Untitled Page

1ST MAD LAB JAVA CODEpackage com.example.lab1;
import android.os.;
 import android.view.;
 import android.widget.;
 import androidx.appcompat.app.;
 import androidx.core.content.;
 import java.util.;
public class MainActivity extends AppCompatActivity {
int[] imgs = {R.drawable.a, R.drawable.b, R.drawable.c};
 Timer t = new Timer();
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
Button btn = findViewById(R.id.button1);
 View w = findViewById(R.id.wallView);
btn.setOnClickListener(v -> {
 t.scheduleAtFixedRate(new TimerTask() {
 Random r = new Random();
public void run() {
 int i = r.nextInt(imgs.length);
runOnUiThread(() ->
 w.setBackground(
 ContextCompat.getDrawable(getApplicationContext(), imgs[i])
 ));
 }
}, 0, 3000);
 });
 }
 }
1ST XML FILE
<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" android:background="@drawable/a" android:id="@+id/wallView" tools:context="MainActivity">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="CHANGING WALLPAPER APPLICATION" android:layout_marginTop="50sp" android:textSize="20sp" android:textStyle="bold" android:background="@color/black" android:textColor="@color/white" android:layout_centerHorizontal="true" android:id="@+id/text1"/>
<Button android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="350sp" android:layout_centerHorizontal="true" android:layout_centerInParent="true" android:text="CLICK HERE TO CHANGE WALLPAPER" android:textSize="25sp" android:background="@color/black" android:layout_marginLeft="50sp" android:layout_marginRight="50sp" android:id="@+id/button1"/>
</RelativeLayout>


2ND MAD LAB JAVA CODE
package com.example.hello;
import android.annotation.SuppressLint;
 import android.os.Bundle;
 import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
TextView a;
 boolean b;
@SuppressLint("MissingInflatedId")
 @Override
 protected void onCreate(Bundle c) {
 super.onCreate(c);
 setContentView(R.layout.activity_main);
a = findViewById(R.id.counter);
findViewById(R.id.startbtn).setOnClickListener(v -> {
 b = true;
new Thread(() -> {
 int d = 0;
while (b) {
 int e = d++;
 a.post(() -> a.setText(String.valueOf(e)));
try {
 Thread.sleep(500);
 } catch (InterruptedException ignored) {}
 }
}).start();
 });
findViewById(R.id.stopbtn).setOnClickListener(v -> b = false);
}
 }
2ND XML FILE
<?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" tools:context="MainActivity" android:orientation="vertical" android:background="#0C0A10">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Counter Application" android:textAllCaps="true" android:layout_marginLeft="40dp" android:layout_marginTop="50dp" android:layout_marginBottom="40dp" android:textSize="30dp" android:textColor="#109AD9" />
<TextView android:id="@+id/counter" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Counter Value" android:layout_marginLeft="120dp" android:layout_marginTop="50dp" android:layout_marginBottom="40dp" android:textSize="30dp" android:textColor="#B507E0" />
<Button android:id="@+id/startbtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="START" android:layout_marginLeft="145dp" android:layout_marginTop="20dp" android:layout_marginBottom="40dp" android:textSize="30dp" android:textColor="#0B0A0D" android:background="#EDB308" android:padding="10dp"/>
<Button android:id="@+id/stopbtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="STOP" android:layout_marginLeft="150dp" android:layout_marginTop="20dp" android:layout_marginBottom="40dp" android:textSize="30dp" android:textColor="#0B0A0D" android:background="#EDB308" android:padding="10dp"/>
</LinearLayout>

3 MAD PROGRAM JAVA CODE
package com.example.lab3;
import android.os.;
 import android.speech.tts.;
 import android.widget.;
 import androidx.appcompat.app.;
 import java.util.*;
public class MainActivity extends AppCompatActivity {
EditText t;
 Button b;
 TextToSpeech s;
@Override
 protected void onCreate(Bundle c) {
 super.onCreate(c);
 setContentView(R.layout.activity_main);
t = findViewById(R.id.editText);
 b = findViewById(R.id.btnSpeak);
s = new TextToSpeech(getApplicationContext(), set -> {
 s.setLanguage(Locale.US);
 });
b.setOnClickListener(v -> {
 String x = t.getText().toString();
 s.speak(x, TextToSpeech.QUEUE_FLUSH, null, null);
 });
}
 }
3RD XML FILE
<?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:padding="16dp" android:gravity="center" android:orientation="vertical">
<EditText android:id="@+id/editText" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="48dp" android:padding="12dp" android:hint="Enter text here" android:textSize="18sp"/>
<Button android:id="@+id/btnSpeak" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Convert Text to Speech" android:layout_marginTop="20dp"/>
</LinearLayout> 

