我有一个问题：我在我的应用程序中使用SugarORM，在AndroidManifest中我需要设置：
<meta-data android:name="DATABASE" android:value="moneyManager.db" />
<meta-data android:name="VERSION" android:value="1"/>
<meta-data android:name="QUERY_LOG" android:value="true"/>
<meta-data android:name="DOMAIN_PACKAGE_NAME" android:value="ua.marinovskiy.moneymanager" />
而且：
android:name="com.orm.SugarApp"
现在，当我从适配器使用startActivityForResult时：
Intent intent = new Intent(context, NewOperation.class);
((Activity) context).startActivityForResult(intent, MainFragment.REQUEST_CODE);
我接受了这个错误：
java.lang.ClassCastException: com.orm.SugarApp cannot be cast to android.app.Activity
我的问题：如何从Manifest文件或其他方法中删除此android：name =“com.orm.SugarApp”以解决此问题？
修改
public class MainFragment extends Fragment {
public final static int REQUEST_CODE = 1;
ViewPager viewPager;
PagerAdapter viewPagerAdapter;
List<List<CategoryParent>> list;
List<Integer> balance_list = new ArrayList<>();
List<String> periods_list = new ArrayList<>();
SugarHelper sugarHelper;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main,
container, false);
sugarHelper = new SugarHelper();
list = sugarHelper.readAllOoerations(MainActivity.type_of_period, MainActivity.min_date, MainActivity.max_date, MainActivity.addedDate, balance_list);
periods_list = sugarHelper.getPeriods();
viewPager = (ViewPager) view.findViewById(R.id.pager);
viewPagerAdapter = new ViewPagerAdapter(getActivity().getApplicationContext(), list, balance_list, periods_list);
viewPager.setAdapter(viewPagerAdapter);
viewPager.setCurrentItem(MainActivity.addedDate);
return view;
}
@Override
public void onResume() {
super.onResume();
list.clear();
list.addAll(sugarHelper.readAllOoerations(MainActivity.type_of_period, MainActivity.min_date, MainActivity.max_date, MainActivity.addedDate, balance_list));
if (!list.isEmpty()) {
viewPagerAdapter.notifyDataSetChanged();
viewPager.setAdapter(viewPagerAdapter);
viewPager.setCurrentItem(MainActivity.addedDate);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == getActivity().RESULT_OK) {
Toast.makeText(getActivity().getApplicationContext(), "done", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity().getApplicationContext(), "cancel", Toast.LENGTH_SHORT).show();
}
}
}
我的ViewPagerAdapter类：
public class ViewPagerAdapter extends PagerAdapter {
private OperationsAdapter operationsAdapter;
private List<CategoryParent> categoryParentArrayList;
private ExpandableListView expandableListView;
TextView tv_balance, empty, current_period;
Context context;
List<List<CategoryParent>> list;
List<Integer> balance_list;
List<String> periods;
LayoutInflater inflater;
SugarHelper sugarHelper;
public ViewPagerAdapter(Context context, List<List<CategoryParent>> list, List<Integer> balance_list, List<String> periods) {
this.context = context;
this.list = list;
this.balance_list = balance_list;
this.periods = periods;
}
@Override
public int getCount() {
return list.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.viewpager_item, container,
false);
sugarHelper = new SugarHelper();
tv_balance = (TextView) view.findViewById(R.id.balance_operations);
current_period = (TextView) view.findViewById(R.id.current_period);
current_period.setText(periods.get(position));
setBalance(balance_list, position);
expandableListView = (ExpandableListView) view.findViewById(R.id.expListView);
categoryParentArrayList = list.get(position);
if (!categoryParentArrayList.isEmpty()) {
empty = (TextView) view.findViewById(R.id.if_empty);
empty.setVisibility(View.INVISIBLE);
operationsAdapter = new OperationsAdapter(context, categoryParentArrayList);
expandableListView.setAdapter(operationsAdapter);
expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
v.setBackgroundColor(Color.parseColor("#B2EBF2"));
Intent intent = new Intent(context, NewOperation.class);
MainFragment mainFragment = new MainFragment();
mainFragment.startActivityForResult(intent, MainFragment.REQUEST_CODE);
return false;
}
});
expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
Toast.makeText(context, "group", Toast.LENGTH_LONG).show();
return false;
}
});
}
((ViewPager) container).addView(view);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((RelativeLayout) object);
}
public void setBalance(List<Integer> balance_list, int position) {
tv_balance.setText("Balance: $" + balance_list.get(position));
if (balance_list.get(position) < 0) {
tv_balance.setBackgroundResource(R.drawable.balance_minus_style);
} else {
tv_balance.setBackgroundResource(R.drawable.balance_plus_style);
}
}
例外：
09-03 14:40:03.915 13091-13091/ua.marinovskiy.moneymanager E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Fragment MainFragment{426ee278} not attached to Activity
at android.support.v4.app.Fragment.startActivityForResult(Fragment.java:906)
at ua.marinovskiy.moneymanager.adapter.ViewPagerAdapter$1.onChildClick(ViewPagerAdapter.java:95)
at android.widget.ExpandableListView.handleItemClick(ExpandableListView.java:583)
at android.widget.ExpandableListView.performItemClick(ExpandableListView.java:522)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:2812)
at android.widget.AbsListView$1.run(AbsListView.java:3571)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5297)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
ua.marinovskiy.moneymanager.adapter.ViewPagerAdapter $ 1.onChildClick（ViewPagerAdapter.java:95）
在mainFragment.startActivityForResult（intent，MainFragment.REQUEST_CODE）;
SOLUTION：
我离开了 当我在getActivity（）上调用适配器getActivity（）。getApplicationContext（）时，((Activity) context).startActivityForResult(intent, MainFragment.REQUEST_CODE);并更改片段。
答案 0 :(得分：2)
你必须在你的清单中指定com.orm.SugarApp，没有避免这种情况。
您正尝试将context投射到此行中的某个活动：
((Activity) context).startActivityForResult(intent, MainFragment.REQUEST_CODE);
context实际上是com.orm.SugarApp的一个实例，因此您可能会遇到崩溃。
由于您是从Fragment执行此操作，因此请改用以下代码：
getActivity().startActivityForResult(intent, MainFragment.REQUEST_CODE);
更新：
不要将Application上下文传递给适配器，传递Activity上下文：
这是错误的：
viewPagerAdapter = new ViewPagerAdapter(getActivity().getApplicationContext(), list, balance_list, periods_list);
viewPager.setAdapter(viewPagerAdapter);
请改为：
viewPagerAdapter = new ViewPagerAdapter(getActivity(), list, balance_list, periods_list);
viewPager.setAdapter(viewPagerAdapter);
更新：
您正在实例化片段，而不是将其附加到任何内容，然后尝试使用它来触发startActivitiesForResult意图。这是错误的，使用适配器中已有的上下文：
改变这个：
MainFragment mainFragment = new MainFragment();
mainFragment.startActivityForResult(intent, MainFragment.REQUEST_CODE);
对此：
((Activity) context).startActivityForResult(intent, MainFragment.REQUEST_CODE);