闲话不多少，还是老套路，处理一个登陆的业务。详细的介绍MVVM我就不多说了，网上一大把，毕竟吹水还是我的弱项。
主要实现的功能有两个输入框，一个登陆按钮，两个TextView显示登陆结果。
秀一把我的LoginActivity
@BindLayout(R.layout.activity_login)
public class LoginActivity extends BaseActivity<ILoginViewModel, LoginActivityBriefnessor> implements ILoginView {
@Override
protected ILoginViewModel createViewModel(LoginActivityBriefnessor briefnessor) {
return new LoginViewModel(this, briefnessor);
}
}
是不是超级简洁，点击事件呢？怎么不见了，再看一看ViewModel
public class LoginViewModel extends BaseViewModel<ILoginView, ILoginModel, LoginActivityBriefnessor> implements ILoginViewModel {
public LoginViewModel(ILoginView view, LoginActivityBriefnessor briefnessor) {
super(view, briefnessor);
}
@Override
protected ILoginModel createModel() {
return new LoginModel(this);
}
@Override
public void onLoginClick(String account, String pswd) {
if (account.length() < 3) {
Toast.makeText(context(), "账号不正确", Toast.LENGTH_SHORT).show();
return;
}
if (pswd.length() < 3) {
Toast.makeText(context(), "密码不正确", Toast.LENGTH_SHORT).show();
return;
}
model.login(account, pswd);
}
@Override
public void callbackLogin(LoginResult result) {
briefnessor.setResult(result);
}
}
ViewModel制作了登陆的数据验证，以及登陆回调的实现，model层完成模拟了登陆。
整个登陆的业务流程Activity并没有参与，在这其中就不得不提一个关键的中间件Briefness，它连接了View层与Model层，帮我们实现了数据绑定，以及事件传递。
我们先看一看布局是如何实现的
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:imports="com.hacknife.demo.bean.LoginResult,result"a
app:viewModel="com.hacknife.demo.mvvm.viewmodel.ILoginViewModel"
tools:ignore="MissingPrefix">
<EditText
android:id="@+id/et_account"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginHorizontal="40dp"
android:layout_marginVertical="10dp"
android:hint="账号" />
<EditText
android:id="@+id/et_pswd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginHorizontal="40dp"
android:layout_marginVertical="10dp"
android:hint="密码" />
<Button
android:id="@+id/btn_login"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginHorizontal="40dp"
android:layout_marginVertical="10dp"
android:text="登陆"
app:transfer="onLoginClick($et_account$,$et_pswd$)" />
<LinearLayout style="@style/text_parent" android:layout_marginHorizontal="40dp">
<TextView
style="@style/text_childer"
android:text="返回码" />
<TextView
android:id="@+id/tv_code"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:bind="$result.code$" />
</LinearLayout>
<LinearLayout style="@style/text_parent" android:layout_marginHorizontal="40dp">
<TextView
style="@style/text_childer"
android:text="结果:" />
<TextView
android:id="@+id/tv_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:bind="$result.msg$" />
</LinearLayout>
</LinearLayout>
布局中，根布局绑定了ViewModel，以及用于展示登陆结果的数据源。登陆按钮传递单击登陆事件，剩下的两个textView绑定相应的字段。
同时在对应的Activity上绑定相应的布局文件，Briefness就能暂时他强大的功能了，它会自动生成[类名+Briefnessor]的类。
public class LoginActivityBriefnessor implements Briefnessor<LoginActivity> {
public EditText et_account;
public EditText et_pswd;
public Button btn_login;
public TextView tv_code;
public TextView tv_msg;
public LoginResult result;
public ILoginViewModel viewModel;
@Override
public void bind(final LoginActivity host, Object source) {
if (!Utils.contentViewExist(host)) {
host.setContentView(R.layout.activity_login);
}
et_account = (EditText) host.findViewById(R.id.et_account);
et_pswd = (EditText) host.findViewById(R.id.et_pswd);
btn_login = (Button) host.findViewById(R.id.btn_login);
tv_code = (TextView) host.findViewById(R.id.tv_code);
tv_msg = (TextView) host.findViewById(R.id.tv_msg);
btn_login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
viewModel.onLoginClick(et_account.getText().toString().trim() , et_pswd.getText().toString().trim());
