android 开发最新框架搭建,Android 全新MVVM框架搭建
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)publicclassLoginActivityextendsBaseActivityimple...
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 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ViewModelpublic class LoginViewModel extends BaseViewModel 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()
Toast.makeText(context(), "账号不正确", Toast.LENGTH_SHORT).show(); return;
} if (pswd.length()
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"?>
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">
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" />
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" />
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($et_account$,$et_pswd$)" />
style="@style/text_childer"
android:text="返回码" />
android:id="@+id/tv_code"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:bind="$result.code$" />
style="@style/text_childer"
android:text="结果:" />
android:id="@+id/tv_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:bind="$result.msg$" />
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 { 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BaseActivitypublic abstract class BaseActivity 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IBaseViewpublic interface IBaseView { Context applicationContext(); Activity context();
}
BaseViewModel继承AbsViewmodel并实现IBaseViewModel,持有Briefnessor,View,Model。public abstract class BaseViewModel extends AbsViewModel 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 implements IBaseViewModel{ protected WeakReference mViewRef; protected WeakReference mBriefnessorRef; protected void attachView(T view) {
mViewRef = new WeakReference(view);
} protected void attachBriefnessor(Briefnessor briefnessor) {
mBriefnessorRef = new WeakReference(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 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();
}
}
作者:Android高级开发
链接:https://www.jianshu.com/p/ef99ff863650
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