Fragment XXXXXX{xxxxxxxxx} not attached to Activity
2017-12-15 16:14
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Monkey跑出如下异常。导致Settings Crash
这个异常是这里抛出来的:
那么就说明mHost为null。mHost为什么是Null呢,什么情况下不是Null呢?
这里的说明意思是Fragment需要Attach的Activity,如果mHost为空,那么就是Fragment还没attach到Activity呗。
避免如下问题可以通过先判断mHost是否,当然系统已经给你写好了,你直接调用就ok了。
E AndroidRuntime: at android.app.Fragment.getResources(Fragment.java:814) E AndroidRuntime: at android.app.Fragment.getText(Fragment.java:826) E AndroidRuntime: at com.android.settings.wifi.WifiSettings.setOffMessage(WifiSettings.java:767) E AndroidRuntime: at com.android.settings.wifi.WifiSettings.onWifiStateChanged(WifiSettings.java:825) E AndroidRuntime: at com.android.settingslib.wifi.WifiTracker$MainHandler.handleMessage(WifiTracker.java:581)
这个异常是这里抛出来的:
frameworks/base/core/java/android/app/Fragment.java 809 /** 810 * Return <code>getActivity().getResources()</code>. 811 */ 812 final public Resources getResources() { 813 if (mHost == null) { 814 throw new IllegalStateException("Fragment " + this + " not attached to Activity"); 815 } 816 return mHost.getContext().getResources(); 817 } 818
那么就说明mHost为null。mHost为什么是Null呢,什么情况下不是Null呢?
432 // Activity this fragment is attached to. 433 FragmentHostCallback mHost;
这里的说明意思是Fragment需要Attach的Activity,如果mHost为空,那么就是Fragment还没attach到Activity呗。
避免如下问题可以通过先判断mHost是否,当然系统已经给你写好了,你直接调用就ok了。
894 /** 895 * Return true if the fragment is currently added to its activity. 896 */ 897 final public boolean isAdded() { 898 return mHost != null && mAdded; 899 }
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