Android Activity example

Android Activity

• onCreate()
• onStart()
• onResume()
• onPause()
• onStop()
• onDestroy

whenever activity call in android into one screen to another screen and activity of screen A and Screen B it display Toast message.

Here we layout click event 

activity_activity.xml

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

<android.support.constraint.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"

    android:background="@color/colorPrimary"

    android:id="@+id/lay1"

    tools:context="com.example.anshu.intent_example.ActivityA">

</android.support.constraint.ConstraintLayout>

and another 

activity_b.xml

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

<android.support.constraint.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"

    android:background="@color/colorAccent"

    android:id="@+id/lay2"

    tools:context="com.example.anshu.intent_example.ActivityB">

</android.support.constraint.ConstraintLayout>

ActivityA.java

package com.example.anshu.intent_example;

import android.content.Context;

import android.content.Intent;

import android.os.PersistableBundle;

import android.support.annotation.Nullable;

import android.support.constraint.ConstraintLayout;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.Layout;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class ActivityA extends AppCompatActivity {

    ConstraintLayout lay1;

    public Context context;

   //utils ut = new utils();

   //ut.

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_activity);

        lay1 = (ConstraintLayout) findViewById(R.id.lay1);

        lay1.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                Intent i = new Intent(getApplicationContext(),ActivityB.class);

                startActivity(i);

            }

        });

        Toast.makeText(this,"A >> is Created",Toast.LENGTH_SHORT).show();

        //utils utl = new utils();

        //utl.toast("A is Created",);

        //utl.toast("A create ",);

    }

    @Override

    protected void onStart() {

        super.onStart();

        //utils utl = new utils();

        //utl.toast("A create ",this);

        Toast.makeText(this,"A >> is started",Toast.LENGTH_SHORT).show();

        //this.context = c;//Context context;

    }

    @Override

    protected void onResume() {

        super.onResume();

        Toast.makeText(this,"A >> is resume",Toast.LENGTH_SHORT).show();

    }

    @Override

    protected void onPause() {

        super.onPause();

        Toast.makeText(this,"A >> is pause",Toast.LENGTH_SHORT).show();

    }

    @Override

    protected void onStop() {

        super.onStop();

        Toast.makeText(this,"A >> is stop",Toast.LENGTH_SHORT).show();

    }

}

ActivityB.java

package com.example.anshu.intent_example;

import android.content.Context;

import android.content.Intent;

import android.support.constraint.ConstraintLayout;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Toast;

public class ActivityB extends AppCompatActivity {

    ConstraintLayout lay2;

    public Context context;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_b);

        lay2 = (ConstraintLayout) findViewById(R.id.lay2);

        lay2.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                Intent i = new Intent(getApplicationContext(),ActivityA.class);

                startActivity(i);

            }

        });

        Toast.makeText(this,"B >> is Created",Toast.LENGTH_SHORT).show();

    }

    @Override

    protected void onStart() {

        super.onStart();

        Toast.makeText(this,"B >> is Started",Toast.LENGTH_SHORT).show();

    }

    @Override

    protected void onResume() {

        super.onResume();

        Toast.makeText(this,"B >> is Resume",Toast.LENGTH_SHORT).show();

    }

    @Override

    protected void onPause() {

        super.onPause();

        Toast.makeText(this,"B >> is Pause",Toast.LENGTH_SHORT).show();

    }

    @Override

    protected void onStop() {

        super.onStop();

        Toast.makeText(this,"B >> is Stop",Toast.LENGTH_SHORT).show();

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        Toast.makeText(this,"B >> is Destroy",Toast.LENGTH_SHORT).show();

    }

}

utils.java

package com.example.anshu.intent_example;

import android.content.Context;

import android.widget.Toast;

public class utils {

   public void toast(String stringmsg, Context mcontext)

   {

       Toast.makeText(mcontext,stringmsg,Toast.LENGTH_SHORT).show();

   }

}

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