我是一个回收器适配器，我在其中添加了一个接口，用于处理适配器到片段之间的数据传输。我想通过position和string
适配器代码：
public FiltersAdapter(Context mContext, ClickEvent clickEvent) {
}
public interface ClickEvent {
void clickItemEvent(int position, String str);
}
ClickEvent clickEvent;
public void setClickEvent (ClickEvent clickEvent){
this.clickEvent = clickEvent;
}
@Override
public void onBindViewHolder(final FiltersAdapter.MyViewHolder holder, final int position) {
holder.mOrganizer.setText(filtersList.get(position));
holder.mLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (holder.mOrganizerCheck.isChecked()) {
holder.mOrganizerCheck.setChecked(false);
} else {
holder.mOrganizerCheck.setChecked(true);
int pos = holder.getAdapterPosition();
//filtersList.get(pos);
clickEvent.clickItemEvent(position, filtersList.get(pos));
}
}
});
holder.mOrganizerCheck.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
holder.mLayout.setBackgroundResource(R.drawable.selected_list_item);
} else {
holder.mLayout.setBackgroundResource(R.drawable.unselected_list_item);
}
// if(Utility.isTablet(mContext))
// ((FragmentTabMyLibraryFilterBy) mContext).addChoosedFiles(mChoosebleFilesList.get(position).trim(), isChecked);
// else
// ((FragmentMyLibraryFilterBy) mContext).addChoosedFiles(mChoosebleFilesList.get(position).trim(), isChecked);
}
});
}
这里是片段代码来处理从适配器接收的数据。
public class EventFilterFragment extends Fragment {
private Context mContext;
// Member variables
public static final String TAG = EventFilterFragment.class.getSimpleName();
private View mFilterView = null;
private List<String> mOrganizer = new ArrayList<>();
private RecyclerView mrvFilterBySender;
private FiltersAdapter mFiltersAdapter;
private ArrayList<String> mListOrganizer;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
if (null != getArguments()) {
mListOrganizer = getArguments().getStringArrayList("OrgList");
}
mFilterView = inflater.inflate(R.layout.fragment_event_filter, container, false);
initView();
mContext = getContext();
return mFilterView;
}
private void initView() {
mrvFilterBySender = (RecyclerView) mFilterView.findViewById(R.id.rvFilterBySender);
mFiltersAdapter = new FiltersAdapter(getActivity(), mListOrganizer);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(mContext);
mrvFilterBySender.setLayoutManager(mLayoutManager);
mrvFilterBySender.setAdapter(mFiltersAdapter);
mFiltersAdapter.notifyDataSetChanged();
// Ajay's code
mrvFilterBySender.setAdapter(mFiltersAdapter);
//mFiltersAdapter.setClickEvent((FiltersAdapter.ClickEvent) this);
FiltersAdapter filtersAdapter = new FiltersAdapter(mContext, new FiltersAdapter.ClickEvent() {
@Override
public void clickItemEvent(int position, String str) {
Toast.makeText(mContext, "Position is" +position, Toast.LENGTH_SHORT).show();
}
});
/*mrvFilterBySender.setRecyclerListener(new RecyclerView.RecyclerListener() {
@Override
public void onViewRecycled(RecyclerView.ViewHolder holder) {
holder.getAdapterPosition();
}
});*/
}
}
当我尝试运行该应用时，出现此错误：
Unable to start activity ComponentInfo{com.emc.orgly/com.emc.orgly.dialer.activity.EventFilterActivity}: java.lang.ClassCastException: com.emc.orgly.dialer.fragment.EventFilterFragment cannot be cast to com.emc.orgly.dialer.adapter.FiltersAdapter$ClickEvent
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.emc.orgly/com.emc.orgly.dialer.activity.EventFilterActivity}: java.lang.ClassCastException: com.emc.orgly.dialer.fragment.EventFilterFragment cannot be cast to com.emc.orgly.dialer.adapter.FiltersAdapter$ClickEvent
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.ClassCastException: com.emc.orgly.dialer.fragment.EventFilterFragment cannot be cast to com.emc.orgly.dialer.adapter.FiltersAdapter$ClickEvent
at com.emc.orgly.dialer.fragment.EventFilterFragment.initView(EventFilterFragment.java:73)
at com.emc.orgly.dialer.fragment.EventFilterFragment.onCreateView(EventFilterFragment.java:55)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2192)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1299)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:388)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:607)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1248)
at android.app.Activity.performStart(Activity.java:6696)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2628)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
如何正确投射？
答案 0 :(得分：0)
卸下：
//Adapter
public void setClickEvent (ClickEvent clickEvent){
this.clickEvent = clickEvent;
}
//Fragmnet
mFiltersAdapter.setClickEvent((FiltersAdapter.ClickEvent) this);
根据你的代码应该做的伎俩
答案 1 :(得分：0)
您尚未在此处实现导致问题的片段接口。 您需要将片段的签名更改为。
public class EventFilterFragment extends Fragment implements ClickEvent{
//override method
}
也不要忘记打电话给片段。
mFiltersAdapter.setClickEvent( this);
您的代码应如下所示
public class EventFilterFragment extends Fragment implements ClickEvent{
private Context mContext;
// Member variables
public static final String TAG = EventFilterFragment.class.getSimpleName();
private View mFilterView = null;
private List<String> mOrganizer = new ArrayList<>();
private RecyclerView mrvFilterBySender;
private FiltersAdapter mFiltersAdapter;
private ArrayList<String> mListOrganizer;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
if (null != getArguments()) {
mListOrganizer = getArguments().getStringArrayList("OrgList");
}
mFilterView = inflater.inflate(R.layout.fragment_event_filter, container, false);
initView();
mContext = getContext();
return mFilterView;
}
private void initView() {
mrvFilterBySender = (RecyclerView) mFilterView.findViewById(R.id.rvFilterBySender);
mFiltersAdapter = new FiltersAdapter(getActivity(), this);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(mContext);
mrvFilterBySender.setLayoutManager(mLayoutManager);
mrvFilterBySender.setAdapter(mFiltersAdapter);
mFiltersAdapter.notifyDataSetChanged();
// Ajay's code
mrvFilterBySender.setAdapter(mFiltersAdapter);
/*mrvFilterBySender.setRecyclerListener(new RecyclerView.RecyclerListener() {
@Override
public void onViewRecycled(RecyclerView.ViewHolder holder) {
holder.getAdapterPosition();
}
});*/
}
@Override
public void clickItemEvent(int position, String str){
//perform actions
}
}
<强>通知 我想我已经得到了你的问题
mFiltersAdapter = new FiltersAdapter(getActivity(), mListOrganizer);
此行不正确请参阅其构造函数接受上下文和ClickEvent对象的FiltersAdapter，但我们正在传递mListOrganizer。正确的行是
mFiltersAdapter = new FiltersAdapter(getActivity(), this);