Android 保存文件

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<String,String> 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<String,String> map = new HashMap<String, String>();

            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<String, String> 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：http://pan.baidu.com/s/1dD1Qx01

saveFile.zip

转载请注明出处：http://www.cnblogs.com/yydcdut/p/3708964.html