Android Data Binding fa crash dell'applicazione quando si utilizza tag include in un ViewGroup non root

Question

Quando uso il tag include in un elemento non root nel file xml con Associazione dati Android, l'arresto anomalo dell'app. Ma l'app funziona bene quando il tag include viene inserito nell'elemento principale o senza elementi di associazione dati.

Ecco il mio codice sorgente, qualcuno può aiutarmi a capire il motivo?

activity_main.xml

<layout> 

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical" 
     tools:context=".MainActivity"> 


     <TextView 
      android:id="@+id/text_view" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="@string/hello_world" /> 

     <LinearLayout 

      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

      <include layout="@layout/include_layout" /> 

     </LinearLayout> 
    </LinearLayout> 
</layout> 

---

MainActivity.java

public class MainActivity extends AppCompatActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main); 
     binding.textView.setText("hello world"); 
    } 
} 

dello stack trace

I/ActivityManager(13254): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.liangfeizc.databindings/.MainActivity (has extras)} from uid 10008 on display 0 
I/ActivityManager(13254): Start proc com.liangfeizc.databindings for activity com.liangfeizc.databindings/.MainActivity: pid=18181 uid=10065 gids={50065, 9997} abi=x86 
I/art  (18181): Not late-enabling -Xcheck:jni (already on) 
D/AndroidRuntime(18181): Shutting down VM 
E/AndroidRuntime(18181): FATAL EXCEPTION: main 
E/AndroidRuntime(18181): Process: com.liangfeizc.databindings, PID: 18181 
E/AndroidRuntime(18181): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.liangfeizc.databindings/com.liangfeizc.databindings.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.setTag(java.lang.Object)' on a null object reference 
E/AndroidRuntime(18181): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) 
E/AndroidRuntime(18181): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) 
E/AndroidRuntime(18181): at android.app.ActivityThread.access$800(ActivityThread.java:144) 
E/AndroidRuntime(18181): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) 
E/AndroidRuntime(18181): at android.os.Handler.dispatchMessage(Handler.java:102) 
E/AndroidRuntime(18181): at android.os.Looper.loop(Looper.java:135) 
E/AndroidRuntime(18181): at android.app.ActivityThread.main(ActivityThread.java:5221) 
E/AndroidRuntime(18181): at java.lang.reflect.Method.invoke(Native Method) 
E/AndroidRuntime(18181): at java.lang.reflect.Method.invoke(Method.java:372) 
E/AndroidRuntime(18181): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) 
E/AndroidRuntime(18181): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 
E/AndroidRuntime(18181): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.setTag(java.lang.Object)' on a null object reference 
E/AndroidRuntime(18181): at com.liangfeizc.databindings.databinding.ActivityMainBinding.<init>(ActivityMainBinding.java:27) 
E/AndroidRuntime(18181): at com.liangfeizc.databindings.databinding.ActivityMainBinding.bind(ActivityMainBinding.java:88) 
E/AndroidRuntime(18181): at android.databinding.DataBinderMapper.getDataBinder(DataBinderMapper.java:14) 
E/AndroidRuntime(18181): at android.databinding.DataBindingUtil.bind(DataBindingUtil.java:107) 
E/AndroidRuntime(18181): at android.databinding.DataBindingUtil.inflate(DataBindingUtil.java:68) 
E/AndroidRuntime(18181): at android.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:185) 
E/AndroidRuntime(18181): at com.liangfeizc.databindings.MainActivity.onCreate(MainActivity.java:18) 
E/AndroidRuntime(18181): at android.app.Activity.performCreate(Activity.java:5937) 
E/AndroidRuntime(18181): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) 
E/AndroidRuntime(18181): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251) 
E/AndroidRuntime(18181): ... 10 more 
W/ActivityManager(13254): Force finishing activity com.liangfeizc.databindings/.MainActivity 
D/  (13254): HostConnection::get() New Host Connection established 0xa0a234d0, tid 13352 

Answer 1

qui riportato: https://code.google.com/p/android/issues/detail?id=176649

fisso internamente, dovrebbe essere rilasciato presto.

Answer 2

Ho riscontrato problemi con il tag include prima che non ci fosse un bug con il codice. Suggerisco di usare i frammenti invece sono affidabili e un modo migliore di programmare. Crea i tuoi file si includono in frammenti e quindi chiamare frammento nel file di layout come questo

<fragment android:name="your fragment here" 
      android:id="@+id/article_fragment" 
      android:layout_weight="2" 
      android:layout_width="0dp" 
      android:layout_height="match_parent" /> 

Suggerisco colpito Google per frammenti e si compila il resto.