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How to resolve symbol 'list'?

Problem
Currently, I'm trying to use a ListView in my app but when I changed the id of my ListView to #android:id/list to fix the previous error of "My content must include a ListView whose id is android.r.id.list" it made it impossible to use R.id.list in my setListAdapter and gave the new error that I'm trying to get fixed "Cannot resolve symbol 'list'"
What I've tried
-invalidating caches
Code MainActivity.java
package com.example.cakeapp;
import android.app.ListActivity;
import android.content.Intent;
import android.net.Uri;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.Spinner;
import android.widget.TextView;
import com.example.cakeapp.R;
public class MainActivity extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String[] dessert={"Chocolate Mousse",
"Chocolate Cake",
"Chocolate Macaroons",
"Chocolate Cafe Website",
"Dessert Selection"};
setListAdapter(new ArrayAdapter<String>(this, R.layout.activity_main, R.id.list, dessert));
}
}
Code activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
Code AndroidManifest.xml
<?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.cakeapp">
<application
android:allowBackup="true"
android:dataExtractionRules="#xml/data_extraction_rules"
android:fullBackupContent="#xml/backup_rules"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.CakeApp"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

You should use android:id="#+id/list" instead of android:id="#android:id/list"
Edit your activity_main.xml file to :
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Java Resource errors

We are having a resource error when we try to run our code.
package com.example.searchtest;
import android.app.Activity;
import android.app.SearchManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
public class GoogleSearchIntentActivity extends Activity {
private EditText editTextInput;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editTextInput = (EditText) findViewById(R.id.editTextInput);
}
public void onSearchClick(View v)
{
try {
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
String term = editTextInput.getText().toString();
intent.putExtra(SearchManager.QUERY, term);
startActivity(intent);
} catch (Exception e) {
// TODO: handle exception
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="10dp">
<edittext
android:id="#+id/editTextInput"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter search text">
<requestfocus>
</requestfocus></edittext>
<button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search"
android:layout_gravity="center"
android:onclick="onSearchClick"
android:layout_margintop="10dp">
</button></linearlayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.searchtest">
<uses-permission android:name="android.permission.INTERNET">
</uses-permission>
<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/AppTheme">
<activity android:name=".GoogleSearchIntentActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
these are our mainActivity.java, activity_main.xml, and AndroidManifest.xml codes from our app.
The error is within our public class GoogleSearchIntentActivity extends Activity
We are high school students trying to create an image search app for our computer science capstone class, we have been trying to fix this error without success, and our teacher is completely clueless.

Components in your xml file must have a first capitalized letter.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="10dp">
<EditText
android:id="#+id/editTextInput"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter search text">
<requestFocus>
</requestFocus></EditText>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search"
android:layout_gravity="center"
android:onclick="onSearchClick"
android:layout_margintop="10dp">
</Button></LinearLayout>

All Buttons with Intent Don't work

Goal:
When I press one of the buttons, you should be referred into a next intent page.
Problem:
It only works for button named "Activity 1" but not the remaining buttons although you use the same source code for button "Activity 1", "Activity 2" and "Activity 3".
What part am I missing?
Thank you!
Info:
*I'm new in android
*I'm using API 23
androidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jfdimarzio.application">
<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/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".firstactivity">
</activity>
<activity android:name=".activity2">
</activity>
</application>
</manifest>
MainActivity.java
package com.jfdimarzio.application;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import static android.R.attr.value;
public class MainActivity extends AppCompatActivity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
if(intent != null)
{
String valuee = intent.getStringExtra("key");
if(valuee != null)
{
final TextView textViewToChange = (TextView) findViewById(R.id.txtvw_activity1);
textViewToChange.setText(valuee);
}
}
}
public void onClick(View view)
{
switch(view.getId())
{
case R.id.btn_activity1:
Intent myIntent1 = new Intent(getBaseContext(), firstactivity.class );
myIntent1.putExtra("key", "Hello! Activity 1");
startActivity(myIntent1);
break;
case R.id.btn_activity2:
Intent myIntent2 = new Intent(getBaseContext(), Activity2.class );
myIntent2.putExtra("key", "Hello! Activity 2");
startActivity(myIntent2);
break;
case R.id.btn_activity3:
Intent myIntent3 = new Intent(getBaseContext(), Activity3.class );
myIntent3.putExtra("key", "Hello! Activity 3");
startActivity(myIntent3);
break;
}
}
}
firstactivity.java
package com.jfdimarzio.application;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class firstactivity extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
String valuee = intent.getStringExtra("key");
final TextView textViewToChange = (TextView) findViewById(R.id.txtvw_activity1);
textViewToChange.setText(valuee);
}
}
Activity3.java
package com.jfdimarzio.application;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class Activity3 extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
String valuee = intent.getStringExtra("key");
final TextView textViewToChange = (TextView) findViewById(R.id.txtvw_activity1);
textViewToChange.setText(valuee);
}
}
Activity2.java
package com.jfdimarzio.application;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class Activity2 extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
String valuee = intent.getStringExtra("key");
final TextView textViewToChange = (TextView) findViewById(R.id.txtvw_activity1);
textViewToChange.setText(valuee);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:context="com.jfdimarzio.application.MainActivity">
<TextView
android:id="#+id/txtvw_activity1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="18dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/btn_activity1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="#+id/txtvw_first"
android:layout_marginTop="67dp"
android:onClick="onClick"
android:text="Activity 1" />
<Button
android:id="#+id/btn_activity2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="#+id/btn_activity1"
android:layout_marginTop="15dp"
android:onClick="onClick"
android:text="Activity 2" />
<Button
android:id="#+id/btn_activity3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="#+id/btn_activity2"
android:layout_marginTop="19dp"
android:onClick="onClick"
android:text="Activity 3" />
</RelativeLayout>
firstactivity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/txt_message"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/txtvw_activity1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:text="TextView" />
</RelativeLayout>
activity2.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
</RelativeLayout>

Looks like you have not declared all the activities in your Manifest File. Make sure you include all the activities in your Manifest.xml like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jfdimarzio.application">
<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/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".firstactivity">
</activity>
<activity android:name=".Activity2">
</activity>
<activity android:name=".Activity3">
</activity>
</application>

you just need to declare all the activites in the manifest file and name of the file in the
<activity android:name="...."></activity> tag must to similar to the name of your .java class file name.
Your entry of Activity2.java class is
<activity android:name=".activity2">
</activity>
It should be like this
<activity android:name=".Activity2">
</activity>

Blank Page after clicking button android eclipse?

I thought I did everything right but when I click the button I get a blank page instead of a page with a text. I want that the creation.xml comes up after clicking the button on the main xml. What did I wrong ?
My main activity xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:background="#drawable/creeper" >
<TextView
android:id="#+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/hello"
android:textSize="20sp" />
<Button
android:id="#+id/button1"
android:layout_width="200dp"
android:layout_height="60dp"
android:layout_below="#+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp"
android:textSize="20sp"
android:text="#string/button1_text" />
</RelativeLayout>
My main activity java
package com.berkcoop.deneme;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
Button button1, button2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent1 = new Intent(MainActivity.this, Creation.class);
startActivity(intent1);
}
});
}
My creation xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="Creations"
android:textSize="25sp"
android:gravity="center"/>
</LinearLayout>
manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.berkcoop.deneme"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.berkcoop.deneme.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.berkcoop.deneme.Creation"
android:label="#string/app_name" >
</activity>
</application>
</manifest>
and my creation java
package com.berkcoop.deneme;
import android.app.Activity;
public class Creation extends Activity{
#Override
public void setContentView(int layoutResID) {
// TODO Auto-generated method stub
super.setContentView(R.layout.creation);
}
}
Thank you..

Why do you override the setContentView method in your Creation class? Since you don't call it, it won't set the correct view.
You should call setContentView from onCreate, and as far as I know, there is no need to override setContentView.
Try this in Creation:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.creation);
}

android application error

my xml code is:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<com.google.android.maps.MapView
android:id="#+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:enable="true"
android:clickable="true"
android:apiKey="0THdCiXY7jaJ9Br1ZQahFE4Lu1xTv1hAiVJBvxQ"
/>
</RelativeLayout>
and manifest is:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.google.haha"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application android:icon="#drawable/icon" android:label="#string/app_name">
<uses-library android:name="com.google.android.maps"/>
<activity android:name=".NewActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
And this is main code:
package com.google.haha;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import android.app.Activity;
import android.os.Bundle;
public class NewActivity extends MapActivity {
/** Called when the activity is first created. */
MapController mControl;
GeoPoint GeoP;
MapView mapV;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapV=(MapView)findViewById(R.id.mapView);
mapV.displayZoomControls(true);
mapV.setBuiltInZoomControls(true);
double lat=21.00;
double longi=79.00;
GeoP=new GeoPoint((int)(lat*1E6),(int)(longi*1E6));
mControl=mapV.getController();
mControl.animateTo(GeoP);
mControl.setZoom(12);
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
Everything is fine but I am getting error an on line:
mapV=(MapView)findViewById(R.id.mapView);
id field is not recognised.

try to clean and rebuild your project, because that problem comes up sometimes on Eclipse IDE , the id of your MapView is not recognised on your R.java file :
Project ==> Clean ==> Choose your Project and Clic OK

<com.google.android.maps.MapView
android:id="#+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
**android:enable="true"** MUST BE android:enabled="true"
android:clickable="true"
android:apiKey="0THdCiXY7jaJ9Br1ZQahFE4Lu1xTv1hAiVJBvxQ"
/>
</RelativeLayout>