应用程序在打开新活动时崩溃，原因是新导航栏。

huangapple
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英文:

App crashes when open new activity due to new navigation bar

问题

我的代码在我添加导航栏之前运行正常。现在当我尝试打开新活动时，它崩溃了。我尝试过 finish(); 但没有起作用，我认为这是因为我没有原始的重写 public void onCreate，但我不知道在哪里放置它与导航栏。

这是我的代码：

  1. public class DashboardFragment extends Fragment {
  3.     private DashboardViewModel dashboardViewModel;
  5.     public View onCreateView(@NonNull LayoutInflater inflater,
  6.                              ViewGroup container, Bundle savedInstanceState) {
  7.         dashboardViewModel =
  8.                 ViewModelProviders.of(this).get(DashboardViewModel.class);
  9.         View root = inflater.inflate(R.layout.fragment_dashboard, container, false);
  10.         final Button actvitybtn = root.findViewById(R.id.actvityb);
  12.         actvitybtn.setOnClickListener(new View.OnClickListener() {
  13.             @Override
  14.             public void onClick(View view) {
  15.                 openActivity1();
  16.                 int cat = 4;
  17.             }
  18.         });
  19.         return root;
  20.     }
  22.     public void openActivity1() {
  23.         Intent intent = new Intent(getActivity(), Activity1.class);
  24.         startActivity(intent);
  25.     }
  27. }

我的错误是运行时错误，以下是 Logcat 日志：

  1. 07-22 07:22:10.020 1602-1602/com.example.mhtdemo7 E/AndroidRuntime: FATAL EXCEPTION: main
  2. Process: com.example.mhtdemo7, PID: 1602
  3. android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.mhtdemo7/com.example.mhtdemo7.ui.home.HomeFragment}; have you declared this activity in your AndroidManifest.xml?
  4. at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1855)
  5. at android.app.Instrumentation.execStartActivity(Instrumentation.java:1546)
  6. at android.app.Activity.startActivityForResult(Activity.java:4298)
  7. at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:675)
  8. at androidx.core.app.ActivityCompat.startActivityForResult(ActivityCompat.java:234)
  9. at androidx.fragment.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:790)
  10. at androidx.fragment.app.FragmentActivity$HostCallbacks.onStartActivityFromFragment(FragmentActivity.java:932)
  11. at androidx.fragment.app.Fragment.startActivity(Fragment.java:1257)
  12. at androidx.fragment.app.Fragment.startActivity(Fragment.java:1245)
  13. at com.example.mhtdemo7.ui.dashboard.DashboardFragment.openActivity1(DashboardFragment.java:47)
  14. at com.example.mhtdemo7.ui.dashboard.DashboardFragment$1.onClick(DashboardFragment.java:38)
  15. at android.view.View.performClick(View.java:5716)
  16. at android.widget.TextView.performClick(TextView.java:10926)
  17. at android.view.View$PerformClick.run(View.java:22596)
  18. at android.os.Handler.handleCallback(Handler.java:739)
  19. at android.os.Handler.dispatchMessage(Handler.java:95)
  20. at android.os.Looper.loop(Looper.java:148)
  21. at android.app.ActivityThread.main(ActivityThread.java:7325)
  22. at java.lang.reflect.Method.invoke(Native Method)
  23. at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
  24. at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

希望这对你有所帮助。如果你需要进一步的帮助，请随时提问。

英文:

My code worked fine until I put a navigation bar in it. Now it crashes when I try and open a new activity. I've tried finish(); but that didn't work and I think its because I don't have the original override public void onCreate, but I don't know where I would put that with the navigation bar.

This is my code

  1.     public class DashboardFragment extends Fragment {
  3.     private DashboardViewModel dashboardViewModel;
  5.     public View onCreateView(@NonNull LayoutInflater inflater,
  6.                              ViewGroup container, Bundle savedInstanceState) {
  7.         dashboardViewModel =
  8.                 ViewModelProviders.of(this).get(DashboardViewModel.class);
  9.         View root = inflater.inflate(R.layout.fragment_dashboard, container, false);
  10.         final Button actvitybtn = root.findViewById(R.id.actvityb);
  12.         actvitybtn.setOnClickListener(new View.OnClickListener() {
  13.             @Override
  14.             public void onClick(View view) {
  15.                 openActivity1();
  16.                 int cat = 4;
  17.             }
  18.         });
  19.         return root;
  20.     }
  22.     public void openActivity1() {
  23.         Intent intent = new Intent(getActivity(), Activity1.class);
  24.         startActivity(intent);
  25.     }
  27. }

my error is runtime error this is logcat07-22 07:22:10.020 1602-

  1. 1602/com.example.mhtdemo7 E/AndroidRuntime: FATAL EXCEPTION: main
  2.     Process: com.example.mhtdemo7, PID: 1602
  3.     android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.mhtdemo7/com.example.mhtdemo7.ui.home.HomeFragment}; have you declared this activity in your AndroidManifest.xml?
  4.         at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1855)
  5.         at android.app.Instrumentation.execStartActivity(Instrumentation.java:1546)
  6.         at android.app.Activity.startActivityForResult(Activity.java:4298)
  7.         at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:675)
  8.         at androidx.core.app.ActivityCompat.startActivityForResult(ActivityCompat.java:234)
  9.         at androidx.fragment.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:790)
  10.         at androidx.fragment.app.FragmentActivity$HostCallbacks.onStartActivityFromFragment(FragmentActivity.java:932)
  11.         at androidx.fragment.app.Fragment.startActivity(Fragment.java:1257)
  12.         at androidx.fragment.app.Fragment.startActivity(Fragment.java:1245)
  13.         at com.example.mhtdemo7.ui.dashboard.DashboardFragment.openActivity1(DashboardFragment.java:47)
  14.         at com.example.mhtdemo7.ui.dashboard.DashboardFragment$1.onClick(DashboardFragment.java:38)
  15.         at android.view.View.performClick(View.java:5716)
  16.         at android.widget.TextView.performClick(TextView.java:10926)
  17.         at android.view.View$PerformClick.run(View.java:22596)
  18.         at android.os.Handler.handleCallback(Handler.java:739)
  19.         at android.os.Handler.dispatchMessage(Handler.java:95)
  20.         at android.os.Looper.loop(Looper.java:148)
  21.         at android.app.ActivityThread.main(ActivityThread.java:7325)
  22.         at java.lang.reflect.Method.invoke(Native Method)
  23.         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
  24.         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

答案1

得分: 2

你正试图使用 startActivity 打开一个 Fragment：

  1. Intent intent = new Intent(getActivity(), HomeFragment.class);

你不能这样做。这仅适用于活动。

英文:

You are trying to open a Fragment with startActivity:

  1. Intent intent = new Intent(getActivity(), HomeFragment.class);

You can't do it. It works with activities.

huangapple
  • 本文由 发表于 2020年7月22日 14:12:53
  • 转载请务必保留本文链接：https://go.coder-hub.com/63027999.html
  • android
  • java
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