Question

对viewpager自定义适配器的destroyItem调用将转到unbinder.unbind（）（使用ButterKnife）。如果滚动速度慢，它可以正常工作，不可见的视图正如预期的那样被破坏。但是如果快速滚动，它会崩溃以下（发现一些关于相同错误的答案，但无法从中得到任何东西，因为条件不同。例如我使用的不是碎片）

06-14 17:48:54.037 13718-13718/com.areaseys.seysconecta.debug E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.areaseys.seysconecta.debug, PID: 13718
java.lang.IllegalStateException: Bindings already cleared.
    at com.areaseys.seysconecta.biwidgets.cloud.accesscontrol.AccessControlWidgetView_ViewBinding.unbind(AccessControlWidgetView_ViewBinding.java:32)
    at com.areaseys.seysconecta.mvp.view.BaseMVPViewView.onDetachedFromWindow(BaseMVPViewView.java:38)
    at com.areaseys.seysconecta.biwidgets.asbtractwidget.AbstractWidgetView.onDetachedFromWindow(AbstractWidgetView.java:69)
    at com.areaseys.seysconecta.mvp.view.BaseMVPViewPresenter.onDetachedFromWindow(BaseMVPViewPresenter.java:35)
    at com.areaseys.seysconecta.mvp.view.BaseMVPView.onDetachedFromWindow(BaseMVPView.java:50)
    at android.view.View.dispatchDetachedFromWindow(View.java:14519)
    at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:3133)
    at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4497)
    at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4470)
    at android.view.ViewGroup.removeView(ViewGroup.java:4402)
    at android.support.v4.view.ViewPager.removeView(ViewPager.java:1499)
    at com.areaseys.seysconecta.biwidgets.cloud.accesscontrol.AccessControlPagerAdapter.destroyItem(AccessControlPagerAdapter.java:35)
    at android.support.v4.view.ViewPager.populate(ViewPager.java:1170)
    at android.support.v4.view.ViewPager.populate(ViewPager.java:1084)
    at android.support.v4.view.ViewPager$3.run(ViewPager.java:267)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
    at android.view.Choreographer.doCallbacks(Choreographer.java:590)
    at android.view.Choreographer.doFrame(Choreographer.java:559)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:145)
    at android.app.ActivityThread.main(ActivityThread.java:5951)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)

适配器：

public class AccessControlPagerAdapter extends PagerAdapter {

private ArrayList<AccessControlWidget> widgets;

public AccessControlPagerAdapter(ArrayList<AccessControlWidget> widgets) {

    this.widgets = widgets;
}

@Override
public Object instantiateItem(ViewGroup collection, int position) {

    collection.addView(widgets.get(position));
    return widgets.get(position);
}

@Override
public int getCount() {
    return widgets.size();
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    container.removeView((View)object);
}

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == object;
}

}

和ViewPager中包含的对象的基类：

public abstract class BaseMVPViewView<BASEVIEW extends BaseMVPView, ACTIONS extends ViewActions> {

protected final BASEVIEW baseview;
protected ACTIONS actions;
private Unbinder unbinder;

public BaseMVPViewView(BASEVIEW baseview) {
    this.baseview = baseview;
    actions = getDefaultActions();
}

protected abstract ACTIONS getDefaultActions();

public void bind() {
    unbinder = ButterKnife.bind(this, baseview);
}

public void onAttachedToWindow() {
}

public void onDetachedFromWindow() {
    unbinder.unbind();
}

public void onInit() {

}

public void setActions(@NonNull ACTIONS actions) {
    this.actions = actions;
}

public void showError() {
    Toast.makeText(baseview.getContext(), R.string.error_ocurred, Toast.LENGTH_LONG).show();
}

}

Answer 1

阅读完之后，找到了这个thread讨论问题的地方。我有想法捕获异常，看看会发生什么，我想现在有些听众仍然挂在内存中，没有清除。我的viewpager只使用4个视图，所以危险似乎很小，应用程序不再崩溃：

public void onDetachedFromWindow() {
    try {
        unbinder.unbind();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    }
}

Android IllegalStateException：绑定已经清除

1 个答案: