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1ST MAD LAB JAVA CODE

package 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>

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>

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>

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)

Full file:

<?xml version="1.0" encoding="utf-8"?>

<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>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

</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},

);

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"?>

<uses-feature android:name="android.hardware.telephony" android:required="false" />

<uses-permission android:name="android.permission.SEND_SMS"/>

<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>

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

<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>

</LinearLayout>

</LinearLayout>

city_data.xml

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>

(Remember — every keypad button must include)

android:onClick="d"

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<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" />

<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,

)

);

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>

9)MEDIA PLAYER APP

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

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>

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));

});

}