How to call an activity on Button click.

Step 1:

Create a project named "CallingActivity".

Step 2:

Paste the following code in your MainActivity.java file.

package com.example.callingactivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity
{
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn=(Button) findViewById(R.id.button1);
btn.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
Intent i = new Intent();
i.setClass(getApplicationContext(), Class2.class);
startActivity(i);
}
});
}
}

Step 3:

Make another class named Class.java.

Step 4:

Paste the following code in your Class.java file.

package com.example.callingactivity;
import android.app.Activity;
import android.os.Bundle;

public class Class2 extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.class2_layout);
}

}

Step 5:

Now go to res folder and then layout folder and open the activity_main.xml file.

Step 6:

Paste the following code in activity_main.xml file.

You will have this screen.

Step 7 :

Now Go to the layout folder make xml file named class2_layout.xml .

Step 8 :

Paste the following code in your class2_layout.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:orientation="vertical" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="This is Activity Two"

        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

Step 9 :

Now go to AndroidMenifest.xml file and paste the following code.

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.callingactivity"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".Class2" >

        </activity>

    </application>

</manifest>

Step 10:

Now run your project.

This screen will be shown.

Click on button.

Now you will have this screen.

Thank you.