[英]Cannot Resolve symbol 'binding' error
所以我最近開始使用綁定,並在gradle中啟用了綁定,但是當我嘗試使用它時出現錯誤? 我同步了gradle和項目,一切都很好,但是當我嘗試使用綁定時,出現了“無法解析符號'綁定'”錯誤。 請幫助! 這是我的xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.mike.myapplication.adminScreen"
tools:showIn="@layout/activity_admin_screen">
<EditText
android:id="@+id/nameEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
tools:layout_constraintTop_creator="1"
android:layout_marginStart="37dp"
android:layout_marginTop="31dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/timeToPrepEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
android:text="Time To Prepare"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="@+id/nameEditText"
android:layout_marginTop="20dp"
app:layout_constraintTop_toBottomOf="@+id/nameEditText"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/nameEditText" />
<EditText
android:id="@+id/descEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
android:text="Description"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="@+id/timeToPrepEditText"
android:layout_marginTop="7dp"
app:layout_constraintTop_toBottomOf="@+id/timeToPrepEditText"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/timeToPrepEditText" />
<EditText
android:id="@+id/priceEditText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
android:text="Price"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="@+id/descEditText"
android:layout_marginTop="10dp"
app:layout_constraintTop_toBottomOf="@+id/descEditText"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/descEditText" />
<Button
android:id="@+id/addButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add Item"
android:onClick="addButtonClicked"
tools:layout_constraintTop_creator="1"
android:layout_marginTop="24dp"
app:layout_constraintTop_toBottomOf="@+id/priceEditText"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/priceEditText" />
<Button
android:id="@+id/deleteButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Delete Item"
android:onClick="deleteButtonClicked"
tools:layout_constraintTop_creator="1"
android:layout_marginTop="15dp"
app:layout_constraintTop_toBottomOf="@+id/addButton"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/addButton" />
<Button
android:id="@+id/databaseButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Display Database"
android:onClick="dispDatabaseButton"
tools:layout_constraintTop_creator="1"
android:layout_marginTop="-79dp"
app:layout_constraintTop_toBottomOf="@+id/addButton"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/addButton"
android:layout_marginLeft="156dp" />
<TextView
android:id="@+id/myText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="-41dp"
android:layout_marginStart="15dp"
android:layout_marginTop="54dp"
android:onClick="dispDatabaseButton"
android:text="Results"
android:textSize="30sp"
android:textStyle="bold"
app:layout_constraintLeft_toRightOf="@+id/deleteButton"
app:layout_constraintTop_toBottomOf="@+id/deleteButton"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintTop_creator="1" />
如何解決我的錯誤?
另外,這里是活動的代碼,在我看來,這不是默認的主要活動,而是AdminScreen。
public class adminScreen extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin_screen);
}
private void saveToDB() {
SQLiteDatabase database = new DBSQLiteHelper(this).getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Menu.MenuItems.COLUMN_NAME, binding.nameEditText.getText().toString());
values.put(Menu.MenuItems.COLUMN_PREP, binding.timeToPrepEditText.getText().toString());
values.put(Menu.MenuItems.COLUMN_DESCRIPTION, binding.descEditText.getText().toString());
values.put(Menu.MenuItems.COLUMN_PRICE, binding.priceEditText.getText().toString());
long newRowId = database.insert(Menu.MenuItems.TABLE_NAME, null, values);
Toast.makeText(this, "The new Row Id is " + newRowId, Toast.LENGTH_LONG).show();
}
}
如果您的意思是DataBinding庫,則應該以這種方式構建布局
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable name="user" type="com.example.User"/>
</data>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{user.firstName}"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{user.lastName}"/>
</LinearLayout>
</layout>
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