Android 使用mvvp结构中的数据绑定导航到另一个活动
我正在学习数据绑定库,对此我是全新的。我的问题是如何导航到另一个关于数据绑定的活动 我可以像在MVC中那样做吗?或者我必须把代码放在ViewModel中。请帮帮我 这是我的密码 活动:Android 使用mvvp结构中的数据绑定导航到另一个活动,android,mvvm,android-databinding,android-mvvm,Android,Mvvm,Android Databinding,Android Mvvm,我正在学习数据绑定库,对此我是全新的。我的问题是如何导航到另一个关于数据绑定的活动 我可以像在MVC中那样做吗?或者我必须把代码放在ViewModel中。请帮帮我 这是我的密码 活动: public class SplashActivity extends AppCompatActivity implements Observer { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreat
public class SplashActivity extends AppCompatActivity implements Observer {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initDataBinding();
initViews();
}
private void initViews() {
findViewById(R.id.guest_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(SplashActivity.this,GameActivity.class));
}
});
}
private void initDataBinding() {
ActivitySplashBinding activitySplashBinding = DataBindingUtil.setContentView(this, R.layout.activity_splash);
SplashViewModel splashViewModel = new SplashViewModel();
activitySplashBinding.setSplashViewModel(splashViewModel);
splashViewModel.addObserver(this);
}
@Override
public void update(Observable observable, Object data) {
}
}
<?xml version="1.0" encoding="utf-8"?>
<layout 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"
tools:context="com.sevenbits.android.mvvmsample.view.SplashActivity">
<data>
<variable name="splashViewModel"
type="com.sevenbits.android.mvvmsample.viewmodel.SplashViewModel"/>
</data>
<android.support.constraint.ConstraintLayout
android:id="@+id/parent1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/splash_bg">
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:gravity="center"
android:text="Login"
android:textColor="@color/white"
android:textSize="24sp"
android:id="@+id/login_button"
app:layout_constraintBottom_toTopOf="@+id/parent1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="@id/parent1"
app:layout_constraintVertical_bias="0.42"/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:gravity="center"
android:text="Sign Up"
android:textColor="@color/white"
android:textSize="24sp"
android:id="@+id/sign_up_button"
app:layout_constraintBottom_toTopOf="@+id/parent1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="@id/parent1"
app:layout_constraintVertical_bias="0.58"/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:textColor="@color/white"
android:textAllCaps="false"
android:textSize="18sp"
android:id="@+id/guest_button"
android:layout_marginBottom="20dp"
android:text="Play As a Guest User"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
/>
</android.support.constraint.ConstraintLayout>
</layout>
XML:
public class SplashActivity extends AppCompatActivity implements Observer {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initDataBinding();
initViews();
}
private void initViews() {
findViewById(R.id.guest_button).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(SplashActivity.this,GameActivity.class));
}
});
}
private void initDataBinding() {
ActivitySplashBinding activitySplashBinding = DataBindingUtil.setContentView(this, R.layout.activity_splash);
SplashViewModel splashViewModel = new SplashViewModel();
activitySplashBinding.setSplashViewModel(splashViewModel);
splashViewModel.addObserver(this);
}
@Override
public void update(Observable observable, Object data) {
}
}
<?xml version="1.0" encoding="utf-8"?>
<layout 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"
tools:context="com.sevenbits.android.mvvmsample.view.SplashActivity">
<data>
<variable name="splashViewModel"
type="com.sevenbits.android.mvvmsample.viewmodel.SplashViewModel"/>
</data>
<android.support.constraint.ConstraintLayout
android:id="@+id/parent1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/splash_bg">
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:gravity="center"
android:text="Login"
android:textColor="@color/white"
android:textSize="24sp"
android:id="@+id/login_button"
app:layout_constraintBottom_toTopOf="@+id/parent1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="@id/parent1"
app:layout_constraintVertical_bias="0.42"/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:gravity="center"
android:text="Sign Up"
android:textColor="@color/white"
android:textSize="24sp"
android:id="@+id/sign_up_button"
app:layout_constraintBottom_toTopOf="@+id/parent1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="@id/parent1"
app:layout_constraintVertical_bias="0.58"/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:textColor="@color/white"
android:textAllCaps="false"
android:textSize="18sp"
android:id="@+id/guest_button"
android:layout_marginBottom="20dp"
android:text="Play As a Guest User"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
/>
</android.support.constraint.ConstraintLayout>
</layout>
我是否需要在视图模型中放置onclick代码?如果是,那么怎么做呢?好吧,这确实取决于用例,但理想情况下,每个操作都应该通过ViewModel 如果您需要在导航之前做一些事情,比如存储数据,那么您的单击操作应该从ViewModel开始。若你们只需要重定向,你们可以用MVC的方式 我通常是这样做的: SplashViewModel.java
public static final int ACTION_NAVIGATE_TO_GAME = 1000;
public void navigateToGame() {
// You can do some work here before notifying the view about redirection
setChanged();
notifyObserver(ACTION_NAVIGATE_TO_GAME);
}
SplashActivity.java
@Override
public void update(Observable observable, Object data) {
if (data instanceof Integer) {
int value = (int) data;
switch(value) {
case SplashViewModel.ACTION_NAVIGATE_TO_GAME:
startActivity(new Intent(SplashActivity.this,GameActivity.class));
break;
}
}
}
和布局文件中的
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:textColor="@color/white"
android:textAllCaps="false"
android:textSize="18sp"
android:id="@+id/guest_button"
android:layout_marginBottom="20dp"
android:text="Play As a Guest User"
android:onClick="@{() -> splashViewModel.navigateToGame()}"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
/>
谢谢您的帮助。