推荐的方式来获得砂浆屏幕内的活动？
我正在使用Mortar和Flow来驱动我的应用程序。 如果我有以下视图：
public class MyView extends LinearLayout {
@Inject MyScreen.Presenter presenter;
private EditText someText;
public MyView(Context context) {
super(context);
Mortar.inject(context, this);
}
@Override protected void onFinishInflate() {
super.onFinishInflate();
presenter.takeView(this);
}
@Override protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
presenter.dropView(this);
}
}
并在下面的屏幕上：
@Layout(R.layout.my_view)
public class MyScreen implements Blueprint {
@Override public String getMortarScopeName() {
return getClass().getName();
}
@Override public Object getDaggerModule() {
return new Module();
}
@dagger.Module(injects = MyView.class, addsTo = MyActivity.Module.class)
public class Module {
}
@Singleton
public class Presenter extends ViewPresenter<MyView> {
private final SomeAsyncService service;
@Inject
Presenter() { }
@Override public void onLoad(Bundle savedInstanceState) {
}
@Override public void onSave(Bundle outState) {
}
}
}
现在我想访问正在使用此屏幕和视图的活动。 我将有权访问一些Activity方法，如：
getWindow()
finish()
getLayoutInflater()
getFragmentManager()
etc
我试图在屏幕中投射一个像这样的背景：
Activity activity = (Activity)getView.getContext;
但是，这当然会引发以下异常：
java.lang.ClassCastException: mortar.MortarContextWrapper cannot be cast to
android.app.Activity
如何获得该活动？ 谢谢。
不确定，但Mortar不推荐直接使用活动实例？
这个凡人样本是有帮助的。 所以，我执行如下。
class WindowOwner extends Presenter<WindowOwner.Activity> {
interface Activity {
void addFragsToWindow(int flags);
}
public static class Config() {
final private int flags;
Config(int flags) { this.flags = flags; }
public int getFlags() { return this.flags; }
}
private Config config;
public void setConfig(Config config) {
this.config = config;
update();
}
private void update() {
WindowOwner.Activity activity = getView();
if (activity != null) {
activity.addFlagsToWindow(config.getFlags());
}
}
@dagger.Module(injects = {}, library = true)
public static class WindowOwnerModule {
@Provides
@Singleton
WindowOwner provideWindowOwnerPersenter() { return new WindowOwner(); }
}
}
你定义一个WindowOwner.Module ，并将这个类包含到你的模块中。
@Module(injects = {}, library = true)
public class AndroidModule {
// WindowOwner provider
@Provides
@Singleton
SystemBarOwner provideWindowOwnerPersenter() {
return new WindowOwner();
}
}
@Module(
includes = {
AndroidModule.class, // Includes your modules
},
injects = {
MainApplication.class
},
library = true
)
public final class MainModule {
private final MainApplication mApplication;
public MainModule(MainApplication application) {
mApplication = application;
}
@Provides
@Singleton
Application provideApplication() {
return mApplication;
}
}
并且你像下面一样实施Activivty。
class AwesomeActivity extends Activity implements WindowOwner.Activity {
@Inject WindowOwner windowOwner;
@Override
protected void onCreate(Bundle savedInstanceState) {
Mortar.inject(this, this);
this.windowOwner.takeView(this);
}
@Override
void addFragsToWindow(int flags) {
getWindow().addFlags(flags);
}
}
您可以通过WindowOwner使用
@Layout(R.layout.awesome_view)
public class AwesomeScreen implements Blueprint {
@Override
public String getMortarScopeName() {
return getClass().getName();
}
@Override
public Object getDaggerModule() {
return new Module(getViewState());
}
@dagger.Module(
injects = {
AwesomeView.class // inject your view
},
addsTo = MainModule.class,
library = true
)
public static class Module {
}
@Singleton
public static class Presenter extends ViewPresenter<AwesomeView> {
private final WindowOwner windowOwner;
@Inject
Presenter(WindowOwner windowOwner) {
this.windowOwner = systemBarOwner;
}
@Override
protected void onEnterScope(MortarScope scope) {
super.onEnterScope(scope);
// Update window flags via WindowOwner.Config
this.windowOwner.setConfig(new WindowOwner.Config(YOUR_FLAGS));
}
}
}