AndroidIntents

August 18, 2016August 29, 2016 androindian

3329 views.

Android Intent is the message that is passed between components such as activities, content providers, broadcast receivers, services etc.

It is generally used with startActivity() method to invoke activity, broadcast receivers etc.

The dictionary meaning of intent is intention or purpose. So, it can be described as the intention to do action.

The LabeledIntent is the subclass of android.content.Intent class.

Android intents are mainly used to:

Start the service
Launch an activity
Display a web page
Display a list of contacts
Broadcast a message
Dial a phone call etc.

There are two types of intents in android: implicit and explicit.

1) Implicit Intent

Implicit Intent doesn’t specifiy the component. In such case, intent provides information of available components provided by the system that is to be invoked.

For example, you may write the following code to view the webpage.

Intent intent=new Intent(Intent.ACTION_VIEW);  

intent.setData(Uri.parse("http://androindian.com/"));  

startActivity(intent);

Intent intent=new Intent(Intent.ACTION_VIEW);

intent.setData(Uri.parse("http://androindian.com/"));

startActivity(intent);

Program for Implicit Intent

Activity_main.xml

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="${relativePackage}.${activityClass}" >



    <TextView

        android:id="@+id/textView1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Implicit Intent Example"

        android:gravity="center"/>



    <Button

        android:id="@+id/button1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/textView1"

        android:layout_marginTop="137dp"

        android:text="Click me" />



</RelativeLayout>

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

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="${relativePackage}.${activityClass}" >

<TextView

android:id="@+id/textView1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Implicit Intent Example"

android:gravity="center"/>

<Button

android:id="@+id/button1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_below="@+id/textView1"

android:layout_marginTop="137dp"

android:text="Click me" />

</RelativeLayout>

ActivityMain.Java

package com.raj.implicitintent;



import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;



public class MainActivity extends Activity {



              @Override

              protected void onCreate(Bundle savedInstanceState) {

                             super.onCreate(savedInstanceState);

                             setContentView(R.layout.activity_main);



                             Button b=(Button) findViewById(R.id.button1);



                             b.setOnClickListener(new OnClickListener() {



                                           @Override

                                           public void onClick(View v) {

                                                          // TODO Auto-generated method stub

                                                          String url = "http://androindian.com/";

                                                          Intent i = new Intent(Intent.ACTION_VIEW);

                                                          i.setData(Uri.parse(url));

                                                          startActivity(i);



                                           }

                             });

              }

}

package com.raj.implicitintent;

import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button b=(Button) findViewById(R.id.button1);

b.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String url = "http://androindian.com/";

Intent i = new Intent(Intent.ACTION_VIEW);

i.setData(Uri.parse(url));

startActivity(i);

}

});

}

AndroidManifest.xml

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

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

    package="com.raj.implicitintent"

    android:versionCode="1"

    android:versionName="1.0" >



    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <uses-permission android:name="android.permission.INTERNET"/>



    <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>

    </application>



</manifest>

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

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

package="com.raj.implicitintent"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="21" />

<uses-permission android:name="android.permission.INTERNET"/>

<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>

</intent-filter>

</activity>

</application>

</manifest>

2) Explicit Intent

Explicit Intent specifies the component. In such case, intent provides the external class to be invoked.

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

startActivity(i);

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

startActivity(i);

To get the full code of explicit intent, visit the next page

Program for Explicit Intents

Activity _Main.xml

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="${relativePackage}.${activityClass}" >



    <TextView

        android:id="@+id/textView1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Explicit Intent Example"

        android:gravity="center" />



    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentRight="true"

        android:layout_below="@+id/textView1"

        android:layout_marginTop="88dp"

        android:text="Button" />



</RelativeLayout>

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

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="${relativePackage}.${activityClass}" >

<TextView

android:id="@+id/textView1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Explicit Intent Example"

android:gravity="center" />

<Button

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentRight="true"

android:layout_below="@+id/textView1"

android:layout_marginTop="88dp"

android:text="Button" />

</RelativeLayout>

MainActivity.Java

package com.raj.explicitintent;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;



public class MainActivity extends Activity {



              Button bt;

              @Override

              protected void onCreate(Bundle savedInstanceState) {

                             super.onCreate(savedInstanceState);

                             setContentView(R.layout.activity_main);



                             bt=(Button) findViewById(R.id.button1);



                             bt.setOnClickListener(new OnClickListener() {



                                           @Override

                                           public void onClick(View v) {

                                                          // TODO Auto-generated method stub



                                                          Intent intent=new Intent(getApplicationContext(), Second.class);

                                                         startActivity(intent);



                                           }

                             });

              }

}

package com.raj.explicitintent;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

Button bt;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

bt=(Button) findViewById(R.id.button1);

bt.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent=new Intent(getApplicationContext(), Second.class);

startActivity(intent);

}

});

}

Second_Activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Hi Mr. Raj...................Welcome to SEcond Activity" 
        android:textSize="20sp"
        android:gravity="center"/>

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

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="${relativePackage}.${activityClass}" >

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Hi Mr. Raj...................Welcome to SEcond Activity"

android:textSize="20sp"

android:gravity="center"/>

SecondActivity.java

package com.raj.explicitintent;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class Second extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_second);
	}
}

package com.raj.explicitintent;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

public class Second extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_second);

}

Android Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.raj.explicitintent"
    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=".Second"
            android:label="@string/title_activity_second" >
        </activity>
    </application>

</manifest>

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

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

package="com.raj.explicitintent"

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>

</intent-filter>

</activity>

<activity

android:name=".Second"

android:label="@string/title_activity_second" >

</activity>

</application>

</manifest>

AndroidIntents

1) Implicit Intent

2) Explicit Intent

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