Favor库简述

Favor是一个第三方库, 可以简化SharedPreferences, 使用依赖注入的方式声明. 我们根据常见的输入框, 把账户信息存在Favor的类中, 来看看这个库怎么用.

1. 准备

配置build.gradle

    compile 'com.cocosw:favor:0.2.0'    compile 'com.jakewharton:butterknife:7.0.1'

布局, 输入账户和密码, 下面两行小字显示保存在SharedPreferences中的数据.

<LinearLayout    ....>    <android.support.design.widget.TextInputLayout        android:id="@+id/user_name_wrapper"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="8dp">        <EditText            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:hint="Username"            android:inputType="textEmailAddress"/>    </android.support.design.widget.TextInputLayout>    <android.support.design.widget.TextInputLayout        android:id="@+id/password_wrapper"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="8dp">        <EditText            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:hint="Password"            android:inputType="textPassword"/>    </android.support.design.widget.TextInputLayout>    <Button        android:id="@+id/commit_button"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"        android:layout_marginTop="8dp"        android:background="@color/colorAccent"        android:text="登录"        android:textColor="@android:color/white"/>    <TextView        android:id="@+id/user_name_show"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="8dp"        android:text="username"/>    <TextView        android:id="@+id/password_show"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="password"/></LinearLayout>

使用TextInputLayout来绘制输入框.

页面逻辑, 验证邮箱和密码, 当输入正确时, 保存在SharedPreference里面, 并显示, 使用Favor库进行保存.

public class MainActivity extends AppCompatActivity {    private static final String EMAIL_PATTERN = "^[a-zA-Z0-9#_~!$&'()*+,;=:.\"(),:;<>@\\[\\]\\\\]+@[a-zA-Z0-9-]+(\\.[a-zA-Z0-9-]+)*$";    @Bind(R.id.user_name_wrapper) TextInputLayout mUserNameWrapper;    @Bind(R.id.password_wrapper) TextInputLayout mPasswordWrapper;    @Bind(R.id.user_name_show) TextView mUserNameShow;    @Bind(R.id.password_show) TextView mPasswordShow;    private Account mAccount; // 账户类    @OnClick(R.id.commit_button) void commitAccount(View view) {        hideKeyboard();        String username = mUserNameWrapper.getEditText().getText().toString();        String password = mPasswordWrapper.getEditText().getText().toString();        if (!validateEmail(username)) {            mUserNameWrapper.setError("邮箱地址错误");        } else if (!validatePassword(password)) {            mUserNameWrapper.setErrorEnabled(false);            mPasswordWrapper.setError("密码错误");            mPasswordWrapper.getEditText().setText("");        } else {            mUserNameWrapper.setErrorEnabled(false);            mPasswordWrapper.setErrorEnabled(false);            doLogin(username, password);            mUserNameShow.setText(mAccount.getUserName());            mPasswordShow.setText(mAccount.getPassword());        }    }    private void doLogin(String username, String password) {        mAccount.setUserName(username);        mAccount.setPassword(password);    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);        setSupportActionBar(toolbar);        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)                        .setAction("Action", null).show();            }        });        mAccount = new FavorAdapter.Builder(this).build().create(Account.class);        mUserNameShow.setText(mAccount.getUserName());        mPasswordShow.setText(mAccount.getPassword());    }    // 隐藏键盘    private void hideKeyboard() {        View view = getCurrentFocus();        if (view != null) {            ((InputMethodManager) getSystemService(INPUT_METHOD_SERVICE))                    .hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);        }    }    // 验证邮箱    private boolean validateEmail(String email) {        Pattern pattern = Pattern.compile(EMAIL_PATTERN);        Matcher matcher = pattern.matcher(email);        return matcher.matches();    }    // 验证密码    private boolean validatePassword(String password) {        return password.length() > 7;    }    ...}

2. Favor

初始化Favor类, 传入Context和Favor类型的类.

mAccount = new FavorAdapter.Builder(this).build().create(Account.class);

Account类, 必须要设定set和get方法, 名称相同, 可以提供默认值.

@AllFavorpublic interface Account {    void setUserName(String userName);    @Default("No Name") String getUserName();    void setPassword(String password);    @Default("000000") String getPassword();}

设置Favor类

    private void doLogin(String username, String password) {        mAccount.setUserName(username);        mAccount.setPassword(password);    }

使用Favor类

        mUserNameShow.setText(mAccount.getUserName());        mPasswordShow.setText(mAccount.getPassword());

Github下载地址

声明Favor的Interface, 就可以方便地使用SharedPreferences了.
Enjoy it!