public class MistakeGridFragment extends Fragment {
private Set<String> mistakeSelected = new HashSet<>();
private ListView listView;
private ITransfer iTransfer;
public MistakeGridFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.mistake_dialog, container, false);
MistakeListHelper mistakeListHelper = new MistakeListHelper(getActivity());
mistakeLists.addAll(mistakeListHelper.getAllMistakegrid());
init(view);
return view;
}
@TargetApi(23)
@Override
public void onAttach(Context context) {
super.onAttach(context);
try {
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
iTransfer = (ITransfer) context;
} catch (ClassCastException e) {
e.printStackTrace();
}
}
@Override
public void onAttach(Activity context) {
super.onAttach(context);
try {
// This makes sure that the container activity has implemented
// the callback interface. If not, it throws an exception
iTransfer = (ITransfer) context;
} catch (ClassCastException e) {
e.printStackTrace();
}
}
private void init(View view) {
relativeLayout = (LinearLayout) view.findViewById(R.id.mistakegrid_mainly);
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
// adding number of column
for (int i = 0; i < mistakeLists.size(); i++) {
String listvalue = mistakeLists.get(i).getListTypeValue();
String name = mistakeLists.get(i).getListTypeName();
Type type = new TypeToken<ArrayList<HashMap<Double, String>>>() {
}.getType();
ArrayList<HashMap<Double, String>> myMap = gson.fromJson(listvalue, type);
for (int j = 0; j < myMap.size(); j++) {
HashMap<Double, String> hash = myMap.get(j);
view = setTypeOfMistake(name, hash, j);
}
relativeLayout.addView(view);
}
}
private View setTypeOfMistake(final String mistakeName, HashMap<Double, String> hashValue, int i) {
optionsArraylist = new ArrayList<>();
//main mistake grid layout here added column
LayoutInflater layoutInflatermain = LayoutInflater.from(getActivity());
View main = layoutInflatermain.inflate(R.layout.mistake_column_layout, null);
LinearLayout linearLayout = (LinearLayout) main.findViewById(R.id.linaerlayout);
//here added row layout for each column
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
View view = layoutInflater.inflate(R.layout.mistake_row_layout, null);
TextView mistakeType = (TextView) view.findViewById(R.id.header_tv);
listView = (ListView) view.findViewById(R.id.listview);
Set set = (Set) hashValue.entrySet();
Iterator it = set.iterator();
optionsArraylist.clear();
while (it.hasNext()) {
HashMap<Double, String> hashMap = new HashMap<>();
Map.Entry entry = (Map.Entry) it.next();
optionsArraylist.add((String) entry.getValue());
hashMap.put((Double) entry.getKey(), (String) entry.getValue());
mistakeHashArryList.add(hashMap);
}
mistakeType.setText(mistakeName + "");
ArrayAdapter<String> adaptor = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, optionsArraylist);
listView.setAdapter(adaptor);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
toggleSelection(optionsArraylist.get(position).toString(), view);
//Toast.makeText(QuestionActivity.this,parent.getItemAtPosition(position).toString(),Toast.LENGTH_SHORT).show();
if (mistakeSelected.contains(parent.getItemAtPosition(position).toString())) {
mistakeSelected.remove(parent.getItemAtPosition(position).toString());
view.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.md_blue_grey_400));
} else {
mistakeSelected.add(parent.getItemAtPosition(position).toString());
view.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.md_blue_grey_500));
}
}
});
linearLayout.addView(view);
return linearLayout;
}
public boolean getMistake() {
if (mistakeSelected.size() > 0) {
iTransfer.getData(mistakeSelected);
return true;
} else {
new MyUtils(getActivity()).setMessageShort("Please selected any one mistake");
}
return false;
}
public interface ITransfer {
public void getData(Set<String> strings);
}
public class MistakeReasonFragment extends Fragment implements MistakeGridFragment.ITransfer {
private ArrayList<String> arrayList = new ArrayList<>();
private TableLayout tableLayout;
private LayoutInflater layoutInflater;
private LinearLayout addMistake_row;
public MistakeReasonFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.mistake_reason_layout, container, false);
init(view);
return view;
}
private void init(View view) {
tableLayout = (TableLayout) view.findViewById(R.id.tablelayout);
addMistake_row = (LinearLayout) view.findViewById(R.id.linaerl_row);
}
@Override
public void onPause() {
EventBus.getDefault().unregister(this);
super.onPause();
}
@Override
public void getData(Set<String> strings) {
Log.v("value size ", strings.size() + " ");
}
}
logcat的：
java.lang.ClassCastException：com.android.root.ui.activity.QueActivity无法强制转换为com.tapasya.root.tapasya.ui.fragment.MistakeGridFragment $ ITransfer
10-27 11：44：54.811 30409-30409 / com.tapasya.root.tapasya W / System.err：
在com.android.root.ui.fragment.MistakeGridFragment.onAttach（MistakeGridFragment.java:70）
10-27 11：44：54.811 30409-30409 / com.android.root W / System.err：
在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1043）
10-27 11：44：54.811 30409-30409 / com.android.root W / System.err：
在android.support.v4.app.BackStackRecord.setLastIn（BackStackRecord.java:838）
10-27 11：44：54.811 30409-30409 / com.android.root W / System.err：
在android.support.v4.app.BackStackRecord.calculateFragments（BackStackRecord.java:861）
答案 0 :(得分：0)
因为onAttach（）中的上下文实例是片段的容器活动的实例，所以请确保容器活动已实现ITransfer回调，否则您无法在onAttach（）中强制转换上下文对象的实例ITransfer参考变量。