我正在尝试开发一个应用程序，其中必须在recylcerview按钮点击时打开alertdialog，这些是我得到的错误：
21 06:50:20.817 1037-1037/com.example.hephaestus.shadowpets4
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IllegalStateException: You need to use a Theme.AppCompat
theme (or descendant) with this activity.
at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:359)
at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:328)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)
at android.support.v7.app.AppCompatDialog.setContentView(AppCompatDialog.java:83)
at android.support.v7.app.AlertController.installContent(AlertController.java:225)
at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:257)
at android.app.Dialog.dispatchOnCreate(Dialog.java:351)
at android.app.Dialog.show(Dialog.java:256)
at com.example.hephaestus.shadowpets4.Adapters.TrainerAdapter$1.onClick(TrainerAdapter.java:84)
at android.view.View.performClick(View.java:4084)
at android.view.View$PerformClick.run(View.java:16966)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
经过大量研究后，我发现我的问题的答案是在你的活动中使用警告对话框，我们应该在创建警告对话框时使用活动而不是上下文，我们应该在使用片段时使用应用程序上下文，这些更改必须在适配器（因为我将它与recylcerview一起使用）以及它执行的活动，这个例子可以理解： 以下是使用片段
中的recyclerview实现警告对话框的示例 public class AdoptpetAdapter extends RecyclerView.Adapter<AdoptpetAdapter.ViewHolder> {
private Context context;
private List<Pet> petList;
public AdoptpetAdapter(Context context,List<Pet> petList)
{
this.context=context;
this.petList=petList;
}
@Override
public AdoptpetAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_pet,parent,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
holder.petName.setText(petList.get(position).getPetName());
holder.petCost.setText(petList.get(position).getPetCost());
Picasso.with(context).load(petList.get(position).getPetImage()).into(holder.imageView);
holder.btn_Contact.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LayoutInflater li =LayoutInflater.from(context);
View promptsView = li.inflate(R.layout.petenquiryform,null);
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setView(promptsView);
TextView msg_Title =(TextView)promptsView.findViewById(R.id.txt_petEnquirytitle);
msg_Title.setText("Enquiry about "+" "+petList.get(position).getPetName());
EditText txt_message =(EditText) promptsView.findViewById(R.id.txt_message);
builder.setCancelable(false)
.setPositiveButton("Send", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
});
}
@Override
public int getItemCount() {
return petList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder
{
private ImageView imageView;
private TextView petCost,petName;
private Button btn_Contact;
public ViewHolder(View itemView) {
super(itemView);
imageView=(ImageView)itemView.findViewById(R.id.img_pet);
petCost=(TextView)itemView.findViewById(R.id.txt_petprice);
petName=(TextView)itemView.findViewById(R.id.txt_petname);
btn_Contact=(Button)itemView.findViewById(R.id.btn_contactSeller);
}
}
}
要在片段中实现它，您只需执行以下代码
public class Pets extends Fragment {
List<Pet> petList;
RecyclerView recyclerView;
ProgressDialog pDialog;
AdoptpetAdapter adapter;
public Pets() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view= inflater.inflate(R.layout.fragment_pets, container, false);
return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerView=(RecyclerView)view.findViewById(R.id.list_pets);
initviews();
}
private void initviews()
{
pDialog = new ProgressDialog(getContext());
pDialog.setMessage("Loading,Please wait...");
pDialog.setCancelable(false);
pDialog.show();
try
{
Glide.with(this).load(R.drawable.ic_menu_gallery).into((ImageView) recyclerView.findViewById(R.id.img_pet));
}
catch (Exception ex)
{
}
petList=new ArrayList<>();
adapter=new AdoptpetAdapter(getContext(),petList);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(),2);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(adapter);
loadJson();
}
private void loadJson()
{
try
{
Retrofit retrofit = new Retrofit.Builder().baseUrl(APIUrl.BASE_URL).addConverterFactory(GsonConverterFactory.create()).build();
APIService service=retrofit.create(APIService.class);
Call<Response> call =service.getPetList();
call.enqueue(new Callback<Response>() {
@Override
public void onResponse(Call<Response> call, retrofit2.Response<Response> response) {
List<Pet>data=response.body().getPetList();
recyclerView.setAdapter(new AdoptpetAdapter(getActivity(),data));
recyclerView.smoothScrollToPosition(0);
pDialog.hide();
}
@Override
public void onFailure(Call<Response> call, Throwable t) {
pDialog.dismiss();
}
});
}
catch (Exception ex)
{
pDialog.hide();
}
}
}
**在Activity中实现它时，应该如下更改，以下是适配器的代码并在其中实现警告对话框**
public class TrainerAdapter extends RecyclerView.Adapter<TrainerAdapter.ViewHolder> {
private Activity activity;
private List<Trainer> trainerList;
public TrainerAdapter(Activity activity,List<Trainer> trainerList)
{
this.activity=activity;
this.trainerList=trainerList;
}
@Override
public TrainerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_trainer,parent,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.trainerName.setText(trainerList.get(position).getTrainerName());
holder.trainerLocation.setText(trainerList.get(position).getTrainerPhone());
holder.btnEnquiretrnr.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LayoutInflater li = LayoutInflater.from(activity);
View promptsView = li.inflate(R.layout.trainerenquiryform,null);
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setView(promptsView);
builder.setCancelable(false)
.setPositiveButton("Send", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
});
}
@Override
public int getItemCount() {
return trainerList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView trainerName,trainerLocation;
private Button btnEnquiretrnr;
public ViewHolder(View itemView) {
super(itemView);
trainerName=(TextView)itemView.findViewById(R.id.txt_Trainername);
trainerLocation=(TextView)itemView.findViewById(R.id.txt_trainerLocation);
btnEnquiretrnr=(Button)itemView.findViewById(R.id.btn_enquireTrnr);
}
}
}
为了将其实施到活动中，我们应该如何实施
public class Trainers extends AppCompatActivity {
RecyclerView trainersList;
List<Trainer> list;
ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_trainers);
pDialog = new ProgressDialog(this);
pDialog.setCancelable(false);
pDialog.setMessage("Loading,Please wait....");
pDialog.show();
trainersList =(RecyclerView)findViewById(R.id.list_trainers);
trainersList.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager= new LinearLayoutManager(getApplicationContext(),LinearLayoutManager.VERTICAL,false);
trainersList.setLayoutManager(layoutManager);
loadData();
}
private void loadData()
{
try {
Retrofit retrofit = new Retrofit.Builder().baseUrl(APIUrl.BASE_URL).addConverterFactory(GsonConverterFactory.create()).build();
APIService service = retrofit.create(APIService.class);
Call<Response> call = service.getTrainers();
call.enqueue(new Callback<Response>() {
@Override
public void onResponse(Call<Response> call, retrofit2.Response<Response> response) {
list=response.body().getTrainerList();
TrainerAdapter trainerAdapter=new TrainerAdapter(Trainers.this,list);
trainersList.setAdapter(trainerAdapter);
pDialog.hide();
}
@Override
public void onFailure(Call<Response> call, Throwable t) {
}
});
}
catch (Exception ex)
{
}
}
}
我希望这些答案能让很多人像我一样查询