4)LOGIN / SIGNUP APP
MainActivity.java
package com.example.labbb4;
import android.content.;
 import android.os.;
 import android.widget.;
 import androidx.appcompat.app.;
public class MainActivity extends AppCompatActivity {
EditText u, p;
 Button up, in;
 String su = "", sp = "";
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
u = findViewById(R.id.etUsername);
 p = findViewById(R.id.etPassword);
 up = findViewById(R.id.btnSignUp);
 in = findViewById(R.id.btnSignIn);
up.setOnClickListener(v -> {
 String un = u.getText().toString();
 String pw = p.getText().toString();
if (pwCheck(pw)) {
 su = un;
 sp = pw;
 Toast.makeText(this, "Sign Up Successful!", Toast.LENGTH_SHORT).show();
 u.setText("");
 p.setText("");
 }
 });
in.setOnClickListener(v -> {
 String un = u.getText().toString();
 String pw = p.getText().toString();
if (un.equals(su) && pw.equals(sp)) {
 Toast.makeText(this, "Successful Login", Toast.LENGTH_SHORT).show();
 startActivity(new Intent(this, NextActivity.class));
 finish();
 } else {
 Toast.makeText(this, "Login Failed", Toast.LENGTH_SHORT).show();
 }
 });
 }
boolean pwCheck(String pw) {
 return pw.length() >= 8 &&
 pw.matches(".[A-Z].") &&
 pw.matches(".[a-z].") &&
 pw.matches(".\d.") &&
 pw.matches(".[!@#$%^&(),.?":{}|<>].*");
 }
 }
NextActivity.java
package com.example.labbb4;
import android.os.;
 import android.widget.;
 import androidx.appcompat.app.*;
public class NextActivity extends AppCompatActivity {
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_next);
TextView t = findViewById(R.id.tvSuccessMessage);
 t.setText("Successful Login!");
}
 }
AndroidManifest.xml
(add this line inside application)
<activity android:name=".NextActivity"/>
Full 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">
<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.Lab1" tools:targetApi="31">
<activity android:name=".NextActivity"/>
<activity android:name=".MainActivity" android:exported="true" tools:ignore="MissingClass">
<intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
activity_next.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:padding="16dp" android:orientation="vertical" android:gravity="center">
<TextView android:id="@+id/tvSuccessMessage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Welcome!" android:textSize="24sp" android:textColor="@android:color/holo_green_dark" />
</LinearLayout>
activity_main.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" android:padding="16dp">
<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical">
<EditText android:id="@+id/etUsername" android:layout_width="match_parent" android:layout_height="59dp" android:hint="Username" android:inputType="text" />
<EditText android:id="@+id/etPassword" android:layout_width="match_parent" android:layout_height="68dp" android:hint="Password" android:inputType="textPassword" />
<Button android:id="@+id/btnSignUp" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Sign Up" />
<Button android:id="@+id/btnSignIn" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Sign In" />
<TextView android:id="@+id/textView" android:layout_width="match_parent" android:layout_height="wrap_content" android:textColor="@android:color/holo_green_dark" android:textSize="18sp" android:visibility="gone" />
</LinearLayout> </RelativeLayout>

5)SEND SMS APP
JAVA FILE
package com.example.lab5;
import android.Manifest;
 import android.os.;
 import android.telephony.;
 import android.widget.;
 import androidx.appcompat.app.;
 import androidx.core.app.*;
public class MainActivity extends AppCompatActivity {
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
ActivityCompat.requestPermissions(
 this,
 new String[]{Manifest.permission.SEND_SMS},
 1
 );
findViewById(R.id.buttonSendSMS).setOnClickListener(v -> {
String n = "1234567890";
 String m = "Hello from app!";
SmsManager.getDefault().sendTextMessage(n, null, m, null, null);
Toast.makeText(this, "SMS Sent!", Toast.LENGTH_SHORT).show();
});
}
 }
AndroidManifest.xml
(Add this permission)
<uses-permission android:name="android.permission.SEND_SMS"/>
(Full 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">
<uses-feature android:name="android.hardware.telephony" android:required="false" />
<uses-permission android:name="android.permission.SEND_SMS"/>
<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.Lab5" 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>
activity_main.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" android:padding="16dp" android:gravity="center">
<Button android:id="@+id/buttonSendSMS" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Send SMS" android:layout_gravity="center" android:layout_marginTop="100dp"/>
</LinearLayout> 

