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.

@AllFavor  public 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!