我尝试自己支持MvpConstraintLayout，只需从MvpLinearLayout复制代码
public abstract class MvpConstraintLayout<V extends MvpView, P extends MvpPresenter<V>>
extends ConstraintLayout implements MvpView, ViewGroupDelegateCallback<V, P> {
protected P presenter;
protected ViewGroupMvpDelegate<V, P> mvpDelegate;
public MvpConstraintLayout(Context context) {
super(context);
}
public MvpConstraintLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MvpConstraintLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
/**
* Get the mvp delegate. This is internally used for creating presenter, attaching and detaching
* view from presenter etc.
*
* <p><b>Please note that only one instance of mvp delegate should be used per android.view.View
* instance</b>.
* </p>
*
* <p>
* Only override this method if you really know what you are doing.
* </p>
*
* @return {@link ViewGroupMvpDelegate}
*/
@NonNull
protected ViewGroupMvpDelegate<V, P> getMvpDelegate() {
if (mvpDelegate == null) {
mvpDelegate = new ViewGroupMvpDelegateImpl<>(this, true);
}
return mvpDelegate;
}
@Override protected void onAttachedToWindow() {
super.onAttachedToWindow();
getMvpDelegate().onAttachedToWindow();
}
@Override protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
getMvpDelegate().onDetachedFromWindow();
}
@SuppressLint("MissingSuperCall") @Override protected Parcelable onSaveInstanceState() {
return getMvpDelegate().onSaveInstanceState();
}
@SuppressLint("MissingSuperCall") @Override
protected void onRestoreInstanceState(Parcelable state) {
getMvpDelegate().onRestoreInstanceState(state);
}
/**
* Instantiate a presenter instance
*
* @return The {@link MvpPresenter} for this view
*/
public abstract P createPresenter();
@Override public P getPresenter() {
return presenter;
}
@Override public void setPresenter(P presenter) {
this.presenter = presenter;
}
@Override public V getMvpView() {
return (V) this;
}
@Override public final Parcelable superOnSaveInstanceState() {
return super.onSaveInstanceState();
}
@Override public final void superOnRestoreInstanceState(Parcelable state) {
super.onRestoreInstanceState(state);
}
}
然后，在代码中使用它
public class StatusBarLayout extends MvpConstraintLayout<StatusView, StatusPresenter>
implements StatusView {
public StatusBarLayout(Context context) {
super(context);
init();
}
public StatusBarLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public StatusBarLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
ButterKnife.bind(this, this);
}
@Override
public StatusPresenter createPresenter() {
return DaggerStatusBarLayoutComponent.builder().build().presenter();
}
private void init() {
View.inflate(getContext(), R.layout.layout_status, this);
}
}
在预览中，IDE说
java.lang.IllegalStateException: Could not find the surrounding Activity
at com.hannesdorfmann.mosby3.PresenterManager.getActivity(PresenterManager.java:231)
at com.hannesdorfmann.mosby3.mvp.delegate.ViewGroupMvpDelegateImpl.<init>(ViewGroupMvpDelegateImpl.java:70)
at com.skybornecn.ifdive.widgets.MvpConstraintLayout.getMvpDelegate(MvpConstraintLayout.java:55)
at com.skybornecn.ifdive.widgets.MvpConstraintLayout.onAttachedToWindow(MvpConstraintLayout.java:63)
at android.view.View.dispatchAttachedToWindow(View.java:15395)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2953)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2960)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2960)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2960)
at android.view.AttachInfo_Accessor.setAttachInfo(AttachInfo_Accessor.java:42)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:333)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:368)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:567)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:549)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:863)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:549)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$1(RenderTask.java:680)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
我已经阅读了mosby PresenterManager，但仍然不知道为什么。另外，安装到手机，显示的布局还可以。
答案 0 :(得分：0)
更新： 这已在Mosby 3.0.1中修复。
这只是Mosby的android工具问题。
android布局编辑器实际上实例化MvpConstraintLayout的实例以在Android Studio中预览它。但是，Android Studio并没有通过将MvpContraintLayout之类的视图附加到真实的Activity，而是在内部使用一些模拟的＆＃34; context＆＃34;相似的事情。 Mosby的PresenterManager在内部尝试为您的MvpConstraintLayout查找活动，但在Android Studio中没有使用真正的活动（如前所述），因此UI编辑器显示此错误消息并在手机上安装时它工作正常（因为有一个真正的活动使用）。
要解决此问题，您必须在调用委托之前使用view.isInEditMode()：
public abstract class MvpConstraintLayout<V extends MvpView, P extends MvpPresenter<V>>
extends ConstraintLayout implements MvpView, ViewGroupDelegateCallback<V, P> {
...
@Override protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (!isInEditMode()) getMvpDelegate().onAttachedToWindow();
}
@Override protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (!isInEditMode()) getMvpDelegate().onDetachedFromWindow();
}
@SuppressLint("MissingSuperCall") @Override protected Parcelable onSaveInstanceState() {
if (!isInEditMode()) return getMvpDelegate().onSaveInstanceState();
return super.onSaveInstanceState();
}
@SuppressLint("MissingSuperCall") @Override
protected void onRestoreInstanceState(Parcelable state) {
if (!isInEditMode()) getMvpDelegate().onRestoreInstanceState(state);
}
/**
* Instantiate a presenter instance
*
* @return The {@link MvpPresenter} for this view
*/
public abstract P createPresenter();
@Override public P getPresenter() {
return presenter;
}
@Override public void setPresenter(P presenter) {
this.presenter = presenter;
}
@Override public V getMvpView() {
return (V) this;
}
@Override public final Parcelable superOnSaveInstanceState() {
return super.onSaveInstanceState();
}
@Override public final void superOnRestoreInstanceState(Parcelable state) {
super.onRestoreInstanceState(state);
}
}
这实际上是ViewGroupMvpDelegate应该在内部处理的事情。这应该用Mosby 3.0.1修复。