我有一个CardViews的RecyclerView列表。我点击一个CardView,它使用一个意图来启动一个新活动,向用户显示一个详细的CardView。我想在新的CardView上添加一个LongClick,它将启动一个Dialog来询问用户是否要删除CardView。我尝试了下面的设置。对话框没有启动,我也没有看到Toast。我在这里缺少什么?
public class CardViewDetails extends AppCompatActivity {
int position;
CardView cardView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details);
CardView cardView = (CardView) findViewById(detsinglecard_view);
cardView.setOnClickListener((View.OnClickListener) this);
cardView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
Toast.makeText(CardViewDetails.this,"Dialog Test",Toast.LENGTH_SHORT).show();
android.app.FragmentManager fm = getFragmentManager();
DeleteCardViewFragment delCardViewDialog = new DeleteCardViewFragment();
delCardViewDialog.show(fm,"delcardview dialog");
return true;
}
});
activity_details:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="#FFFFFF"
tools:context="com.wimso.v060B.CardViewDetails">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" >
</include>
<RelativeLayout
android:id="@+id/cardViewDetails"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background4main"
android:layout_marginTop="6dp"
android:layout_marginStart="6dp"
android:layout_marginLeft="6dp"
android:layout_marginEnd="6dp"
android:layout_marginRight="6dp" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="6dp"
android:layout_marginBottom="2dp"
android:textStyle="bold"
android:textColor="@color/colorFlLabelFinal"
android:textAppearance="?android:attr/textAppearanceLarge"
android:clickable="false"
android:layout_centerHorizontal="true" />
<Spinner
android:id="@+id/skycard_filter2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/Base.Widget.AppCompat.Spinner" />
**strong text**<android.support.v7.widget.CardView**strong text**
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
**strong text**android:id="@+id/detsinglecard_view"**strong text**
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
card_view:cardBackgroundColor="@android:color/white"
card_view:cardCornerRadius="6dp"
card_view:cardElevation="4dp"
android:longClickable="true" >
...
答案 0 :(得分:2)
在通过var science = new Class();
science.Name = "Sci-101";
science.Students.Add(new Student { Name = "Tom" });
science.Students.Add(new Student { Name = "Jerry" });
using (var dbCtx = new SchoolDBEntities())
{
// Add the class
dbCtx.Classes.Add(science);
// Save whole entity graph to the database.
// You do not need to save the students separately since they are part
// of the class. We have already added them to the class so saving the
// class will save the students added to the class as well.
dbCtx.SaveChanges();
}
setContentView()
中致电onCreate()
findViewById()