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Trying to create a Journal in Android Studio but App Crashes

Upon opening the first activity of my app in Android Studio, app opens fine. I copied and pasted the same main activity code to open the journal activity, and changed the variable names that were needed, but app crashes upon opening the journal up.
here is the code for opening up the journal:
public class Activity2 extends AppCompatActivity {
private Button buttonJournal;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_2);
buttonJournal = (Button) findViewById(R.id.buttonJournal);
buttonJournal.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openJournalActivity();
}
});
}
public void openJournalActivity () {
Intent intent = new Intent(this, JournalActivity.class);
startActivity(intent);
}
}
The journal activity I am opening up: (This might be my problem)
public class JournalActivity extends AppCompatActivity {
static ArrayList<String> notes = new ArrayList<>();
static ArrayAdapter arrayAdapter;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.add_note_menu, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
super.onOptionsItemSelected(item);
if(item.getItemId() == R.id.add_note){
Intent intent = new Intent(getApplicationContext(), NoteEditorActivity.class);
startActivity(intent);
return true;
}
return false;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_journal);
ListView listView = findViewById(R.id.listView);
SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("com.example.anxty", Context.MODE_PRIVATE);
HashSet<String> set = (HashSet<String>) sharedPreferences.getStringSet("notes", null);
if(set == null) {
notes.add("Example note");
} else{
notes = new ArrayList(set);
}
arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, notes);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(), NoteEditorActivity.class);
intent.putExtra("noteId",i);
startActivity(intent);
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
final int itemToDelete = i;
new AlertDialog.Builder(getApplicationContext())
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Are you sure?")
.setMessage("Do you want to delete this note")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int i) {
notes.remove(itemToDelete);
arrayAdapter.notifyDataSetChanged();
SharedPreferences sharedPreferences = getApplicationContext().getSharedPreferences("com.example.anxty", Context.MODE_PRIVATE);
HashSet<String> set = new HashSet(JournalActivity.notes);
sharedPreferences.edit().putStringSet("notes",set).apply();
}
})
.setNegativeButton("No", null)
.show();
return true;
}
});
}
}
LogCat when app crashes:
-06-11 11:55:55.744 6677-6677/com.example.anxty E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.anxty, PID: 6677
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.anxty/com.example.anxty.JournalActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5293)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at com.example.anxty.JournalActivity.onCreate(JournalActivity.java:79)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2280)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392) 
at android.app.ActivityThread.access$800(ActivityThread.java:153) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5293) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:dist="http://schemas.android.com/apk/distribution"
package="com.example.anxty">
<dist:module dist:instant="true" />
<application
android:allowBackup="true"
android:icon="#mipmap/anxty_logo"
android:label="#string/app_name"
android:roundIcon="#mipmap/anxty_logo"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".NoteEditorActivity"></activity>
<activity android:name=".JournalActivity" />
<activity
android:name=".ui.login.LoginActivity"
android:label="#string/title_activity_login" />
<activity
android:name=".Activity2"
android:label="#string/title_activity_2"
android:theme="#style/AppTheme.NoActionBar" /> <!-- Main Activity -->
<activity
android:name=".MainActivity"
android:screenOrientation="portrait" /> <!-- Splash Screen Activity -->
<activity
android:name=".SplashScreen"
android:noHistory="true"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Error running 'RegistrationActivity': The activity must be exported or contain an intent-filter

I can't run my registrationActivity as it gives me the error:
The activity must be exported or contain an intent-filter
And I don't know how to solve, what should I put in my android manifest?
Also, I'm getting
java.lang.NullPointerException with the if below:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_registration);
mAuth = FirebaseAuth.getInstance();
firebaseAuStateListener = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null){
Intent intent = new Intent(RegistrationActivity.this, MainActivity.class);
startActivity (intent);
finish();
return;
}
}
}
}

put it in your androidmanifest.xml
inside the application tag
<activity
android:name=".YOURACTIVTYNAME">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Why is my intent not able to recognize my activity [duplicate]

This question already has answers here:
Why does my Android app crash with a NullPointerException when initializing a variable with findViewById(R.id.******) at the beginning of the class?
(9 answers)
Closed 6 years ago.
new Android Dev here. Okay so I made a simple intent to take me to another activity. The problem is that it is not able to take me to that specific activity (but it does open other activities just fine.). Here is the error it is giving me:
FATAL EXCEPTION: main
Process: com.shahrukhraza.app, PID: 5628
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.shahrukhraza.app/com.shahrukhraza.app.otherAppActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:68)
at android.support.v7.app.AppCompatDelegateImplV7.<init>(AppCompatDelegateImplV7.java:146)
at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:28)
at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:41)
at android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:29)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:188)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:172)
at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:512)
at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:184)
at com.shahrukhraza.app.otherAppActivity.<init>(otherAppActivity.java:14)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1067)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2317)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
And this is my MainActivity.java:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_other_app);
Button b1 = (Button) findViewById(R.id.btn1);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, otherAppActivity.class);
startActivity(intent);
}
});
}
}
And this is the java class that is causing problems :
public class otherAppActivity extends AppCompatActivity {
EditText eText1 = (EditText) findViewById(R.id.eText1);
EditText eText2 = (EditText) findViewById(R.id.eText2);
Button btn = (Button) findViewById(R.id.button);
TextView result = (TextView)findViewById(R.id.textView);
double n1,n2,sum;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.other_activity_app);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
n1 = Double.parseDouble(eText1.getText().toString());
n2 = Double.parseDouble(eText2.getText().toString());
sum = n1 +n2;
result.setText(Double.toString(sum));
}
});
}
}

