[英]Switching fragments in navigation drawer
我希望能夠使用導航抽屜並根據導航中的選擇在不同的片段之間進行更改。
我正在使用Android Studio,基本上我所做的是:
然后,我在onNavigationDrawerItemSelected方法中更改了一些代碼。
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
Fragment fragment = new BlankFragment();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
我的程序崩潰了,並給了我很多我不理解的錯誤。 我究竟做錯了什么?
4168-4168/com.dev.kim.mytestapplication E/AndroidRuntime﹕ FATAL
EXCEPTION: main
Process: com.dev.kim.mytestapplication, PID: 4168
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dev.kim.mytestapplication/com.dev.kim.mytestapplication.MainActivity}:
java.lang.ClassCastException:
com.dev.kim.mytestapplication.MainActivity@e71881c must implement
OnFragmentInteractionListener
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.ClassCastException: com.dev.kim.mytestapplication.MainActivity@e71881c must implement
OnFragmentInteractionListener
at com.dev.kim.mytestapplication.BlankFragment.onAttach(BlankFragment.java:83)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:548)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1220)
at android.app.Activity.performStart(Activity.java:5949)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
使用向導創建“ Fragment
時,您留下了一個復選框以創建一個偵聽器。
所以你得到這個錯誤:
must implement
OnFragmentInteractionListener
如果您不想使用偵聽器,則可以在“ onAttach”中刪除以下代碼塊:
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
或者,您可以在活動中實現偵聽器。
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