JetPack学习总结
NavController controller = Navigation.findNavController(v);
controller.navigate(R.id.action_testHomeFragment_to_testDetailFragment);
Navigation graph中直接设置转换动画,极大减少了工作量。当然如果对自带动画效果不满意,也可以创建Animation资源自己编写xml文件来创建动画。
NavHost:一个容器,用于显示
NavController:控制跳转流程
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="335dp"
app:layout_constraintGuide_percent="0.5" />
getView().findViewById(R.id.button2).setOnClickListener(Navigation.createNavigateOnClickListener(R.id.action_testDetailFragment_to_testHomeFragment));
NavController controller = Navigation.findNavController(v);
controller.navigate(R.id.action_testHomeFragment_to_testDetailFragment);
NavHostFragment
public class NavHostFragment extends Fragment implements NavHost {
public interface NavHost {
clazz = Class.forName(name, true, context.getClassLoader());
Class.forName
public static final class Builder {
public Builder() {
}
@NonNull
public Builder setLaunchSingleTop(boolean singleTop) {
mSingleTop = singleTop;
return this;
}
@NonNull
public NavOptions build() {
return new NavOptions(mSingleTop, mPopUpTo, mPopUpToInclusive,
mEnterAnim, mExitAnim, mPopEnterAnim, mPopExitAnim);
}
Builder.build
NavAction NavArgument NavOptions
Method valueMethod = clazz.getDeclaredMethod("values");
clazz.getDeclaredMethod
NavArgument
A annotation = getDeclaredAnnotation(annotationClass);
getDeclaredAnnotation
public class NavController {
class NavControllerViewModel extends ViewModel {
NavControllerViewModel
ViewModel
NavControllerViewModel
@NonNull
static NavControllerViewModel getInstance(ViewModelStore viewModelStore) {
ViewModelProvider viewModelProvider = new ViewModelProvider(viewModelStore, FACTORY);
return viewModelProvider.get(NavControllerViewModel.class);
}
private static final ViewModelProvider.Factory FACTORY = new ViewModelProvider.Factory() {
@NonNull
@Override
@SuppressWarnings("unchecked")
public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
NavControllerViewModel viewModel = new NavControllerViewModel();
return (T) viewModel;
}
};
public class ViewModelProvider {
public interface Factory {
@NonNull
<T extends ViewModel> T create(@NonNull Class<T> modelClass);
}
}
abstract static class KeyedFactory implements Factory {
@NonNull
@Override
public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
throw new UnsupportedOperationException("create(String, Class<?>) must be called on "
+ "implementaions of KeyedFactory");
}
}
public ViewModelProvider(@NonNull ViewModelStore store, @NonNull Factory factory) {
mFactory = factory;
}
public <T extends ViewModel> T get(@NonNull String key, @NonNull Class<T> modelClass) {
viewModel = ((KeyedFactory) (mFactory)).create(key, modelClass);
}
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