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Practical No 17: Activity - Main Maketext Length - Long D

The document contains multiple Android application examples demonstrating various functionalities, including activity lifecycle management, explicit and implicit intents, and sensor usage. Each example includes Java code for the MainActivity and corresponding XML layout files. The applications showcase user interactions through buttons and display sensor information on the screen.

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tambolianushka6
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31 views6 pages

Practical No 17: Activity - Main Maketext Length - Long D

The document contains multiple Android application examples demonstrating various functionalities, including activity lifecycle management, explicit and implicit intents, and sensor usage. Each example includes Java code for the MainActivity and corresponding XML layout files. The applications showcase user interactions through buttons and display sensor information on the screen.

Uploaded by

tambolianushka6
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Practical no 17

MainActivity.java

package com.example.pract17; import


android.os.Bundle; import
android.util.Log; import
android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity; public class
MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState)
{ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
Toast.makeText(this,"On Create", Toast.LENGTH_LONG).show();
Log.d("Activity Lifecycle", "Activity is created");}
@Override
protected void onStart() { super.onStart();
Toast.makeText(this,"On Start", Toast.LENGTH_LONG).show();}
@Override
protected void onResume() {super.onResume();
Toast.makeText(this,"On Resume", Toast.LENGTH_LONG).show();}
@Override
protected void onPause() {super.onPause();
Toast.makeText(this,"On Pause", Toast.LENGTH_LONG).show();}
@Override
protected void onStop() {super.onStop();
Toast.makeText(this,"On Stop", Toast.LENGTH_LONG).show();}
@Override
protected void onRestart() {super.onRestart();
Toast.makeText(this,"On Restart", Toast.LENGTH_LONG).show();}
@Override
protected void onDestroy() {super.onDestroy();
Toast.makeText(this,"On Destroy", Toast.LENGTH_LONG).show();}}

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">
<TextView
android:id="@+id/textView" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Manifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.pract17">
<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.AppCompat.Light.NoActionBar">
<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>
Practical no 18
MainActivity.java

package com.example.android;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
Button explicit_btn, implicit_btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
explicit_btn = findViewById(R.id.explicit_btn);
implicit_btn = findViewById(R.id.implicit_btn);
// Implement OnClick event for Explicit Intent
explicit_btn.setOnClickListener(v -> {
Intent intent = new Intent(MainActivity.this,
ActivitySecond.class);
startActivity(intent);});
// Implement OnClick event for Implicit Intent
implicit_btn.setOnClickListener(v -> { When we click on button explicit intent example the new
screen is open shows the message the second activity.
Intent intent = new
Intent(Intent.ACTION_VIEW,
Uri.parse("https://www.abhiandroid.com"));
startActivity(intent);
});}}

activity_main.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:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
android:paddingBottom="16dp"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="If you click on Explicit example we will navigate to
second activity within App and if you click on Implicit example
Google Homepage will open in Browser"
android:clickable="false"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="42dp"
android:background="#3e7d02"
android:textColor="#ffffff"
tools:ignore="HardcodedText,VisualLintLongText,VisualLintBounds"
/> <Button
android:id="@+id/explicit_btn"
android:text="Open Second Activity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/textView2"
android:layout_centerHorizontal="true"
android:layout_marginTop="32dp"
tools:ignore="HardcodedText,VisualLintBounds,VisualLintOverlap"
/> <Button
android:id="@+id/implicit_btn"
android:text="Open Website"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/explicit_btn"
android:layout_centerHorizontal="true"
android:layout_marginTop="16dp"
tools:ignore="HardcodedText" />
</RelativeLayout>

Click on implicit intent


example the google.com home
page will open in a browser.
Practical no 22
MainActivity.java
package com.example.sensorsexample;
import android.annotation.SuppressLint;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SensorManager mgr = (SensorManager)
getSystemService(Context.SENSOR_SERVICE);
@SuppressLint({"MissingInflatedId", "LocalSuppress"}) TextView txtList =
findViewById(R.id.sensorslist);
List<Sensor> sensorList = mgr.getSensorList(Sensor.TYPE_ALL);
StringBuilder strBuilder = new StringBuilder();
for (Sensor s : sensorList) {
strBuilder.append(s.getName()).append("\n"); }
txtList.setVisibility(View.VISIBLE);
txtList.setText(strBuilder);}}

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:paddingLeft="10dp"
android:paddingRight="10dp">

<TextView
android:id="@+id/sensorslist"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="80dp"
android:text="Sensors"
android:textSize="20dp"
android:textStyle="bold"
android:layout_gravity="center"
android:visibility="gone"/>
</LinearLayout>
MainActivity.java
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import java.util.List;
public class MainActivity extends AppCompatActivity implements
SensorEventListener {
private SensorManager mgr;
private Sensor sensor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mgr = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sensor = mgr.getDefaultSensor(Sensor.TYPE_LIGHT);
List<Sensor> deviceSensors = mgr.getSensorList(Sensor.TYPE_ALL);}
@Override
protected void onResume() {
super.onResume();
// Register the listener
if (sensor != null) {
mgr.registerListener(this, sensor,
SensorManager.SENSOR_DELAY_NORMAL);}}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {}
@Override
public void onSensorChanged(SensorEvent event) {
float sensorValue = event.values[0]; }}
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:paddingLeft="16dp"
android:paddingRight="16dp">

<TextView
android:id="@+id/sensorValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sensor Value:"
android:textSize="18sp"/>
</LinearLayout>

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