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[英]Databinding : Failed to call observer method / Resources$NotFoundException
[英]LiveData(MutableLiveData) and Databinding rise error (Failed to call observer method)
我有一個應用程序,它使用 ViewModel 和 MutableLiveData 將實時數據綁定到我的 UI。 經過幾個小時的西邊我的時間! 並查看互聯網上的所有樣本我找不到問題的原因。
我的活動:
public class DetailActivity extends DaggerAppCompatActivity {
ActivityStudentBinding mViewDataBinding;
MyModel myModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mViewDataBinding = DataBindingUtil.setContentView(this, R.layout.activity_student);
mViewDataBinding.setLifecycleOwner(this);
myModel = ViewModelProviders.of(this).get(MyModel.class);
mViewDataBinding.setViewmodel(myModel);
}
我的模型類:
public class MyModel extends ViewModel
{
public MutableLiveData<StudentData.Student> student = new MutableLiveData<>();
public MyModel() {
this.student=student;
StudentData.Student student = new StudentData().getFirstStudent();
this.student.setValue(student);
}
}
和布局(我在這里清理了額外的代碼):
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data >
<variable
name="viewmodel"
type="googlearchitecturecomponents.ferdos.com.dagger211.detail.MyModel"/>
</data>
<TextView
android:text="@{viewmodel.student.id}" />
<TextView
android:text="@{viewmodel.student.family}" />
<TextView
android:text="@{viewmodel.student.id}"/>
</layout>
在運行時和創建活動時,我收到此錯誤:
java.lang.RuntimeException:無法啟動活動 ComponentInfo{googlearchitecturecomponents.ferdos.com.dagger211/googlearchitecturecomponents.ferdos.com.dagger211.detail.DetailActivity}:java.lang.RuntimeException:無法調用觀察者方法------ - - 堆棧跟蹤 - - - - -
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) android.app.ActivityThread.access$800(ActivityThread.java:144) android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) android.os.Handler.dispatchMessage(Handler.java:102) android.os.Looper.loop(Looper.java:135) android.app.ActivityThread.main(ActivityThread.java:5221) java.lang.reflect.Method.invoke(Native Method) java.lang.reflect.Method.invoke(Method.java:372) com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
請幫我解決這個令人困惑的錯誤!!
您必須使用字符串值來設置android:text
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{String.valueOf(viewmodel.student.id)}" />
或者你也可以簡單地這樣做
<TextView
android:text="@{viewmodel.student.id.toString}" />
<TextView
android:text="@{viewmodel.student.family.toString}" />
<TextView
android:text="@{viewmodel.student.id.toString}"/>
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