}
});
}
@Override
public void clear() {
this.result = null;
this.viewModel = null;
}
@Override
public void clearAll() {
this.result = null;
this.viewModel = null;
this.et_account = null;
this.et_pswd = null;
this.btn_login = null;
this.tv_code = null;
this.tv_msg = null;
}
@Override
public void bindViewModel(Object viewModel) {
this.viewModel = (ILoginViewModel) viewModel;
}
public void setResult(LoginResult result) {
if (result == null) return;
this.result = result;
BriefnessInjector.injector(tv_code,result.getCode());
BriefnessInjector.injector(tv_msg,result.getMsg());
}
}
该类实现了数据绑定，以及向ViewModel发送消息附带输入框中的值。
Briefness的具体用法，请参考https://github.com/hacknife/briefness
下面说一说BaseActivity
public abstract class BaseActivity<T extends IBaseViewModel,B extends Briefnessor> extends AppCompatActivity implements IBaseView {
protected T viewModel;
protected B briefnessor;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
briefnessor = (B )Briefness.bind(this);
viewModel = createViewModel(briefnessor);
briefnessor.bindViewModel(viewModel);
initView();
}
protected abstract T createViewModel(B briefnessor);
@Override
protected void onDestroy() {
super.onDestroy();
if (viewModel != null)
viewModel.dettachView();
}
protected void initView() {
}
@Override
public Context applicationContext() {
return getApplication();
}
@Override
public Activity context() {
return this;
}
}
BaseActivity中初始化了Briefness并创建ViewModel绑定到Briefness，并实现了IBaseView
public interface IBaseView {
Context applicationContext();
Activity context();
}
BaseViewModel继承AbsViewmodel并实现IBaseViewModel，持有Briefnessor，View，Model。
public abstract class BaseViewModel<V extends IBaseView, M extends IBaseModel, B extends Briefnessor> extends AbsViewModel<V> implements IBaseViewModel {
protected V view;
protected M model;
protected B briefnessor;
public BaseViewModel(V view, B briefnessor) {
this.attachView(view);
this.attachBriefnessor(briefnessor);
this.view = getView();
this.briefnessor = (B) getBriefnessor();
model = createModel();
}
protected abstract M createModel();
@Override
public Context applicationContext() {
return view.applicationContext();
}
@Override
public Activity context() {
return view.context();
}
}
AbsViewModel 的作用主要是释放相应的连接关系。
public abstract class AbsViewModel<T> implements IBaseViewModel{
protected WeakReference<T> mViewRef;
protected WeakReference<Briefnessor> mBriefnessorRef;
protected void attachView(T view) {
mViewRef = new WeakReference<T>(view);
}
protected void attachBriefnessor(Briefnessor briefnessor) {
mBriefnessorRef = new WeakReference<Briefnessor>(briefnessor);
}
protected T getView() {
return mViewRef.get();
}
protected Briefnessor getBriefnessor() {
return mBriefnessorRef.get();
}
public boolean isViewAttached() {
return mViewRef != null && mViewRef.get() != null & mBriefnessorRef != null & mBriefnessorRef.get() != null;
}
public void dettachView() {
if (mViewRef != null) {
mViewRef.clear();
mViewRef = null;
}
if (mBriefnessorRef != null) {
mBriefnessorRef.clear();
mBriefnessorRef = null;
}
}
}
BaseModel 持有ViewModel，并实现了IBaseView。
public abstract class BaseModel<VM extends IBaseViewModel> implements IBaseModel {
protected VM viewModel;
public BaseModel(VM viewModel) {
this.viewModel = viewModel;
}
@Override
public Context applicationContext() {
return viewModel.applicationContext();
}
@Override
public Activity context() {
return viewModel.context();
}
}
写的不好，请多多见谅。
如果还有什么不明白的，代码直通车https://github.com/hacknife/Briefness/tree/master/example/src/main/java/com/hacknife/demo/mvvm
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