6)PARSING XML & JSON
MAINACTIVITY.java
package com.example.lab6mad;
import android.os.Bundle;
 import android.widget.;
 import androidx.appcompat.app.AppCompatActivity;
 import org.json.;
 import org.xmlpull.v1.;
 import java.io.;
public class MainActivity extends AppCompatActivity {
TextView xml, json;
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
xml = findViewById(R.id.xmlData);
 json = findViewById(R.id.jsonData);
findViewById(R.id.btnParseXML).setOnClickListener(v -> parseXML());
 findViewById(R.id.btnParseJSON).setOnClickListener(v -> parseJSON());
 }
void parseXML() {
 try {
InputStream i = getResources().openRawResource(R.raw.city_data);
XmlPullParser x = XmlPullParserFactory
 .newInstance()
 .newPullParser();
x.setInput(i, null);
x.nextTag(); x.next(); String n = x.getText();
 x.nextTag(); x.next(); String la = x.getText();
 x.nextTag(); x.next(); String lo = x.getText();
 x.nextTag(); x.next(); String te = x.getText();
 x.nextTag(); x.next(); String hu = x.getText();
String r =
 "name: " + n +
 "\nlat: " + la +
 "\nlon: " + lo +
 "\ntemp: " + te +
 "\nhumid: " + hu;
xml.setText(r);
} catch (Exception e) {
 xml.setText("XML Error");
 }
 }
void parseJSON() {
try (InputStream i = getResources()
 .openRawResource(R.raw.city_data_json)) {
byte[] b = new byte[i.available()];
 i.read(b);
JSONObject o = new JSONObject(new String(b));
String r =
 "name: " + o.getString("name") +
 "\nlat: " + o.getDouble("latitude") +
 "\nlon: " + o.getDouble("longitude") +
 "\ntemp: " + o.getDouble("temperature") +
 "\nhumid: " + o.getInt("humidity");
json.setText(r);
} catch (Exception e) {
 json.setText("JSON Error");
 }
}
 }

AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.lab6mad">
<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.LAB6MAD">
<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>

activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
<LinearLayout style="?android:attr/buttonBarStyle" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center" android:padding="10dp">
 </LinearLayout>
<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal">
<TextView android:id="@+id/xmlData" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="XML Data" android:padding="10dp" android:background="#FFEBEE" />
<TextView android:id="@+id/jsonData" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="JSON Data" android:padding="10dp" android:background="#E3F2FD" />
</LinearLayout>
<Button android:id="@+id/btnParseXML" style="?android:attr/buttonBarButtonStyle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Parse XML" />
<Button android:id="@+id/btnParseJSON" style="?android:attr/buttonBarButtonStyle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="16dp" android:text="Parse JSON" />
</LinearLayout>

city_data.xml
<city> <name>New York</name> <latitude>40.7128</latitude> <longitude>-74.0060</longitude> <temperature>22.5</temperature> <humidity>60</humidity> </city>

city_data_json.json
{
 "name": "New York",
 "latitude": 40.7128,
 "longitude": -74.0060,
 "temperature": 22.5,
 "humidity": 60
 }

