Java MainActivity无法强制转换为android.app.Activity
我知道这个问题已经被问了很多次,我一直在试图解决它,但我似乎真的不明白问题是什么。我对安卓工作室和安卓工作室都是新手,所以老实说,我几乎不知道自己在做什么。根据logcat告诉我的,我假设错误发生在MainActivity.java类中。这是我的日志Java MainActivity无法强制转换为android.app.Activity,java,android,Java,Android,我知道这个问题已经被问了很多次,我一直在试图解决它,但我似乎真的不明白问题是什么。我对安卓工作室和安卓工作室都是新手,所以老实说,我几乎不知道自己在做什么。根据logcat告诉我的,我假设错误发生在MainActivity.java类中。这是我的日志 2020-06-15 01:33:41.885 21773-21773/com.example.hoply5 E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.hoply5,
2020-06-15 01:33:41.885 21773-21773/com.example.hoply5 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.hoply5, PID: 21773
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.hoply5/com.example.hoply5.MainActivity}: java.lang.ClassCastException: com.example.hoply5.MainActivity cannot be cast to android.app.Activity
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3272)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3500)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2049)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)
Caused by: java.lang.ClassCastException: com.example.hoply5.MainActivity cannot be cast to android.app.Activity
at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:41)
at android.app.Instrumentation.newActivity(Instrumentation.java:1253)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3260)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3500)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2049)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:941)
这是我的主要活动课
public class SecondFragment extends Fragment {
EditText editTxtName, editTxtEmail, editTxtPwd, editTextCnfPwd;
Button backBtn, registerBtn;
private UserDao userDao;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_second, container, false);
editTxtName = view.findViewById(R.id.editName);
editTxtEmail = view.findViewById(R.id.editEmail);
editTxtPwd = view.findViewById(R.id.editPwd);
registerBtn = view.findViewById(R.id.registerBtn2);
editTextCnfPwd = view.findViewById(R.id.editCnfPwd);
backBtn = view.findViewById(R.id.backBtn);
backBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), MainActivity.class);
startActivity(intent);
}
});
userDao = Room.databaseBuilder(getActivity(), UserDatabase.class, "User").build().getUserDao();
registerBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String userName = editTxtName.getText().toString().trim();
String email = editTxtEmail.getText().toString().trim();
String password = editTxtPwd.getText().toString().trim();
String passwordCnf = editTextCnfPwd.getText().toString().trim();
if(password.equals(passwordCnf)) {
User user = new User(userName,password,email);
userDao.insert(user);
Intent transitionLogin = new Intent(getActivity(), MainActivity.class);
startActivity(transitionLogin);
} else {
Toast.makeText(getActivity(), "Password is not matching", Toast.LENGTH_SHORT).show();
}
}
});
return view;
}
}你的主要活动是片段,所以你必须替换它嗨~你发布的代码似乎是第二个片段,也许你粘贴了错误的代码?@Hababa-hmm,我会试试。然而,如果我这样做了,我在做意图陈述时似乎不能使用这个,那么还有其他的选择吗?哦,我说的可能是你粘贴了错误的代码,这意味着我认为你在StackOverflow上发布的代码可能是错误的。您可以看到,您请求的是MainActivity类,但您发布的代码是SecondFragment。