+"~!!~"+password);            if(check.isChecked())            {                                save.savefile2card(MainActivity.this, username, password);            }        }    }
     

                               我是天王盖地虎的分割线                                 

源代码：

saveFile.zip

 

 

 

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