我收到上面显示的错误，我已经检查了，但是在我的代码中没有引用ListView。我以前使用过ListView，但将其更改为RecycleView，但出现此错误。
这是我的restaurantAdapter类。
public class restaurantAdapter extends
RecyclerView.Adapter<restaurantAdapter.viewHolder> {
private List<restaurant> restau;
public restaurantAdapter(List<restaurant> res) {
this.restau = res;
}
@NonNull
@Override
public restaurantAdapter.viewHolder onCreateViewHolder(@NonNull ViewGroup
viewGroup, int i) {
View view =
LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.restaurant_view
,viewGroup, false);
return new viewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull restaurantAdapter.viewHolder
viewAdapter, int i) {
restaurant pos = restau.get(i);
viewAdapter.imageView.setImageResource(pos.getmImage());
viewAdapter.textView.setText(pos.getmName());
viewAdapter.textView1.setText(pos.getmCusine());
viewAdapter.textView2.setText(pos.getmOffers());
}
@Override
public int getItemCount() {
return restau.size();
}
public class viewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
TextView textView;
TextView textView1;
TextView textView2;
public viewHolder(@NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.restaurant_imageView);
textView = itemView.findViewById(R.id.name_textView);
textView1 = itemView.findViewById(R.id.cuisine_textView);
textView2 = itemView.findViewById(R.id.offer_textView);
}
}
这是我的MainActivity.xml，我的restaurant_view.xml文件中有一个LinearLayout。
<android.support.v4.widget.NestedScrollView
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">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/offersRecycleView"
android:layout_width="match_parent"
android:layout_height="210dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</android.support.v7.widget.RecyclerView>
<android.support.v7.widget.RecyclerView
android:id="@+id/pickFavoriteRecycleView"
android:layout_width="match_parent"
android:layout_height="73dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/offersRecycleView" />
<android.support.v7.widget.RecyclerView
android:id="@+id/restaurantItem"
android:layout_width="match_parent"
android:layout_height="738dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:orientation="vertical"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/pickFavoriteRecycleView"
/>
</android.support.constraint.ConstraintLayout>
</android.support.v4.widget.NestedScrollView>
这是MainActivity的完整代码
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Setting Header Recycle View
ArrayList<offers> word = new ArrayList<>();
word.add(new offers(R.drawable.offer_one, "Subscribe"));
word.add(new offers(R.drawable.swiggy_coupons, "offers"));
word.add(new offers(R.drawable.swiggy_offers7, "Subscribe"));
word.add(new offers(R.drawable.swiggy_offer_3, "offers"));
word.add(new offers(R.drawable.swiggy_paytm_offers_3, "offers"));
word.add(new offers(R.drawable.swiggy_offer2, "offers"));
offersAdapter adapter = new offersAdapter(word);
RecyclerView recyclerView = findViewById(R.id.offersRecycleView);
LinearLayoutManager layoutManager = new LinearLayoutManager(this,
LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
//Setting chooseBest recycle View
ArrayList<chooseBest> choose = new ArrayList<>();
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT is
Text\nsome text"));
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT is
Text\nsome text"));
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT Text some
text"));
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT some
text"));
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT is
Text\nsome text"));
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT is
Text\nsome text"));
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT Text some
text"));
choose.add(new chooseBest(R.drawable.ic_bike_black_24dp, "IT some
text"));
chooseBestAdapter adapter1 = new chooseBestAdapter(choose);
RecyclerView recyclerView1 = findViewById(R.id.pickFavoriteRecycleView);
LinearLayoutManager layoutManager1 = new LinearLayoutManager(this,
LinearLayoutManager.HORIZONTAL, false);
recyclerView1.setLayoutManager(layoutManager1);
recyclerView1.setAdapter(adapter1);
//Setting the Restaurant information View
ArrayList<restaurant> restau = new ArrayList<>();
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restau.add(new restaurant(R.mipmap.ic_launcher_round,"Amar
Punjabi","North Indian","5% off on All"));
restaurantAdapter restaurantAdapter = new restaurantAdapter(restau);
RecyclerView recyclerView2 = findViewById(R.id.restaurantItem);
LinearLayoutManager layoutManager2 = new
LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
recyclerView2.setLayoutManager(layoutManager2);
recyclerView2.setAdapter(restaurantAdapter);
}
}
这是错误。
04-01 00:35:58.069 12248-12248/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.shoaib.swiggymock, PID: 12248
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.shoaib.swiggymock/com.example.shoaib.swiggymock.MainActivity}: java.lang.ClassCastException: android.support.v7.widget.RecyclerView cannot be cast to android.widget.ListView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2426)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: java.lang.ClassCastException: android.support.v7.widget.RecyclerView cannot be cast to android.widget.ListView
at com.example.shoaib.swiggymock.MainActivity.onCreate(MainActivity.java:80)
at android.app.Activity.performCreate(Activity.java:6259)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2490)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1354)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
答案 0 :(得分：0)
对我有用的是我清理项目，然后重建它，然后重新启动PC，不知道它为什么起作用，但是它起作用了。