【Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference】的更多相关文章

Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on a null object reference

E/AndroidRuntime﹕ FATAL EXCEPTION: mainProcess: org.example.magnusluca.drawertestapp, PID: 3624java.lang.NullPointerException: Attempt to write to field 'android.support.v4.app.FragmentManagerImpl android.support.v4.app.Fragment.mFragmentManager' on…

Caused by: java.lang.NullPointerException: Attempt to write to field 'int android.app.Fragment.mNextAnim' on a null object reference

原因fragment必须先add(),才能remove(),故remove前先做判空操作 参考:http://www.cnblogs.com/hixin/p/4427276.html…

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference

/********************************************************************************* * Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object referenc…

android.widget.TextView.setText() on a null object reference

错误描述 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 问题分析 照成错误的原因是那个 TextView ,并不是传进去的那个值的问题.确保你在 setText() 的时候,已经初使化了你的 TextView…

java.lang.NullPointerException: Attempt to invoke virtual method 'int com.example.xxx.Json.NewsBean.getError_code()' on a null object reference错误解决

AS在运行的过程中出现了错误: java.lang.NullPointerException: Attempt to invoke virtual method 'int com.example.xxx.Json.NewsBean.getError_code()' on a null object reference AS会报异常:异常:No Network Security Config specified, using platform default.是高版本联网失败的问题 解决办法:在清…

java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.yunweather.app.db.YunWeatherDB.loadProvinces()' on a null object reference

NullPointerException:查看自己的什么地方是否对空指针进行了操作 Attempt to invoke virtual method 'java.util.List com.yunweather.app.db.YunWeatherDB.loadProvinces()' on a null object reference 尝试用一个空对象引用调用LoadProvinces()方法,查看调用LoadProvinces()的对象是否初始化,很可能是因为你没有初始化就调用了LoadPr…

java.lang.NullPointerException: Attempt to invoke virtual method 'void 、Handler.removeMessages(int)' on a null object reference

onDestory进行释放Handler时,需要判断null if(null != mHandler) {             mHandler.removeMessages(MSG_CHANGE_TEXT_COLOR);             mHandler.removeMessages(MSG_JUMP_TO_SUCCESS_PAGE);             mHandler.removeMessages(MSG_PLAY_LITTLE_PEOPLE_ANIMATION);  …

Attempt to invoke interface method 'boolean java.util.List.add(java.lang.Object)' on a null object reference

尝试在一个空的对象引用上引用boolean java.util.List.add()这个方法: 错误例子: private ArrayList<String> classList; classList.add("2014211501"); 相当于classList为null.   正确实例: private ArrayList<String> classList=new ArrayList<String>(); classList.add("…

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.catherine.forrealm.about_utils.RealmHelper.findAllStudent()' on a null object reference

报错: 解决方法: private RealmHelper realm_search = new RealmHelper(); 进而发现在写RecyclerView时,遗漏如下代码: recy_search.setHasFixedSize(true); recy_search.setNestedScrollingEnabled(true); recy_search.setLayoutManager(new GridLayoutManager(SearchActivity.this,1)); 将其…

Android fragment切换后onresume时报 Attempt to write to field 'int android.support.v4.app.Fragment.mNextAnim'

动态加载fragment以后,调用了remove方法移除Fragment,在返回来的时候报 Attempt to write to field 'int android.support.v4.app.Fragment.mNextAnim' 空指针 这是因为,在Fragment为null的时候就调用的remove,解决办法是remove的时候返回是否Fragment为null,为null就不用执行remove方法 It's because you are calling remove() add(…