Mobile Application Development Practical 17
Question 1
Write a program to create a HelloWorld Activity using all lifecycles methods to display messages using Log.d.
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:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Activity Life Cycle"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>MainActivity.java
package com.example.practical17;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d("Activity life cycle","onCreate called");
}
protected void onStart()
{
super.onStart();
Log.d("Activity life cycle","onStart called");
}
protected void onResume()
{
super.onResume();
Log.d("Activity life cycle","onResume called");
}
protected void onPause()
{
super.onPause();
Log.d("Activity life cycle","onPause called");
}
protected void onStop()
{
super.onStop();
Log.d("Activity life cycle","onStop called");
}
protected void onDestroy()
{
super.onDestroy();
Log.d("Activity life cycle","onDestroy called");
}
}Output
