Here's my code for clicking the button from my class showInforActivity :
btnRegister.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(showInfoActivity.this, InformationFragment.class);
startActivity(intent);
}
});
Whenever I click the button I got error Unable to find explicit activity class {com.example.drawerapplication/com.example.drawerapplication.ui.information.InformationFragment}; have you declared this activity in your AndroidManifest.xml?
Unable to find explicit activity class {com.example.drawerapplication/com.example.drawerapplication.ui.information.InformationFragment}; have you declared this activity in your AndroidManifest.xml?
and it loads the previous class and layout instead of loading this InformationFragment class:
package com.example.drawerapplication.ui.information;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import com.example.drawerapplication.databinding.FragmentInformationBinding;
public class InformationFragment extends Fragment {
private FragmentInformationBinding binding;
private EditText name, address, age, contact;
private Button btnAdd, btnViewData;
DatabaseHelper mDatabaseHelper;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
binding = FragmentInformationBinding.inflate(inflater, container, false);
View root = binding.getRoot();
name = binding.name;
address = binding.address;
age = binding.age;
contact = binding.contact;
btnAdd = binding.add;
btnViewData = binding.viewdata;
mDatabaseHelper = new DatabaseHelper(getActivity());
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (name.length() != 0 && address.length() != 0
&& age.length() != 0 && contact.length() != 0){
mDatabaseHelper.addData(name.getText().toString(), address.getText().toString(),
age.getText().toString().trim(), Long.valueOf(contact.getText().toString().trim()));
toastMessages("Data Successfully Inserted!");
}else {
toastMessages("Please complete all the requirements needed");
}
}
});
btnViewData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getContext(), ListDataActivity.class);
startActivity(intent);
}
});
return root;
}
@Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
private void toastMessages(String message){
Toast.makeText(getContext(),message,Toast.LENGTH_SHORT).show();
}
}
The layout of this InformationFragment is fragment_information :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".ui.information.InformationFragment"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp">
...
Heres my **AndroidManifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.drawerapplication">
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
tools:ignore="ScopedStorage" />
<application
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/Theme.DrawerApplication">
<activity android:name=".ui.information.ListDataActivity"/>
<activity android:name=".ui.information.showInfoActivity"/>
<activity
android:name=".MainActivity"
android:exported="true"
android:label="@string/app_name"
android:theme="@style/Theme.DrawerApplication.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I tried adding InformationFragment
there however, it says Class referenced in the manifest, com.example.drawerapplication.InformationFragment, was not found in the project or the libraries
Please let me know what I'm missing or if you need more information. Thanks!
You cannot use an Intent
to start/create a Fragment
much like you would for an Activity
. A Fragment
actually lives inside an Activity
ie its lifecycle is bound to an Activity
. To start a Fragment
you have to use the FragmentManager
that is available with the Activity
instance
This error is coming up because Android thinks that your InformationFragment
is an Activity
rather than a Fragment
and hence it is asking you if you have declared it in your AndroidManifest.xml
file because as the rule says, you need to have each Activity
in your app declared inside the AndroidManifest.xml
file
So, now you can use something like this , inside your showInfoActivity . Technically there are many solutions available as to what you could essentially do and that's why I linked you to all possible solutions rather than just writing them here
You can not use Intent
for navigate to Fragment
from a Activity
. For this reason you are getting this error. As, Intent receive 2 parameter Intent(FromActivity, ToActivity.class)
. you are using fragment in 2nd parameter. We know that, when we create a activity then it it declared with AndroidManifest.xml
file. Here, in your manifest file there are not any activity called InformationFragment
.
You can learn Android Navigation Component to easily communicate with Activity and fragments.
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