7)DIALER — CALL & SAVE CONTACT
MainActivity.java
package com.example.madlab7;
import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.ContactsContract;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
EditText e;
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
e = findViewById(R.id.editTextPhone);
 }
public void d(View v) {
 e.append(((Button) v).getText());
 }
public void call(View v) {
 String n = e.getText().toString();
 Intent i = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + n));
 startActivity(i);
 }
public void save(View v) {
 String n = e.getText().toString();
 Intent i = new Intent(Intent.ACTION_INSERT);
 i.setType(ContactsContract.RawContacts.CONTENT_TYPE);
 i.putExtra(ContactsContract.Intents.Insert.PHONE, n);
 startActivity(i);
 }
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp">
<EditText android:id="@+id/editTextPhone" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Enter phone number" android:inputType="phone" android:textSize="24sp" />
<GridLayout android:layout_width="389dp" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:columnCount="3">
<Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="1" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="2" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="3" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="4" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="5" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="6" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="7" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="8" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="9" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="*" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="0" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_columnWeight="1" android:onClick="d" android:text="#" /> </GridLayout>
<Button android:text="CALL" android:onClick="call" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="16dp" />
<Button android:text="SAVE" android:onClick="save" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="8dp" />
</LinearLayout>
(Remember — every keypad button must include)
android:onClick="d"
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.madlab7">
<uses-feature android:name="android.hardware.telephony" android:required="false" />
<uses-permission android:name="android.permission.CALL_PHONE" /> <uses-permission android:name="android.permission.WRITE_CONTACTS" /> <uses-permission android:name="android.permission.READ_CONTACTS" />
<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.MADLAB7" tools:targetApi="31">
<activity android:name=".MainActivity" android:exported="true" tools:ignore="MissingClass">
<intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
(Additional required lines — already included above)
<uses-feature android:name="android.hardware.telephony" android:required="false" /> <uses-permission android:name="android.permission.CALL_PHONE" /> <uses-permission android:name="android.permission.WRITE_CONTACTS" /> <uses-permission android:name="android.permission.READ_CONTACTS" />

8)MEDICINE REMAINDER APP
MainActivity.java
package com.example.lab9;
import android.os.Bundle;
 import android.widget.;
 import androidx.appcompat.app.AppCompatActivity;
 import java.util.;
public class MainActivity extends AppCompatActivity {
EditText n, d;
 Spinner s;
 TextView o;
List<M> l = new ArrayList<>();
String[] t = {"Morning", "Afternoon", "Evening", "Night"};
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
n = findViewById(R.id.medicineName);
 d = findViewById(R.id.medicineDate);
 s = findViewById(R.id.timeOfDay);
 o = findViewById(R.id.outputText);
s.setAdapter(
 new ArrayAdapter<>(
 this,
 android.R.layout.simple_spinner_dropdown_item,
 t
 )
 );
findViewById(R.id.saveBtn).setOnClickListener(v -> {
String x = n.getText().toString();
 String y = d.getText().toString();
 String z = s.getSelectedItem().toString();
l.add(new M(x, y, z));
});
findViewById(R.id.checkAlarmBtn).setOnClickListener(v -> showMeds());
}
String getSlot() {
int h = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
return h < 12 ? "Morning"
 : h < 17 ? "Afternoon"
 : h < 21 ? "Evening"
 : "Night";
}
void showMeds() {
String today = java.time.LocalDate.now().toString();
 String tm = getSlot();
StringBuilder b = new StringBuilder(tm + " " + today + "\nTake:\n");
boolean found = false;
for (M m : l) {
 if (m.d.equals(today) && m.t.equals(tm)) {
 b.append(m.n).append("\n");
 found = true;
 }
 }
if (found)
 o.setText(b.toString());
 else
 o.setText("No medicine scheduled.");
}
static class M {
String n, d, t;
M(String a, String b, String c) {
 n = a;
 d = b;
 t = c;
 }
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="20dp" android:layout_width="match_parent" android:layout_height="match_parent">
<EditText android:id="@+id/medicineName" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="medicine_name" android:layout_marginTop="58dp" android:minHeight="48dp" />
<EditText android:id="@+id/medicineDate" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="date_yyyy_mm_dd" android:minHeight="48dp" />
<Spinner android:id="@+id/timeOfDay" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="48dp" />
<Button android:id="@+id/saveBtn" android:text="save_medicine" android:layout_width="match_parent" android:layout_height="wrap_content" />
<Button android:id="@+id/checkAlarmBtn" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="check_alarm" />
<TextView android:id="@+id/outputText" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:text="" android:textSize="16sp" />
</LinearLayout>

9)MEDIA PLAYER APP
activity_main.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" android:padding="24dp" android:background="#FAFAFA">
<TextView android:id="@+id/titleText" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="MEDIA PLAYER APPLICATION" android:textStyle="bold" android:textSize="20sp" android:layout_centerHorizontal="true" android:layout_marginTop="16dp" />
<TextView android:id="@+id/audioName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Audio Name" android:layout_below="@id/titleText" android:layout_centerHorizontal="true" android:layout_marginTop="40dp" />
<SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/audioName" android:layout_marginTop="20dp" android:layout_marginStart="16dp" android:layout_marginEnd="16dp" />
<LinearLayout android:id="@+id/buttonLayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/seekBar" android:layout_marginTop="40dp" android:gravity="center" android:orientation="horizontal" android:weightSum="4">
<Button android:id="@+id/btnBackward" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="⏪" android:textSize="24sp" /> <Button android:id="@+id/btnPlay" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="▶" android:textSize="24sp" /> <Button android:id="@+id/btnPause" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="⏸" android:textSize="24sp" /> <Button android:id="@+id/btnForward" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="⏩" android:textSize="24sp" /> </LinearLayout> </RelativeLayout>

