简书链接:今天遇到的2个最令人匪夷所思的问题解决办法
文章字数：502,阅读全文大约需要2分钟

第一个问题

clasdef 4.4 明明多个dex都设置正常，包括依赖引用 multiDexEnabled true
implementation 'com.android.support:multidex:1.0.1'
并在appcontext里面加上

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protected void attachBaseContext(Context base) {
    super.attachBaseContext(base);
 MultiDex.install(this);
}

并且

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<application
       android:name=".AppContext"

依然没有错误，太让我怀疑人生了，于是我打包看了看就一个dex,好吧，我全部删掉，关闭 多个dex好了，ok完美，这个问题是逃避的解决方法，因为其它重新编译的方法都尝试过了。

第二个问题

横屏切换 测试内存不足界面被销毁回来之后崩溃，调用onRestoreInstanceState 和onRestoreInstanceState`
结果打死都不调用onRestoreInstanceState 只调用前者,这个问题就算了，不管了，那么内存不足引发的崩溃问题复现了,

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at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2687)
                                                             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2785) 
                                                             at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4603) 
                                                             at android.app.ActivityThread.-wrap19(ActivityThread.java) 
                                                             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1540) 
                                                             at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                             at android.os.Looper.loop(Looper.java:163) 
                                                             at android.app.ActivityThread.main(ActivityThread.java:6342) 
                                                             at java.lang.reflect.Method.invoke(Native Method) 
                                                             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:880) 
                                                             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:770) 
                                                             at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:107) 
                                                         java.lang.IllegalArgumentException: No view found for id 0x7f09009f (cn.qssq666.robot:id/fragment_space_x) for fragment Tab1PosterMenuContainFragment{df83d73 #10 id=0x7f09009f}

网上的方法无非就是使用getChildFragmenManager，我使用childFragmentManager 页面是空白的，我头脑发胀，反复的 调试parent fragment的替换方式为getChildManager或者fragmetn的 fragmentManager或者getActivity().getSuppoertFragmentManager()都不能解决问题,到底应该怎么做，
在我写这篇文章的时候我突然焕然大悟，空白是不是因为 fragment被窝做了某些懒加载等导致的。

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final ArrayList<Class<? extends Fragment>> listFragment = new ArrayList();
              listFragment.add(Tab1PosterMenuContainFragment.class);
              listFragment.add(Tab1PosterMenuContainInvitationFragment.class);
              Class<? extends Fragment> fragmentClass = listFragment.get(index);
              try{
  FragmentUtil.replaceFragment(getActivity(), fragmentClass, R.id.fragment_space_x, false);//todo 空白问题没法解决了。 但是onSaveInstanceState  No view found for id for...

              }catch (IllegalArgumentException e){
                  final ArrayList<BaseLazyLoadFragment> list = new ArrayList();
                  list.add(new Tab1PosterMenuContainFragment());
                  list.add(new Tab1PosterMenuContainInvitationFragment());
                  list.add(new Tab1PosterMenuContainVideoFragment());

                  BaseLazyLoadFragment fragment = list.get(index);
                  fragment.setLazyLoadMode(false);
                  FragmentUtil.replaceChildFragment(PosterFragment.this,getActivity(), fragment,R.id.fragment_space_x,false);

              }

那么我就这样写，或者直接使用catch里面的代码应该就可以了。

由于fragment一个嵌套一个嵌套了很多个了，
那么问题太多了。

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java.lang.IllegalStateException: Fragment has not been attached yet.
                                                                 at android.support.v4.app.Fragment.instantiateChildFragmentManager(Fragment.java:2308)

包括vivewpager里面使用getFragmentManger导致滑动不流畅之类的。
改良之后的fragment替换代码

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 public static <T> void replaceFragment(final Fragment parentFragment, final FragmentActivity activity, final Fragment fragment, final Bundle bundle,
                                           final int containerId, final String tag, final String backStackName,
                                           final boolean addToBackStack, final boolean needAnim) {
        Bundle tempBundle = bundle;
        if (tempBundle != null) {
            fragment.setArguments(tempBundle);
        }
        FragmentManager supportFragmentManager;
        if (parentFragment != null) {
            if (!parentFragment.isAdded()) {
                Log.e(TAG, "fragment not added");
                return;
            }
            if (parentFragment.getActivity() == null) {
                Log.e(TAG, "  java.lang.IllegalStateException: Fragment has not been attached yet.");//继续调用也没用 还是会崩溃
                return;
            }
            supportFragmentManager = parentFragment.getChildFragmentManager();
        } else {
            supportFragmentManager = activity.getSupportFragmentManager();
            if (fragment instanceof FragmentOnStartNeedCheckVisible) {
                ((FragmentOnStartNeedCheckVisible) fragment).setOnStartNeedCheckData(true);
            }
        }
        if (fragment != null && supportFragmentManager != null) {
            FragmentTransaction transaction = supportFragmentManager.beginTransaction();
            if (needAnim) {

                transaction.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right);
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
                if (activity == null || activity.isDestroyed()) {
                    Log.e(TAG, "activity is destory! " + Log.getStackTraceString(new Throwable()));
                    return;
                }
            }
//                        transaction.setCustomAnimations(R.animator.fragment_enter_left, R.animator.fragment_exit_left);
            Log.i(TAG, "containerId:" + (containerId == CONTAINER_ID_DEFAULT ? R.id.fragment_space : containerId) + "");
            transaction.replace(containerId == CONTAINER_ID_DEFAULT ? R.id.fragment_space : containerId, fragment, tag);
            if (addToBackStack) {
                transaction.addToBackStack(backStackName);
            }
            transaction.commitAllowingStateLoss();
                        /*
                            Can not perform this action after onSaveInstanceState
                      java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
                          at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1493)
                          at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1511)
                          at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:634)
                          at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:613)
                         */
        } else {
            Log.e(TAG, "fragmentManager is Empty! " + Log.getStackTraceString(new Throwable()));
        }
//            }
//        }, 50);
    }