android.content.ActivityNotFoundException:找不到显式活动类 {您是否在 And

Question

我遇到了这些错误

android.content.ActivityNotFoundException：找不到显式活动类 {};您是否在 AndroidManifest .xml中声明了此活动？ at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java：2005( at android.app.Instrumentation.execStartActivity(Instrumentation.java：1673( at android.app.Activity.startActivityForResult(Activity.java：4586( at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java：676( at androidx.core.app.ActivityCompat.startActivityForResult(ActivityCompat.java：234( at androidx.fragment.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java：791( at androidx.fragment.app.FragmentActivity$HostCallbacks.onStartActivityFromFragment(FragmentActivity.java：933( at androidx.fragment.app.Fragment.startActivity(Fragment.java：1185( at androidx.fragment.app.Fragment.startActivity(Fragment.java：1173( at com.example.gerobokgo.AccountFragment.openUpdateProfile(AccountFragment.java：110( at com.example.gerobokgo.AccountFragment.access$000(AccountFragment.java：29( at com.example.gerobokgo.AccountFragment$2.onClick(AccountFragment.java：93(

我对这些code有error

// For update and pass information method
private void openUpdateProfile() {
Intent intent= new Intent(getActivity(), UpdateProfileFragment.class);
//pass value from current to next page
intent.putExtra("name",tv_name.getText().toString().trim());
intent.putExtra("email", tv_email.getText().toString().trim());
intent.putExtra("Home Address",tv_home.getText().toString().trim());
intent.putExtra("Telephone", tv_phone.getText().toString().trim());
startActivity(intent);
}

public class AccountFragment extends Fragment  

//For Update Method
btn_update.setOnClickListener( new View.OnClickListener(){
@Override
public void onClick(View view) {
openUpdateProfile();
}

安卓清单

<application
android:name=".Home"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".RegisterActivity"
android:screenOrientation="portrait"></activity>
<activity android:name=".LoginActivity"
android:screenOrientation="portrait"/>
<activity
android:name=".splashScreen"
android:theme="@style/SplashScreen">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:theme="@style/AppTheme" />
</application>

更新配置文件片段.java

public class UpdateProfileFragment extends Fragment implements View.OnClickListener {
EditText tv_name, tv_email, tv_home, tv_phone;
Button btn_update;
FirebaseAuth firebaseAuth;
FirebaseUser currentUser;
DatabaseReference databaseReference;

public UpdateProfileFragment() {
// Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_update_profile, container, false);

//get data from intert (data from previous page)
Intent intent = getActivity().getIntent();
String name = intent.getStringExtra("Name");
String email = intent.getStringExtra("Email");
String address = intent.getStringExtra(" Shipping Address");
String phone = intent.getStringExtra("Telephone Number");
//ini
firebaseAuth = FirebaseAuth.getInstance();
currentUser = firebaseAuth.getCurrentUser();
databaseReference = FirebaseDatabase.getInstance().getReference("Customer").child(firebaseAuth.getUid());
tv_name = view.findViewById(R.id.tv_name);
tv_email = view.findViewById(R.id.tv_email);
tv_home = view.findViewById(R.id.tv_home);
tv_phone = view.findViewById(R.id.tv_phone);
tv_name.setText(name);
tv_email.setText(email);
tv_home.setText(address);
tv_phone.setText(phone);
btn_update.setOnClickListener(this);

return view;
}
@Override
public void onClick(View view) {
}
private void updateProfile() {
Intent intent = getActivity().getIntent();
String userUid = firebaseAuth.getCurrentUser().getUid();
String name = tv_name.getText().toString().trim();
String email = tv_email.getText().toString().trim();
String home = tv_home.getText().toString().trim();
String phone = tv_phone.getText().toString().trim();
Customer cust = new Customer(userUid, name, email, home, phone);
databaseReference.child("Customer").child(userUid).setValue(cust).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()) {
Toast.makeText(getActivity(), "Update Successfully", Toast.LENGTH_SHORT).show();
getActivity().finish();
startActivity(new Intent(getActivity(), AccountFragment.class));

}
}
});
}
}

Answer 1

根据你的说法，UpdateProfileFragment是一个片段。

所以你不能通过startActivity()打电话给fragment.要从活动中调用fragemnt，您必须执行以下操作。

UpdateProfileFragment frag = new UpdateProfileFragment ();
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.fragmentContainer,frag,"Test Fragment");
transaction.commit();

此外，您可以使用setArguments将数据传递给fragment

例：

private void openUpdateProfile() {
Bundle bundle = new Bundle();
bundle.putString("name",tv_name.getText().toString().trim());
bundle.putString("email", tv_email.getText().toString().trim());
bundle.putString("home_address",tv_home.getText().toString().trim());
bundle.putString("telephone", tv_phone.getText().toString().trim());
UpdateProfileFragment frag = new UpdateProfileFragment ();
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
frag.setArguments(bundle);
transaction.add(R.id.fragmentContainer,frag,"Test Fragment");
transaction.commit();
}

在您的fragment中，您可以获得以下data

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
.....
String name = this.getArguments().getString("name");
String email = this.getArguments().getString("email");
String address= this.getArguments().getString("home_address");
String telephone= this.getArguments().getString("telephone");
// rest of your code here.
...
...
}

希望对您有所帮助。

Answer 2

根据你的代码UpdateProfileFragment是openUpdateProfile方法中的活动。

在使用之前，您应该在AndroidManifest中声明 UpdateProfileFragment 活动。

编辑：

由于 UpdateProfileFragment 是片段，因此您通过 startActivity(( 以错误的方式调用片段。要从活动中调用 fragemnt 如下 -

private void openUpdateProfile() {
Bundle bundle = new Bundle();
bundle.putString("name",tv_name.getText().toString().trim());
bundle.putString("email", tv_email.getText().toString().trim());
bundle.putString("home_address",tv_home.getText().toString().trim());
bundle.putString("telephone", tv_phone.getText().toString().trim());
UpdateProfileFragment updateFrag = new UpdateProfileFragment ();
FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
updateFrag.setArguments(bundle);
transaction.add(R.id.fragmentContainer, updateFrag);
transaction.commit();
}

在UpdateProfileFragment中，您可以获得如下数据

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
String name = getArguments().getString("name");
String email = getArguments().getString("email");
String address= getArguments().getString("home_address");
String telephone= getArguments().getString("telephone");
// rest of your code here.
...
...

}

注意：如果 UpdateProfileFragment 是片段，则无需在清单文件中声明。