java - fragment java.lang.ClassCastException错误

Question

如何转换Fragment Activity ？

实际上我正在尝试通过Activity上的按钮打开Fragment Activity

Android MainFest:

<activity android:name="parth.any.ttb.Fragment_1"/>

LogCat:

12-04 15:22:43.132: E/AndroidRuntime(25873): FATAL EXCEPTION: main
12-04 15:22:43.132: E/AndroidRuntime(25873): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{parth.any.ttb/parth.any.ttb.Fragment_1}: java.lang.ClassCastException: parth.any.ttb.Fragment_1
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.os.Looper.loop(Looper.java:130)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.app.ActivityThread.main(ActivityThread.java:3687)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at java.lang.reflect.Method.invokeNative(Native Method)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at java.lang.reflect.Method.invoke(Method.java:507)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at dalvik.system.NativeStart.main(Native Method)
12-04 15:22:43.132: E/AndroidRuntime(25873): Caused by: java.lang.ClassCastException: parth.any.ttb.Fragment_1
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
12-04 15:22:43.132: E/AndroidRuntime(25873):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565

)

这是两个类代码:编辑:NewTransaction.java

startActivity(new Intent(getApplicationContext(), Fragment_1.class));

Fragment_1.java

public class Fragment_1 extends Fragment implements OnClickListener {
        TextView Home;
        Animation animMove;

        // slide menu items
        private String[] spinMenuTitles;
        private TypedArray spinMenuIcons;
        private Button Add_New;     
        private ArrayList<TypeCustomSpinnerItem> spinDropItems;
        private TypeSpinnerListAdapter adapter;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        View view = inflater.inflate(R.layout.fragment_1, null);
        Home = (TextView)view.findViewById(R.id.home);
        Add_New = (Button)view.findViewById(R.id.add_new);
        Add_New.setOnClickListener(this);

        animMove = AnimationUtils.loadAnimation(getActivity(),R.anim.move);
        Home.startAnimation(animMove);

                // load type spin menu items
                spinMenuTitles = getResources().getStringArray(R.array.type_spinner_items);

                // type spinner icons from resources
                spinMenuIcons = getResources().obtainTypedArray(R.array.type_spinner_icons);

                spinDropItems = new ArrayList<TypeCustomSpinnerItem>();

                // adding type spinner items to array
                int i;
                for(i=0;i<=9;i++)
                {
                spinDropItems.add(new TypeCustomSpinnerItem(spinMenuTitles[i], spinMenuIcons.getResourceId(i, -1)));
                }
                // Recycle the typed array
                spinMenuIcons.recycle();

                Spinner mySpinner = (Spinner)view.findViewById(R.id.spinner1);
                adapter = new TypeSpinnerListAdapter(getActivity(),spinDropItems);
                mySpinner.setAdapter(adapter);

        return view;
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.add_new:
            Intent addintent = new Intent(getActivity() , AddNewTransaction.class);
            startActivity(addintent);
            break;

    }
    }
}

Answer 1

您不能将 fragment 作为 Activity 启动，它们需要添加到 Activity 中。

在文档 here 中了解更多信息.

另请参阅this