Using Intent Demo

January 26, 2010 7:45:04 AM PST (3 years ago). Seen 70,154 times. 10 replies.

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Serete Itebete

Member since Dec 23, 2009
Location: Oakland
Forum Posts: 17

After writing a single activity, there comes a need to transition to another activity to perform another task either with or without information from the first activity.

Android platform allows transition by means of Intent Interface.

In this example there are two activities - IntentActionDemo.java and IntentA.java that both extend the super class Activity. Do not forget to declare any new activity in the AndroidManifest.xml with permission.

I have introduced buttons in both activities which have a listener to allow an intent to transition from one intent to the other activity and vis-versa.

Simple intent example;
Note that optional step 2 was not used in our demo.
Step 1: Intent i = new Intent(context, NameOfClassToTransitionTo.class)

Step 2:(Optional)Intents can take various forms that make it even carry data in key/name pairs ie i.putExtra("key1", "My first Info")
i.putExtra("key2", "My second Info")

Step 3: startActivity(i)

IntentActionDemo.java

Code:


package com.marakana.com;

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 IntentActionDemo extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button button = (Button) findViewById(R.id.intentButton);
        button.setOnClickListener(this);
         
    }

    @Override
    public void onClick(View src) {
      Intent i = new Intent(this, IntentA.class);
      startActivity(i);
    }
}

IntentA.java

Code:


package com.marakana.com;

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 IntentA extends Activity implements OnClickListener{

    @Override
    public void onClick(View src) {
      Intent i = new Intent(this, IntentActionDemo.class);
      startActivity(i);
    }
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.intenta);
        
        Button button = (Button) findViewById(R.id.ButtonIntentA);
        button.setOnClickListener(this);
    }
}

AndroidManifest.xml

Code:


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.marakana.com"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".IntentActionDemo"
                  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="IntentA"></activity>
</application>
    <uses-sdk android:minSdkVersion="3" />

</manifest>

string.xml

Code:


<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello</string>
    <string name="app_name">IntentActionDemo</string>
<string name="IntentA">Click Next intent</string>
<string name="world">World!</string>
<string name="Intent0">Click to Previous Intent</string>
</resources>

main.xml

Code:


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    android:textSize="18sp"/>
<Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/intentButton" android:text="@string/IntentA"></Button>
</LinearLayout>

intenta.xml

Code:


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" android:orientation="vertical">

<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/TextViewWorld" android:text="@string/world" android:textSize="18sp"></TextView>
<Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ButtonIntentA" android:text="@string/Intent0"></Button>
</LinearLayout>

Screenshot

Source
http://marakana.com/static/tutorials/IntentActionDemo.zip

Edited 5 times. Last edit by Bala Krishnan on Oct 26, 2010 at 6:31:37 AM (about 2 years ago).

January 28, 2010 2:17:16 AM PST (3 years ago)

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Uzair Ali

ABC

Member since Jan 28, 2010
Forum Posts: 1

Intent i = new Intent(context, NameOfClassToTransitionTo.class);

I get an error when i use the above line:
The constructor Intent(new View.OnClickListener(){}, Class<IntentA>) is undefined ...

How to resolve this issue??

Thanks

April 26, 2010 11:08:33 PM PDT (3 years ago)

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Serete Itebete

Member since Dec 23, 2009
Location: Oakland
Forum Posts: 17

Uzair,

Make sure that the class (NameOfClassToTransitionTo.class) exists in your project. Try going to project>clean>build

See if that works. Let me know if that works

August 11, 2010 9:37:23 PM PDT (2 years ago)

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Rajesh Kumar

Svcet

Member since Aug 11, 2010
Forum Posts: 1

hi ....i am new to android development. plz send me android examples

Edited 2 times. Last edit by Rajesh Kumar on Aug 11, 2010 at 9:39:22 PM (about 2 years ago).

August 27, 2010 5:56:56 AM PDT (2 years ago)

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Sarun Khumthong

Mahidol University

Member since Aug 27, 2010
Forum Posts: 1

You have to add activity to the Manifest too.

October 26, 2010 6:31:37 AM PDT (2 years ago)

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Bala Krishnan

Android

Company

Member since Oct 24, 2010
Forum Posts: 2

I m facing error while runnning this code ask to force close

July 6, 2011 4:36:37 AM PDT (one year ago)

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Vootla Radha

Gameshastra solutions

Member since Jul 6, 2011
Forum Posts: 1

iam new to android sdk...i have one dought, wht is the main use of intent?

October 14, 2011 11:20:07 PM PDT (one year ago)

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Firzan Ghulam

Itechnologix

Member since Oct 14, 2011
Forum Posts: 1

plz send me the source code for android chat application...!!!

March 25, 2012 2:35:06 AM PDT (one year ago)

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Stefano Bizzi

BluePine Technology

Member since Mar 25, 2012
Forum Posts: 1

Serete,
This will look a bit like a useless post, but every time I need a quick way to do something I stumble upon an example written by you that does EXACTLY what I need, nothing more, nothing less :) thanks!

March 30, 2012 4:40:56 AM PDT (one year ago)

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Korada Rameshbabu

Xpio

Member since Mar 30, 2012
Forum Posts: 3

hi sir,
Please explain the use of intent.putextras(String,String);
function.
what the use

August 27, 2012 2:38:29 AM PDT (42 weeks ago)

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Narendra Kumar Vaddi

SPTCS

Member since Aug 27, 2012
Forum Posts: 1

When ever i try to pass data using intent,exceptions occurred. What i supposed to do to avoid that problem?
please send the reply sir.

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