Implicit Intents - Same Action and Category tags to apply two Activities

Demo:

1.ImplicitIntentsDemo1 Activity:

package com.venkool;

import android.app.Activity;

public class ImplicitIntentsDemo1Activity extends Activity {

      /** Called when the activity is first created. */

      @Override

      public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.first);

            Button btnSecond = (Button) findViewById(R.id.btnSecond);

            btnSecond.setOnClickListener(new OnClickListener() {

                  @Override

                  public void onClick(View v) {

                        // TODO Auto-generated method stub

                        Intent intent = new Intent();

                        intent.setAction("action2");

                        intent.addCategory("category2");

                        startActivity(intent);

                  }

            });

            Button btnThird = (Button) findViewById(R.id.btnThird);

            btnThird.setOnClickListener(new OnClickListener() {

                  @Override

                  public void onClick(View v) {

                        // TODO Auto-generated method stub

                        Intent intent = new Intent();

                        intent.setAction("action2");

                        intent.setAction("action3");

                        intent.addCategory("category2");

                        intent.addCategory("category2");

                        startActivity(intent);

                  }

            });

      }

}

2.SecondScreen Activity:

package com.venkool;

import android.app.Activity;

public class SecondScreen extends Activity {

      /** Called when the activity is first created. */

      @Override

      public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.second);

      }

}

3.Third Screen Activity:

package com.venkool;

import android.app.Activity;

public class ThirdScreen extends Activity {

      /** Called when the activity is first created. */

      @Override

      public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.third);

      }

}

4.first.xml:

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@color/FirstBackground"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="20dp"

        android:gravity="center"

        android:text="Implicit Intents Demo"

        android:textSize="20dp"

        android:textStyle="bold" />

    <Button

        android:id="@+id/btnSecond"

        android:layout_width="150dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="30dp"

        android:gravity="center"

        android:text="Second" />

    <Button

        android:id="@+id/btnThird"

        android:layout_width="150dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="30dp"

        android:gravity="center"

        android:text="Third" />

</LinearLayout>

5.second.xml:

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@color/SecondBackground"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="70dp"

        android:gravity="center"

        android:text="Second Screen"

        android:textSize="30dp"

        android:textStyle="bold" />

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="20dp"

        android:gravity="center"

        android:text="Implicit Intents"

        android:textSize="20dp"

        android:textStyle="bold" />

</LinearLayout>

6.third.xml:

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@color/ThirdBackground"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="70dp"

        android:gravity="center"

        android:text="Third Screen"

        android:textSize="30dp"

        android:textStyle="bold" />

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="20dp"

        android:gravity="center"

        android:text="Implicit Intents"

        android:textSize="20dp"

        android:textStyle="bold" />

</LinearLayout>

7.Colors adding Strings.xml:

    <color name="FirstBackground">#556B2F</color>

    <color name="SecondBackground">#9932CC</color>

    <color name="ThirdBackground">#4B0082</color>

8.Add activity to manifest file:

<activity

            android:label="Second Screen"

            android:name=".SecondScreen" >

            <intent-filter >

                <action android:name="action2" />

                <action android:name="action3" />

                <category android:name="category2" />

                <category android:name="category3" />

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

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

            </intent-filter>

        </activity>

        <activity

            android:label="Third Screen"

            android:name=".ThirdScreen" >

            <intent-filter >

                <action android:name="action2" />

                <action android:name="action3" />

                <category android:name="category2" />

                <category android:name="category3" />

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

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

            </intent-filter>

</activity>