小编Ufk*_*oku的帖子

有什么办法可以替换mergeGitHub rebasePR 吗？我查看了受保护的分支设置，但没有找到这样的选项。

我的AS版本是1.4稳定的香奈儿.当我进入主题编辑器时,我有一个空的预览屏幕.

在1.5.1上仍然存在同样的问题,从事件日志中获取了堆栈:

java.lang.NullPointerException
at com.android.tools.idea.configurations.ConfigurationMenuAction$PreviewAction.actionPerformed(ConfigurationMenuAction.java:269)
at com.intellij.ui.popup.PopupFactoryImpl$ActionPopupStep$1.run(PopupFactoryImpl.java:746)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:734)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:569)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:382)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

如何使用Robolectric测试AndroidX片段？

我添加了testImplementation "org.robolectric:shadows-supportv4:4.0-alpha-3"依赖项并尝试使用此代码:

val controller = SupportFragmentController.setupFragment(
            TestableFragment.buildFragment(DATA),
            TestableFragmentHolderActivity::class.java)

TestableFragment是的androidx.fragment.app.Fragment,TestableFragmentHolderActivity是的androidx.appcompat.app.AppCompatActivity

但是我在测试期间遇到错误:

java.lang.NoSuchMethodError:org.robolectric.shadows.support.v4.SupportFragmentController.setupFragment(Landroidx/fragment/app/Fragment; Ljava/lang/Class;)Landroidx/fragment/app/Fragment;

我上课了

class ThreadComment(
    banned: Int,
    closed: Int,
    comment: String?,
    date: String?,
    email: String?,
    files: ArrayList<File>?,
    lasthit: Int,
    name: String?,
    num: String?,
    op: Int,
    parent: String?,
    postsCount: Int,
    sticky: Int,
    subject: String?,
    tags: String?,
    timestamp: Int,
    trip: String?) : Comment(banned, closed, comment, date, email, files, lasthit, name, num, op, parent, postsCount, sticky, subject, tags, timestamp, trip) {

val answers: ArrayList<String> = ArrayList()}

父类看起来像

open class Comment(
    @com.google.gson.annotations.SerializedName("banned")
    val banned: Int = 0,

    @com.google.gson.annotations.SerializedName("closed")
    val closed: Int = 0,

    @com.google.gson.annotations.SerializedName("comment")
    val comment: …

OnDragListener:

@Override
public boolean onDrag(View v, DragEvent event) {
    switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_ENTERED:
            switch (v.getId()) {
                case R.id.delete_zone: {
                    addToShowCaseZone.setImageDrawable(getResources().getDrawable(R.drawable.showcase_2));
                    inAddToShowcasesZone = true;
                    break;
                }
                case MagazineGridAdapter.ID: {
                    enteredView = v;
                    break;
                }
            }
            return false;

        case DragEvent.ACTION_DRAG_EXITED: {
            switch (v.getId()) {
                case R.id.delete_zone: {
                    addToShowCaseZone.setImageDrawable(getResources().getDrawable(R.drawable.showcase_1));

                    inAddToShowcasesZone = false;
                    break;
                }
                case MagazineGridAdapter.ID: {
                    enteredView = null;
                    break;
                }
            }
            return true;
        }
        case DragEvent.ACTION_DRAG_STARTED:
            return true;

        case DragEvent.ACTION_DRAG_LOCATION:
            return false;

        case DragEvent.ACTION_DROP: {
            if (inAddToShowcasesZone) {
                final int …

如果定义全局属性,private var raceLoadJob: Job? = null那么Kotlin将要求您在方法中执行类似的操作

if (raceLoadJob != null){
    if (raceLoadJob!!.isActive) return // null assertation
}

Kotlin会要求断言,因为raceLoadJob值可以更改.我想到的第一件事是多线程.

所以你可以改变代码

raceLoadJob?.let {
    if (it.isActive) return
}

但是,如果您反编译这部分代码,您将会看到

Job var10000 = this.raceLoadJob;
if (this.raceLoadJob != null) {
   Job var1 = var10000;
   if (var1.isActive()) {
      return;
   }
}

你可以看到,这种情况是this.raceLoadJob != null,但不是var10000 != null.这意味着理论上这个代码可能因为raceLoadJob赋值而失败,但var10000是null.

这是一个问题,还是我的推理错误？