2018-07-24 java.lang.IllegalStat

错误：

java.lang.IllegalStateException: Activity has been destroyed

    at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1555)

    at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:696)

    at android.support.v4.app.BackStackRecord.commitAllowingStateLoss(BackStackRecord.java:667)

    at com.bumptech.glide.manager.RequestManagerRetriever.getSupportRequestManagerFragment(RequestManagerRetriever.java:187)

    at com.bumptech.glide.manager.RequestManagerRetriever.supportFragmentGet(RequestManagerRetriever.java:195)

    at com.bumptech.glide.manager.RequestManagerRetriever.get(RequestManagerRetriever.java:104)

    at com.bumptech.glide.Glide.with(Glide.java:644)

    at com.meinong.activity.PickPhotoPreviewActivity.setRootView(PickPhotoPreviewActivity.java:51)

    at org.mn.frame.MNActivity.onCreate(MNActivity.java:141)

    at android.app.Activity.performCreate(Activity.java:6875)

    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)

    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)

    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)

    at android.app.ActivityThread.-wrap12(ActivityThread.java)

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1514)

    at android.os.Handler.dispatchMessage(Handler.java:102)

    at android.os.Looper.loop(Looper.java:163)

    at android.app.ActivityThread.main(ActivityThread.java:6221)

    at java.lang.reflect.Method.invoke(Method.java)

    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.meinong.test/com.meinong.activity.PickPhotoPreviewActivity}: java.lang.IllegalStateException: Activity has been destroyed

    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2706)

    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)

    at android.app.ActivityThread.-wrap12(ActivityThread.java)

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1514)

    at android.os.Handler.dispatchMessage(Handler.java:102)

    at android.os.Looper.loop(Looper.java:163)

    at android.app.ActivityThread.main(ActivityThread.java:6221)

    at java.lang.reflect.Method.invoke(Method.java)

    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)

网上所有跟这个错误有关的都是有fragment的activity但是我的act没有fragment，所以不知道原因出在哪

一步步看源码找到异常抛出的位置在android.support.v4.app.FragmentManagerImpl的enqueueAction（）方法：

public void enqueueAction(Runnable action,boolean allowStateLoss) {

if (!allowStateLoss) {

checkStateLoss();

}

synchronized (this) {

if (mDestroyed ||mHost ==null) {

throw new IllegalStateException("Activity has been destroyed");

}

if (mPendingActions ==null) {

mPendingActions =new ArrayList();

}

mPendingActions.add(action);

if (mPendingActions.size() ==1) {

mHost.getHandler().removeCallbacks(mExecCommit);

mHost.getHandler().post(mExecCommit);

}

}

}

mDestroyed等于true或者mHost ==null。

继续追查mHost的赋值只有一个地方，FragmentManagerImpl的attachController（）方法：

public void attachController(FragmentHostCallback host,

FragmentContainer container, Fragment parent) {

if (mHost !=null)throw new IllegalStateException("Already attached");

mHost = host;

mContainer = container;

mParent = parent;

}

mHost = host; --而attachController的调用在FragmentController的attachHost（）方法：

public void attachHost(Fragment parent) {

mHost.mFragmentManager.attachController(

mHost,mHost /*container*/, parent);

}

而    的调用在FragmentActivity（）的oncreate中 第一行。

但是我发现继承FragmentActivity的类调用Glide.with方法竟然在super.onCreate(savedInstanceState);之前。。。

显然Glide.with调用时mHost还没有赋值，所以抛了异常IllegalStateException。。。

继承的activity，super.onCreate(savedInstanceState)一定要最先调用，切记切记！！！！！