MainActivity.java
package com.example.lab9;
import android.media.MediaPlayer;
 import android.os.Bundle;
 import android.os.Handler;
 import android.widget.Button;
 import android.widget.SeekBar;
 import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private MediaPlayer mediaPlayer;
 private SeekBar seekBar;
 private Handler handler = new Handler();
 private Runnable updateSeekBar;
@Override
 protected void onCreate(Bundle c) {
 super.onCreate(c);
 setContentView(R.layout.activity_main);
seekBar = findViewById(R.id.seekBar);
 Button play = findViewById(R.id.btnPlay);
 Button pause = findViewById(R.id.btnPause);
 Button forward = findViewById(R.id.btnForward);
 Button backward = findViewById(R.id.btnBackward);
mediaPlayer = MediaPlayer.create(this, R.raw.sample_audio);
 seekBar.setMax(mediaPlayer.getDuration());
updateSeekBar = () -> {
 seekBar.setProgress(mediaPlayer.getCurrentPosition());
 handler.postDelayed(updateSeekBar, 1000);
 };
play.setOnClickListener(v -> {
 mediaPlayer.start();
 handler.postDelayed(updateSeekBar, 0);
 });
pause.setOnClickListener(v -> {
 if (mediaPlayer.isPlaying()) mediaPlayer.pause();
 });
forward.setOnClickListener(v -> {
 int pos = mediaPlayer.getCurrentPosition() + 5000;
 mediaPlayer.seekTo(Math.min(pos, mediaPlayer.getDuration()));
 });
backward.setOnClickListener(v -> {
 int pos = mediaPlayer.getCurrentPosition() - 5000;
 mediaPlayer.seekTo(Math.max(pos, 0));
 });
}
}

10)EMI CALCULATOR APP
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="16dp" android:layout_width="match_parent" android:layout_height="match_parent">
<EditText android:id="@+id/etPrincipal" android:hint="Principal amount" android:inputType="numberDecimal" android:layout_width="match_parent" android:layout_height="wrap_content" />
<EditText android:id="@+id/etRate" android:hint="Annual Interest Rate (%)" android:inputType="numberDecimal" android:layout_width="match_parent" android:layout_height="wrap_content" />
<EditText android:id="@+id/etTenure" android:hint="Tenure (months)" android:inputType="number" android:layout_width="match_parent" android:layout_height="wrap_content" />
<EditText android:id="@+id/etDownPayment" android:hint="Down Payment" android:inputType="numberDecimal" android:layout_width="match_parent" android:layout_height="wrap_content" />
<Button android:id="@+id/btnCalculate" android:text="Calculate EMI" android:layout_width="match_parent" android:layout_height="wrap_content" />
<TextView android:id="@+id/tvResult" android:textSize="18sp" android:paddingTop="16dp" android:layout_width="match_parent" android:layout_height="wrap_content" />
</LinearLayout>

MainActivity.java
package com.example.lab10;
import android.os.Bundle;
 import android.widget.*;
 import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
EditText pri, rate, time, dp;
 Button calc;
 TextView res;
@Override
 protected void onCreate(Bundle b) {
 super.onCreate(b);
 setContentView(R.layout.activity_main);
pri = findViewById(R.id.etPrincipal);
 rate = findViewById(R.id.etRate);
 time = findViewById(R.id.etTenure);
 dp = findViewById(R.id.etDownPayment);
 calc = findViewById(R.id.btnCalculate);
 res = findViewById(R.id.tvResult);
calc.setOnClickListener(v -> {
double P = Double.parseDouble(pri.getText().toString());
 double R = Double.parseDouble(rate.getText().toString());
 int N = Integer.parseInt(time.getText().toString());
 double Dp = Double.parseDouble(dp.getText().toString());
double principal = P - Dp;
 double r = R / (12 * 100);
double emi = (principal * r * Math.pow(1 + r, N)) /
 (Math.pow(1 + r, N) - 1);
res.setText("EMI: " + String.format("%.2f", emi));
});
}
}