You should initilize the button and all the stuff in OnCreate or they will be null.
EditText eText1, eText2;
TextView result;
double n1,n2,sum;
Button btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.);
eText1 = (EditText) findViewById(R.id.eText1);
eText2 = (EditText) findViewById(R.id.eText2);
btn = (Button) findViewById(R.id.button);
result = (TextView)findViewById(R.id.textView);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
n1 = Double.parseDouble(eText1.getText().toString());
n2 = Double.parseDouble(eText2.getText().toString());
sum = n1 +n2;
result.setText(Double.toString(sum));
}
});
}

Is your otherAppActivity.class in your manifest file as a activity?
Like this
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".PromotionMain"
android:label="Promotions"
android:theme="#style/AppTheme.NoActionBar"
>
</activity>
<activity
android:name=".MyWebViewMain"
android:label="MyWebView"
android:theme="#style/AppTheme.NoActionBar"
>
</activity>
if the class is not set up in your Manifest file like this then the class will never load from a intent.
You intent is set up right and should work as far as I can tell

in the otherActivity, in the setContentView you only have R.layout. without specifying the layout id. This might cause the error

NFC app crashing on enableForegroundDispatch

I am trying to get NFC foreground dispatch to work in my app using the tutorials
here and here. From what I can deduce all other functions seem to be working a it is just the NFC forground dispatch system that isn't working.
In my onCreate, I check NFC exists and initialise pending Intents and filters and get the NFC adapter:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Set some stuff
mTV = (TextView) findViewById(R.id.textView);
mButt = (Button) findViewById(R.id.button);
//mNfcAd = NfcAdapter.getDefaultAdapter(this);
//Init elsewhere
getAdapter();
//Hide button until its needed
mButt.setVisibility(View.INVISIBLE);
//Make sure NFC actually exists.....
if (mNfcAd == null) {
//Not going to work without NFC
Toast.makeText(this, "This device does not support NFC\nGet used to the pen and paper for now :/", Toast.LENGTH_LONG).show();
finish();
return;
}
Intent nfcIntent = new Intent(this, getClass());
nfcIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
nfcPendingIntent =
PendingIntent.getActivity(this, 0, nfcIntent, 0);
IntentFilter tagIntentFilter =
new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
try {
tagIntentFilter.addDataType("text/plain");
intentFiltersArray = new IntentFilter[]{tagIntentFilter};
}
catch (Throwable t) {
t.printStackTrace();
}
//Init the prefs
initPrefs();
}
public void initPrefs() {
prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
}
private NfcAdapter getAdapter(){
if(mNfcAd ==null){
NfcManager manager = (NfcManager) getSystemService(NFC_SERVICE);
mNfcAd = manager.getDefaultAdapter();
}
return mNfcAd;
}
I then go on to check NFC is enabled (if not display a button that shows NFC settings) as well as checking if the app is in its first run. At the end of onResume(), I (attempt to) enable Foreground Dispatch for the adapter.
protected void onResume() {
super.onResume();
//Define the mButt action
mButt.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent dialogIntent = new Intent(Settings.ACTION_NFC_SETTINGS);
dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(dialogIntent);
}
});
//If NFC exists, check if its turned on
if (!mNfcAd.isEnabled()) {
Toast.makeText(this, "You have NFC, but you haven't enabled it...", Toast.LENGTH_LONG).show();
mTV.setText("NFC not enabled");
mButt.setVisibility(View.VISIBLE);
}
//Check if first run
if (prefs.getInt("firstTime", 1) == 1 ||
prefs.getString("fullName", null) == null ||
prefs.getString("house", null) == null) {
Intent intent = new Intent(this, First_Run.class);
startActivity(intent);
prefs.edit().putInt("firstTime", 0);
prefs.edit().putString("fullName", getIntent().getExtras().getString("fullName"));
prefs.edit().putString("house", getIntent().getExtras().getString("house"));
prefs.edit().apply();
}
getAdapter().enableForegroundDispatch(this, nfcPendingIntent, intentFiltersArray, null);
handleIntent(getIntent());
}
The error is:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.nfc.NfcAdapter.enableForegroundDispatch(android.app.Activity, android.app.PendingIntent, android.content.IntentFilter[], java.lang.String[][])' on a null object reference
However, all the arguments seem to be initialised;
It is being called in onResume, so the activity context is created;
nfcPendingIntent and intentFiltersArray are initialised in onCreate;
I do not have a techlist so I use null as the final argument;
The adapter itself is initialised in getAdapter.
I am currently combing through other tutorials to see the different methods that can be used, however I would really like to get this fixed.
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
<uses-permission android:name="android.permission.NFC" />
<application
android:fullBackupContent="false"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name=".MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" />
</intent-filter>
</activity>
<activity
android:name=".First_Run"
android:label="#string/title_activity_first__run">
</activity>
</application>

