[英]App crashing when using android data-binding on android 8
The code work on pre-oreo devices, but Crashlytics saying it crashing on android 8 devices 该代码适用于pre-oreo设备,但Crashlytics称它在Android 8设备上崩溃
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getAppComponent().inject(this);
binding = DataBindingUtil.setContentView(this, R.layout.main_activity);
}
The stacktrace 堆栈跟踪
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.ViewGroup.getChildCount()' on a null object reference java.lang.NullPointerException:尝试在空对象引用上调用虚方法'int android.view.ViewGroup.getChildCount()'
Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.ViewGroup.getChildCount()' on a null object reference
at android.databinding.DataBindingUtil.bindToAddedViews(DataBindingUtil.java:295)
at android.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:279)
at android.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:261)
at com.myapp.MyActivity.onCreate(MyActivity.java:59)
at android.app.Activity.performCreate(Activity.java:7174)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6940)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Have similar crashes with exactly the same stacktrace on 8. 在8上具有完全相同的堆栈跟踪的类似崩溃。
Have you tried using: 你尝试过使用过:
binding = DataBindingUtil.inflate(getLayoutInflater(), R.layout.activity, null, false);
setContentView(binding.getRoot());
Difference between code above and calling 上面的代码和调用之间的区别
DataBindingUtil.setContentView(...);
is that inflate()
returns a View
directly which is later passed to DataBindingUtils::bindToAddedViews
. 是DataBindingUtils::bindToAddedViews
inflate()
直接返回一个View
,后来传递给DataBindingUtils::bindToAddedViews
。 In case of DataBindingUtil.setContentView
the following logic is being used 在DataBindingUtil.setContentView
的情况下,使用以下逻辑
activity.setContentView(layoutId);
View decorView = activity.getWindow().getDecorView();
ViewGroup contentView = (ViewGroup) decorView.findViewById(android.R.id.content);
and it seems that 而且似乎
ViewGroup contentView = (ViewGroup) decorView.findViewById(android.R.id.content);
is just NULL
... 只是NULL
...
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