Try creating your NfcAdapter object like below.
NfcAdapter mNfcAdapter = NfcAdapter.getDefaultAdapter(this);

How to add a class to AndroidManifest.xml file in Android Studio? [duplicate]

This question already has answers here:
Unfortunately MyApp has stopped. How can I solve this?
(23 answers)
Closed 5 years ago.
I switched over from eclipse to android studio and I'm trying to add an activity to my manifest file, I dont know the code I'm supposed to use and my app keeps crashing heres the code from my manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="penis.jason.payday" >
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".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="settings"
android:label="Pay Day!!">
</activity>
<activity android:name="statistics"
android:label="Pay Day!!">
</activity>
</application>
what i have it doing is when the user pushes the settings button than it takes the to that class and new xml. heres the code i used to send the intent
Settings.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent GoToSettings = new Intent(getApplicationContext(), settings.class);
startActivity(GoToSettings);
finish();
}
});
heres my logcat
08-24 10:41:52.098 21750-21750/penis.jason.payday E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: penis.jason.payday, PID: 21750
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{penis.jason.payday/penis.jason.payday.settings}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2259)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$900(ActivityThread.java:169)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5487)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.app.Activity.findViewById(Activity.java:1986)
at penis.jason.payday.settings.<init>(settings.java:23)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1208)
at android.app.Instrumentation.newActivity(Instrumentation.java:1067)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2250)
this is the whole settings class
package penis.jason.payday;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.CheckBox;
import java.util.Calendar;
#SuppressWarnings("unused")
public class settings extends Activity {
boolean FullScreen;
Button SaveAndExit = (Button) findViewById(R.id.SaveAndExit);
Button Save = (Button) findViewById(R.id.Save);
Button Cls = (Button) findViewById(R.id.Cls);
CheckBox FullScreenOnOff = (CheckBox) findViewById(R.id.fullScreen);
CheckBox SaveWarningOnOff = (CheckBox) findViewById(R.id.SaveWarningOnOff);
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int month= cal.get(Calendar.MONTH)+1;
int day = cal.get(Calendar.DATE);
String FullDate = (" "+month+"/"+day+"/"+year);
String Date=(String.valueOf(FullDate));
#Override
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.settings);
FullScreen = getSharedPreferences("Settings",MODE_PRIVATE).getBoolean("FullScreen",false);
if(FullScreen==true){
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.settings);
}
SaveAndExit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent GoToMain = new Intent(getApplicationContext(), MainActivity.class);
startActivity(GoToMain);
finish();
}
});
Save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
Cls.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
if(FullScreenOnOff.isChecked()){
FullScreen = true;
SharedPreferences FullScreenSave = getSharedPreferences("Settings", Context.MODE_PRIVATE);
SharedPreferences.Editor FullScreenE = FullScreenSave.edit();
FullScreenE.putBoolean("FullScreen", FullScreen);
FullScreenE.commit();
}
}
}
_______UPDATE______
i found the problem!
i had to change the way i declared my button varables to this
boolean FullScreen;
Button SaveAndExit,Save,Cls;
CheckBox FullScreenOnOff,SaveWarningOnOff;
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int month= cal.get(Calendar.MONTH)+1;
int day = cal.get(Calendar.DATE);
String FullDate = (" "+month+"/"+day+"/"+year);
String Date=(String.valueOf(FullDate));
#Override
protected void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.settings);
FullScreen = getSharedPreferences("Settings",MODE_PRIVATE).getBoolean("FullScreen",false);
if(FullScreen==true){
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.settings);
}
SaveAndExit = (Button) findViewById(R.id.SaveAndExit);
Save = (Button) findViewById(R.id.Save);
Cls = (Button) findViewById(R.id.Cls);
FullScreenOnOff = (CheckBox) findViewById(R.id.fullScreen);
SaveWarningOnOff = (CheckBox) findViewById(R.id.SaveWarningOnOff);
}

From the looks of your class name it should be as below, case is important.
<activity android:name=".Settings"
android:label="Pay Day!!">
</activity>
<activity android:name=".Statistics"
android:label="Pay Day!!">
</activity>

Declare <uses-sdk android:minSdkVersion="minimum_integer_value" android:targetSdkVersion="your_target_integer_value" /> in your manifest. May be your trying to run it on lower version using API's of higher level